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MALPEDIA_Win_Crypto_Fortress_Auto

autogenerated rule brought to you by yara-signator

MalwareCrypto FortressMalpedia 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: Crypto Fortress.

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

Summary generated from the rule's metadata and condition.

Rule source

win-crypto-fortress-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Crypto_Fortress_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "0bf71c54-09bb-59cb-b039-4d083a85e348"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.crypto_fortress"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.crypto_fortress_auto.yar#L1-L123"
		license_url = "N/A"
		logic_hash = "934226d21b9dd2b35a75e329b03dc3c961c618ff4cd147cc2b841d3179b65de1"
		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 = { eb04 03f1 8bff 83c601 }
		$sequence_1 = { 3400 aa 3412 aa }
		$sequence_2 = { 75a9 a1???????? a3???????? a1???????? a3???????? 68???????? }
		$sequence_3 = { 0bc0 7402 eb39 6a00 8d45ac 50 }
		$sequence_4 = { 8bec 81c4a4feffff ff35???????? e8???????? 8985b4feffff ff35???????? e8???????? }
		$sequence_5 = { 33c0 0442 aa 2ce1 aa 2ce7 aa }
		$sequence_6 = { aa 3418 aa 3404 aa 2c53 aa }
		$sequence_7 = { 2cf1 aa 04f9 aa 3447 aa }
		$sequence_8 = { aa 3417 aa 3422 aa }
		$sequence_9 = { b832000000 8bc8 6a00 8d45f8 50 51 68???????? }

	condition:
		7 of them and filesize < 188416
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ eb04 03f1 8bff 83c601 }
$sequence_1hex{ 3400 aa 3412 aa }
$sequence_2hex{ 75a9 a1???????? a3???????? a1???????? a3???????? 68???????? }
$sequence_3hex{ 0bc0 7402 eb39 6a00 8d45ac 50 }
$sequence_4hex{ 8bec 81c4a4feffff ff35???????? e8???????? 8985b4feffff ff35???????? e8???????? }
$sequence_5hex{ 33c0 0442 aa 2ce1 aa 2ce7 aa }
$sequence_6hex{ aa 3418 aa 3404 aa 2c53 aa }
$sequence_7hex{ 2cf1 aa 04f9 aa 3447 aa }
$sequence_8hex{ aa 3417 aa 3422 aa }
$sequence_9hex{ b832000000 8bc8 6a00 8d45f8 50 51 68???????? }

Condition

7 of them and filesize < 188416

In plain words (Heuristic)

  • The file must be smaller than 188416 (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: 0bf71c54-09bb-59cb-b039-4d083a85e348

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