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MALPEDIA_Win_Webc2_Qbp_Auto

autogenerated rule brought to you by yara-signator

MalwareWebc2 QbpMalpedia 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 Qbp.

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

Summary generated from the rule's metadata and condition.

Rule source

win-webc2-qbp-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Webc2_Qbp_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "06ba101e-9797-5160-8466-c700bf70efc4"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.webc2_qbp"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.webc2_qbp_auto.yar#L1-L124"
		license_url = "N/A"
		logic_hash = "cb136ce0e6dd81740d74a10fce0e11de9647a6f524e85eac23a0cac8bc2b19b2"
		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 = { e9???????? 8b85f0feffff 8d4c0001 898dd8fcffff }
		$sequence_1 = { 668b84464e720000 6689844a4e720000 0fbf4df0 8b55ec 668b45f4 6689844a4e720000 0fbf4d08 }
		$sequence_2 = { 83c404 33c0 e9???????? 8b85d8fcffff }
		$sequence_3 = { 8b4df0 83e901 894df0 837df000 7e21 8b55f8 83e201 }
		$sequence_4 = { 6a03 68???????? 8b4508 50 ff15???????? 83c40c 85c0 }
		$sequence_5 = { 8b75ec 668b84464e720000 6689844a4e720000 0fbf4df0 8b55ec }
		$sequence_6 = { ff15???????? 8945e4 837de4ff 7511 8b4de8 51 ff15???????? }
		$sequence_7 = { 66898c504a300000 eb1e 0fbf55fc 8b45e8 0fbf8c504c520000 }
		$sequence_8 = { 81c173020000 0fbf55fc 8b45f4 66898c50907e0000 0fbf4dfc 8b55f4 668b45fc }
		$sequence_9 = { 0fbf5508 8b45ec 668b8c501c7c0000 66894d08 0fbf5508 8b45ec 668b8c504e720000 }

	condition:
		7 of them and filesize < 630784
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ e9???????? 8b85f0feffff 8d4c0001 898dd8fcffff }
$sequence_1hex{ 668b84464e720000 6689844a4e720000 0fbf4df0 8b55ec 668b45f4 6689844a4e720000 0fbf4d08 }
$sequence_2hex{ 83c404 33c0 e9???????? 8b85d8fcffff }
$sequence_3hex{ 8b4df0 83e901 894df0 837df000 7e21 8b55f8 83e201 }
$sequence_4hex{ 6a03 68???????? 8b4508 50 ff15???????? 83c40c 85c0 }
$sequence_5hex{ 8b75ec 668b84464e720000 6689844a4e720000 0fbf4df0 8b55ec }
$sequence_6hex{ ff15???????? 8945e4 837de4ff 7511 8b4de8 51 ff15???????? }
$sequence_7hex{ 66898c504a300000 eb1e 0fbf55fc 8b45e8 0fbf8c504c520000 }
$sequence_8hex{ 81c173020000 0fbf55fc 8b45f4 66898c50907e0000 0fbf4dfc 8b55f4 668b45fc }
$sequence_9hex{ 0fbf5508 8b45ec 668b8c501c7c0000 66894d08 0fbf5508 8b45ec 668b8c504e720000 }

Condition

7 of them and filesize < 630784

In plain words (Heuristic)

  • The file must be smaller than 630784 (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: 06ba101e-9797-5160-8466-c700bf70efc4

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