rule IronTiger_PlugX_FastProxy
{
	meta:
		author = "Cyber Safety Solutions, Trend Micro"
		description = "Iron Tiger Malware - PlugX FastProxy"
		reference = "http://goo.gl/T5fSJC"
		id = "14e05823-6288-5f02-8060-add51084c446"
	strings:
		$str1 = "SAFEPROXY HTServerTimer Quit!" wide ascii
		$str2 = "Useage: %s pid" wide ascii
		$str3 = "%s PORT[%d] TO PORT[%d] SUCCESS!" wide ascii
		$str4 = "p0: port for listener" wide ascii
		$str5 = "\\users\\whg\\desktop\\plug\\" wide ascii
		$str6 = "[+Y] cwnd : %3d, fligth:" wide ascii
	condition:
		uint16(0) == 0x5a4d and (any of ($str*))
}

rule IronTiger_PlugX_Server
{
	meta:
		author = "Cyber Safety Solutions, Trend Micro"
		description = "Iron Tiger Malware - PlugX Server"
		reference = "http://goo.gl/T5fSJC"
		id = "38011a23-3ed7-5f58-a814-2551526b27f3"
	strings:
		$str1 = "\\UnitFrmManagerKeyLog.pas" wide ascii
		$str2 = "\\UnitFrmManagerRegister.pas" wide ascii
		$str3 = "Input Name..." wide ascii
		$str4 = "New Value#" wide ascii
		$str5 = "TThreadRControl.Execute SEH!!!" wide ascii
		$str6 = "\\UnitFrmRControl.pas" wide ascii
		$str7 = "OnSocket(event is error)!" wide ascii
		$str8 = "Make 3F Version Ok!!!" wide ascii
		$str9 = "PELEASE DO NOT CHANGE THE DOCAMENT" wide ascii
		$str10 = "Press [Ok] Continue Run, Press [Cancel] Exit" wide ascii
	condition:
		uint16(0) == 0x5a4d and (2 of ($str*))
}

rule APT_Area1_SSF_PlugX {
   meta:
      description = "Detects send tool used in phishing campaign reported by Area 1 in December 2018"
      reference = "https://cdn.area1security.com/reports/Area-1-Security-PhishingDiplomacy.pdf"
      date = "2018-12-19"
      author = "Area 1"
      id = "a5b4e781-f0d1-55df-926c-2d321aa48139"
   strings:
      $feature_call = { 8b 0? 56 68 ?? ?? ?? ?? 68 ?? ?? ?? ?? 68 ?? ?? ?? ??
         6a 07 6a ff ff d0 8b f0 85 f6 74 14 }
      $keylogger_reg = { 8b 4d 08 6a 0c 6a 01 8d 55 f4 52 c7 45 f4 01 00 06 00
         c7 45 f8 00 01 00 00 89 4d fc ff d0 85 c0 75 1d }
      $file_op = { 55 8b ec 83 ec 20 0f b7 56 18 8b 46 10 66 8b 4e 14 89 45 e4
         8d 44 32 10 66 89 4d f0 0f b7 4e 1a 57 89 45 e8 33 ff 8d 45 e0 8d 54
         31 10 50 89 7d e0 89 55 ec c7 45 fa ?? ?? ?? ?? 89 7d f2 89 7d f6 ff
         15 1c 43 02 10 }
      $ver_cmp = { 0f b6 8d b0 fe ff ff 0f b6 95 b4 fe ff ff 66 c1 e1 08 0f b7
         c1 0b c2 3d 02 05 00 00 7f 2c }
      $regedit = { c7 06 23 01 12 20 c7 46 04 01 90 00 00 89 5e 0c 89 5e 08 e8
         51 fb ff ff 8b 4d 08 8b 50 38 68 30 75 00 00 56 51 ff d2 }
      $get_device_caps = { 8b 1d ?? ?? ?? ?? 6a 08 50 ff d3 0f b7 56 12 8b c8 0f af ca
         b8 1f 85 eb 51 f7 e9 c1 fa 05 8b c2 c1 e8 1f 03 c2 89 45 f8 8b 45 f0 6a 0a 50 ff d3
         0f b7 56 14 8b c8 0f af ca b8 1f 85 eb 51 }
   condition:
      3 of them
}

