YARA · Malpedia signator rules
MALPEDIA_Win_Cotx_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: Cotx.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-cotx-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Cotx_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "dc4ec83b-2cb5-5d9d-921f-92f64e164cb9"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.cotx"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.cotx_auto.yar#L1-L129"
= "N/A"
= "66a0f678779c542cab0386555a0b8bd37d55428900fb460307d314271aafd36b"
= 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 = { 897704 0fb74316 c1e80d 83e001 894714 0fb74316 }
$sequence_1 = { 0f1185a8faffff c785b8faffff74726f6c 66c785bcfaffff6c65 c685befaffff72 e8???????? 83c424 ff15???????? }
$sequence_2 = { 83c438 8d8500f8ffff 6a00 50 68???????? ff15???????? 8b0d???????? }
$sequence_3 = { 84c0 75f8 0f2805???????? 8d85bdfaffff 8bca c785b8faffff39313044 }
$sequence_4 = { c785c8fcffff74726f6c c785ccfcffff6c65722e 66c785d0fcffff6578 c685d2fcffff65 e8???????? 83c448 c785c0fdffff52617354 }
$sequence_5 = { 6800f00000 81c690ef0000 68???????? 56 e8???????? 6800f00000 81c600f00000 }
$sequence_6 = { f3a5 8bca c685bcfaffff2d 68db030000 83e103 0f118598faffff }
$sequence_7 = { f3a4 50 0f1185a8faffff e8???????? 83c40c 8d45a0 6a40 }
$sequence_8 = { ff15???????? 8d85bcf3ffff 50 ff15???????? 8d85bcf3ffff 6a2e 50 }
$sequence_9 = { e8???????? 8b15???????? 8b4dfc a3???????? e8???????? }
condition:
7 of them and filesize < 1171456
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 897704 0fb74316 c1e80d 83e001 894714 0fb74316 } | |
| $sequence_1 | hex | { 0f1185a8faffff c785b8faffff74726f6c 66c785bcfaffff6c65 c685befaffff72 e8???????? 83c424 ff15???????? } | |
| $sequence_2 | hex | { 83c438 8d8500f8ffff 6a00 50 68???????? ff15???????? 8b0d???????? } | |
| $sequence_3 | hex | { 84c0 75f8 0f2805???????? 8d85bdfaffff 8bca c785b8faffff39313044 } | |
| $sequence_4 | hex | { c785c8fcffff74726f6c c785ccfcffff6c65722e 66c785d0fcffff6578 c685d2fcffff65 e8???????? 83c448 c785c0fdffff52617354 } | |
| $sequence_5 | hex | { 6800f00000 81c690ef0000 68???????? 56 e8???????? 6800f00000 81c600f00000 } | |
| $sequence_6 | hex | { f3a5 8bca c685bcfaffff2d 68db030000 83e103 0f118598faffff } | |
| $sequence_7 | hex | { f3a4 50 0f1185a8faffff e8???????? 83c40c 8d45a0 6a40 } | |
| $sequence_8 | hex | { ff15???????? 8d85bcf3ffff 50 ff15???????? 8d85bcf3ffff 6a2e 50 } | |
| $sequence_9 | hex | { e8???????? 8b15???????? 8b4dfc a3???????? e8???????? } |
Condition
7 of them and filesize < 1171456In plain words (Heuristic)
- The file must be smaller than 1171456 (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: dc4ec83b-2cb5-5d9d-921f-92f64e164cb9
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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