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MALPEDIA_Win_Zeroaccess_Auto

autogenerated rule brought to you by yara-signator

MalwareZeroaccessMalpedia 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: Zeroaccess.

It defines 14 patterns (0 text, 14 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

win-zeroaccess-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Zeroaccess_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "d6895c5d-03b4-5482-a225-c716497077e5"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.zeroaccess"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.zeroaccess_auto.yar#L1-L144"
		license_url = "N/A"
		logic_hash = "e144ce8260c81dad853ba3565e71a072be1e883cbcc3648a4cb072052ebb1362"
		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 = { 85c0 7408 ff15???????? eb02 }
		$sequence_1 = { 56 68???????? 50 8d460c 50 }
		$sequence_2 = { 6a01 8d45f4 50 ff7308 ff15???????? 85c0 7408 }
		$sequence_3 = { 33c0 48 83c9ff c744242804000000 48 }
		$sequence_4 = { 56 6a10 8945e8 8d45e4 50 }
		$sequence_5 = { 68???????? 68060000c8 ff7708 ff15???????? 85c0 }
		$sequence_6 = { 50 68???????? 6889001200 8d45fc }
		$sequence_7 = { 68???????? 68060000c8 ff7308 ff15???????? }
		$sequence_8 = { 740c bf03000040 eb05 bf010000c0 85ff }
		$sequence_9 = { 3bc1 7604 83c8ff c3 }
		$sequence_10 = { ff15???????? 85c0 7407 b8e3030000 }
		$sequence_11 = { 7e29 41 8d5001 41 8bc0 }
		$sequence_12 = { 85c0 753d 8175bb01010101 48 8d4de7 }
		$sequence_13 = { fec1 45 0fb6c1 47 021418 43 }

	condition:
		7 of them and filesize < 464896
}

Strings (14 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 85c0 7408 ff15???????? eb02 }
$sequence_1hex{ 56 68???????? 50 8d460c 50 }
$sequence_2hex{ 6a01 8d45f4 50 ff7308 ff15???????? 85c0 7408 }
$sequence_3hex{ 33c0 48 83c9ff c744242804000000 48 }
$sequence_4hex{ 56 6a10 8945e8 8d45e4 50 }
$sequence_5hex{ 68???????? 68060000c8 ff7708 ff15???????? 85c0 }
$sequence_6hex{ 50 68???????? 6889001200 8d45fc }
$sequence_7hex{ 68???????? 68060000c8 ff7308 ff15???????? }
$sequence_8hex{ 740c bf03000040 eb05 bf010000c0 85ff }
$sequence_9hex{ 3bc1 7604 83c8ff c3 }
$sequence_10hex{ ff15???????? 85c0 7407 b8e3030000 }
$sequence_11hex{ 7e29 41 8d5001 41 8bc0 }
$sequence_12hex{ 85c0 753d 8175bb01010101 48 8d4de7 }
$sequence_13hex{ fec1 45 0fb6c1 47 021418 43 }

Condition

7 of them and filesize < 464896

In plain words (Heuristic)

  • The file must be smaller than 464896 (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.

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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: d6895c5d-03b4-5482-a225-c716497077e5

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