YARA · Malpedia signator rules
MALPEDIA_Win_Avos_Locker_Auto
autogenerated rule brought to you by yara-signator
MalwareAvos 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: Avos Locker.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-avos-locker-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Avos_Locker_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "3a7a2f13-5a61-5510-a1e8-ba3a5b4d5b24"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.avos_locker"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.avos_locker_auto.yar#L1-L132"
= "N/A"
= "40d6d22affd73241c0479cab6267e7741f726a96e3fe2d79a7c53b30d4d43858"
= 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 = { 8d8d18ffffff e9???????? 8d8d18ffffff e9???????? 8d8d20feffff e9???????? 8d8d14feffff }
$sequence_1 = { 6a6e 8d8df0fbffff e8???????? 8885f8fbffff 6a65 8d8df0fbffff e8???????? }
$sequence_2 = { 8d41e8 894431dc c706???????? c745fcffffffff 56 c706???????? e8???????? }
$sequence_3 = { 8bc8 ff7508 e8???????? e9???????? 0fbe41ff 8d04c510104a00 50 }
$sequence_4 = { f00fc14608 7507 8b06 8bce ff5004 6a20 }
$sequence_5 = { e8???????? 0fb600 50 8d8db0fcffff e8???????? 888563fdffff }
$sequence_6 = { c7855cffffff00000000 f30f7e4590 897db0 660f7ec8 660fd68558ffffff 83bd5cffffff10 898548ffffff }
$sequence_7 = { 0f8706010000 8d1c0e 3bda 7304 8bda eb0c 81fbffffff1f }
$sequence_8 = { 89842420020000 53 56 57 6800000100 c744241c5a003a00 c74424205c000000 }
$sequence_9 = { 8b530c 8b7b08 8955e8 897dcc 0fb602 35c59d1c81 69c893010001 }
condition:
7 of them and filesize < 1701888
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 8d8d18ffffff e9???????? 8d8d18ffffff e9???????? 8d8d20feffff e9???????? 8d8d14feffff } | |
| $sequence_1 | hex | { 6a6e 8d8df0fbffff e8???????? 8885f8fbffff 6a65 8d8df0fbffff e8???????? } | |
| $sequence_2 | hex | { 8d41e8 894431dc c706???????? c745fcffffffff 56 c706???????? e8???????? } | |
| $sequence_3 | hex | { 8bc8 ff7508 e8???????? e9???????? 0fbe41ff 8d04c510104a00 50 } | |
| $sequence_4 | hex | { f00fc14608 7507 8b06 8bce ff5004 6a20 } | |
| $sequence_5 | hex | { e8???????? 0fb600 50 8d8db0fcffff e8???????? 888563fdffff } | |
| $sequence_6 | hex | { c7855cffffff00000000 f30f7e4590 897db0 660f7ec8 660fd68558ffffff 83bd5cffffff10 898548ffffff } | |
| $sequence_7 | hex | { 0f8706010000 8d1c0e 3bda 7304 8bda eb0c 81fbffffff1f } | |
| $sequence_8 | hex | { 89842420020000 53 56 57 6800000100 c744241c5a003a00 c74424205c000000 } | |
| $sequence_9 | hex | { 8b530c 8b7b08 8955e8 897dcc 0fb602 35c59d1c81 69c893010001 } |
Condition
7 of them and filesize < 1701888In plain words (Heuristic)
- The file must be smaller than 1701888 (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: 3a7a2f13-5a61-5510-a1e8-ba3a5b4d5b24
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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