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MALPEDIA_Win_Ransomexx_Auto

autogenerated rule brought to you by yara-signator

MalwareRansomexxMalpedia 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: Ransomexx.

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

Summary generated from the rule's metadata and condition.

Rule source

win-ransomexx-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Ransomexx_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "6ea86412-775d-5ea3-9fa6-8c1e24027d09"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.ransomexx"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.ransomexx_auto.yar#L1-L132"
		license_url = "N/A"
		logic_hash = "6d160f4a9e1a1a6b6eaef39eeef60476059a4b709022cd6ad7b0f96462908057"
		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 = { c3 3bc8 735c 6a04 50 ff15???????? 8bd8 }
		$sequence_1 = { 897df8 3bf9 0f849d010000 eb03 8b7df8 8b5728 0fb77724 }
		$sequence_2 = { 50 8d4df4 51 6a04 52 ffd6 }
		$sequence_3 = { 8d8424b8010000 e8???????? 83c007 c1e803 898424b4010000 8b842454020000 2bc6 }
		$sequence_4 = { 83c40c 51 ff15???????? 83c404 8b4dd8 85c9 7425 }
		$sequence_5 = { 750e 8b7d10 8d742410 e8???????? 8bf0 8b0d???????? 68d8000000 }
		$sequence_6 = { 7507 c7431001000000 a1???????? 6880010000 8d957cfeffff 6a00 52 }
		$sequence_7 = { 33f6 3935???????? 750f e8???????? c705????????01000000 0f31 a3???????? }
		$sequence_8 = { e8???????? 8bf0 83c404 85f6 0f8582030000 8b4514 85c0 }
		$sequence_9 = { 3dea000000 74b7 8b4618 03c6 7454 8b4808 }

	condition:
		7 of them and filesize < 372736
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ c3 3bc8 735c 6a04 50 ff15???????? 8bd8 }
$sequence_1hex{ 897df8 3bf9 0f849d010000 eb03 8b7df8 8b5728 0fb77724 }
$sequence_2hex{ 50 8d4df4 51 6a04 52 ffd6 }
$sequence_3hex{ 8d8424b8010000 e8???????? 83c007 c1e803 898424b4010000 8b842454020000 2bc6 }
$sequence_4hex{ 83c40c 51 ff15???????? 83c404 8b4dd8 85c9 7425 }
$sequence_5hex{ 750e 8b7d10 8d742410 e8???????? 8bf0 8b0d???????? 68d8000000 }
$sequence_6hex{ 7507 c7431001000000 a1???????? 6880010000 8d957cfeffff 6a00 52 }
$sequence_7hex{ 33f6 3935???????? 750f e8???????? c705????????01000000 0f31 a3???????? }
$sequence_8hex{ e8???????? 8bf0 83c404 85f6 0f8582030000 8b4514 85c0 }
$sequence_9hex{ 3dea000000 74b7 8b4618 03c6 7454 8b4808 }

Condition

7 of them and filesize < 372736

In plain words (Heuristic)

  • The file must be smaller than 372736 (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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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: 6ea86412-775d-5ea3-9fa6-8c1e24027d09

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

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