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DITEKSHEN_MALWARE_Win_Gelsevirine

Detects Gelsevirine

MalwareGelsevirineditekSHen detectionBSD 2-Clause LicenseCompiles with YARA-X (with warnings)
Author
ditekSHen
Date
2020-11-06
Modified
2024-11-01
Score / Quality
75 / 73

What this rule detects

Detects Gelsevirine

Associated malware family: Gelsevirine.

Targets: Windows PE.

It defines 23 patterns (22 text, 0 hex, 1 regex).

YARA-X says: warning[duplicate_pattern_value]: duplicate pattern value

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
malware-win-gelsevirine.yarBSD 2-Clause License
rule DITEKSHEN_MALWARE_Win_Gelsevirine : FILE
{
	meta:
		description = "Detects Gelsevirine"
		author = "ditekSHen"
		id = "70f0ed08-4e07-5ab3-968e-95059d20a8e9"
		date = "2020-11-06"
		modified = "2024-11-01"
		reference = "https://github.com/ditekshen/detection"
		source_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/yara/malware.yar#L6224-L6254"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "60d41d6d789f1cd2a7040d6535f13c69ea58a489035838f047b886e8f1f37f63"
		score = 75
		quality = 73
		tags = "FILE"

	strings:
		$s1 = /64loadpath(xp|sv|7)/ fullword wide
		$s2 = "{\"Actions\":[]}" fullword wide
		$s3 = "PlatformsChunk" fullword wide
		$s4 = "CurrentPluginCategory" fullword wide
		$s5 = "CurrentOperationPlatform" fullword wide
		$s6 = "PersistencePlugins" fullword wide
		$s7 = "memory_library_file" fullword wide
		$s8 = "LoadPluginBP" fullword ascii
		$s9 = "GetOperationBasicInformation" fullword ascii
		$s10 = "commonappdata/Intel/Runtime" wide
		$s11 = "cfsst x64" fullword wide
		$s12 = "ForkOperation" fullword ascii
		$c1 = "domain.dns04.com:8080;domain.dns04.com:443;acro.ns1.name:80;acro.ns1.name:1863;" wide
		$c2 = "<base64 content=\"" fullword ascii
		$c3 = "User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)" fullword ascii
		$m1 = "6BDA7FEF-232F-4EA6-8FC8-24F58CD7B366" ascii wide
		$m2 = "46EBBDC3-EEDC-42D4-BA1D-D454DFCE8E42" ascii wide
		$m3 = "135054C6-8036-42C7-A97C-31F37D7728BD" ascii wide
		$m4 = "DC7FDDF7-B2F1-4B99-BE6A-AA683FF11CE6" ascii wide
		$m5 = "131C8113-E083-4C7F-BEAF-82D73B01F2C5" ascii wide
		$m6 = "4CCF506D-2F61-4C3A-B9C6-9FA47D43A3FC" ascii wide
		$m7 = "B2DC745A-66AE-4A19-B11C-AD74D46B7EE0" ascii wide
		$m8 = "6BDA7FEF-232F-4EA6-8FC8-24F58CD7B366" ascii wide

	condition:
		uint16( 0 ) == 0x5a4d and ( 6 of ( $s* ) or ( 2 of ( $c* ) and 4 of ( $s* ) ) or ( 5 of ( $m* ) and ( 1 of ( $c* ) or 3 of ( $s* ) ) ) )
}

Strings (23 patterns)

IdentifierTypeValueModifiers
$s1regex/64loadpath(xp|sv|7)/fullword wide
$s2text"{\"Actions\":[]}"fullword wide
$s3text"PlatformsChunk"fullword wide
$s4text"CurrentPluginCategory"fullword wide
$s5text"CurrentOperationPlatform"fullword wide
$s6text"PersistencePlugins"fullword wide
$s7text"memory_library_file"fullword wide
$s8text"LoadPluginBP"fullword ascii
$s9text"GetOperationBasicInformation"fullword ascii
$s10text"commonappdata/Intel/Runtime"wide
$s11text"cfsst x64"fullword wide
$s12text"ForkOperation"fullword ascii
$c1text"domain.dns04.com:8080;domain.dns04.com:443;acro.ns1.name:80;acro.ns1.name:1863;"wide
$c2text"<base64 content=\""fullword ascii
$c3text"User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)"fullword ascii
$m1text"6BDA7FEF-232F-4EA6-8FC8-24F58CD7B366"ascii wide
$m2text"46EBBDC3-EEDC-42D4-BA1D-D454DFCE8E42"ascii wide
$m3text"135054C6-8036-42C7-A97C-31F37D7728BD"ascii wide
$m4text"DC7FDDF7-B2F1-4B99-BE6A-AA683FF11CE6"ascii wide
$m5text"131C8113-E083-4C7F-BEAF-82D73B01F2C5"ascii wide
$m6text"4CCF506D-2F61-4C3A-B9C6-9FA47D43A3FC"ascii wide
$m7text"B2DC745A-66AE-4A19-B11C-AD74D46B7EE0"ascii wide
$m8text"6BDA7FEF-232F-4EA6-8FC8-24F58CD7B366"ascii wide

Condition

uint16( 0 ) == 0x5a4d and ( 6 of ( $s* ) or ( 2 of ( $c* ) and 4 of ( $s* ) ) or ( 5 of ( $m* ) and ( 1 of ( $c* ) or 3 of ( $s* ) ) ) )

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • At least 6 patterns in ( $s* ) must match.
  • At least 2 patterns in ( $c* ) must match.
  • At least 4 patterns in ( $s* ) must match.
  • At least 5 patterns in ( $m* ) must match.
  • At least 1 patterns in ( $c* ) must match.
  • At least 3 patterns in ( $s* ) must match.

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References

Licence & attribution

Author: ditekSHen

Source repository: ditekSHen detection @ e76c93dcde

Licence: BSD 2-Clause License (repository licence)

Copyright notice: Copyright 2021 by ditekSHen (https://github.com/ditekshen/detection).

Original rule

Mirrored via YARA Forge 20260927, which prefixes rule names with the source and adds normalised meta fields.

Rule id: 70f0ed08-4e07-5ab3-968e-95059d20a8e9

Tags:FILE

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