rule Codoso_PlugX_3 {
	meta:
		description = "Detects Codoso APT PlugX Malware"
		license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"
		author = "Florian Roth (Nextron Systems)"
		reference = "https://www.proofpoint.com/us/exploring-bergard-old-malware-new-tricks"
		date = "2016-01-30"
		hash = "74e1e83ac69e45a3bee78ac2fac00f9e897f281ea75ed179737e9b6fe39971e3"
		id = "55066812-3a8e-5099-afb4-ff7a59f1ccb2"
	strings:
		$s1 = "Cannot create folder %sDCRC failed in the encrypted file %s. Corrupt file or wrong password." fullword wide
		$s2 = "mcs.exe" fullword ascii
		$s3 = "McAltLib.dll" fullword ascii
		$s4 = "WinRAR self-extracting archive" fullword wide
	condition:
		uint16(0) == 0x5a4d and filesize < 1200KB and all of them
}

rule Codoso_PlugX_2 {
	meta:
		description = "Detects Codoso APT PlugX Malware"
		license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"
		author = "Florian Roth (Nextron Systems)"
		reference = "https://www.proofpoint.com/us/exploring-bergard-old-malware-new-tricks"
		date = "2016-01-30"
		hash = "b9510e4484fa7e3034228337768176fce822162ad819539c6ca3631deac043eb"
		id = "0402a0ff-5664-52db-a739-51c5181853f8"
	strings:
		$s1 = "%TEMP%\\HID" fullword wide
		$s2 = "%s\\hid.dll" fullword wide
		$s3 = "%s\\SOUNDMAN.exe" fullword wide
		$s4 = "\"%s\\SOUNDMAN.exe\" %d %d" fullword wide
		$s5 = "%s\\HID.dllx" fullword wide
	condition:
		( uint16(0) == 0x5a4d and filesize < 400KB and 3 of them ) or all of them
}

rule Codoso_PGV_PVID_4 {
	meta:
		description = "Detects Codoso APT PlugX Malware"
		license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"
		author = "Florian Roth (Nextron Systems)"
		reference = "https://www.proofpoint.com/us/exploring-bergard-old-malware-new-tricks"
		date = "2016-01-30"
		super_rule = 1
		hash1 = "13bce64b3b5bdfd24dc6f786b5bee08082ea736be6536ef54f9c908fd1d00f75"
		hash2 = "8a56b476d792983aea0199ee3226f0d04792b70a1c1f05f399cb6e4ce8a38761"
		hash3 = "b2950f2e09f5356e985c38b284ea52175d21feee12e582d674c0da2233b1feb1"
		hash4 = "b631553421aa17171cc47248adc110ca2e79eff44b5e5b0234d69b30cab104e3"
		hash5 = "bc0b885cddf80755c67072c8b5961f7f0adcaeb67a1a5c6b3475614fd51696fe"
		id = "c1c753a6-77b6-5bfb-89f9-16127c264fd0"
	strings:
		$x1 = "dropper, Version 1.0" fullword wide
		$x2 = "dropper" fullword wide
		$x3 = "DROPPER" fullword wide
		$x4 = "About dropper" fullword wide

		$s1 = "Microsoft Windows Manager Utility" fullword wide
		$s2 = "SYSTEM\\CurrentControlSet\\Services\\" ascii /* Goodware String - occured 9 times */
		$s3 = "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon\\Notify" fullword ascii /* Goodware String - occured 10 times */
		$s4 = "<assembly xmlns=\"urn:schemas-microsoft-com:asm.v1\" manifestVersion=\"1.0\"><trustInfo xmlns=\"urn:schemas-microsoft-com:asm.v3" ascii /* Goodware String - occured 46 times */
		$s5 = "<supportedOS Id=\"{e2011457-1546-43c5-a5fe-008deee3d3f0}\"></supportedOS>" fullword ascii /* Goodware String - occured 65 times */
	condition:
		uint16(0) == 0x5a4d and filesize < 900KB and 2 of ($x*) and 2 of ($s*)
}

