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MALPEDIA_Win_Aytoke_Auto

autogenerated rule brought to you by yara-signator

MalwareAytokeMalpedia 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: Aytoke.

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

Summary generated from the rule's metadata and condition.

Rule source

win-aytoke-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Aytoke_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "39bf8de3-7737-55a3-9f66-3004c8cf8c87"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.aytoke"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.aytoke_auto.yar#L1-L121"
		license_url = "N/A"
		logic_hash = "46f5b2cb8de02b95d7e25f12ff635b05a8410abd31c30d35c4b45772db77405e"
		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 = { 8d95f4f7ffff 56 52 e8???????? 83c404 50 e8???????? }
		$sequence_1 = { 56 57 33ff ffb770874100 ff15???????? 898770874100 83c704 }
		$sequence_2 = { 75f8 8b0d???????? 8a15???????? 8908 885004 8bc7 }
		$sequence_3 = { e8???????? e8???????? b8???????? 8d5001 8d4900 8a08 }
		$sequence_4 = { e8???????? 83c404 be4f000000 8d9b00000000 }
		$sequence_5 = { 50 e8???????? 83c404 b001 8b4dfc 33cd e8???????? }
		$sequence_6 = { 52 e8???????? b8???????? 83c404 2d???????? bb01000000 8945f4 }
		$sequence_7 = { 8bc8 c1f905 8b0c8d00c44100 83e01f }
		$sequence_8 = { 83e01f c1f905 8b0c8d00c44100 c1e006 8d440104 }
		$sequence_9 = { c1fe05 c1e106 030cb500c44100 eb02 }

	condition:
		7 of them and filesize < 425984
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 8d95f4f7ffff 56 52 e8???????? 83c404 50 e8???????? }
$sequence_1hex{ 56 57 33ff ffb770874100 ff15???????? 898770874100 83c704 }
$sequence_2hex{ 75f8 8b0d???????? 8a15???????? 8908 885004 8bc7 }
$sequence_3hex{ e8???????? e8???????? b8???????? 8d5001 8d4900 8a08 }
$sequence_4hex{ e8???????? 83c404 be4f000000 8d9b00000000 }
$sequence_5hex{ 50 e8???????? 83c404 b001 8b4dfc 33cd e8???????? }
$sequence_6hex{ 52 e8???????? b8???????? 83c404 2d???????? bb01000000 8945f4 }
$sequence_7hex{ 8bc8 c1f905 8b0c8d00c44100 83e01f }
$sequence_8hex{ 83e01f c1f905 8b0c8d00c44100 c1e006 8d440104 }
$sequence_9hex{ c1fe05 c1e106 030cb500c44100 eb02 }

Condition

7 of them and filesize < 425984

In plain words (Heuristic)

  • The file must be smaller than 425984 (a cheap guard that skips large files).
  • At least 7 patterns in the rule must match.

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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: 39bf8de3-7737-55a3-9f66-3004c8cf8c87

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