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MALPEDIA_Win_Rtm_Locker_Auto

autogenerated rule brought to you by yara-signator

MalwareRtm LockerMalpedia 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: Rtm Locker.

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

Summary generated from the rule's metadata and condition.

Rule source

win-rtm-locker-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Rtm_Locker_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "37ffb73f-f9fd-5ba4-95b3-e1ad51521463"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.rtm_locker"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.rtm_locker_auto.yar#L1-L127"
		license_url = "N/A"
		logic_hash = "069c4670d441f7c98d084344e3ea7277dd36e7f0d4a7dcd04ed8e226563c6733"
		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 = { 0f289d60ffffff 8d5640 8d458c 33ff 3bf0 7711 8d8550ffffff }
		$sequence_1 = { 885c012e 8b0495500f4200 804c012d04 46 ebb3 ff15???????? 8945a8 }
		$sequence_2 = { 8d0c9500000000 23d1 8955d8 8b55e4 81f2ffffff03 f7d2 8bca }
		$sequence_3 = { 0f104598 0f118580fcffff 0f1045a8 0f118590fcffff e8???????? 8d8d68ffffff }
		$sequence_4 = { 6a03 8d44241c 50 6a00 6a14 ff15???????? 5f }
		$sequence_5 = { f7d7 23d9 81f6ffffff03 8bcb f7d6 c1e108 81f2ffffff01 }
		$sequence_6 = { 8d8540fdffff 50 0f1185f0fcffff 8d95f0fcffff }
		$sequence_7 = { 8d9518ffffff 0f104588 8d8d68ffffff 0f118538ffffff 0f104598 0f118548ffffff }
		$sequence_8 = { 56 50 8b45e4 0345fc 50 }
		$sequence_9 = { 8be5 5d c3 b801000000 8b4df0 64890d00000000 5f }

	condition:
		7 of them and filesize < 598016
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 0f289d60ffffff 8d5640 8d458c 33ff 3bf0 7711 8d8550ffffff }
$sequence_1hex{ 885c012e 8b0495500f4200 804c012d04 46 ebb3 ff15???????? 8945a8 }
$sequence_2hex{ 8d0c9500000000 23d1 8955d8 8b55e4 81f2ffffff03 f7d2 8bca }
$sequence_3hex{ 0f104598 0f118580fcffff 0f1045a8 0f118590fcffff e8???????? 8d8d68ffffff }
$sequence_4hex{ 6a03 8d44241c 50 6a00 6a14 ff15???????? 5f }
$sequence_5hex{ f7d7 23d9 81f6ffffff03 8bcb f7d6 c1e108 81f2ffffff01 }
$sequence_6hex{ 8d8540fdffff 50 0f1185f0fcffff 8d95f0fcffff }
$sequence_7hex{ 8d9518ffffff 0f104588 8d8d68ffffff 0f118538ffffff 0f104598 0f118548ffffff }
$sequence_8hex{ 56 50 8b45e4 0345fc 50 }
$sequence_9hex{ 8be5 5d c3 b801000000 8b4df0 64890d00000000 5f }

Condition

7 of them and filesize < 598016

In plain words (Heuristic)

  • The file must be smaller than 598016 (a cheap guard that skips large files).
  • At least 7 patterns in the rule must match.

Test this rule in your browser

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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: 37ffb73f-f9fd-5ba4-95b3-e1ad51521463

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