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MALPEDIA_Win_Gcman_Auto

autogenerated rule brought to you by yara-signator

MalwareGcmanMalpedia 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: Gcman.

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

Summary generated from the rule's metadata and condition.

Rule source

win-gcman-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Gcman_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "8224ea9b-cee2-5e48-9bd4-a2a5010f2b30"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.gcman"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.gcman_auto.yar#L1-L121"
		license_url = "N/A"
		logic_hash = "4cf582ce3815e6490fdc2c444f74be071ece657cca140e110f40f7d491c65c14"
		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 = { c745fc00000000 8b4508 803800 0f8487000000 }
		$sequence_1 = { ff00 837dec01 7443 837dec01 7f0b 837dec00 }
		$sequence_2 = { 8b04d5e4504000 ffd0 8945fc c745f401000000 eb07 }
		$sequence_3 = { 8d45f4 ff00 ebe7 8b45f4 803800 }
		$sequence_4 = { e9???????? 837d0c00 0f8e94000000 8b4dfc }
		$sequence_5 = { 09de 31c6 0375c0 01f1 81e9ecbcfe5c }
		$sequence_6 = { 7513 8d85d8ebffff 890424 e8???????? a3???????? 8b8590eaffff 89442408 }
		$sequence_7 = { 8902 8b5508 83c20c 8b4508 83c00c 8b00 01d8 }
		$sequence_8 = { 0385f4efffff 89442404 8b85e0efffff 890424 e8???????? 83ec14 8b85ecefffff }
		$sequence_9 = { 40 890424 e8???????? 8945fc 8b45fc 89442408 8b450c }

	condition:
		7 of them and filesize < 81920
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ c745fc00000000 8b4508 803800 0f8487000000 }
$sequence_1hex{ ff00 837dec01 7443 837dec01 7f0b 837dec00 }
$sequence_2hex{ 8b04d5e4504000 ffd0 8945fc c745f401000000 eb07 }
$sequence_3hex{ 8d45f4 ff00 ebe7 8b45f4 803800 }
$sequence_4hex{ e9???????? 837d0c00 0f8e94000000 8b4dfc }
$sequence_5hex{ 09de 31c6 0375c0 01f1 81e9ecbcfe5c }
$sequence_6hex{ 7513 8d85d8ebffff 890424 e8???????? a3???????? 8b8590eaffff 89442408 }
$sequence_7hex{ 8902 8b5508 83c20c 8b4508 83c00c 8b00 01d8 }
$sequence_8hex{ 0385f4efffff 89442404 8b85e0efffff 890424 e8???????? 83ec14 8b85ecefffff }
$sequence_9hex{ 40 890424 e8???????? 8945fc 8b45fc 89442408 8b450c }

Condition

7 of them and filesize < 81920

In plain words (Heuristic)

  • The file must be smaller than 81920 (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: 8224ea9b-cee2-5e48-9bd4-a2a5010f2b30

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