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295 lines
11 KiB
Plaintext
295 lines
11 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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license = "https://creativecommons.org/licenses/by-nc/4.0/"
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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"
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license = "https://creativecommons.org/licenses/by-nc/4.0/"
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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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uint32(0) == 0x68703f3c and
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$php at 0 and
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(filesize > 10KB and filesize < 30KB) and
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#cookie == 2 and
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#isset == 3 and
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all of them
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}
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rule WebShell_PHP_Web_Kit_v3 {
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meta:
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description = "Detects PAS Tool PHP Web Kit"
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reference = "https://github.com/wordfence/grizzly"
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license = "https://creativecommons.org/licenses/by-nc/4.0/"
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author = "Florian Roth"
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date = "2016/01/01"
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strings:
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$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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( ( uint32(0) == 0x68703f3c and $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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license = "https://creativecommons.org/licenses/by-nc/4.0/"
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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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uint32(0) == 0x68703f3c and
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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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rule APT_APT29_wellmess_dotnet_unique_strings {
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meta:
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description = "Rule to detect WellMess .NET samples based on unique strings and function/variable names"
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author = "NCSC"
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reference = "https://www.ncsc.gov.uk/news/advisory-apt29-targets-covid-19-vaccine-development"
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hash = "2285a264ffab59ab5a1eb4e2b9bcab9baf26750b6c551ee3094af56a4442ac41"
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strings:
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$s1 = "HealthInterval" wide
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$s2 = "Hello from Proxy" wide
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$s3 = "Start bot:" wide
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$s4 = "FromNormalToBase64" ascii
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$s5 = "FromBase64ToNormal" ascii
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$s6 = "WellMess" ascii
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condition:
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uint16(0) == 0x5a4d and uint16(uint16(0x3c)) == 0x4550 and 3 of them
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}
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rule APT_APT29_sorefang_encryption_key_schedule {
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meta:
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description = "Rule to detect SoreFang based on the key schedule used for encryption"
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author = "NCSC"
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reference = "https://www.ncsc.gov.uk/news/advisory-apt29-targets-covid-19-vaccine-development"
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hash = "58d8e65976b53b77645c248bfa18c3b87a6ecfb02f306fe6ba4944db96a5ede2"
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strings:
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$ = { C7 05 ?? ?? ?? ?? 63 51 E1 B7 B8 ?? ?? ?? ?? 8B 48
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FC 81 E9 47 86 C8 61 89 08 83 C0 04 3D ?? ?? ?? ??
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7E EB 33 D2 33 C9 B8 2C 00 00 00 89 55 D4 33 F6 89
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4D D8 33 DB 3B F8 0F 4F C7 8D 04 40 89 45 D0 83 F8
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01 7C 4F 0F 1F 80 00 00 00 00 }
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condition:
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(uint16(0) == 0x5A4D and uint16(uint32(0x3c)) == 0x4550) and any of them
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}
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rule APT_APT29_sorefang_encryption_key_2b62 {
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meta:
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description = "Rule to detect SoreFang based on hardcoded encryption key"
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author = "NCSC"
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reference = "https://www.ncsc.gov.uk/news/advisory-apt29-targets-covid-19-vaccine-development"
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hash = "58d8e65976b53b77645c248bfa18c3b87a6ecfb02f306fe6ba4944db96a5ede2"
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strings:
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$ = "2b6233eb3e872ff78988f4a8f3f6a3ba"
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condition:
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( uint16(0) == 0x5A4D and uint16(uint32(0x3c) ) == 0x4550)
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and any of them
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}
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rule APT_APT29_sorefang_directory_enumeration_output_strings {
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meta:
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description = "Rule to detect SoreFang based on formatted string output for directory enumeration"
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author = "NCSC"
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reference = "https://www.ncsc.gov.uk/news/advisory-apt29-targets-covid-19-vaccine-development"
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hash = "58d8e65976b53b77645c248bfa18c3b87a6ecfb02f306fe6ba4944db96a5ede2"
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strings:
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$ = "----------All usres directory----------"
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$ = "----------Desktop directory----------"
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$ = "----------Documents directory----------"
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condition:
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(uint16(0) == 0x5A4D and uint16(uint32(0x3c)) == 0x4550)
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and 2 of them
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}
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rule APT_APT29_sorefang_command_elem_cookie_ga_boundary_string {
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meta:
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description = "Rule to detect SoreFang based on scheduled task element and Cookie header/boundary strings"
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author = "NCSC"
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reference = "https://www.ncsc.gov.uk/news/advisory-apt29-targets-covid-19-vaccine-development"
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hash = "58d8e65976b53b77645c248bfa18c3b87a6ecfb02f306fe6ba4944db96a5ede2"
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strings:
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$ = "<Command>" wide
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$ = "Cookie:_ga="
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$ = "------974767299852498929531610575"
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condition:
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(uint16(0) == 0x5A4D and uint16(uint32(0x3c)) == 0x4550)
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and 2 of them
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}
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rule APT_APT29_sorefang_encryption_round_function {
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meta:
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description = "Rule to detect SoreFang based on the encryption round function"
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author = "NCSC"
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reference = "https://www.ncsc.gov.uk/news/advisory-apt29-targets-covid-19-vaccine-development"
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hash = "58d8e65976b53b77645c248bfa18c3b87a6ecfb02f306fe6ba4944db96a5ede2"
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strings:
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$ = { 8A E9 8A FB 8A 5D 0F 02 C9 88 45 0F FE C1 0F BE C5 88 6D F3 8D
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14 45 01 00 00 00 0F AF D0 0F BE C5 0F BE C9 0F AF C8 C1 FA 1B C0 E1 05 0A D1 8B 4D EC 0F BE C1 89 55 E4 8D 14 45 01 00 00 00 0F AF D0 8B C1}
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condition:
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(uint16(0) == 0x5A4D and uint16(uint32(0x3c)) == 0x4550)
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and any of them
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}
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rule APT_APT29_sorefang_add_random_commas_spaces {
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meta:
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description = "Rule to detect SoreFang based on function that adds commas and spaces"
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author = "NCSC"
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reference = "https://www.ncsc.gov.uk/news/advisory-apt29-targets-covid-19-vaccine-development"
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hash = "58d8e65976b53b77645c248bfa18c3b87a6ecfb02f306fe6ba4944db96a5ede2"
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strings:
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$ = { E8 ?? ?? ?? ?? B9 06 00 00 00 99 F7 F9 8B CE 83 FA 04 7E 09 6A
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02 68 ?? ?? ?? ?? EB 07 6A 01 68 }
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condition:
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(uint16(0) == 0x5A4D and uint16(uint32(0x3c)) == 0x4550)
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and any of them
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}
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rule APT_APT29_sorefang_modify_alphabet_custom_encode {
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meta:
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description = "Rule to detect SoreFang based on arguments passed into custom encoding algorithm function"
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author = "NCSC"
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reference = "https://www.ncsc.gov.uk/news/advisory-apt29-targets-covid-19-vaccine-development"
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hash = "58d8e65976b53b77645c248bfa18c3b87a6ecfb02f306fe6ba4944db96a5ede2"
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strings:
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$ = { 33 C0 8B CE 6A 36 6A 71 66 89 46 60 88 46 62 89 46 68 66 89 46
