YARA · Malpedia signator rules
MALPEDIA_Win_Kuaibu8_Auto
autogenerated rule brought to you by yara-signator
MalwareKuaibu8Malpedia 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: Kuaibu8.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-kuaibu8-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Kuaibu8_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "677a7b27-8dba-50f8-a903-d3ae3dd1454a"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.kuaibu8"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.kuaibu8_auto.yar#L1-L132"
= "N/A"
= "0baf0af63f21cd612a4fdefb8c0477dd54dc083c1e606251e564162b27012807"
= 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 = { 7404 3c5c 7503 c60100 8d8c2410010000 51 e8???????? }
$sequence_1 = { 8b9698160000 8b4c2414 42 899698160000 81e1ff000000 33d2 8a91e08b4300 }
$sequence_2 = { 5b 81c440030000 c21000 3b7810 7d09 50 e8???????? }
$sequence_3 = { 83c404 e9???????? 8965f0 ff75fc ff15???????? 90 90 }
$sequence_4 = { 8945ec 6804000080 6a00 68???????? 6804000080 6a00 a1???????? }
$sequence_5 = { 50 56 e8???????? 5e 81c40c010000 c3 b8fdffffff }
$sequence_6 = { 51 c1e810 50 899524010000 e8???????? 83c408 }
$sequence_7 = { 0f8406000000 8bca 33c0 f3ab ff75fc e8???????? 83c404 }
$sequence_8 = { 8d942454020000 68???????? 52 e8???????? 8d44242c 50 6a00 }
$sequence_9 = { 33d2 8a90e08a4300 8bc2 66ff848680090000 8b8694160000 8b8e98160000 }
condition:
7 of them and filesize < 737280
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 7404 3c5c 7503 c60100 8d8c2410010000 51 e8???????? } | |
| $sequence_1 | hex | { 8b9698160000 8b4c2414 42 899698160000 81e1ff000000 33d2 8a91e08b4300 } | |
| $sequence_2 | hex | { 5b 81c440030000 c21000 3b7810 7d09 50 e8???????? } | |
| $sequence_3 | hex | { 83c404 e9???????? 8965f0 ff75fc ff15???????? 90 90 } | |
| $sequence_4 | hex | { 8945ec 6804000080 6a00 68???????? 6804000080 6a00 a1???????? } | |
| $sequence_5 | hex | { 50 56 e8???????? 5e 81c40c010000 c3 b8fdffffff } | |
| $sequence_6 | hex | { 51 c1e810 50 899524010000 e8???????? 83c408 } | |
| $sequence_7 | hex | { 0f8406000000 8bca 33c0 f3ab ff75fc e8???????? 83c404 } | |
| $sequence_8 | hex | { 8d942454020000 68???????? 52 e8???????? 8d44242c 50 6a00 } | |
| $sequence_9 | hex | { 33d2 8a90e08a4300 8bc2 66ff848680090000 8b8694160000 8b8e98160000 } |
Condition
7 of them and filesize < 737280In plain words (Heuristic)
- The file must be smaller than 737280 (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: 677a7b27-8dba-50f8-a903-d3ae3dd1454a
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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