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MALPEDIA_Win_Webc2_Ugx_Auto

autogenerated rule brought to you by yara-signator

MalwareWebc2 UgxMalpedia 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 Ugx.

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

Summary generated from the rule's metadata and condition.

Rule source

win-webc2-ugx-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Webc2_Ugx_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "7a191507-05f1-515e-ae93-69990858de4e"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.webc2_ugx"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.webc2_ugx_auto.yar#L1-L123"
		license_url = "N/A"
		logic_hash = "da5aed5a4142e6d6386e692fafe9cfc551187544798ccc57d23b8cb2bec2ee67"
		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 = { ff969c060000 3bc3 89458c 0f8497030000 }
		$sequence_1 = { 57 ff969c060000 3bc3 8945d8 0f8487020000 }
		$sequence_2 = { 50 ff7508 ff969c060000 3bc3 8945bc 0f84a2040000 8b7db4 }
		$sequence_3 = { ff55c0 57 ff55f8 ff55e8 }
		$sequence_4 = { 50 e8???????? 6a01 6a10 57 68420d0000 }
		$sequence_5 = { aa 33c0 8d7d9d 885d9c c645d47a ab ab }
		$sequence_6 = { 50 ff15???????? 85c0 7455 8d85a8feffff }
		$sequence_7 = { 8d86a4080000 50 57 ff969c060000 3bc3 894594 0f84a7020000 }
		$sequence_8 = { f3ab 66ab aa 33c0 8d7de9 885de8 8b7508 }
		$sequence_9 = { e9???????? 8d86ae090000 50 57 ff969c060000 3bc3 8945c0 }

	condition:
		7 of them and filesize < 57344
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ ff969c060000 3bc3 89458c 0f8497030000 }
$sequence_1hex{ 57 ff969c060000 3bc3 8945d8 0f8487020000 }
$sequence_2hex{ 50 ff7508 ff969c060000 3bc3 8945bc 0f84a2040000 8b7db4 }
$sequence_3hex{ ff55c0 57 ff55f8 ff55e8 }
$sequence_4hex{ 50 e8???????? 6a01 6a10 57 68420d0000 }
$sequence_5hex{ aa 33c0 8d7d9d 885d9c c645d47a ab ab }
$sequence_6hex{ 50 ff15???????? 85c0 7455 8d85a8feffff }
$sequence_7hex{ 8d86a4080000 50 57 ff969c060000 3bc3 894594 0f84a7020000 }
$sequence_8hex{ f3ab 66ab aa 33c0 8d7de9 885de8 8b7508 }
$sequence_9hex{ e9???????? 8d86ae090000 50 57 ff969c060000 3bc3 8945c0 }

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: 7a191507-05f1-515e-ae93-69990858de4e

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