WindowsShell_Gen2

Description

Detects simple Windows shell - from files s3.exe, s4.exe

Query · yara

strings:
		$s1 = "cmd                  - execute cmd.exe" fullword ascii
		$s2 = "get <remote> <local> - download file" fullword ascii
		$s3 = "REMOTE: CreateFile(\"%s\")" fullword ascii
		$s4 = "put <local> <remote> - upload file" fullword ascii
		$s5 = "term                 - terminate remote client" fullword ascii
		$s6 = "[ uploading \"%s\" to \"%s\"" fullword ascii
		$s7 = "[ error : received %i bytes" fullword ascii
	condition:
		( uint16(0) == 0x5a4d and filesize < 175KB and 2 of them ) or ( 5 of them )
Raw source WindowsShell_Gen2 · YARA
Esc
Published by Neo23x0/signature-base ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
rule WindowsShell_Gen2 {
	meta:
		description = "Detects simple Windows shell - from files s3.exe, s4.exe"
		license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"
		author = "Florian Roth (Nextron Systems)"
		reference = "https://github.com/odzhan/shells/"
		date = "2016-03-26"
		super_rule = 1
		hash1 = "344575a58db288c9b5dacc654abc36d38db2e645acff05e894ff51183c61357d"
		hash2 = "f00a1af494067b275407c449b11dfcf5cb9b59a6fac685ebd3f0eb193337e1d6"
		id = "8ed8443d-491b-5cb0-b12b-0d25267ba462"
	strings:
		$s1 = "cmd                  - execute cmd.exe" fullword ascii
		$s2 = "get <remote> <local> - download file" fullword ascii
		$s3 = "REMOTE: CreateFile(\"%s\")" fullword ascii
		$s4 = "put <local> <remote> - upload file" fullword ascii
		$s5 = "term                 - terminate remote client" fullword ascii
		$s6 = "[ uploading \"%s\" to \"%s\"" fullword ascii
		$s7 = "[ error : received %i bytes" fullword ascii
	condition:
		( uint16(0) == 0x5a4d and filesize < 175KB and 2 of them ) or ( 5 of them )
}

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