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MALPEDIA_Win_Vx_Rat_Auto

autogenerated rule brought to you by yara-signator

MalwareVx RatMalpedia 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: Vx Rat.

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

Summary generated from the rule's metadata and condition.

Rule source

win-vx-rat-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Vx_Rat_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "941970f3-acd1-5d76-a161-eb83ac443b4a"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.vx_rat"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.vx_rat_auto.yar#L1-L122"
		license_url = "N/A"
		logic_hash = "6e0437926602f26dec13f159f210507f9809f0c1e755d4de82980349c13c6c34"
		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 = { 894de8 33f6 8955ec 6a00 50 }
		$sequence_1 = { ffb574f7ffff ffd6 e9???????? 80f921 7527 a1???????? 85c0 }
		$sequence_2 = { c645fc08 8b9530ffffff c78544ffffff00000000 c78548ffffff07000000 66898534ffffff 83fa08 }
		$sequence_3 = { ff742424 ff15???????? e8???????? 85c0 7509 e8???????? }
		$sequence_4 = { 8b45e4 0f4355d4 03c0 8b4dac }
		$sequence_5 = { b9???????? 8601 6a00 6a00 6a00 56 }
		$sequence_6 = { 8d8518f8ffff 50 e8???????? 83c40c eb1d e8???????? }
		$sequence_7 = { 8b148d10df4300 0355b0 8a0c03 03d3 43 }
		$sequence_8 = { 8d500d a1???????? 8945e8 8bc1 894dec 8955e4 85c9 }
		$sequence_9 = { e8???????? c745fcffffffff e9???????? 83c8ff 8b4df4 64890d00000000 }

	condition:
		7 of them and filesize < 550912
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 894de8 33f6 8955ec 6a00 50 }
$sequence_1hex{ ffb574f7ffff ffd6 e9???????? 80f921 7527 a1???????? 85c0 }
$sequence_2hex{ c645fc08 8b9530ffffff c78544ffffff00000000 c78548ffffff07000000 66898534ffffff 83fa08 }
$sequence_3hex{ ff742424 ff15???????? e8???????? 85c0 7509 e8???????? }
$sequence_4hex{ 8b45e4 0f4355d4 03c0 8b4dac }
$sequence_5hex{ b9???????? 8601 6a00 6a00 6a00 56 }
$sequence_6hex{ 8d8518f8ffff 50 e8???????? 83c40c eb1d e8???????? }
$sequence_7hex{ 8b148d10df4300 0355b0 8a0c03 03d3 43 }
$sequence_8hex{ 8d500d a1???????? 8945e8 8bc1 894dec 8955e4 85c9 }
$sequence_9hex{ e8???????? c745fcffffffff e9???????? 83c8ff 8b4df4 64890d00000000 }

Condition

7 of them and filesize < 550912

In plain words (Heuristic)

  • The file must be smaller than 550912 (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: 941970f3-acd1-5d76-a161-eb83ac443b4a

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