rule Codoso_PlugX_1 {
	meta:
		description = "Detects Codoso APT PlugX Malware"
		license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"
		author = "Florian Roth (Nextron Systems)"
		reference = "https://www.proofpoint.com/us/exploring-bergard-old-malware-new-tricks"
		date = "2016-01-30"
		super_rule = 1
		hash1 = "0b8cbc9b4761ab35acce2aa12ba2c0a283afd596b565705514fd802c8b1e144b"
		hash2 = "448711bd3f689ceebb736d25253233ac244d48cb766834b8f974c2e9d4b462e8"
		hash3 = "fd22547497ce52049083092429eeff0599d0b11fe61186e91c91e1f76b518fe2"
		id = "af777818-5cff-5571-b5e9-0f5a4c8b08ff"
	strings:
		$s1 = "GETPASSWORD1" fullword ascii
		$s2 = "NvSmartMax.dll" fullword ascii
		$s3 = "LICENSEDLG" fullword ascii
	condition:
		uint16(0) == 0x5a4d and filesize < 800KB and all of them
}

rule Dropper_DeploysMalwareViaSideLoading {
    meta:
        description = "Detects a dropper used to deploy an implant via side loading. This dropper has specifically been observed deploying REDLEAVES & PlugX"
        author = "USG"
        reference = "https://www.us-cert.gov/ncas/alerts/TA17-117A"
        true_positive = "5262cb9791df50fafcb2fbd5f93226050b51efe400c2924eecba97b7ce437481: drops REDLEAVES. 6392e0701a77ea25354b1f40f5b867a35c0142abde785a66b83c9c8d2c14c0c3: drops plugx. "
        id = "2e7cdedd-2358-5d71-a3ec-73dec442d840"
    strings:
        $UniqueString = {2e 6c 6e 6b [0-14] 61 76 70 75 69 2e 65 78 65} // ".lnk" near "avpui.exe"
        $PsuedoRandomStringGenerator = {b9 1a [0-6] f7 f9 46 80 c2 41 88 54 35 8b 83 fe 64} // Unique function that generates a 100 character pseudo random string.
    condition:
        any of them
}

rule PLUGX_RedLeaves {
    meta:
        author = "US-CERT Code Analysis Team"
        date = "03.04.2017"
        reference = "https://www.us-cert.gov/ncas/alerts/TA17-117A"
        incident = "10118538"
        date = "2017-04-03"
        MD5_1 = "598FF82EA4FB52717ACAFB227C83D474"
        MD5_2 = "7D10708A518B26CC8C3CBFBAA224E032"
        MD5_3 = "AF406D35C77B1E0DF17F839E36BCE630"
        MD5_4 = "6EB9E889B091A5647F6095DCD4DE7C83"
        MD5_5 = "566291B277534B63EAFC938CDAAB8A399E41AF7D"
        description = "Detects specific RedLeaves and PlugX binaries"
        id = "ede8ad8f-31cf-5314-9777-bddd60e499f2"
    strings:
        $s0 = { 80343057403D2FD0010072F433C08BFF80343024403D2FD0010072F4 }
        $s1 = "C:\\Users\\user\\Desktop\\my_OK_2014\\bit9\\runsna\\Release\\runsna.pdb"
        $s2 = "d:\\work\\plug4.0(shellcode)"
        $s3 = "\\shellcode\\shellcode\\XSetting.h"
        $s4 = { 42AFF4276A45AA58474D4C4BE03D5B395566BEBCBDEDE9972872C5C4C5498228 }
        $s5 = { 8AD32AD002D180C23830140E413BCB7CEF6A006A006A00566A006A00 }
        $s6 = { EB055F8BC7EB05E8F6FFFFFF558BEC81ECC8040000535657 }
        $s7 = { 8A043233C932043983C10288043283F90A7CF242890D18AA00103BD37CE2891514AA00106A006A006A0056 }
        $s8 = { 293537675A402A333557B05E04D09CB05EB3ADA4A4A40ED0B7DAB7935F5B5B08 }
        $s9 = "RedLeavesCMDSimulatorMutex"
    condition:
        $s0 or $s1 or $s2 and $s3 or $s4 or $s5 or $s6 or $s7 or $s8 or $s9
}

