YARA · Malpedia signator rules
MALPEDIA_Win_Sepsys_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: Sepsys.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-sepsys-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Sepsys_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "c12c3537-3fd8-5ecf-8dd9-67f4624ff20f"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.sepsys"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.sepsys_auto.yar#L1-L134"
= "N/A"
= "a2b2408899bb537ebfeb6b18425a18b6df17445171aaa35588bfa6271032b916"
= 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 = { eb43 488b442430 488b4c2470 488908 488b442430 8b4c2478 894808 }
$sequence_1 = { c744244000000800 eb23 837c244001 7d0a c744244000400000 eb12 817c244000040000 }
$sequence_2 = { c645f701 488b4110 488945e0 0f1001 0f2945d0 488b4dc8 e8???????? }
$sequence_3 = { e8???????? 89442420 837c242000 7406 8b442420 eb0c eb08 }
$sequence_4 = { eb00 e8???????? 8845e0 eb00 488b45f8 8a4def 8808 }
$sequence_5 = { e8???????? 4889942418010000 4889842410010000 488b842410010000 4885c0 0f95c1 0fb6d1 }
$sequence_6 = { e8???????? eb54 48837c246000 7421 488b442460 488b8c2488000000 48894828 }
$sequence_7 = { e8???????? 488945b8 eb00 488b4db8 e8???????? 488945b0 eb00 }
$sequence_8 = { 8b442420 25ff000000 8bc8 e8???????? b901000000 486bc902 488b542460 }
$sequence_9 = { eb08 c744246401000000 0fb6442464 88442420 0fb6442420 85c0 7415 }
condition:
7 of them and filesize < 4538368
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { eb43 488b442430 488b4c2470 488908 488b442430 8b4c2478 894808 } | |
| $sequence_1 | hex | { c744244000000800 eb23 837c244001 7d0a c744244000400000 eb12 817c244000040000 } | |
| $sequence_2 | hex | { c645f701 488b4110 488945e0 0f1001 0f2945d0 488b4dc8 e8???????? } | |
| $sequence_3 | hex | { e8???????? 89442420 837c242000 7406 8b442420 eb0c eb08 } | |
| $sequence_4 | hex | { eb00 e8???????? 8845e0 eb00 488b45f8 8a4def 8808 } | |
| $sequence_5 | hex | { e8???????? 4889942418010000 4889842410010000 488b842410010000 4885c0 0f95c1 0fb6d1 } | |
| $sequence_6 | hex | { e8???????? eb54 48837c246000 7421 488b442460 488b8c2488000000 48894828 } | |
| $sequence_7 | hex | { e8???????? 488945b8 eb00 488b4db8 e8???????? 488945b0 eb00 } | |
| $sequence_8 | hex | { 8b442420 25ff000000 8bc8 e8???????? b901000000 486bc902 488b542460 } | |
| $sequence_9 | hex | { eb08 c744246401000000 0fb6442464 88442420 0fb6442420 85c0 7415 } |
Condition
7 of them and filesize < 4538368In plain words (Heuristic)
- The file must be smaller than 4538368 (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: c12c3537-3fd8-5ecf-8dd9-67f4624ff20f
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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