YARA · Malpedia signator rules
MALPEDIA_Win_Vx_Rat_Auto
autogenerated rule brought to you by yara-signator
- 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: Vx Rat.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-vx-rat-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Vx_Rat_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "941970f3-acd1-5d76-a161-eb83ac443b4a"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.vx_rat"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.vx_rat_auto.yar#L1-L122"
= "N/A"
= "6e0437926602f26dec13f159f210507f9809f0c1e755d4de82980349c13c6c34"
= 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 = { 894de8 33f6 8955ec 6a00 50 }
$sequence_1 = { ffb574f7ffff ffd6 e9???????? 80f921 7527 a1???????? 85c0 }
$sequence_2 = { c645fc08 8b9530ffffff c78544ffffff00000000 c78548ffffff07000000 66898534ffffff 83fa08 }
$sequence_3 = { ff742424 ff15???????? e8???????? 85c0 7509 e8???????? }
$sequence_4 = { 8b45e4 0f4355d4 03c0 8b4dac }
$sequence_5 = { b9???????? 8601 6a00 6a00 6a00 56 }
$sequence_6 = { 8d8518f8ffff 50 e8???????? 83c40c eb1d e8???????? }
$sequence_7 = { 8b148d10df4300 0355b0 8a0c03 03d3 43 }
$sequence_8 = { 8d500d a1???????? 8945e8 8bc1 894dec 8955e4 85c9 }
$sequence_9 = { e8???????? c745fcffffffff e9???????? 83c8ff 8b4df4 64890d00000000 }
condition:
7 of them and filesize < 550912
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 894de8 33f6 8955ec 6a00 50 } | |
| $sequence_1 | hex | { ffb574f7ffff ffd6 e9???????? 80f921 7527 a1???????? 85c0 } | |
| $sequence_2 | hex | { c645fc08 8b9530ffffff c78544ffffff00000000 c78548ffffff07000000 66898534ffffff 83fa08 } | |
| $sequence_3 | hex | { ff742424 ff15???????? e8???????? 85c0 7509 e8???????? } | |
| $sequence_4 | hex | { 8b45e4 0f4355d4 03c0 8b4dac } | |
| $sequence_5 | hex | { b9???????? 8601 6a00 6a00 6a00 56 } | |
| $sequence_6 | hex | { 8d8518f8ffff 50 e8???????? 83c40c eb1d e8???????? } | |
| $sequence_7 | hex | { 8b148d10df4300 0355b0 8a0c03 03d3 43 } | |
| $sequence_8 | hex | { 8d500d a1???????? 8945e8 8bc1 894dec 8955e4 85c9 } | |
| $sequence_9 | hex | { e8???????? c745fcffffffff e9???????? 83c8ff 8b4df4 64890d00000000 } |
Condition
7 of them and filesize < 550912In plain words (Heuristic)
- The file must be smaller than 550912 (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: 941970f3-acd1-5d76-a161-eb83ac443b4a
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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