rule PlugX_J16_Gen {
	meta:
		description = "Detects PlugX Malware samples from June 2016"
		license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"
		author = "Florian Roth (Nextron Systems)"
		reference = "VT Research"
		date = "2016-06-08"
		id = "13ef1e80-7090-5a1e-bca7-8d3de0dc2247"
	strings:
		$x1 = "%WINDIR%\\SYSTEM32\\SERVICES.EXE" fullword wide
		$x2 = "\\\\.\\PIPE\\RUN_AS_USER(%d)" fullword wide
		$x3 = "LdrLoadShellcode" fullword ascii
		$x4 = "Protocol:[%4s], Host: [%s:%d], Proxy: [%d:%s:%d:%s:%s]" fullword ascii

		$s1 = "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Internet Settings\\User Agent\\Post Platform" fullword wide
		$s2 = "%s\\msiexec.exe %d %d" fullword wide
		$s3 = "l%s\\sysprep\\CRYPTBASE.DLL" fullword wide
		$s4 = "%s\\msiexec.exe UAC" fullword wide
		$s5 = "CRYPTBASE.DLL" fullword wide
		$s6 = "%ALLUSERSPROFILE%\\SxS" fullword wide
		$s7 = "%s\\sysprep\\sysprep.exe" fullword wide
		$s8 = "\\\\.\\pipe\\a%d" fullword wide
		$s9 = "\\\\.\\pipe\\b%d" fullword wide
		$s10 = "EName:%s,EAddr:0x%p,ECode:0x%p,EAX:%p,EBX:%p,ECX:%p,EDX:%p,ESI:%p,EDI:%p,EBP:%p,ESP:%p,EIP:%p" fullword ascii
		$s11 = "Mozilla/4.0 (compatible; MSIE " fullword wide
		$s12 = "; Windows NT %d.%d" fullword wide
		$s13 = "SOFTWARE\\Microsoft\\Internet Explorer\\Version Vector" fullword wide
		$s14 = "\\bug.log" wide
	condition:
		( uint16(0) == 0x5a4d and filesize < 600KB and ( 1 of ($x*) or 4 of ($s*) ) ) or ( 8 of them )
}

rule PlugX_J16_Gen2 {
	meta:
		description = "Detects PlugX Malware Samples from June 2016"
		license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"
		author = "Florian Roth (Nextron Systems)"
		reference = "VT Research"
		date = "2016-06-08"
		id = "28e9cbb9-cd60-555d-b033-4e2bf293adf2"
	strings:
		$s1 = "XPlugKeyLogger.cpp" fullword ascii
		$s2 = "XPlugProcess.cpp" fullword ascii
		$s4 = "XPlgLoader.cpp" fullword ascii
		$s5 = "XPlugPortMap.cpp" fullword ascii
		$s8 = "XPlugShell.cpp" fullword ascii
		$s11 = "file: %s, line: %d, error: [%d]%s" fullword ascii
		$s12 = "XInstall.cpp" fullword ascii
		$s13 = "XPlugTelnet.cpp" fullword ascii
		$s14 = "XInstallUAC.cpp" fullword ascii
	condition:
		( uint16(0) == 0x5a4d and filesize < 600KB and ( 2 of ($s*) ) ) or ( 5 of them )
}

rule ChinaChopper_Generic {
	meta:
		description = "China Chopper Webshells - PHP and ASPX"
		license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"
		author = "Florian Roth (Nextron Systems)"
		reference = "https://www.fireeye.com/content/dam/legacy/resources/pdfs/fireeye-china-chopper-report.pdf"
		date = "2015/03/10"
		modified = "2022-10-27"
		id = "2473cef1-88cf-5b76-a87a-2978e6780b4f"
	strings:
		$x_aspx = /%@\sPage\sLanguage=.Jscript.%><%eval\(Request\.Item\[.{,100}unsafe/
		$x_php = /<?php.\@eval\(\$_POST./

