YARA · Malpedia signator rules
MALPEDIA_Win_Bravonc_Auto
autogenerated rule brought to you by yara-signator
MalwareBravoncMalpedia 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: Bravonc.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-bravonc-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Bravonc_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "53ec4987-8b1c-52a0-9a77-22ef03d18dfd"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.bravonc"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.bravonc_auto.yar#L1-L127"
= "N/A"
= "654fa8468b7d40e43f12e2cf91d17e0017c1589ce6dc6ec857214f7c1dbfbedb"
= 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 = { 034a38 034dec 8d8401d6c162ca 8945ec e8???????? }
$sequence_1 = { 8b4dec 8d8401a1ebd96e 8945ec e8???????? 8945f4 8b86c0000000 }
$sequence_2 = { 8b8ec0000000 53 ff75fc 894134 e8???????? 8b4df4 }
$sequence_3 = { ff7508 50 e8???????? 8b4dfc 83c40c 8d8578ffffff 50 }
$sequence_4 = { 83450808 ebd0 8b048590b24000 8b4b08 }
$sequence_5 = { c21000 55 8bec 81ec00010000 53 56 ff751c }
$sequence_6 = { e8???????? 8b4df4 334df8 334df0 03c1 8b8ec0000000 034118 }
$sequence_7 = { c20400 c701???????? c3 8b442404 83610c00 894104 8b442408 }
$sequence_8 = { 8945ec 8b86c0000000 6a01 8b4834 33482c 334820 33480c }
$sequence_9 = { 8bf1 8b4604 83f8ff 744c 804dffff 8d4df8 6a04 }
condition:
7 of them and filesize < 131072
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 034a38 034dec 8d8401d6c162ca 8945ec e8???????? } | |
| $sequence_1 | hex | { 8b4dec 8d8401a1ebd96e 8945ec e8???????? 8945f4 8b86c0000000 } | |
| $sequence_2 | hex | { 8b8ec0000000 53 ff75fc 894134 e8???????? 8b4df4 } | |
| $sequence_3 | hex | { ff7508 50 e8???????? 8b4dfc 83c40c 8d8578ffffff 50 } | |
| $sequence_4 | hex | { 83450808 ebd0 8b048590b24000 8b4b08 } | |
| $sequence_5 | hex | { c21000 55 8bec 81ec00010000 53 56 ff751c } | |
| $sequence_6 | hex | { e8???????? 8b4df4 334df8 334df0 03c1 8b8ec0000000 034118 } | |
| $sequence_7 | hex | { c20400 c701???????? c3 8b442404 83610c00 894104 8b442408 } | |
| $sequence_8 | hex | { 8945ec 8b86c0000000 6a01 8b4834 33482c 334820 33480c } | |
| $sequence_9 | hex | { 8bf1 8b4604 83f8ff 744c 804dffff 8d4df8 6a04 } |
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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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: 53ec4987-8b1c-52a0-9a77-22ef03d18dfd
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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