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MALPEDIA_Win_Gandcrab_Auto

autogenerated rule brought to you by yara-signator

MalwareGandcrabMalpedia signator rulesCreative Commons Attribution-ShareAlike 4.0Compiles with YARA-X
Author
Felix Bilstein - yara-signator at cocacoding dot com
Date
2026-05-04
Modified
2026-05-18
Score / Quality
75 / 75

What this rule detects

autogenerated rule brought to you by yara-signator

Associated malware family: Gandcrab.

It defines 10 patterns (0 text, 10 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

win-gandcrab-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Gandcrab_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "edf9d73e-47bb-5498-8314-d2a26c7eb915"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.gandcrab"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.gandcrab_auto.yar#L1-L119"
		license_url = "N/A"
		logic_hash = "8e0dc2dc5f594011ff141e52d0970e654fe224cfb5f2cb26869ab34c100952d0"
		score = 75
		quality = 75
		tags = "FILE"
		version = "1"
		tool = "yara-signator v0.6.0"
		signator_config = "callsandjumps;datarefs;binvalue"
		malpedia_rule_date = "20260422"
		malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
		malpedia_version = "20260504"
		malpedia_license = "CC BY-SA 4.0"
		malpedia_sharing = "TLP:WHITE"

	strings:
		$sequence_0 = { ff7744 ff15???????? ff7740 8bf0 ff15???????? 03c3 }
		$sequence_1 = { ff15???????? ff7728 8bf0 ff15???????? 03c3 8d5e04 }
		$sequence_2 = { ff15???????? 03c3 8d5e04 03d8 837f4800 741b }
		$sequence_3 = { ff15???????? ff7740 8bf0 ff15???????? 03c3 }
		$sequence_4 = { 03c3 8d5e04 03d8 837f3000 741b ff7738 ff15???????? }
		$sequence_5 = { 837f7400 741b ff777c ff15???????? ff7778 8bf0 }
		$sequence_6 = { ff777c ff15???????? ff7778 8bf0 ff15???????? }
		$sequence_7 = { ff7738 ff15???????? ff7734 8bf0 ff15???????? }
		$sequence_8 = { 741b ff7750 ff15???????? ff774c }
		$sequence_9 = { 03c3 8d5e04 03d8 837f3000 741b }

	condition:
		7 of them and filesize < 1024000
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ ff7744 ff15???????? ff7740 8bf0 ff15???????? 03c3 }
$sequence_1hex{ ff15???????? ff7728 8bf0 ff15???????? 03c3 8d5e04 }
$sequence_2hex{ ff15???????? 03c3 8d5e04 03d8 837f4800 741b }
$sequence_3hex{ ff15???????? ff7740 8bf0 ff15???????? 03c3 }
$sequence_4hex{ 03c3 8d5e04 03d8 837f3000 741b ff7738 ff15???????? }
$sequence_5hex{ 837f7400 741b ff777c ff15???????? ff7778 8bf0 }
$sequence_6hex{ ff777c ff15???????? ff7778 8bf0 ff15???????? }
$sequence_7hex{ ff7738 ff15???????? ff7734 8bf0 ff15???????? }
$sequence_8hex{ 741b ff7750 ff15???????? ff774c }
$sequence_9hex{ 03c3 8d5e04 03d8 837f3000 741b }

Condition

7 of them and filesize < 1024000

In plain words (Heuristic)

  • The file must be smaller than 1024000 (a cheap guard that skips large files).
  • At least 7 patterns in the rule must match.

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References

Licence & attribution

Author: Felix Bilstein - yara-signator at cocacoding dot com

Source repository: Malpedia signator rules @ c901f97b7d

Licence: Creative Commons Attribution-ShareAlike 4.0 (repository licence)

Original rule

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

Rule id: edf9d73e-47bb-5498-8314-d2a26c7eb915

Metadata

version1
toolyara-signator v0.6.0
signator_configcallsandjumps;datarefs;binvalue
malpedia_rule_date20260422
malpedia_hasha182e35da64e6d71cb55f125c4d4225196523f14
malpedia_version20260504
malpedia_licenseCC BY-SA 4.0
malpedia_sharingTLP:WHITE

Tags:FILE