		$fp1 = "GET /"
		$fp2 = "POST /"
	condition:
		filesize < 300KB and 1 of ($x*) and not 1 of ($fp*)
}

rule PAExec {
   meta:
      description = "Detects remote access tool PAEXec (like PsExec) - file PAExec.exe"
      author = "Florian Roth (Nextron Systems)"
      reference = "http://researchcenter.paloaltonetworks.com/2017/03/unit42-shamoon-2-delivering-disttrack/"
      date = "2017-03-27"
      score = 40
      hash1 = "01a461ad68d11b5b5096f45eb54df9ba62c5af413fa9eb544eacb598373a26bc"
      id = "ee564534-b921-5639-a7ed-5da79d6bf86a"
   strings:
      $x1 = "Ex: -rlo C:\\Temp\\PAExec.log" fullword ascii
      $x2 = "Can't enumProcesses - Failed to get token for Local System." fullword wide
      $x3 = "PAExec %s - Execute Programs Remotely" fullword wide
      $x4 = "\\\\%s\\pipe\\PAExecIn%s%u" fullword wide
      $x5 = "\\\\.\\pipe\\PAExecIn%s%u" fullword wide
      $x6 = "%%SystemRoot%%\\%s.exe" fullword wide
      $x7 = "in replacement for PsExec, so the command-line usage is identical, with " fullword ascii
      $x8 = "\\\\%s\\ADMIN$\\PAExec_Move%u.dat" fullword wide
   condition:
      (uint16(0) == 0x5a4d and filesize < 600KB and 1 of ($x*)) or (3 of them)
}

rule APT_Cloaked_PsExec
	{
	meta:
		description = "Looks like a cloaked PsExec. This may be APT group activity."
		date = "2014-07-18"
		license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"
		author = "Florian Roth (Nextron Systems)"
		score = 60
		id = "e389bb76-0d1d-5e0e-9f79-a3117c919da3"
	strings:
		$s0 = "psexesvc.exe" wide fullword
		$s1 = "Sysinternals PsExec" wide fullword
	condition:
		uint16(0) == 0x5a4d and $s0 and $s1
		and not filename matches /(psexec.exe|PSEXESVC.EXE|PsExec64.exe)$/is
		and not filepath matches /RECYCLE.BIN\\S-1/
}

rule PAExec_Cloaked {
   meta:
      description = "Detects a renamed remote access tool PAEXec (like PsExec)"
      author = "Florian Roth (Nextron Systems)"
      reference = "http://researchcenter.paloaltonetworks.com/2017/03/unit42-shamoon-2-delivering-disttrack/"
      date = "2017-03-27"
      score = 70
      hash1 = "01a461ad68d11b5b5096f45eb54df9ba62c5af413fa9eb544eacb598373a26bc"
      id = "fad8417b-bbdb-5a4e-8324-660e27cb39f8"
   strings:
      $x1 = "Ex: -rlo C:\\Temp\\PAExec.log" fullword ascii
      $x2 = "Can't enumProcesses - Failed to get token for Local System." fullword wide
      $x3 = "PAExec %s - Execute Programs Remotely" fullword wide
      $x4 = "\\\\%s\\pipe\\PAExecIn%s%u" fullword wide
      $x5 = "\\\\.\\pipe\\PAExecIn%s%u" fullword wide
      $x6 = "%%SystemRoot%%\\%s.exe" fullword wide
      $x7 = "in replacement for PsExec, so the command-line usage is identical, with " fullword ascii
      $x8 = "\\\\%s\\ADMIN$\\PAExec_Move%u.dat" fullword wide
   condition:
      ( uint16(0) == 0x5a4d and filesize < 600KB and 1 of ($x*) )
      and not filename == "paexec.exe"
      and not filename == "PAExec.exe"
      and not filename == "PAEXEC.EXE"
      and not filename matches /Install/
      and not filename matches /uninstall/
}

