YARA · Malpedia signator rules
MALPEDIA_Win_Vawtrak_Auto
autogenerated rule brought to you by yara-signator
MalwareVawtrakMalpedia 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 / 73
What this rule detects
autogenerated rule brought to you by yara-signator
Associated malware family: Vawtrak.
It defines 22 patterns (0 text, 22 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-vawtrak-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Vawtrak_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "779e17e2-0a5b-503c-9ec0-b238e6b49565"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.vawtrak"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.vawtrak_auto.yar#L1-L207"
= "N/A"
= "ba996f83019663a7eecfbae0747c28c946b24c8682ad79bc04bea8c2b6f7a6d5"
= 75
= 73
= "FILE"
= "1"
= "yara-signator v0.6.0"
= "callsandjumps;datarefs;binvalue"
= "20260422"
= "a182e35da64e6d71cb55f125c4d4225196523f14"
= "20260504"
= "CC BY-SA 4.0"
= "TLP:WHITE"
strings:
$sequence_0 = { 6a01 ff35???????? 6a04 6a01 50 }
$sequence_1 = { 6a00 6a00 e8???????? 50 ff15???????? }
$sequence_2 = { e8???????? 837d1040 752d 8b4d04 e8???????? 85c0 7421 }
$sequence_3 = { ba00ff0000 8bc1 23c2 3bc2 }
$sequence_4 = { 69d26d4ec641 81c239300000 2ac2 8801 }
$sequence_5 = { 0fb6c9 81c900ff0000 e8???????? 85c0 }
$sequence_6 = { ff15???????? a3???????? 85c0 74e7 }
$sequence_7 = { 7528 68???????? ff15???????? 85c0 7504 }
$sequence_8 = { 6a08 68???????? 56 ffd7 85c0 }
$sequence_9 = { e8???????? 33d2 b9ff3f0000 f7f1 }
$sequence_10 = { 59 57 8bf0 ff15???????? 8bc6 }
$sequence_11 = { 8bc6 8703 3bc6 74f8 }
$sequence_12 = { eb04 8b01 8907 e8???????? }
$sequence_13 = { ff750c ff7508 e8???????? 83c40c 8d45fc }
$sequence_14 = { f3aa 5f 5d c3 55 8bec 51 }
$sequence_15 = { c1e910 e9???????? 8ac1 c1e904 c0e004 }
$sequence_16 = { 8ac8 240f 80e1f0 80c110 }
$sequence_17 = { 3c41 7c11 3c46 7f0d }
$sequence_18 = { 488364242000 4c8d442430 4533c9 33d2 c744243001000000 c744243c02000000 }
$sequence_19 = { 40883c08 ff430c e9???????? 0f86bf000000 81c7fffeffff 83ff1d }
$sequence_20 = { 4885c0 7523 488b0b ff15???????? }
$sequence_21 = { 4885c9 7504 33c0 eb43 ff15???????? 8d7001 }
condition:
7 of them and filesize < 1027072
}
Strings (22 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 6a01 ff35???????? 6a04 6a01 50 } | |
| $sequence_1 | hex | { 6a00 6a00 e8???????? 50 ff15???????? } | |
| $sequence_2 | hex | { e8???????? 837d1040 752d 8b4d04 e8???????? 85c0 7421 } | |
| $sequence_3 | hex | { ba00ff0000 8bc1 23c2 3bc2 } | |
| $sequence_4 | hex | { 69d26d4ec641 81c239300000 2ac2 8801 } | |
| $sequence_5 | hex | { 0fb6c9 81c900ff0000 e8???????? 85c0 } | |
| $sequence_6 | hex | { ff15???????? a3???????? 85c0 74e7 } | |
| $sequence_7 | hex | { 7528 68???????? ff15???????? 85c0 7504 } | |
| $sequence_8 | hex | { 6a08 68???????? 56 ffd7 85c0 } | |
| $sequence_9 | hex | { e8???????? 33d2 b9ff3f0000 f7f1 } | |
| $sequence_10 | hex | { 59 57 8bf0 ff15???????? 8bc6 } | |
| $sequence_11 | hex | { 8bc6 8703 3bc6 74f8 } | |
| $sequence_12 | hex | { eb04 8b01 8907 e8???????? } | |
| $sequence_13 | hex | { ff750c ff7508 e8???????? 83c40c 8d45fc } | |
| $sequence_14 | hex | { f3aa 5f 5d c3 55 8bec 51 } | |
| $sequence_15 | hex | { c1e910 e9???????? 8ac1 c1e904 c0e004 } | |
| $sequence_16 | hex | { 8ac8 240f 80e1f0 80c110 } | |
| $sequence_17 | hex | { 3c41 7c11 3c46 7f0d } | |
| $sequence_18 | hex | { 488364242000 4c8d442430 4533c9 33d2 c744243001000000 c744243c02000000 } | |
| $sequence_19 | hex | { 40883c08 ff430c e9???????? 0f86bf000000 81c7fffeffff 83ff1d } | |
| $sequence_20 | hex | { 4885c0 7523 488b0b ff15???????? } | |
| $sequence_21 | hex | { 4885c9 7504 33c0 eb43 ff15???????? 8d7001 } |
Condition
7 of them and filesize < 1027072In plain words (Heuristic)
- The file must be smaller than 1027072 (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: 779e17e2-0a5b-503c-9ec0-b238e6b49565
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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