Skip to content

YARA · Malpedia signator rules

MALPEDIA_Win_Leash_Auto

autogenerated rule brought to you by yara-signator

MalwareLeashMalpedia 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: Leash.

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

Summary generated from the rule's metadata and condition.

Rule source

win-leash-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Leash_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "35986a45-731e-5b33-8972-5a112dfc0fb1"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.leash"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.leash_auto.yar#L1-L133"
		license_url = "N/A"
		logic_hash = "cbe363d95ef920a5a4c20a6b994434ecf799cc3c166f9de1e2837ac2d62aec2f"
		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 = { 3bc8 8944241c 0f8ef5000000 85db c744244400000000 0f8eb4000000 8b7c2418 }
		$sequence_1 = { f2ae f7d1 2bf9 8d95e0fdffff 8bc1 8bf7 8bfa }
		$sequence_2 = { 8bfb 8b9c2424200000 c1e902 f3a5 8bc8 88542413 83e103 }
		$sequence_3 = { 68???????? e8???????? 8d8c241c040000 51 6a10 68???????? }
		$sequence_4 = { 53 e8???????? 83c41c eb04 8b742414 56 8bcb }
		$sequence_5 = { 51 8d4db0 c645fc05 8975ec e8???????? 8d55d4 8bf8 }
		$sequence_6 = { 8dbd9dd8ffff 889d9cd8ffff f3ab 66ab aa b9ff000000 33c0 }
		$sequence_7 = { 8d8514fcffff 52 50 e8???????? 83c40c 8d4dec 8bf0 }
		$sequence_8 = { 8b4c2414 8b7c2448 2bce 894c2448 8b4c2424 2bce 894c2430 }
		$sequence_9 = { 85f6 0f8c97000000 8d4601 8d4dec 50 6a2e e8???????? }

	condition:
		7 of them and filesize < 761856
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 3bc8 8944241c 0f8ef5000000 85db c744244400000000 0f8eb4000000 8b7c2418 }
$sequence_1hex{ f2ae f7d1 2bf9 8d95e0fdffff 8bc1 8bf7 8bfa }
$sequence_2hex{ 8bfb 8b9c2424200000 c1e902 f3a5 8bc8 88542413 83e103 }
$sequence_3hex{ 68???????? e8???????? 8d8c241c040000 51 6a10 68???????? }
$sequence_4hex{ 53 e8???????? 83c41c eb04 8b742414 56 8bcb }
$sequence_5hex{ 51 8d4db0 c645fc05 8975ec e8???????? 8d55d4 8bf8 }
$sequence_6hex{ 8dbd9dd8ffff 889d9cd8ffff f3ab 66ab aa b9ff000000 33c0 }
$sequence_7hex{ 8d8514fcffff 52 50 e8???????? 83c40c 8d4dec 8bf0 }
$sequence_8hex{ 8b4c2414 8b7c2448 2bce 894c2448 8b4c2424 2bce 894c2430 }
$sequence_9hex{ 85f6 0f8c97000000 8d4601 8d4dec 50 6a2e e8???????? }

Condition

7 of them and filesize < 761856

In plain words (Heuristic)

  • The file must be smaller than 761856 (a cheap guard that skips large files).
  • At least 7 patterns in the rule must match.

Test this rule in your browser

Drop a file to scan it with this rule using YARA-X compiled to WebAssembly. Nothing is uploaded.

Drop a file here or click to chooseScanned locally with YARA-X. Files up to 200 MB.

Open in editor

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: 35986a45-731e-5b33-8972-5a112dfc0fb1

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