Skip to content

YARA · Malpedia signator rules

MALPEDIA_Win_Atmitch_Auto

autogenerated rule brought to you by yara-signator

MalwareAtmitchMalpedia 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: Atmitch.

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

Summary generated from the rule's metadata and condition.

Rule source

win-atmitch-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Atmitch_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "d46e4955-9c99-5429-9db9-d72f11678fb3"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.atmitch"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.atmitch_auto.yar#L1-L127"
		license_url = "N/A"
		logic_hash = "47e8cf221fe7216b11c686530de58bb5caeb8ac20fac4ae14e17077791312d91"
		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 = { 7407 8b542418 895004 837c242400 740c 8b442420 50 }
		$sequence_1 = { 8b4204 50 51 8bcc 8964241c 68???????? ff15???????? }
		$sequence_2 = { ff15???????? c744242000000000 833d????????02 7f05 e8???????? a1???????? }
		$sequence_3 = { 8b4818 83c408 51 51 8bcc 8964241c }
		$sequence_4 = { eb1b 50 51 8bcc 8964241c 68???????? ff15???????? }
		$sequence_5 = { ff15???????? 50 ff15???????? 6aff b9???????? 8bf0 ff15???????? }
		$sequence_6 = { ff15???????? 8d4c2420 c644244803 ff15???????? }
		$sequence_7 = { 8bf8 83c404 33c9 33d2 33c0 6a11 }
		$sequence_8 = { 83ec2c a1???????? 33c4 89442428 0fb705???????? 53 }
		$sequence_9 = { 8b0e 0fb7412c 83c408 83f809 774d ff2485f4200010 b8???????? }

	condition:
		7 of them and filesize < 73728
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 7407 8b542418 895004 837c242400 740c 8b442420 50 }
$sequence_1hex{ 8b4204 50 51 8bcc 8964241c 68???????? ff15???????? }
$sequence_2hex{ ff15???????? c744242000000000 833d????????02 7f05 e8???????? a1???????? }
$sequence_3hex{ 8b4818 83c408 51 51 8bcc 8964241c }
$sequence_4hex{ eb1b 50 51 8bcc 8964241c 68???????? ff15???????? }
$sequence_5hex{ ff15???????? 50 ff15???????? 6aff b9???????? 8bf0 ff15???????? }
$sequence_6hex{ ff15???????? 8d4c2420 c644244803 ff15???????? }
$sequence_7hex{ 8bf8 83c404 33c9 33d2 33c0 6a11 }
$sequence_8hex{ 83ec2c a1???????? 33c4 89442428 0fb705???????? 53 }
$sequence_9hex{ 8b0e 0fb7412c 83c408 83f809 774d ff2485f4200010 b8???????? }

Condition

7 of them and filesize < 73728

In plain words (Heuristic)

  • The file must be smaller than 73728 (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: d46e4955-9c99-5429-9db9-d72f11678fb3

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