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MALPEDIA_Win_Webc2_Greencat_Auto

autogenerated rule brought to you by yara-signator

MalwareWebc2 GreencatMalpedia 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: Webc2 Greencat.

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

Summary generated from the rule's metadata and condition.

Rule source

win-webc2-greencat-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Webc2_Greencat_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "8ee36097-f75d-5f23-b7c0-2b1501f10d10"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.webc2_greencat"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.webc2_greencat_auto.yar#L1-L124"
		license_url = "N/A"
		logic_hash = "6e607d6af3a17c55b181e1e30c6195baee68c76f9aea2ce264863323620312fb"
		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 = { 59 57 57 56 68???????? 57 57 }
		$sequence_1 = { 83ff05 72db 83ff05 0f849f030000 6800000100 e8???????? }
		$sequence_2 = { 3bc3 59 7445 6a2f 55 885801 }
		$sequence_3 = { c20400 56 8bf1 57 8b3d???????? 8b460c 85c0 }
		$sequence_4 = { e8???????? be24020000 8d859cfbffff 56 53 }
		$sequence_5 = { c645d1f0 c645d2d2 c645d3e6 c645d4e8 c645d540 c645d64a c645d7e6 }
		$sequence_6 = { 59 0f84f8000000 802000 8d85f9fdffff 50 }
		$sequence_7 = { ff750c e8???????? e9???????? 8b4508 53 }
		$sequence_8 = { c6065c 50 ff15???????? 8bf8 8bc7 }
		$sequence_9 = { 53 53 53 53 8d85e0fdffff 6805010000 50 }

	condition:
		7 of them and filesize < 57344
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 59 57 57 56 68???????? 57 57 }
$sequence_1hex{ 83ff05 72db 83ff05 0f849f030000 6800000100 e8???????? }
$sequence_2hex{ 3bc3 59 7445 6a2f 55 885801 }
$sequence_3hex{ c20400 56 8bf1 57 8b3d???????? 8b460c 85c0 }
$sequence_4hex{ e8???????? be24020000 8d859cfbffff 56 53 }
$sequence_5hex{ c645d1f0 c645d2d2 c645d3e6 c645d4e8 c645d540 c645d64a c645d7e6 }
$sequence_6hex{ 59 0f84f8000000 802000 8d85f9fdffff 50 }
$sequence_7hex{ ff750c e8???????? e9???????? 8b4508 53 }
$sequence_8hex{ c6065c 50 ff15???????? 8bf8 8bc7 }
$sequence_9hex{ 53 53 53 53 8d85e0fdffff 6805010000 50 }

Condition

7 of them and filesize < 57344

In plain words (Heuristic)

  • The file must be smaller than 57344 (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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Drop a file here or click to chooseScanned locally with YARA-X. Files up to 200 MB.

Open in editor

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: 8ee36097-f75d-5f23-b7c0-2b1501f10d10

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