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YARA · ditekSHen detection

DITEKSHEN_MALWARE_Win_Owowa

Detects Owowa

MalwareOwowaditekSHen 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 Owowa

Associated malware family: Owowa.

Targets: Windows PE.

It defines 11 patterns (11 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
malware-win-owowa.yarBSD 2-Clause License
rule DITEKSHEN_MALWARE_Win_Owowa : FILE
{
	meta:
		description = "Detects Owowa"
		author = "ditekSHen"
		id = "c0a61601-e810-5acc-91a3-fa70db6d94da"
		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#L8989-L9007"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "afdeb30845ed4ef7b79e733e05d3e1ee53a8c441db74519577893d75c1249a41"
		score = 75
		quality = 75
		tags = "FILE"

	strings:
		$u1 = "jFuLIXpzRdateYHoVwMlfc" fullword ascii wide
		$u2 = "Fb8v91c6tHiKsWzrulCeqO" fullword ascii wide
		$u3 = "dEUM3jZXaDiob8BrqSy2PQO1" fullword ascii wide
		$s1 = "powershell.exe" fullword wide
		$s2 = "<RSAKeyValue><Modulus>" wide
		$s3 = "HealthMailbox" fullword wide
		$s4 = "6801b573-4cdb-4307-8d4a-3d1e2842f09f" ascii
		$s5 = "<PreSend_RequestContent>b__" ascii
		$s6 = "ClearHeaders" fullword ascii
		$s7 = "get_UserHostAddress" fullword ascii
		$s8 = "ExtenderControlDesigner" fullword ascii

	condition:
		uint16( 0 ) == 0x5a4d and ( all of ( $u* ) or ( 2 of ( $u* ) and 3 of ( $s* ) ) or 6 of ( $s* ) )
}

Strings (11 patterns)

IdentifierTypeValueModifiers
$u1text"jFuLIXpzRdateYHoVwMlfc"fullword ascii wide
$u2text"Fb8v91c6tHiKsWzrulCeqO"fullword ascii wide
$u3text"dEUM3jZXaDiob8BrqSy2PQO1"fullword ascii wide
$s1text"powershell.exe"fullword wide
$s2text"<RSAKeyValue><Modulus>"wide
$s3text"HealthMailbox"fullword wide
$s4text"6801b573-4cdb-4307-8d4a-3d1e2842f09f"ascii
$s5text"<PreSend_RequestContent>b__"ascii
$s6text"ClearHeaders"fullword ascii
$s7text"get_UserHostAddress"fullword ascii
$s8text"ExtenderControlDesigner"fullword ascii

Condition

uint16( 0 ) == 0x5a4d and ( all of ( $u* ) or ( 2 of ( $u* ) and 3 of ( $s* ) ) or 6 of ( $s* ) )

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • All patterns in ( $u* ) must match.
  • At least 2 patterns in ( $u* ) must match.
  • At least 3 patterns in ( $s* ) must match.
  • At least 6 patterns in ( $s* ) 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: c0a61601-e810-5acc-91a3-fa70db6d94da

Tags:FILE

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