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MALPEDIA_Win_Fog_Auto

autogenerated rule brought to you by yara-signator

MalwareFogMalpedia 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: Fog.

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

Summary generated from the rule's metadata and condition.

Rule source

win-fog-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Fog_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "27093879-8447-569c-ae55-3e1d5a8c1427"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.fog"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.fog_auto.yar#L1-L125"
		license_url = "N/A"
		logic_hash = "b2379271b457633feb71d63c90b505115c440680fbd3f3ea65f8eff573cb5e89"
		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 = { ffd6 8d87e0140000 50 ff35???????? }
		$sequence_1 = { 33c9 0f1f4000 660fbed3 6689944d50fbffff }
		$sequence_2 = { ffd6 8b7df0 83c704 83eb01 897df0 895dec 0f85b4fdffff }
		$sequence_3 = { 0f44f0 8b87500e0000 8975e8 c7400801000000 8a02 84c0 7432 }
		$sequence_4 = { 5d c3 55 8bec 81ecf0000000 56 68???????? }
		$sequence_5 = { 8b4d0c 85f6 75ba 5f 5b 33c0 5e }
		$sequence_6 = { e8???????? 8b5d08 0bf0 8b45ec 0bfa 8b55f4 }
		$sequence_7 = { 8bca 898300200000 8bc2 c1e918 c1e810 }
		$sequence_8 = { 038c8300180000 c1ea08 0fb6c2 038c8300140000 0fb68338200000 038c8300100000 8b45fc }
		$sequence_9 = { 85ff 7e37 8b550c 53 8b5d08 2bda 837d1400 }

	condition:
		7 of them and filesize < 244736
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ ffd6 8d87e0140000 50 ff35???????? }
$sequence_1hex{ 33c9 0f1f4000 660fbed3 6689944d50fbffff }
$sequence_2hex{ ffd6 8b7df0 83c704 83eb01 897df0 895dec 0f85b4fdffff }
$sequence_3hex{ 0f44f0 8b87500e0000 8975e8 c7400801000000 8a02 84c0 7432 }
$sequence_4hex{ 5d c3 55 8bec 81ecf0000000 56 68???????? }
$sequence_5hex{ 8b4d0c 85f6 75ba 5f 5b 33c0 5e }
$sequence_6hex{ e8???????? 8b5d08 0bf0 8b45ec 0bfa 8b55f4 }
$sequence_7hex{ 8bca 898300200000 8bc2 c1e918 c1e810 }
$sequence_8hex{ 038c8300180000 c1ea08 0fb6c2 038c8300140000 0fb68338200000 038c8300100000 8b45fc }
$sequence_9hex{ 85ff 7e37 8b550c 53 8b5d08 2bda 837d1400 }

Condition

7 of them and filesize < 244736

In plain words (Heuristic)

  • The file must be smaller than 244736 (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: 27093879-8447-569c-ae55-3e1d5a8c1427

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