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MALPEDIA_Win_Cryptoluck_Auto

autogenerated rule brought to you by yara-signator

MalwareCryptoluckMalpedia 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: Cryptoluck.

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

Summary generated from the rule's metadata and condition.

Rule source

win-cryptoluck-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Cryptoluck_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "476c2670-d790-55ec-85fd-c563f315b8b6"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.cryptoluck"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.cryptoluck_auto.yar#L1-L126"
		license_url = "N/A"
		logic_hash = "c24c7722274c413e89c021a9199d9e1c3695af594b0678aa9edf1f88c7cb42e0"
		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 = { 83bd3cefffff00 7429 8b8544efffff c60000 8b8d44efffff 83c101 }
		$sequence_1 = { 6a02 ff15???????? 3d420200c0 751b }
		$sequence_2 = { 8b45e8 50 ff15???????? 8b0d???????? 51 8b55e8 }
		$sequence_3 = { e8???????? 83c410 8945d4 c745d000000000 6a00 8d55d0 52 }
		$sequence_4 = { 8d45fc 50 8b4df8 51 8d5514 52 8b4510 }
		$sequence_5 = { 8d45fc 50 8b4d0c 51 6a00 6a00 6a02 }
		$sequence_6 = { 6a02 6a00 8b85d8fbffff 50 ff15???????? 8985ccfbffff 83bdccfbffff00 }
		$sequence_7 = { 50 8b4d20 51 ff15???????? 8b55e4 }
		$sequence_8 = { 8b95f4fdffff 52 e8???????? 83c404 6a00 8d85f8fdffff 50 }
		$sequence_9 = { f7da 1ad2 80e217 80c243 0fbec2 8945ec }

	condition:
		7 of them and filesize < 229376
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 83bd3cefffff00 7429 8b8544efffff c60000 8b8d44efffff 83c101 }
$sequence_1hex{ 6a02 ff15???????? 3d420200c0 751b }
$sequence_2hex{ 8b45e8 50 ff15???????? 8b0d???????? 51 8b55e8 }
$sequence_3hex{ e8???????? 83c410 8945d4 c745d000000000 6a00 8d55d0 52 }
$sequence_4hex{ 8d45fc 50 8b4df8 51 8d5514 52 8b4510 }
$sequence_5hex{ 8d45fc 50 8b4d0c 51 6a00 6a00 6a02 }
$sequence_6hex{ 6a02 6a00 8b85d8fbffff 50 ff15???????? 8985ccfbffff 83bdccfbffff00 }
$sequence_7hex{ 50 8b4d20 51 ff15???????? 8b55e4 }
$sequence_8hex{ 8b95f4fdffff 52 e8???????? 83c404 6a00 8d85f8fdffff 50 }
$sequence_9hex{ f7da 1ad2 80e217 80c243 0fbec2 8945ec }

Condition

7 of them and filesize < 229376

In plain words (Heuristic)

  • The file must be smaller than 229376 (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: 476c2670-d790-55ec-85fd-c563f315b8b6

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