YARA · Malpedia signator rules
MALPEDIA_Win_Avcrypt_Auto
autogenerated rule brought to you by yara-signator
MalwareAvcryptMalpedia 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: Avcrypt.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-avcrypt-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Avcrypt_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "43b84f09-1b5d-50e6-aaa6-ed2245c22ea0"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.avcrypt"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.avcrypt_auto.yar#L1-L128"
= "N/A"
= "72ee95635b57f552cfa51bb0200ba397da957a30f2c8df0690d43c12220d0d09"
= 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 = { 59 5e c3 b8ffff0000 c20400 33c0 33d2 }
$sequence_1 = { 53 8bce c706???????? e8???????? 8bc7 }
$sequence_2 = { ff75f0 ff15???????? 85c0 790b 8b45f0 50 }
$sequence_3 = { 8b02 eb02 8bc2 3bc8 7413 83e902 ebb6 }
$sequence_4 = { 50 e8???????? 59 85c0 7456 837d1c08 }
$sequence_5 = { ff15???????? 85c0 7507 68???????? ffd6 895de4 837dd000 }
$sequence_6 = { 85c9 7408 8b85ccfdffff 8901 83460404 8d85c4fdffff }
$sequence_7 = { 50 89742414 897c2418 c744241c20000000 ff15???????? 8b450c 48 }
$sequence_8 = { c1e106 8b048580b54300 804c080420 8b4d14 8b75f8 ba000000c0 8bc6 }
$sequence_9 = { 8bf1 8b4690 8d4ea0 8b4004 c7443090b4484300 8b4690 }
condition:
7 of them and filesize < 6160384
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 59 5e c3 b8ffff0000 c20400 33c0 33d2 } | |
| $sequence_1 | hex | { 53 8bce c706???????? e8???????? 8bc7 } | |
| $sequence_2 | hex | { ff75f0 ff15???????? 85c0 790b 8b45f0 50 } | |
| $sequence_3 | hex | { 8b02 eb02 8bc2 3bc8 7413 83e902 ebb6 } | |
| $sequence_4 | hex | { 50 e8???????? 59 85c0 7456 837d1c08 } | |
| $sequence_5 | hex | { ff15???????? 85c0 7507 68???????? ffd6 895de4 837dd000 } | |
| $sequence_6 | hex | { 85c9 7408 8b85ccfdffff 8901 83460404 8d85c4fdffff } | |
| $sequence_7 | hex | { 50 89742414 897c2418 c744241c20000000 ff15???????? 8b450c 48 } | |
| $sequence_8 | hex | { c1e106 8b048580b54300 804c080420 8b4d14 8b75f8 ba000000c0 8bc6 } | |
| $sequence_9 | hex | { 8bf1 8b4690 8d4ea0 8b4004 c7443090b4484300 8b4690 } |
Condition
7 of them and filesize < 6160384In plain words (Heuristic)
- The file must be smaller than 6160384 (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.
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: 43b84f09-1b5d-50e6-aaa6-ed2245c22ea0
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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