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MALPEDIA_Win_Wm_Rat_Auto

autogenerated rule brought to you by yara-signator

MalwareWm RatMalpedia 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: Wm Rat.

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

Summary generated from the rule's metadata and condition.

Rule source

win-wm-rat-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Wm_Rat_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "747bdadd-c5ad-51c6-aa42-0fc395c36715"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.wm_rat"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.wm_rat_auto.yar#L1-L132"
		license_url = "N/A"
		logic_hash = "915161228258a5b3eac41ee3f036022feee5d4f01a85152598b95c9fb0f4ab1f"
		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 = { 8b442410 50 e8???????? 83c404 6a64 ffd6 }
		$sequence_1 = { 50 ffd6 83c40c 8d8c24d4110000 51 b9???????? }
		$sequence_2 = { 8d8c24600d0000 e9???????? 8b4c2424 51 ff15???????? 8b3d???????? 89442424 }
		$sequence_3 = { 50 8d8424a43d0000 64a300000000 33db 68???????? 8d8c24b83d0000 899c24b03d0000 }
		$sequence_4 = { b9???????? ff15???????? 8d9424d4120000 52 b9???????? ff15???????? 83ec1c }
		$sequence_5 = { 8944242c 89442414 a1???????? c744240c00000000 c744241801000000 c744241c06000000 7305 }
		$sequence_6 = { 8d44242c 50 e8???????? 83c40c ff15???????? 33c9 68ac010000 }
		$sequence_7 = { 52 50 ffd1 8d7c2428 8bf0 e8???????? 8d7c2424 }
		$sequence_8 = { 8b15???????? a1???????? 8b0d???????? 03c2 8b15???????? 89442414 db442414 }
		$sequence_9 = { e8???????? 8d542408 c684247401000002 8b4c242c 52 e8???????? c684247401000004 }

	condition:
		7 of them and filesize < 258048
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 8b442410 50 e8???????? 83c404 6a64 ffd6 }
$sequence_1hex{ 50 ffd6 83c40c 8d8c24d4110000 51 b9???????? }
$sequence_2hex{ 8d8c24600d0000 e9???????? 8b4c2424 51 ff15???????? 8b3d???????? 89442424 }
$sequence_3hex{ 50 8d8424a43d0000 64a300000000 33db 68???????? 8d8c24b83d0000 899c24b03d0000 }
$sequence_4hex{ b9???????? ff15???????? 8d9424d4120000 52 b9???????? ff15???????? 83ec1c }
$sequence_5hex{ 8944242c 89442414 a1???????? c744240c00000000 c744241801000000 c744241c06000000 7305 }
$sequence_6hex{ 8d44242c 50 e8???????? 83c40c ff15???????? 33c9 68ac010000 }
$sequence_7hex{ 52 50 ffd1 8d7c2428 8bf0 e8???????? 8d7c2424 }
$sequence_8hex{ 8b15???????? a1???????? 8b0d???????? 03c2 8b15???????? 89442414 db442414 }
$sequence_9hex{ e8???????? 8d542408 c684247401000002 8b4c242c 52 e8???????? c684247401000004 }

Condition

7 of them and filesize < 258048

In plain words (Heuristic)

  • The file must be smaller than 258048 (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: 747bdadd-c5ad-51c6-aa42-0fc395c36715

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