rule Impacket_Tools_psexec {
   meta:
      description = "Compiled Impacket Tools"
      license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"
      author = "Florian Roth (Nextron Systems)"
      reference = "https://github.com/maaaaz/impacket-examples-windows"
      date = "2017-04-07"
      hash1 = "27bb10569a872367ba1cfca3cf1c9b428422c82af7ab4c2728f501406461c364"
      id = "5e8d0964-7e6a-5ff6-b9db-e37f997c3e05"
   strings:
      $s1 = "impacket.examples.serviceinstall(" ascii
      $s2 = "spsexec" fullword ascii
      $s3 = "impacket.examples.remcomsvc(" ascii
   condition:
      ( uint16(0) == 0x5a4d and filesize < 17000KB and 2 of them )
}

rule Empire_Invoke_PsExec {
   meta:
      description = "Detects Empire component - file Invoke-PsExec.ps1"
      license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"
      author = "Florian Roth (Nextron Systems)"
      reference = "https://github.com/adaptivethreat/Empire"
      date = "2016-11-05"
      hash1 = "0218be4323959fc6379489a6a5e030bb9f1de672326e5e5b8844ab5cedfdcf88"
      id = "19aaec3e-3e8f-5d7d-9c70-a212756c0300"
   strings:
      $s1 = "Invoke-PsExecCmd" fullword ascii
      $s2 = "\"[*] Executing service .EXE" fullword ascii
      $s3 = "$cmd = \"%COMSPEC% /C echo $Command ^> %systemroot%\\Temp\\" ascii
   condition:
      ( uint16(0) == 0x7566 and filesize < 50KB and 1 of them ) or all of them
}

rule Batch_Script_To_Run_PsExec {
   meta:
      author = "NCSC"
      description = "Detects malicious batch file from NCSC report"
      reference = "https://www.ncsc.gov.uk/alerts/hostile-state-actors-compromising-uk-organisations-focus-engineering-and-industrial-control"
      date = "2018/04/06"
      hash = "b7d7c4bc8f9fd0e461425747122a431f93062358ed36ce281147998575ee1a18"
      id = "1fbeeec8-a5bd-569e-b435-c7d82d32e47b"
   strings:
      $ = "Tokens=1 delims=" ascii
      $ = "SET ws=%1" ascii
      $ = "Checking %ws%" ascii
      $ = "%TEMP%\\%ws%ns.txt" ascii
      $ = "ps.exe -accepteula" ascii
   condition:
      3 of them
}

rule Casper_SystemInformation_Output {
	meta:
		description = "Casper French Espionage Malware - System Info Output - http://goo.gl/VRJNLo"
		license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"
		author = "Florian Roth (Nextron Systems)"
		reference = "http://goo.gl/VRJNLo"
		date = "2015/03/06"
		score = 70
		id = "aaae200c-7ef1-52eb-be5b-36e0ad29ecef"
	strings:
		$a0 = "***** SYSTEM INFORMATION ******"
		$a1 = "***** SECURITY INFORMATION ******"
		$a2 = "Antivirus: "
		$a3 = "Firewall: "
		$a4 = "***** EXECUTION CONTEXT ******"
		$a5 = "Identity: "
		$a6 = "<CONFIG TIMESTAMP="
	condition:
		all of them
}

rule Certutil_Decode_OR_Download {
   meta:
      description = "Certutil Decode"
      license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"
      author = "Florian Roth (Nextron Systems)"
      reference = "Internal Research"
      score = 40
      date = "2017-08-29"
      modified = "2026-04-01"
      id = "63bdefd2-225a-56d5-b615-5e236c97f050"
   strings:
      $a1 = "certutil -decode " ascii wide
      $a2 = "certutil  -decode " ascii wide
      $a3 = "certutil.exe -decode " ascii wide
      $a4 = "certutil.exe  -decode " ascii wide
      $a5 = "certutil -urlcache -split -f http" ascii wide
      $a6 = "certutil.exe -urlcache -split -f http" ascii wide

