YARA · Malpedia signator rules
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:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "37ffb73f-f9fd-5ba4-95b3-e1ad51521463"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.rtm_locker"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.rtm_locker_auto.yar#L1-L127"
= "N/A"
= "069c4670d441f7c98d084344e3ea7277dd36e7f0d4a7dcd04ed8e226563c6733"
= 75
= 75
= "FILE"
= "1"
= "yara-signator v0.6.0"
= "callsandjumps;datarefs;binvalue"
= "20260422"
= "a182e35da64e6d71cb55f125c4d4225196523f14"
= "20260504"
= "CC BY-SA 4.0"
= "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)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 0f289d60ffffff 8d5640 8d458c 33ff 3bf0 7711 8d8550ffffff } | |
| $sequence_1 | hex | { 885c012e 8b0495500f4200 804c012d04 46 ebb3 ff15???????? 8945a8 } | |
| $sequence_2 | hex | { 8d0c9500000000 23d1 8955d8 8b55e4 81f2ffffff03 f7d2 8bca } | |
| $sequence_3 | hex | { 0f104598 0f118580fcffff 0f1045a8 0f118590fcffff e8???????? 8d8d68ffffff } | |
| $sequence_4 | hex | { 6a03 8d44241c 50 6a00 6a14 ff15???????? 5f } | |
| $sequence_5 | hex | { f7d7 23d9 81f6ffffff03 8bcb f7d6 c1e108 81f2ffffff01 } | |
| $sequence_6 | hex | { 8d8540fdffff 50 0f1185f0fcffff 8d95f0fcffff } | |
| $sequence_7 | hex | { 8d9518ffffff 0f104588 8d8d68ffffff 0f118538ffffff 0f104598 0f118548ffffff } | |
| $sequence_8 | hex | { 56 50 8b45e4 0345fc 50 } | |
| $sequence_9 | hex | { 8be5 5d c3 b801000000 8b4df0 64890d00000000 5f } |
Condition
7 of them and filesize < 598016In 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
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.
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)
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
| 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 |
Tags:FILE
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