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MALPEDIA_Win_Megumin_Auto

autogenerated rule brought to you by yara-signator

MalwareMeguminMalpedia 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: Megumin.

It defines 10 patterns (0 text, 10 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

win-megumin-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Megumin_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "c406e2e6-ad08-5c42-b07a-0d46a0df3645"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.megumin"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.megumin_auto.yar#L1-L134"
		license_url = "N/A"
		logic_hash = "c683aff04bae9dadba06438a1553cc52b63fca2f76e9547da5776897d27f9da7"
		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 = { 83ec18 c645fc2b 8bf4 8965c8 b9???????? 6a0e e8???????? }
		$sequence_1 = { 53 56 57 33f6 c78524f8ffff00000000 56 56 }
		$sequence_2 = { 8d4dd8 e9???????? 8d4db8 e9???????? 8b542408 8d420c 8b8a2cfeffff }
		$sequence_3 = { 8d4dd8 c645fc01 e8???????? 83ec10 8d8dc0fdffff 68???????? e8???????? }
		$sequence_4 = { 8d8d70ffffff c745840f000000 c68570ffffff00 6a07 68???????? e8???????? 8d9570ffffff }
		$sequence_5 = { 53 56 8bf1 57 8b4608 2500010000 7414 }
		$sequence_6 = { 8d8dd4fbffff 6a08 68???????? c785e4fbffff00000000 c785e8fbffff0f000000 c685d4fbffff00 e8???????? }
		$sequence_7 = { 0f82cc0a0000 2bc6 83c9ff 83f8ff 0f42c8 837de810 8d45d4 }
		$sequence_8 = { 8b1f 53 56 e8???????? ff7514 ff75f0 ff75f8 }
		$sequence_9 = { 51 ff7668 e8???????? ff7658 8bce 66c746640000 c6467401 }

	condition:
		7 of them and filesize < 1007616
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 83ec18 c645fc2b 8bf4 8965c8 b9???????? 6a0e e8???????? }
$sequence_1hex{ 53 56 57 33f6 c78524f8ffff00000000 56 56 }
$sequence_2hex{ 8d4dd8 e9???????? 8d4db8 e9???????? 8b542408 8d420c 8b8a2cfeffff }
$sequence_3hex{ 8d4dd8 c645fc01 e8???????? 83ec10 8d8dc0fdffff 68???????? e8???????? }
$sequence_4hex{ 8d8d70ffffff c745840f000000 c68570ffffff00 6a07 68???????? e8???????? 8d9570ffffff }
$sequence_5hex{ 53 56 8bf1 57 8b4608 2500010000 7414 }
$sequence_6hex{ 8d8dd4fbffff 6a08 68???????? c785e4fbffff00000000 c785e8fbffff0f000000 c685d4fbffff00 e8???????? }
$sequence_7hex{ 0f82cc0a0000 2bc6 83c9ff 83f8ff 0f42c8 837de810 8d45d4 }
$sequence_8hex{ 8b1f 53 56 e8???????? ff7514 ff75f0 ff75f8 }
$sequence_9hex{ 51 ff7668 e8???????? ff7658 8bce 66c746640000 c6467401 }

Condition

7 of them and filesize < 1007616

In plain words (Heuristic)

  • The file must be smaller than 1007616 (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: c406e2e6-ad08-5c42-b07a-0d46a0df3645

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