YARA · Malpedia signator rules
MALPEDIA_Win_Opachki_Auto
autogenerated rule brought to you by yara-signator
MalwareOpachkiMalpedia 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: Opachki.
It defines 15 patterns (0 text, 15 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-opachki-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Opachki_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "91723bbd-49de-5d2e-9be8-af9d048d21cd"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.opachki"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.opachki_auto.yar#L1-L155"
= "N/A"
= "4aabf4efe9abba6e7cdae995643de9ca627f9e08d6b1e7789a916de78aad53ac"
= 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 = { 7452 8b5204 85d2 744b 2bf0 897508 7441 }
$sequence_1 = { 53 8bd8 7413 8b4704 03c8 53 }
$sequence_2 = { c3 55 8bec 81ec00010000 ff7508 }
$sequence_3 = { ff15???????? 8b450c 8b4808 3bcb 7617 8b4004 53 }
$sequence_4 = { 8bc3 2b45f8 ebf2 55 8bec }
$sequence_5 = { 51 8b450c 56 8b7108 }
$sequence_6 = { 8d4701 50 ff7604 89460c ff15???????? 59 59 }
$sequence_7 = { 6a02 53 53 56 ff15???????? 8b450c }
$sequence_8 = { 7514 08db 7409 80fe06 }
$sequence_9 = { b201 ebc1 3c67 7507 }
$sequence_10 = { 898389838983 898389838585 858585858585 878593859a9a }
$sequence_11 = { f6c140 7412 08d2 7408 }
$sequence_12 = { 4e 80ff01 7504 ac 884717 }
$sequence_13 = { 30ff 08ed 7514 08db }
$sequence_14 = { 7502 b704 4e 80ff01 }
condition:
7 of them and filesize < 122880
}
Strings (15 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 7452 8b5204 85d2 744b 2bf0 897508 7441 } | |
| $sequence_1 | hex | { 53 8bd8 7413 8b4704 03c8 53 } | |
| $sequence_2 | hex | { c3 55 8bec 81ec00010000 ff7508 } | |
| $sequence_3 | hex | { ff15???????? 8b450c 8b4808 3bcb 7617 8b4004 53 } | |
| $sequence_4 | hex | { 8bc3 2b45f8 ebf2 55 8bec } | |
| $sequence_5 | hex | { 51 8b450c 56 8b7108 } | |
| $sequence_6 | hex | { 8d4701 50 ff7604 89460c ff15???????? 59 59 } | |
| $sequence_7 | hex | { 6a02 53 53 56 ff15???????? 8b450c } | |
| $sequence_8 | hex | { 7514 08db 7409 80fe06 } | |
| $sequence_9 | hex | { b201 ebc1 3c67 7507 } | |
| $sequence_10 | hex | { 898389838983 898389838585 858585858585 878593859a9a } | |
| $sequence_11 | hex | { f6c140 7412 08d2 7408 } | |
| $sequence_12 | hex | { 4e 80ff01 7504 ac 884717 } | |
| $sequence_13 | hex | { 30ff 08ed 7514 08db } | |
| $sequence_14 | hex | { 7502 b704 4e 80ff01 } |
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: 91723bbd-49de-5d2e-9be8-af9d048d21cd
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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