YARA · Malpedia signator rules
MALPEDIA_Win_Decaf_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: Decaf.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-decaf-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Decaf_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "688421e5-50f3-54a6-afcf-ed3cc43c3379"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.decaf"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.decaf_auto.yar#L1-L134"
= "N/A"
= "bc13d1aabe60e36a979a1ab19aaf3f220b675ec157b071ae53bdc10a73fed48d"
= 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 = { eb14 488d7818 488b8c2448200000 0f1f00 e8???????? 488b8c24d0050000 48894808 }
$sequence_1 = { 488d0d69f20800 488908 488d0d02080c00 48890d???????? 833d????????00 7509 488905???????? }
$sequence_2 = { 488d05ac221c00 bb27000000 e8???????? 488d05f3111c00 bb20000000 e8???????? 48ffc1 }
$sequence_3 = { e8???????? e8???????? 4889842430110000 48899c2470020000 90 488d050a9d0c00 e8???????? }
$sequence_4 = { bb19000000 e8???????? 488d053fcd1900 bb1c000000 e8???????? 90 4889442408 }
$sequence_5 = { e8???????? 488d0554a41400 488b5c2438 488d0d28ff1600 bf07000000 0f1f00 e8???????? }
$sequence_6 = { 663913 754e 0fb75002 66395302 7544 4889442428 48895c2430 }
$sequence_7 = { e8???????? 488d3de3581f00 e8???????? e8???????? 48898424f8100000 48899c24200a0000 488b0d???????? }
$sequence_8 = { c6041ff9 31c9 e9???????? 4983f806 754b 4c8d4301 4c39c6 }
$sequence_9 = { 488d6c2430 48ba059ac5d4c613bccd 4889542425 48bad4c613bccd3f86c5 4889542428 48ba46f582b1b25cdea7 488954241a }
condition:
7 of them and filesize < 7193600
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { eb14 488d7818 488b8c2448200000 0f1f00 e8???????? 488b8c24d0050000 48894808 } | |
| $sequence_1 | hex | { 488d0d69f20800 488908 488d0d02080c00 48890d???????? 833d????????00 7509 488905???????? } | |
| $sequence_2 | hex | { 488d05ac221c00 bb27000000 e8???????? 488d05f3111c00 bb20000000 e8???????? 48ffc1 } | |
| $sequence_3 | hex | { e8???????? e8???????? 4889842430110000 48899c2470020000 90 488d050a9d0c00 e8???????? } | |
| $sequence_4 | hex | { bb19000000 e8???????? 488d053fcd1900 bb1c000000 e8???????? 90 4889442408 } | |
| $sequence_5 | hex | { e8???????? 488d0554a41400 488b5c2438 488d0d28ff1600 bf07000000 0f1f00 e8???????? } | |
| $sequence_6 | hex | { 663913 754e 0fb75002 66395302 7544 4889442428 48895c2430 } | |
| $sequence_7 | hex | { e8???????? 488d3de3581f00 e8???????? e8???????? 48898424f8100000 48899c24200a0000 488b0d???????? } | |
| $sequence_8 | hex | { c6041ff9 31c9 e9???????? 4983f806 754b 4c8d4301 4c39c6 } | |
| $sequence_9 | hex | { 488d6c2430 48ba059ac5d4c613bccd 4889542425 48bad4c613bccd3f86c5 4889542428 48ba46f582b1b25cdea7 488954241a } |
Condition
7 of them and filesize < 7193600In plain words (Heuristic)
- The file must be smaller than 7193600 (a cheap guard that skips large files).
- At least 7 patterns in the rule must match.
Test this rule in your browser
Drop a file to scan it with this rule using YARA-X compiled to WebAssembly. Nothing is uploaded.
Drop a file here or click to chooseScanned locally with YARA-X. Files up to 200 MB.
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: 688421e5-50f3-54a6-afcf-ed3cc43c3379
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
Related rules
- MalwareditekSHen detection· ditekSHen· 2020-11-06
- ARKBIRD_SOLG_RAN_Decaf_Nov_2021_1Metadata onlyMalwareArkbird SOLG (DailyIOC)· Arkbird_SOLG· 2021-11-01
- Suspicious / huntingditekSHen detection· ditekShen· 2021-01-21
- MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04
- MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04
- MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04
- MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04
- MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04