YARA · Malpedia signator rules
MALPEDIA_Win_Buhtrap_Auto
autogenerated rule brought to you by yara-signator
MalwareBuhtrapMalpedia 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: Buhtrap.
It defines 15 patterns (0 text, 15 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-buhtrap-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Buhtrap_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "ec0d633d-f726-5533-a1eb-663afc320fe0"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.buhtrap"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.buhtrap_auto.yar#L1-L160"
= "N/A"
= "ed60490c21bc1b3352b78afbc750c7d4550d0a80c764f1584e5e48f6256ee492"
= 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 = { 59 59 84c0 0f8435010000 }
$sequence_1 = { 8bec 81ec10010000 803d????????00 7407 32c0 e9???????? 8b450c }
$sequence_2 = { 50 6a1e 5a e8???????? 8d542420 8bc8 }
$sequence_3 = { 740f 8a10 80fa5c 7405 }
$sequence_4 = { 744d 8b5dfc b9???????? 6a04 5a e8???????? 8bc8 }
$sequence_5 = { 8bec 83e4f8 81ec44030000 53 56 57 33db }
$sequence_6 = { ab 8d55d8 6a00 6a00 52 ab }
$sequence_7 = { 881d???????? ebde 55 8bec 81ec0c010000 }
$sequence_8 = { 0f8487000000 2df5010000 743f 83e805 }
$sequence_9 = { 83c414 53 ff7510 8945fc 8b4514 ff750c }
$sequence_10 = { ff770c ff750c 50 ff15???????? eb06 }
$sequence_11 = { 8d45fc 50 53 6a01 ff750c 897dfc }
$sequence_12 = { 6a08 68???????? e8???????? 33f6 8975fc 397508 }
$sequence_13 = { 6854ca559f 6a02 68???????? 890e }
$sequence_14 = { e8???????? 59 894638 ff7708 }
condition:
7 of them and filesize < 131072
}
Strings (15 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 59 59 84c0 0f8435010000 } | |
| $sequence_1 | hex | { 8bec 81ec10010000 803d????????00 7407 32c0 e9???????? 8b450c } | |
| $sequence_2 | hex | { 50 6a1e 5a e8???????? 8d542420 8bc8 } | |
| $sequence_3 | hex | { 740f 8a10 80fa5c 7405 } | |
| $sequence_4 | hex | { 744d 8b5dfc b9???????? 6a04 5a e8???????? 8bc8 } | |
| $sequence_5 | hex | { 8bec 83e4f8 81ec44030000 53 56 57 33db } | |
| $sequence_6 | hex | { ab 8d55d8 6a00 6a00 52 ab } | |
| $sequence_7 | hex | { 881d???????? ebde 55 8bec 81ec0c010000 } | |
| $sequence_8 | hex | { 0f8487000000 2df5010000 743f 83e805 } | |
| $sequence_9 | hex | { 83c414 53 ff7510 8945fc 8b4514 ff750c } | |
| $sequence_10 | hex | { ff770c ff750c 50 ff15???????? eb06 } | |
| $sequence_11 | hex | { 8d45fc 50 53 6a01 ff750c 897dfc } | |
| $sequence_12 | hex | { 6a08 68???????? e8???????? 33f6 8975fc 397508 } | |
| $sequence_13 | hex | { 6854ca559f 6a02 68???????? 890e } | |
| $sequence_14 | hex | { e8???????? 59 894638 ff7708 } |
Condition
7 of them and filesize < 131072In plain words (Heuristic)
- The file must be smaller than 131072 (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: ec0d633d-f726-5533-a1eb-663afc320fe0
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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