Skip to content

YARA · Malpedia signator rules

MALPEDIA_Win_Webc2_Ausov_Auto

autogenerated rule brought to you by yara-signator

MalwareWebc2 AusovMalpedia 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 Ausov.

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

Summary generated from the rule's metadata and condition.

Rule source

win-webc2-ausov-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Webc2_Ausov_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "9f7dcd3a-83e3-51b1-b972-c6423fd03466"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.webc2_ausov"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.webc2_ausov_auto.yar#L1-L119"
		license_url = "N/A"
		logic_hash = "54e3ad7a65c1020ea5947e1b7fb8d16c99e374f254cf080dd27feb76035c9b99"
		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 = { 83854cfaffff02 80bd46faffff00 75ae c78540faffff00000000 eb0b 1bc0 83d8ff }
		$sequence_1 = { 0f8407000000 0f8501000000 f8 8b550c }
		$sequence_2 = { b941000000 33c0 8dbda9faffff f3ab }
		$sequence_3 = { 7546 80bd47faffff00 7431 8b8548faffff 8a4801 888d46faffff }
		$sequence_4 = { 0355f4 0fbe4201 3345f4 8945fc 0f8407000000 }
		$sequence_5 = { 6a00 8d85a8faffff 50 8d8dbcfcffff }
		$sequence_6 = { 85c9 740d 85c0 7409 5f 5e }
		$sequence_7 = { 6a00 68???????? 8d85f8fbffff 50 e8???????? 83c408 50 }
		$sequence_8 = { 0f8501000000 f8 68???????? 8d8dfcfbffff 51 e8???????? 83c408 }
		$sequence_9 = { ffd3 8bf0 85f6 0f8487000000 8b3d???????? }

	condition:
		7 of them and filesize < 40960
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 83854cfaffff02 80bd46faffff00 75ae c78540faffff00000000 eb0b 1bc0 83d8ff }
$sequence_1hex{ 0f8407000000 0f8501000000 f8 8b550c }
$sequence_2hex{ b941000000 33c0 8dbda9faffff f3ab }
$sequence_3hex{ 7546 80bd47faffff00 7431 8b8548faffff 8a4801 888d46faffff }
$sequence_4hex{ 0355f4 0fbe4201 3345f4 8945fc 0f8407000000 }
$sequence_5hex{ 6a00 8d85a8faffff 50 8d8dbcfcffff }
$sequence_6hex{ 85c9 740d 85c0 7409 5f 5e }
$sequence_7hex{ 6a00 68???????? 8d85f8fbffff 50 e8???????? 83c408 50 }
$sequence_8hex{ 0f8501000000 f8 68???????? 8d8dfcfbffff 51 e8???????? 83c408 }
$sequence_9hex{ ffd3 8bf0 85f6 0f8487000000 8b3d???????? }

Condition

7 of them and filesize < 40960

In plain words (Heuristic)

  • The file must be smaller than 40960 (a cheap guard that skips large files).
  • At least 7 patterns in the rule must match.

Test this rule in your browser

Drop a file to scan it with this rule using YARA-X compiled to WebAssembly. Nothing is uploaded.

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: 9f7dcd3a-83e3-51b1-b972-c6423fd03466

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