YARA · Malpedia signator rules
MALPEDIA_Win_Bitsran_Auto
autogenerated rule brought to you by yara-signator
MalwareBitsranMalpedia 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: Bitsran.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-bitsran-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Bitsran_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "16c55ef7-ea38-5a6e-9b03-3ffbc1490773"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.bitsran"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.bitsran_auto.yar#L1-L126"
= "N/A"
= "66ad634ce1f4bbbfe736e731a2362905372751f8a16d7a77b20768e031217360"
= 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 = { 740a 8b85f4feffff 56 50 eb3a 8b0d???????? 8b15???????? }
$sequence_1 = { 8bbdf4feffff 8d4701 50 e8???????? 57 }
$sequence_2 = { 85c0 7403 8975fc 837dfc00 }
$sequence_3 = { e8???????? 8be5 5d c3 57 8bff 33c9 }
$sequence_4 = { c1f905 8b0c8da01f4200 83e21f c1e206 385c1104 7506 4e }
$sequence_5 = { 7509 c743186c5d4100 eb11 83fefc 740c c743184c5d4100 }
$sequence_6 = { 66894ddc ff15???????? 83f801 753b 8b4d0c 8b55f0 69c9e8030000 }
$sequence_7 = { 83c408 85c0 7403 8975fc 8b03 8d55cc 52 }
$sequence_8 = { 8bc1 c1f805 8bf1 83e61f 8d3c85a01f4200 }
$sequence_9 = { 8935???????? ff15???????? 50 e8???????? 8bf7 2bf3 c1fe02 }
condition:
7 of them and filesize < 344064
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 740a 8b85f4feffff 56 50 eb3a 8b0d???????? 8b15???????? } | |
| $sequence_1 | hex | { 8bbdf4feffff 8d4701 50 e8???????? 57 } | |
| $sequence_2 | hex | { 85c0 7403 8975fc 837dfc00 } | |
| $sequence_3 | hex | { e8???????? 8be5 5d c3 57 8bff 33c9 } | |
| $sequence_4 | hex | { c1f905 8b0c8da01f4200 83e21f c1e206 385c1104 7506 4e } | |
| $sequence_5 | hex | { 7509 c743186c5d4100 eb11 83fefc 740c c743184c5d4100 } | |
| $sequence_6 | hex | { 66894ddc ff15???????? 83f801 753b 8b4d0c 8b55f0 69c9e8030000 } | |
| $sequence_7 | hex | { 83c408 85c0 7403 8975fc 8b03 8d55cc 52 } | |
| $sequence_8 | hex | { 8bc1 c1f805 8bf1 83e61f 8d3c85a01f4200 } | |
| $sequence_9 | hex | { 8935???????? ff15???????? 50 e8???????? 8bf7 2bf3 c1fe02 } |
Condition
7 of them and filesize < 344064In plain words (Heuristic)
- The file must be smaller than 344064 (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: 16c55ef7-ea38-5a6e-9b03-3ffbc1490773
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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