YARA · Malpedia signator rules
MALPEDIA_Win_Koobface_Auto
autogenerated rule brought to you by yara-signator
MalwareKoobfaceMalpedia 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: Koobface.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-koobface-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Koobface_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "c7c8ac2b-27e8-5e1a-9981-867addc45abf"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.koobface"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.koobface_auto.yar#L1-L127"
= "N/A"
= "129b7af91c58c9077cd85117dcfa9c5b55737107a489f23dd03d3a620ffd3880"
= 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 = { 03048da0534200 eb02 8bc2 f6402480 0f8571ffffff 33f6 }
$sequence_1 = { 50 c645fc1e e8???????? 56 8945b4 e8???????? 59 }
$sequence_2 = { 754c 8d8540c1ffff 6a41 50 e8???????? 59 }
$sequence_3 = { 6a02 8985d4c1ffff ff15???????? 8bd8 83ceff 899d84bfffff 3bde }
$sequence_4 = { 55 8bec 8b450c 832000 33c0 40 5d }
$sequence_5 = { 8d3402 56 e8???????? 56 8d45b4 50 8d4d94 }
$sequence_6 = { 8d8528ffffff 68???????? 50 e8???????? 83c40c 8d8528ffffff 50 }
$sequence_7 = { e8???????? c3 55 8bec ff7510 ff750c e8???????? }
$sequence_8 = { 3d???????? 72f1 5d c3 0fb611 }
$sequence_9 = { 57 c645fc04 ff5124 ff7508 }
condition:
7 of them and filesize < 368640
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 03048da0534200 eb02 8bc2 f6402480 0f8571ffffff 33f6 } | |
| $sequence_1 | hex | { 50 c645fc1e e8???????? 56 8945b4 e8???????? 59 } | |
| $sequence_2 | hex | { 754c 8d8540c1ffff 6a41 50 e8???????? 59 } | |
| $sequence_3 | hex | { 6a02 8985d4c1ffff ff15???????? 8bd8 83ceff 899d84bfffff 3bde } | |
| $sequence_4 | hex | { 55 8bec 8b450c 832000 33c0 40 5d } | |
| $sequence_5 | hex | { 8d3402 56 e8???????? 56 8d45b4 50 8d4d94 } | |
| $sequence_6 | hex | { 8d8528ffffff 68???????? 50 e8???????? 83c40c 8d8528ffffff 50 } | |
| $sequence_7 | hex | { e8???????? c3 55 8bec ff7510 ff750c e8???????? } | |
| $sequence_8 | hex | { 3d???????? 72f1 5d c3 0fb611 } | |
| $sequence_9 | hex | { 57 c645fc04 ff5124 ff7508 } |
Condition
7 of them and filesize < 368640In plain words (Heuristic)
- The file must be smaller than 368640 (a cheap guard that skips large files).
- At least 7 patterns in the rule must match.
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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: c7c8ac2b-27e8-5e1a-9981-867addc45abf
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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