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106 lines
3.3 KiB
Plaintext
106 lines
3.3 KiB
Plaintext
/*
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Yara Rule Set
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Author: Florian Roth
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Date: 2016-12-29
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Identifier: GRIZZLY STEPPE
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*/
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/* Rule Set ----------------------------------------------------------------- */
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rule GRIZZLY_STEPPE_Malware_1 {
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meta:
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description = "Auto-generated rule - file HRDG022184_certclint.dll"
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author = "Florian Roth"
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reference = "https://goo.gl/WVflzO"
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date = "2016-12-29"
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hash1 = "9f918fb741e951a10e68ce6874b839aef5a26d60486db31e509f8dcaa13acec5"
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strings:
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$s1 = "S:\\Lidstone\\renewing\\HA\\disable\\In.pdb" fullword ascii
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$s2 = "Repeat last find command)Replace specific text with different text" fullword wide
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$s3 = "l\\Processor(0)\\% Processor Time" fullword wide
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$s6 = "Self Process" fullword wide
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$s7 = "Default Process" fullword wide
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$s8 = "Star Polk.exe" fullword wide
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condition:
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( uint16(0) == 0x5a4d and filesize < 300KB and 4 of them )
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}
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rule GRIZZLY_STEPPE_Malware_2 {
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meta:
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description = "Auto-generated rule - file 9acba7e5f972cdd722541a23ff314ea81ac35d5c0c758eb708fb6e2cc4f598a0"
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author = "Florian Roth"
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reference = "https://goo.gl/WVflzO"
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date = "2016-12-29"
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hash1 = "9acba7e5f972cdd722541a23ff314ea81ac35d5c0c758eb708fb6e2cc4f598a0"
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hash2 = "55058d3427ce932d8efcbe54dccf97c9a8d1e85c767814e34f4b2b6a6b305641"
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strings:
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$x1 = "GoogleCrashReport.dll" fullword ascii
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$s1 = "CrashErrors" fullword ascii
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$s2 = "CrashSend" fullword ascii
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$s3 = "CrashAddData" fullword ascii
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$s4 = "CrashCleanup" fullword ascii
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$s5 = "CrashInit" fullword ascii
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condition:
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( uint16(0) == 0x5a4d and filesize < 1000KB and $x1 ) or ( all of them )
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}
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rule PAS_TOOL_PHP_WEB_KIT_mod {
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meta:
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description = "Detects PAS Tool PHP Web Kit"
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reference = "https://www.us-cert.gov/security-publications/GRIZZLY-STEPPE-Russian-Malicious-Cyber-Activity"
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author = "US CERT - modified by Florian Roth due to performance reasons"
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date = "2016/12/29"
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strings:
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$php = "<?php"
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$base64decode1 = "='base'.("
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$strreplace = "str_replace(\"\\n\", ''"
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$md5 = ".substr(md5(strrev("
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$gzinflate = "gzinflate"
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$cookie = "_COOKIE"
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$isset = "isset"
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condition:
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$php at 0 and
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(filesize > 10KB and filesize < 30KB) and
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#cookie == 2 and
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#isset == 3 and
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all of them
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}
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rule WebShell_PHP_Web_Kit_v3 {
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meta:
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description = "Detects PAS Tool PHP Web Kit"
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reference = "https://github.com/wordfence/grizzly"
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author = "Florian Roth"
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date = "2016/01/01"
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strings:
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$php = "<?php $"
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$php2 = "@assert(base64_decode($_REQUEST["
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$s1 = "(str_replace(\"\\n\", '', '"
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$s2 = "(strrev($" ascii
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$s3 = "de'.'code';" ascii
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condition:
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( $php at 0 or $php2 ) and
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filesize > 8KB and filesize < 100KB and
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all of ($s*)
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}
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rule WebShell_PHP_Web_Kit_v4 {
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meta:
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description = "Detects PAS Tool PHP Web Kit"
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reference = "https://github.com/wordfence/grizzly"
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author = "Florian Roth"
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date = "2016/01/01"
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strings:
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$php = "<?php $"
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$s1 = "(StR_ReplAcE(\"\\n\",'',"
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$s2 = ";if(PHP_VERSION<'5'){" ascii
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$s3 = "=SuBstr_rePlACe(" ascii
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condition:
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$php at 0 and
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filesize > 8KB and filesize < 100KB and
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2 of ($s*)
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}
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