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DITEKSHEN_INDICATOR_RTF_Malver_Objects

Detects RTF documents with non-standard version and embeding one of the object mostly observed in exploit documents.

Suspicious / huntingditekSHen detectionBSD 2-Clause LicenseCompiles with YARA-X
Author
ditekSHen
Date
2020-11-06
Modified
2024-09-06
Score / Quality
75 / 75

What this rule detects

Detects RTF documents with non-standard version and embeding one of the object mostly observed in exploit documents.

It defines 6 patterns (6 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
indicator-rtf-malver-objects.yarBSD 2-Clause License
rule DITEKSHEN_INDICATOR_RTF_Malver_Objects : FILE
{
	meta:
		description = "Detects RTF documents with non-standard version and embeding one of the object mostly observed in exploit documents."
		author = "ditekSHen"
		id = "2d9d80e0-473e-5aac-a576-8f0002e120e2"
		date = "2020-11-06"
		modified = "2024-09-06"
		reference = "https://github.com/ditekshen/detection"
		source_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/yara/indicator_office.yar#L704-L718"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "69136fb8ba180f6f86e569471bcefe8f55c61af73c66ebd6062ba7369aee9a72"
		score = 75
		quality = 75
		tags = "FILE"

	strings:
		$obj1 = "\\objhtml" ascii
		$obj2 = "\\objdata" ascii
		$obj3 = "\\objupdate" ascii
		$obj4 = "\\objemb" ascii
		$obj5 = "\\objautlink" ascii
		$obj6 = "\\objlink" ascii

	condition:
		uint32( 0 ) == 0x74725c7b and ( ( not uint8( 4 ) == 0x66 or not uint8( 5 ) == 0x31 or not uint8( 6 ) == 0x5c ) and 1 of ( $obj* ) )
}

Strings (6 patterns)

IdentifierTypeValueModifiers
$obj1text"\\objhtml"ascii
$obj2text"\\objdata"ascii
$obj3text"\\objupdate"ascii
$obj4text"\\objemb"ascii
$obj5text"\\objautlink"ascii
$obj6text"\\objlink"ascii

Condition

uint32( 0 ) == 0x74725c7b and ( ( not uint8( 4 ) == 0x66 or not uint8( 5 ) == 0x31 or not uint8( 6 ) == 0x5c ) and 1 of ( $obj* ) )

In plain words (Heuristic)

  • The file must start with “{\rt” — an RTF document.
  • At least 1 patterns in ( $obj* ) 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: 2d9d80e0-473e-5aac-a576-8f0002e120e2

Tags:FILE

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