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MALPEDIA_Win_Younglotus_Auto

autogenerated rule brought to you by yara-signator

MalwareYounglotusMalpedia 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: Younglotus.

It defines 16 patterns (0 text, 16 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

win-younglotus-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Younglotus_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "554380af-366d-53a8-8c28-aef30d98c1a4"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.younglotus"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.younglotus_auto.yar#L1-L163"
		license_url = "N/A"
		logic_hash = "aacec19b197e5dcfdea8930de258c96adf4bce4ad48726b17cf7c20f4827ae63"
		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 = { 6802000080 e8???????? 83c41c 6a01 }
		$sequence_1 = { eb02 ebc9 8b45f8 50 }
		$sequence_2 = { ff15???????? 8945d8 68???????? 8b55c8 52 ff15???????? 8945d0 }
		$sequence_3 = { 3419 8b4d08 034dfc 8801 8b5508 }
		$sequence_4 = { 64a100000000 50 64892500000000 81c4d0feffff 53 56 }
		$sequence_5 = { 8d95a8faffff 52 ff15???????? 83c408 }
		$sequence_6 = { 51 68???????? 68???????? ff15???????? 83c408 }
		$sequence_7 = { 8d85f8fdffff 50 68???????? 8d8df8fdffff 51 ff15???????? }
		$sequence_8 = { 53 56 57 68???????? ff15???????? 8945dc 68???????? }
		$sequence_9 = { 8d85e8feffff 68???????? 50 ff15???????? 6a01 }
		$sequence_10 = { 837c240c00 c706???????? 740f ff74240c 68???????? ff15???????? 8b442410 }
		$sequence_11 = { 50 ff15???????? 83c40c 8d85f8fdffff 6a00 }
		$sequence_12 = { 8b35???????? 8365fc00 8bf8 68???????? }
		$sequence_13 = { 8bf8 8b45fc 33c9 6a04 }
		$sequence_14 = { e8???????? 8b45fc 83c40c 80cc10 }
		$sequence_15 = { 51 ffd0 50 ffd3 }

	condition:
		7 of them and filesize < 106496
}

Strings (16 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 6802000080 e8???????? 83c41c 6a01 }
$sequence_1hex{ eb02 ebc9 8b45f8 50 }
$sequence_2hex{ ff15???????? 8945d8 68???????? 8b55c8 52 ff15???????? 8945d0 }
$sequence_3hex{ 3419 8b4d08 034dfc 8801 8b5508 }
$sequence_4hex{ 64a100000000 50 64892500000000 81c4d0feffff 53 56 }
$sequence_5hex{ 8d95a8faffff 52 ff15???????? 83c408 }
$sequence_6hex{ 51 68???????? 68???????? ff15???????? 83c408 }
$sequence_7hex{ 8d85f8fdffff 50 68???????? 8d8df8fdffff 51 ff15???????? }
$sequence_8hex{ 53 56 57 68???????? ff15???????? 8945dc 68???????? }
$sequence_9hex{ 8d85e8feffff 68???????? 50 ff15???????? 6a01 }
$sequence_10hex{ 837c240c00 c706???????? 740f ff74240c 68???????? ff15???????? 8b442410 }
$sequence_11hex{ 50 ff15???????? 83c40c 8d85f8fdffff 6a00 }
$sequence_12hex{ 8b35???????? 8365fc00 8bf8 68???????? }
$sequence_13hex{ 8bf8 8b45fc 33c9 6a04 }
$sequence_14hex{ e8???????? 8b45fc 83c40c 80cc10 }
$sequence_15hex{ 51 ffd0 50 ffd3 }

Condition

7 of them and filesize < 106496

In plain words (Heuristic)

  • The file must be smaller than 106496 (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: 554380af-366d-53a8-8c28-aef30d98c1a4

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