      $fp_msi = { 52 00 6F 00 6F 00 74 00 20 00 45 00 6E 00 74 00 72 00 79 }
      $fp_doc = "https://docs.aws.amazon.com" ascii
   condition:
      filesize < 700KB
      and 1 of ($a*)
      and not 1 of ($fp*)
}

rule APT_Cloaked_CERTUTIL {
   meta:
      description = "Detects a renamed certutil.exe utility that is often used to decode encoded payloads"
      author = "Florian Roth (Nextron Systems)"
      reference = "Internal Research"
      date = "2018-09-14"
      modified = "2022-06-27"
      id = "13943cda-6bb1-5c6c-8e55-e8d4bba1ffef"
   strings:
      $s1 = "-------- CERT_CHAIN_CONTEXT --------" fullword ascii
      $s5 = "certutil.pdb" fullword ascii
      $s3 = "Password Token" fullword ascii
   condition:
      uint16(0) == 0x5a4d and all of them
      and not filename contains "certutil"
      and not filename contains "CertUtil"
      and not filename contains "Certutil"
      and not filepath contains "\\Bromium\\"
}

rule Binary_Drop_Certutil {
	meta:
		description = "Drop binary as base64 encoded cert trick"
		license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"
		author = "Florian Roth (Nextron Systems)"
		reference = "https://goo.gl/9DNn8q"
		date = "2015-07-15"
		score = 70
		id = "19791e51-d041-524d-80fa-9f3ec54eb084"
	strings:
		$s0 = "echo -----BEGIN CERTIFICATE----- >" ascii
		$s1 = "echo -----END CERTIFICATE----- >>" ascii
		$s2 = "certutil -decode " ascii
	condition:
		filesize < 10KB and all of them
}

rule Lazagne_PW_Dumper {
   meta:
      description = "Detects Lazagne PW Dumper"
      author = "Markus Neis / Florian Roth"
      reference = "https://github.com/AlessandroZ/LaZagne/releases/"
      date = "2018-03-22"
      score = 70
      id = "1904029e-9336-5278-ae2e-4bc853316600"
   strings:
      $s1 = "Crypto.Hash" fullword ascii
      $s2 = "laZagne" fullword ascii
      $s3 = "impacket.winregistry" fullword ascii
   condition:
      3 of them
}

rule HKTL_Lazagne_PasswordDumper_Dec18_1 {
   meta:
      description = "Detects password dumper Lazagne often used by middle eastern threat groups"
      author = "Florian Roth (Nextron Systems)"
      license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"
      reference = "https://www.symantec.com/blogs/threat-intelligence/seedworm-espionage-group"
      date = "2018-12-11"
      score = 85
      hash1 = "1205f5845035e3ee30f5a1ced5500d8345246ef4900bcb4ba67ef72c0f79966c"
      hash2 = "884e991d2066163e02472ea82d89b64e252537b28c58ad57d9d648b969de6a63"
      hash3 = "bf8f30031769aa880cdbe22bc0be32691d9f7913af75a5b68f8426d4f0c7be50"
      id = "bae48a4d-33b6-55b9-abf5-daf87e5da9e9"
   strings:
      $s1 = "softwares.opera(" ascii
      $s2 = "softwares.mozilla(" ascii
      $s3 = "config.dico(" ascii
      $s4 = "softwares.chrome(" ascii
      $s5 = "softwares.outlook(" ascii
   condition:
      uint16(0) == 0x5a4d and filesize < 17000KB and 1 of them
}

rule HKTL_Lazagne_Gen_18 {
   meta:
      description = "Detects Lazagne password extractor hacktool"
      author = "Florian Roth (Nextron Systems)"
      reference = "https://github.com/AlessandroZ/LaZagne"
      license = "https://creativecommons.org/licenses/by-nc/4.0/"
      date = "2018-12-11"
      score = 80
      hash1 = "51121dd5fbdfe8db7d3a5311e3e9c904d644ff7221b60284c03347938577eecf"
      id = "034ea6d8-f5cf-5664-9ff9-24d19403093d"
   strings:
      $x1 = "lazagne.config.powershell_execute(" ascii
      $x2 = "creddump7.win32." ascii
      $x3 = "lazagne.softwares.windows.hashdump" ascii
      $x4 = ".softwares.memory.libkeepass.common(" ascii
   condition:
      2 of them
}

