YARA · Malpedia signator rules
MALPEDIA_Win_Leouncia_Auto
autogenerated rule brought to you by yara-signator
MalwareLeounciaMalpedia 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: Leouncia.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-leouncia-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Leouncia_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "f7c02e27-ba73-5133-9156-20f0be211722"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.leouncia"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.leouncia_auto.yar#L1-L123"
= "N/A"
= "f147dd4474ec4546834e294cf16c0550dfa8fd999171c414938a0c4472591a15"
= 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 = { 8bf7 c1f805 83e61f 8d1c8560c14000 c1e603 8b03 f644300401 }
$sequence_1 = { c1e602 8b86f0a64000 eb09 c1e602 8b8624a74000 }
$sequence_2 = { c744244c01000000 ffd7 85c0 750e 5f 5e 5d }
$sequence_3 = { 8bc1 8bf1 c1f805 83e61f 8d1c8560c14000 c1e603 8b03 }
$sequence_4 = { 7229 f3a5 ff249548734000 8bc7 ba03000000 83e904 720c }
$sequence_5 = { 83c40c 80bc242401000063 7510 8d942425010000 52 }
$sequence_6 = { 52 e8???????? 8be8 8d842448010000 50 }
$sequence_7 = { c1e902 f3a5 8bca 83e103 f3a4 c644041800 }
$sequence_8 = { 8bca 83e103 f3aa 017500 }
$sequence_9 = { 47 50 897d00 c744241800040000 ff15???????? 85c0 }
condition:
7 of them and filesize < 114688
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 8bf7 c1f805 83e61f 8d1c8560c14000 c1e603 8b03 f644300401 } | |
| $sequence_1 | hex | { c1e602 8b86f0a64000 eb09 c1e602 8b8624a74000 } | |
| $sequence_2 | hex | { c744244c01000000 ffd7 85c0 750e 5f 5e 5d } | |
| $sequence_3 | hex | { 8bc1 8bf1 c1f805 83e61f 8d1c8560c14000 c1e603 8b03 } | |
| $sequence_4 | hex | { 7229 f3a5 ff249548734000 8bc7 ba03000000 83e904 720c } | |
| $sequence_5 | hex | { 83c40c 80bc242401000063 7510 8d942425010000 52 } | |
| $sequence_6 | hex | { 52 e8???????? 8be8 8d842448010000 50 } | |
| $sequence_7 | hex | { c1e902 f3a5 8bca 83e103 f3a4 c644041800 } | |
| $sequence_8 | hex | { 8bca 83e103 f3aa 017500 } | |
| $sequence_9 | hex | { 47 50 897d00 c744241800040000 ff15???????? 85c0 } |
Condition
7 of them and filesize < 114688In plain words (Heuristic)
- The file must be smaller than 114688 (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: f7c02e27-ba73-5133-9156-20f0be211722
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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