YARA · Malpedia signator rules
MALPEDIA_Win_Locky_Decryptor_Auto
autogenerated rule brought to you by yara-signator
MalwareLocky DecryptorMalpedia 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: Locky Decryptor.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-locky-decryptor-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Locky_Decryptor_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "ecfeaf41-63ea-55ed-b4aa-03611cff89ae"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.locky_decryptor"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.locky_decryptor_auto.yar#L1-L121"
= "N/A"
= "0702ae083d89f6bb2206cb125aaa99e0dffc193c2fefab2c47131b299ccaf228"
= 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 = { 50 56 ff750c 895de8 8b3d???????? }
$sequence_1 = { 50 56 e8???????? 83c40c 85ff 0f8435010000 }
$sequence_2 = { 03c7 5a 2b5010 68???????? 01542410 8bf0 }
$sequence_3 = { 8d4508 668378023a 7440 837d1c08 8b4508 7303 8d4508 }
$sequence_4 = { c745f0b86b4100 e8???????? c9 c20c00 55 8bec 83ec10 }
$sequence_5 = { 83c11c 4b 395c2414 7cc8 }
$sequence_6 = { 7209 83ffff 0f879c000000 8d742424 e8???????? c644244c01 85db }
$sequence_7 = { 57 8bc2 c1f805 8b048500c14100 }
$sequence_8 = { 8d4db0 51 c645fc01 e8???????? 56 }
$sequence_9 = { 50 56 53 8d742454 e8???????? 50 }
condition:
7 of them and filesize < 278528
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 50 56 ff750c 895de8 8b3d???????? } | |
| $sequence_1 | hex | { 50 56 e8???????? 83c40c 85ff 0f8435010000 } | |
| $sequence_2 | hex | { 03c7 5a 2b5010 68???????? 01542410 8bf0 } | |
| $sequence_3 | hex | { 8d4508 668378023a 7440 837d1c08 8b4508 7303 8d4508 } | |
| $sequence_4 | hex | { c745f0b86b4100 e8???????? c9 c20c00 55 8bec 83ec10 } | |
| $sequence_5 | hex | { 83c11c 4b 395c2414 7cc8 } | |
| $sequence_6 | hex | { 7209 83ffff 0f879c000000 8d742424 e8???????? c644244c01 85db } | |
| $sequence_7 | hex | { 57 8bc2 c1f805 8b048500c14100 } | |
| $sequence_8 | hex | { 8d4db0 51 c645fc01 e8???????? 56 } | |
| $sequence_9 | hex | { 50 56 53 8d742454 e8???????? 50 } |
Condition
7 of them and filesize < 278528In plain words (Heuristic)
- The file must be smaller than 278528 (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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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: ecfeaf41-63ea-55ed-b4aa-03611cff89ae
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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