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MALPEDIA_Win_Zebrocy_Auto

autogenerated rule brought to you by yara-signator

MalwareZebrocyMalpedia 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: Zebrocy.

It defines 16 patterns (0 text, 16 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

win-zebrocy-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Zebrocy_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "0c26eaee-ceca-571b-b5d3-25fb9badb48b"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.zebrocy"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.zebrocy_auto.yar#L1-L167"
		license_url = "N/A"
		logic_hash = "89617f1d3dcb35789544bd09fa73885d6783a0c2248e99f8d5ce1abc3cd36b06"
		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 = { 8bf3 e8???????? c645fc00 837dd410 720c 8b4dc0 51 }
		$sequence_1 = { 56 53 83ec0c 837d0800 7e3a }
		$sequence_2 = { 55 ba???????? b9???????? 89e5 83ec08 e8???????? }
		$sequence_3 = { 8bf3 c745fc01000000 e8???????? 837db010 0f8291020000 8b459c }
		$sequence_4 = { 66891478 8bc6 5f c3 8bff }
		$sequence_5 = { c705????????50c34100 c705????????43f74000 c705????????02000000 c605????????02 }
		$sequence_6 = { 8b55ec 33ff 897c1820 897c1824 }
		$sequence_7 = { 884dc8 8a4c3b0a 83c703 8975b4 c1ee02 884db8 }
		$sequence_8 = { 897e10 897e14 837dd410 720c }
		$sequence_9 = { 8b4a04 8b55ec 03cb 85d2 7420 8b410c }
		$sequence_10 = { c705????????04000000 c605????????16 c705????????a4c34100 c605????????02 c705????????01000000 }
		$sequence_11 = { 83e13f 8a89e8f64000 884c100b 8b4de0 394ddc 7e08 }
		$sequence_12 = { 7409 c745e400000000 eb53 31d2 }
		$sequence_13 = { 8d8508f7ffff 8a1c38 8db598f6ffff e8???????? }
		$sequence_14 = { 83e71f c1e706 8b0485c0a84200 8d44380c 50 ff15???????? 8b45e4 }
		$sequence_15 = { 31db 84d2 742f 39c3 0f9ec2 7f21 }

	condition:
		7 of them and filesize < 393216
}

Strings (16 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 8bf3 e8???????? c645fc00 837dd410 720c 8b4dc0 51 }
$sequence_1hex{ 56 53 83ec0c 837d0800 7e3a }
$sequence_2hex{ 55 ba???????? b9???????? 89e5 83ec08 e8???????? }
$sequence_3hex{ 8bf3 c745fc01000000 e8???????? 837db010 0f8291020000 8b459c }
$sequence_4hex{ 66891478 8bc6 5f c3 8bff }
$sequence_5hex{ c705????????50c34100 c705????????43f74000 c705????????02000000 c605????????02 }
$sequence_6hex{ 8b55ec 33ff 897c1820 897c1824 }
$sequence_7hex{ 884dc8 8a4c3b0a 83c703 8975b4 c1ee02 884db8 }
$sequence_8hex{ 897e10 897e14 837dd410 720c }
$sequence_9hex{ 8b4a04 8b55ec 03cb 85d2 7420 8b410c }
$sequence_10hex{ c705????????04000000 c605????????16 c705????????a4c34100 c605????????02 c705????????01000000 }
$sequence_11hex{ 83e13f 8a89e8f64000 884c100b 8b4de0 394ddc 7e08 }
$sequence_12hex{ 7409 c745e400000000 eb53 31d2 }
$sequence_13hex{ 8d8508f7ffff 8a1c38 8db598f6ffff e8???????? }
$sequence_14hex{ 83e71f c1e706 8b0485c0a84200 8d44380c 50 ff15???????? 8b45e4 }
$sequence_15hex{ 31db 84d2 742f 39c3 0f9ec2 7f21 }

Condition

7 of them and filesize < 393216

In plain words (Heuristic)

  • The file must be smaller than 393216 (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: 0c26eaee-ceca-571b-b5d3-25fb9badb48b

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