rule APT_CN_MAL_RedDelta_Shellcode_Loader_Oct20_1 {
   meta:
      description = "Detects Red Delta samples"
      author = "Florian Roth (Nextron Systems)"
      reference = "https://twitter.com/JAMESWT_MHT/status/1316387482708119556"
      date = "2020-10-14"
      hash1 = "30b2bbce0ca4cb066721c94a64e2c37b7825dd72fc19c20eb0ab156bea0f8efc"
      hash2 = "42ed73b1d5cc49e09136ec05befabe0860002c97eb94e9bad145e4ea5b8be2e2"
      hash3 = "480a8c883006232361c5812af85de9799b1182f1b52145ccfced4fa21b6daafa"
      hash4 = "7ea7c6406c5a80d3c15511c4d97ec1e45813e9c58431f386710d0486c4898b98"
      id = "47417488-e843-5346-9baa-fcce30b884d1"
   strings:
      $x1 = "InjectShellCode" ascii fullword

      $s1 = "DotNetLoader.exe" wide ascii fullword
      $s2 = "clipboardinject" ascii fullword
      $s3 = "download.php?raw=1" wide
      $s4 = "Windows NT\\CurrentVersion\\AppCompatFlags\\TelemetryController\\Levint" wide
      $s5 = "FlashUpdate.exe" wide
      $s6 = "raw_cc_url" ascii fullword

      $op1 = { 48 8b 4c 24 78 48 89 01 e9 1a ff ff ff 48 8b 44 }
      $op2 = { ff ff 00 00 77 2a 8b 44 24 38 8b 8c 24 98 }
   condition:
      uint16(0) == 0x5a4d and
      filesize < 200KB and
      $x1 or 3 of them
}

rule APT_CN_MAL_RedDelta_Shellcode_Loader_Oct20_2 {
   meta:
      description = "Detects Red Delta samples"
      author = "Florian Roth (Nextron Systems)"
      reference = "https://twitter.com/JAMESWT_MHT/status/1316387482708119556"
      date = "2020-10-14"
      hash1 = "260ebbf392498d00d767a5c5ba695e1a124057c1c01fff2ae76db7853fe4255b"
      hash2 = "9ccb4ed133be5c9c554027347ad8b722f0b4c3f14bfd947edfe75a015bf085e5"
      hash3 = "b3fd750484fca838813e814db7d6491fea36abe889787fb7cf3fb29d9d9f5429"
      id = "acb1024a-64af-51ac-84c8-7fe9a5bd4538"
   strings:
      $x1 = "\\CLRLoader.exe" wide fullword
      $x2 = "/callback.php?token=%s&computername=%s&username=%s" ascii fullword

      $s1 = "DotNetLoader.Program" wide fullword
      $s2 = "/download.php?api=40" ascii fullword
      $s3 = "get %d URLDir" ascii fullword
      $s4 = "Read code failed" ascii fullword
      $s5 = "OpenFile fail!" wide fullword
      $s6 = "Writefile success" wide fullword

      $op1 = { 4c 8d 45 e0 49 8b cc 41 8d 51 c3 e8 34 77 02 00 }
   condition:
      uint16(0) == 0x5a4d and
      filesize < 3000KB and
      1 of ($x*) or 4 of them
}

rule APT_CN_MAL_RedDelta_Shellcode_Loader_Oct20_3 {
   meta:
      description = "Detects Red Delta samples"
      author = "Florian Roth (Nextron Systems)"
      reference = "https://twitter.com/JAMESWT_MHT/status/1316387482708119556"
      date = "2020-10-14"
      modified = "2022-12-21"
      hash1 = "740992d40b84b10aa9640214a4a490e989ea7b869cea27dbbdef544bb33b1048"
      id = "b52836bb-cdef-5416-a8e1-72d0b2298546"
   strings:
      $s1 = "Taskschd.dll" ascii fullword
      $s2 = "AddTaskPlanDllVerson.dll" ascii fullword
      $s3 = "\\FlashUpdate.exe" ascii
      $s4 = "D:\\Project\\FBIRedTeam" ascii fullword
      $s5 = "Error %s:%d, ErrorCode: %x" ascii fullword
   condition:
      uint16(0) == 0x5a4d and
      filesize < 400KB and
      4 of them
}