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64 }
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condition:
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(uint16(0) == 0x5A4D and uint16(uint32(0x3c)) == 0x4550) and any of them
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}
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rule APT_APT29_sorefang_custom_encode_decode {
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meta:
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description = "Rule to detect SoreFang based on the custom encoding/decoding algorithm function"
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author = "NCSC"
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reference = "https://www.ncsc.gov.uk/news/advisory-apt29-targets-covid-19-vaccine-development"
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hash = "58d8e65976b53b77645c248bfa18c3b87a6ecfb02f306fe6ba4944db96a5ede2"
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strings:
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$ = { 55 8B EC 8B D1 53 56 8B 75 08 8B DE 80 42 62 FA 8A 4A 62 66 D3
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EB 57 3A 5A 5C 74 0F}
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$ = { 3A 5A 5D 74 0A 3A 5A 58 74 05 3A 5A 59 75 05 FE C1 88 4A 62 8A
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4A 62 B8 01 00 00 00}
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$ = { 8A 46 62 84 C0 74 3E 3C 06 73 12 0F B6 C0 B9 06 00 00 00 2B C8
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C6 46 62 06 66 D3 66 60 0F B7 4E 60}
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$ = { 80 3C 38 0D 0F 84 93 01 00 00 C6 42 62 06 8B 56 14 83 FA 10 72
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04 8B 06}
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$ = { 0F BE 0C 38 8B 45 EC 0F B6 40 5B 3B C8 75 07 8B 55 EC B3 3E}
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$ = { 0F BE 0C 38 8B 45 EC 0F B6 40 5E 3B C8 75 0B 8B 55 EC D0 EB C6
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42 62 05}
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$ = { 8B 55 EC 0F BE 04 38 0F B6 DB 0F B6 4A 5F 3B C1 B8 3F 00 00 00
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0F 44 D8}
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$ = { 8A 4A 62 66 8B 52 60 66 D3 E2 0F B6 C3 66 0B D0 8B 45 EC 66 89
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50 60 8A 45 F3 02 C1 88 45 F3 3C 08 72 2E 04 F8 8A C8 88 45 F3
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66 D3 EA 8B 4D 08 0F B6 C2 50 }
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$ = { 3A 5A 5C 74 0F 3A 5A 5D 74 0A 3A 5A 58 74 05 3A 5A 59 75 05 FE
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C1 88 4A 62 }
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condition:
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(uint16(0) == 0x5A4D and uint16(uint32(0x3c)) == 0x4550)
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and any of them
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}
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rule APT_APT29_sorefang_remove_chars_comma_space_dot {
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meta:
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description = "Rule to detect SoreFang based on function that removes commas, spaces and dots"
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author = "NCSC"
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reference = "https://www.ncsc.gov.uk/news/advisory-apt29-targets-covid-19-vaccine-development"
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hash = "58d8e65976b53b77645c248bfa18c3b87a6ecfb02f306fe6ba4944db96a5ede2"
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strings:
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$ = {8A 18 80 FB 2C 74 03 88 19 41 42 40 3B D6 75 F0 8B 5D 08}
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$ = {8A 18 80 FB 2E 74 03 88 19 41 42 40 3B D6 75 F0 8B 5D 08}
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$ = {8A 18 80 FB 20 74 03 88 19 41 42 40 3B D6 75 F0 8B 5D 08}
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condition:
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(uint16(0) == 0x5A4D and uint16(uint32(0x3c)) == 0x4550) and all of them
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}
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rule APT_APT29_sorefang_disk_enumeration_strings {
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meta:
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description = "Rule to detect SoreFang based on disk enumeration strings"
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author = "NCSC"
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reference = "https://www.ncsc.gov.uk/news/advisory-apt29-targets-covid-19-vaccine-development"
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hash = "a4b790ddffb3d2e6691dcacae08fb0bfa1ae56b6c73d70688b097ffa831af064"
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strings:
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$ = "\x0D\x0AFree on disk: "
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$ = "Total disk: "
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$ = "Error in GetDiskFreeSpaceEx\x0D\x0A"
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$ = "\x0D\x0AVolume label: "
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$ = "Serial number: "
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$ = "File system: "
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$ = "Error in GetVolumeInformation\x0D\x0A"
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$ = "I can not het information about this disk\x0D\x0A"
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condition:
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(uint16(0) == 0x5A4D and uint16(uint32(0x3c)) == 0x4550)
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and all of them
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}
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