YARA · Malpedia signator rules
MALPEDIA_Win_Chches_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: Chches.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-chches-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Chches_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "d1e3b20f-e743-53e1-ac6e-215947ccb2a0"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.chches"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.chches_auto.yar#L1-L130"
= "N/A"
= "f824466dcad6d2ffdf6fb769e15d5dc2ca63b4ccfc42a7ff22172ad6dbf0523c"
= 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 = { 745a 50 8b4660 ffd0 8b0e }
$sequence_1 = { 8b550c 8b4508 8b8ec0000000 53 6880000000 52 53 }
$sequence_2 = { 8bf0 85f6 7404 c60600 46 803b00 7424 }
$sequence_3 = { 3bc3 7412 8b5644 50 53 ffd2 50 }
$sequence_4 = { 33ff 33c0 81c61d051101 897df0 8945ec 3bcf }
$sequence_5 = { 746f 50 8b4664 ffd0 8b4c3bfc 8b4910 03c0 }
$sequence_6 = { 8b45fc 8903 8b4d10 8b45f4 894b08 8b97c4000000 8b4df0 }
$sequence_7 = { 03c0 8945ec 8d441001 2bf0 8945d8 03f3 }
$sequence_8 = { 8b17 894214 8b4508 8b4814 8b17 8b4214 53 }
$sequence_9 = { e8???????? 8b75fc 83c408 8bd8 85f6 7507 8b4f74 }
condition:
7 of them and filesize < 122880
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 745a 50 8b4660 ffd0 8b0e } | |
| $sequence_1 | hex | { 8b550c 8b4508 8b8ec0000000 53 6880000000 52 53 } | |
| $sequence_2 | hex | { 8bf0 85f6 7404 c60600 46 803b00 7424 } | |
| $sequence_3 | hex | { 3bc3 7412 8b5644 50 53 ffd2 50 } | |
| $sequence_4 | hex | { 33ff 33c0 81c61d051101 897df0 8945ec 3bcf } | |
| $sequence_5 | hex | { 746f 50 8b4664 ffd0 8b4c3bfc 8b4910 03c0 } | |
| $sequence_6 | hex | { 8b45fc 8903 8b4d10 8b45f4 894b08 8b97c4000000 8b4df0 } | |
| $sequence_7 | hex | { 03c0 8945ec 8d441001 2bf0 8945d8 03f3 } | |
| $sequence_8 | hex | { 8b17 894214 8b4508 8b4814 8b17 8b4214 53 } | |
| $sequence_9 | hex | { e8???????? 8b75fc 83c408 8bd8 85f6 7507 8b4f74 } |
Condition
7 of them and filesize < 122880In plain words (Heuristic)
- The file must be smaller than 122880 (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: d1e3b20f-e743-53e1-ac6e-215947ccb2a0
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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