YARA · Malpedia signator rules
MALPEDIA_Win_Kutaki_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: Kutaki.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-kutaki-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Kutaki_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "48e743da-b335-5755-b568-4eed1a0848ba"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.kutaki"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.kutaki_auto.yar#L1-L131"
= "N/A"
= "f1fa7380a50e2743cedeaaa0693c41429b0def91858704e16479700f8e6c6e01"
= 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 = { e9???????? c745fc0a000000 c745fc0b000000 8b450c 6bc004 0f8037080000 83c002 }
$sequence_1 = { 83bd80feffff00 7d26 68a0000000 68???????? 8b9584feffff 52 8b8580feffff }
$sequence_2 = { 8d4de0 ff15???????? 8b4d08 6a00 8b11 8955c4 ffd3 }
$sequence_3 = { c7458c00000000 8b4d8c f7d9 66894db4 8d4ddc ff15???????? 8d4dd4 }
$sequence_4 = { ff15???????? 898584fcffff eb0a c78584fcffff00000000 8b9574ffffff 899564fdffff c78574ffffff00000000 }
$sequence_5 = { 66833801 7543 8b4dac 8b55d8 2b5114 899554ffffff }
$sequence_6 = { 8d9574ffffff 8d4da4 ff15???????? 8b4dc8 898d20ffffff c745c800000000 }
$sequence_7 = { 8d4598 52 50 6a03 ff15???????? 83c41c 68???????? }
$sequence_8 = { 51 ff15???????? 8d8d3cffffff ff15???????? c745fc0a000000 83bd68ffffff00 }
$sequence_9 = { e9???????? c745fc34000000 8d45ac 50 e8???????? 8bd0 8d4da8 }
condition:
7 of them and filesize < 1335296
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { e9???????? c745fc0a000000 c745fc0b000000 8b450c 6bc004 0f8037080000 83c002 } | |
| $sequence_1 | hex | { 83bd80feffff00 7d26 68a0000000 68???????? 8b9584feffff 52 8b8580feffff } | |
| $sequence_2 | hex | { 8d4de0 ff15???????? 8b4d08 6a00 8b11 8955c4 ffd3 } | |
| $sequence_3 | hex | { c7458c00000000 8b4d8c f7d9 66894db4 8d4ddc ff15???????? 8d4dd4 } | |
| $sequence_4 | hex | { ff15???????? 898584fcffff eb0a c78584fcffff00000000 8b9574ffffff 899564fdffff c78574ffffff00000000 } | |
| $sequence_5 | hex | { 66833801 7543 8b4dac 8b55d8 2b5114 899554ffffff } | |
| $sequence_6 | hex | { 8d9574ffffff 8d4da4 ff15???????? 8b4dc8 898d20ffffff c745c800000000 } | |
| $sequence_7 | hex | { 8d4598 52 50 6a03 ff15???????? 83c41c 68???????? } | |
| $sequence_8 | hex | { 51 ff15???????? 8d8d3cffffff ff15???????? c745fc0a000000 83bd68ffffff00 } | |
| $sequence_9 | hex | { e9???????? c745fc34000000 8d45ac 50 e8???????? 8bd0 8d4da8 } |
Condition
7 of them and filesize < 1335296In plain words (Heuristic)
- The file must be smaller than 1335296 (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: 48e743da-b335-5755-b568-4eed1a0848ba
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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