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DITEKSHEN_MALWARE_Win_Tofsee

Detects Tofsee

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

What this rule detects

Detects Tofsee

Associated malware family: Tofsee.

Targets: Windows PE.

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

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
malware-win-tofsee.yarBSD 2-Clause License
rule DITEKSHEN_MALWARE_Win_Tofsee : FILE
{
	meta:
		description = "Detects Tofsee"
		author = "ditekSHen"
		id = "86371c0b-72f9-56c0-9f34-f14d2a069c91"
		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#L8933-L8949"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "9ef06643173c70c5b06b19200cb5b5efa7db7eb3516b67621f0b1975f1c80781"
		score = 75
		quality = 75
		tags = "FILE"

	strings:
		$s1 = "n%systemroot%\\system32\\cmd.exe" fullword wide
		$s2 = "loader_id" fullword ascii
		$s3 = "start_srv" fullword ascii
		$s4 = "lid_file_upd" fullword ascii
		$s5 = "localcfg" fullword ascii
		$s6 = "Incorrect respons" fullword ascii
		$s7 = "mx connect error" fullword ascii
		$s8 = "Error sending command (sent = %d/%d)" fullword ascii
		$s9 = "%s, %u %s %u %.2u:%.2u:%.2u %s%.2u%.2u" fullword ascii

	condition:
		uint16( 0 ) == 0x5a4d and 5 of them
}

Strings (9 patterns)

IdentifierTypeValueModifiers
$s1text"n%systemroot%\\system32\\cmd.exe"fullword wide
$s2text"loader_id"fullword ascii
$s3text"start_srv"fullword ascii
$s4text"lid_file_upd"fullword ascii
$s5text"localcfg"fullword ascii
$s6text"Incorrect respons"fullword ascii
$s7text"mx connect error"fullword ascii
$s8text"Error sending command (sent = %d/%d)"fullword ascii
$s9text"%s, %u %s %u %.2u:%.2u:%.2u %s%.2u%.2u"fullword ascii

Condition

uint16( 0 ) == 0x5a4d and 5 of them

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • At least 5 patterns in the rule must match.

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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: 86371c0b-72f9-56c0-9f34-f14d2a069c91

Tags:FILE

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