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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:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "f7c02e27-ba73-5133-9156-20f0be211722"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.leouncia"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.leouncia_auto.yar#L1-L123"
		license_url = "N/A"
		logic_hash = "f147dd4474ec4546834e294cf16c0550dfa8fd999171c414938a0c4472591a15"
		score = 75
		quality = 75
		tags = "FILE"
		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"

	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)

IdentifierTypeValueModifiers
$sequence_0hex{ 8bf7 c1f805 83e61f 8d1c8560c14000 c1e603 8b03 f644300401 }
$sequence_1hex{ c1e602 8b86f0a64000 eb09 c1e602 8b8624a74000 }
$sequence_2hex{ c744244c01000000 ffd7 85c0 750e 5f 5e 5d }
$sequence_3hex{ 8bc1 8bf1 c1f805 83e61f 8d1c8560c14000 c1e603 8b03 }
$sequence_4hex{ 7229 f3a5 ff249548734000 8bc7 ba03000000 83e904 720c }
$sequence_5hex{ 83c40c 80bc242401000063 7510 8d942425010000 52 }
$sequence_6hex{ 52 e8???????? 8be8 8d842448010000 50 }
$sequence_7hex{ c1e902 f3a5 8bca 83e103 f3a4 c644041800 }
$sequence_8hex{ 8bca 83e103 f3aa 017500 }
$sequence_9hex{ 47 50 897d00 c744241800040000 ff15???????? 85c0 }

Condition

7 of them and filesize < 114688

In 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.

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References

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)

Original rule

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

version1
toolyara-signator v0.6.0
signator_configcallsandjumps;datarefs;binvalue
malpedia_rule_date20260422
malpedia_hasha182e35da64e6d71cb55f125c4d4225196523f14
malpedia_version20260504
malpedia_licenseCC BY-SA 4.0
malpedia_sharingTLP:WHITE

Tags:FILE