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DITEKSHEN_MALWARE_Win_Buterat

Detects ButeRAT

MalwareButeratditekSHen detectionBSD 2-Clause LicenseCompiles with YARA-X
Author
ditekSHen
Date
2020-11-06
Modified
2024-11-01
Score / Quality
75 / 73

What this rule detects

Detects ButeRAT

Associated malware family: Buterat.

Targets: Windows PE.

It defines 10 patterns (9 text, 0 hex, 1 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
malware-win-buterat.yarBSD 2-Clause License
rule DITEKSHEN_MALWARE_Win_Buterat : FILE
{
	meta:
		description = "Detects ButeRAT"
		author = "ditekSHen"
		id = "74f63d61-6589-5fb1-864a-3a02ddd57ebc"
		date = "2020-11-06"
		modified = "2024-11-01"
		reference = "https://github.com/ditekshen/detection"
		source_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/yara/malware.yar#L5822-L5839"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "c3d93e8dc1bde8e77c11586c8d8b67d137ef2c4791e12269f1af310fbe14832b"
		score = 75
		quality = 73
		tags = "FILE"

	strings:
		$x1 = "TVqQAAMAA" ascii
		$s1 = "ipinfo.io/geo" wide
		$s2 = "/index.php" wide
		$s3 = "Copy-Item -Path" wide
		$s4 = ";Start-Process" wide
		$s5 = "Microsoft\\Windows\\Start Menu\\Programs\\Startup" wide
		$s6 = "LOCALAPPDATA" fullword wide
		$s7 = "passwords.json" wide
		$s8 = "Scripting.FileSystemObject" fullword wide
		$z1 = /(edge|chrome|opera|exodus|jaxx|atomic|coinomi)\.zip/ ascii wide nocase

	condition:
		uint16( 0 ) == 0x5a4d and ( ( 1 of ( $x* ) or 1 of ( $z* ) ) and ( 4 of ( $s* ) ) or ( 6 of ( $s* ) ) or ( #z1 > 4 and 2 of them ) )
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$x1text"TVqQAAMAA"ascii
$s1text"ipinfo.io/geo"wide
$s2text"/index.php"wide
$s3text"Copy-Item -Path"wide
$s4text";Start-Process"wide
$s5text"Microsoft\\Windows\\Start Menu\\Programs\\Startup"wide
$s6text"LOCALAPPDATA"fullword wide
$s7text"passwords.json"wide
$s8text"Scripting.FileSystemObject"fullword wide
$z1regex/(edge|chrome|opera|exodus|jaxx|atomic|coinomi)\.zip/ascii wide nocase

Condition

uint16( 0 ) == 0x5a4d and ( ( 1 of ( $x* ) or 1 of ( $z* ) ) and ( 4 of ( $s* ) ) or ( 6 of ( $s* ) ) or ( #z1 > 4 and 2 of them ) )

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • At least 1 patterns in ( $x* ) must match.
  • At least 1 patterns in ( $z* ) must match.
  • At least 4 patterns in ( $s* ) must match.
  • At least 6 patterns in ( $s* ) must match.
  • At least 2 patterns in the rule must match.
  • Pattern $z1 must occur > 4 times.

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References

Licence & attribution

Author: ditekSHen

Source repository: ditekSHen detection @ e76c93dcde

Licence: BSD 2-Clause License (repository licence)

Copyright notice: Copyright 2021 by ditekSHen (https://github.com/ditekshen/detection).

Original rule

Mirrored via YARA Forge 20260927, which prefixes rule names with the source and adds normalised meta fields.

Rule id: 74f63d61-6589-5fb1-864a-3a02ddd57ebc

Tags:FILE

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