YARA · Malpedia signator rules
MALPEDIA_Win_Bs2005_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: Bs2005.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-bs2005-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Bs2005_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "c4befd31-9531-5de2-aa5e-ea082e375341"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.bs2005"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.bs2005_auto.yar#L1-L121"
= "N/A"
= "190262bb63093685e83b8f09df7185445a30ae67220a772f1f0045c2ececafe5"
= 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 = { 53 68???????? 57 ff15???????? 8bc7 83c418 8d4801 }
$sequence_1 = { 5d c3 8d5a9f 80fb19 771c 0fbeca }
$sequence_2 = { 898844000400 8b974c060000 8b02 c6404037 8b8f54060000 }
$sequence_3 = { 52 6a04 50 8945e4 8b45e8 68???????? 50 }
$sequence_4 = { 40 84c9 75f9 8b8f4c060000 2bc2 }
$sequence_5 = { 52 e8???????? 8b4dfc 83c40c 50 }
$sequence_6 = { c1f918 884cb5ec 8bd0 8bc8 c1fa10 c1f908 8854b5ed }
$sequence_7 = { ffd2 8b06 8b08 8b5108 }
$sequence_8 = { e8???????? 8d8f14010000 8bc1 83c40c 8d7001 8bff 8a10 }
$sequence_9 = { 85c0 749c 8b55cc 52 }
condition:
7 of them and filesize < 212992
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 53 68???????? 57 ff15???????? 8bc7 83c418 8d4801 } | |
| $sequence_1 | hex | { 5d c3 8d5a9f 80fb19 771c 0fbeca } | |
| $sequence_2 | hex | { 898844000400 8b974c060000 8b02 c6404037 8b8f54060000 } | |
| $sequence_3 | hex | { 52 6a04 50 8945e4 8b45e8 68???????? 50 } | |
| $sequence_4 | hex | { 40 84c9 75f9 8b8f4c060000 2bc2 } | |
| $sequence_5 | hex | { 52 e8???????? 8b4dfc 83c40c 50 } | |
| $sequence_6 | hex | { c1f918 884cb5ec 8bd0 8bc8 c1fa10 c1f908 8854b5ed } | |
| $sequence_7 | hex | { ffd2 8b06 8b08 8b5108 } | |
| $sequence_8 | hex | { e8???????? 8d8f14010000 8bc1 83c40c 8d7001 8bff 8a10 } | |
| $sequence_9 | hex | { 85c0 749c 8b55cc 52 } |
Condition
7 of them and filesize < 212992In plain words (Heuristic)
- The file must be smaller than 212992 (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: c4befd31-9531-5de2-aa5e-ea082e375341
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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