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SEKOIA_Hacktool_Rubeus_Strings

Detects Rubeus based on strings

Hack toolSEKOIA.IO CommunityDetection Rule License 1.1Compiles with YARA-X
Author
Sekoia.io
Date
2022-02-15
Modified
2024-12-19
Score / Quality
75 / 80

What this rule detects

Detects Rubeus based on strings

Targets: Windows PE.

It defines 5 patterns (5 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
hacktool-rubeus-strings.yarDetection Rule License 1.1
rule SEKOIA_Hacktool_Rubeus_Strings : FILE
{
	meta:
		description = "Detects Rubeus based on strings"
		author = "Sekoia.io"
		id = "048cab99-c288-44c2-9dc6-74eed02ef8f5"
		date = "2022-02-15"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/hacktool_rubeus_strings.yar#L1-L21"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "606c1b3c29dd4b609eba64bc5d02a81859bb574ee10bce8b0f355ac01d99689f"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "includeComputerAccounts" ascii
		$ = "passwordsOutfile" ascii
		$ = "monitorIntervalSeconds" ascii
		$ = "displayNewTickets" ascii
		$ = "658c8b7f-3664-4a95-9572-a3e5871dfc06" ascii

	condition:
		uint16be( 0 ) == 0x4d5a and filesize < 1MB and 4 of them
}

Strings (5 patterns)

IdentifierTypeValueModifiers
$text"includeComputerAccounts"ascii
$text"passwordsOutfile"ascii
$text"monitorIntervalSeconds"ascii
$text"displayNewTickets"ascii
$text"658c8b7f-3664-4a95-9572-a3e5871dfc06"ascii

Condition

uint16be( 0 ) == 0x4d5a and filesize < 1MB and 4 of them

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • The file must be smaller than 1MB (a cheap guard that skips large files).
  • At least 4 patterns in the rule must match.

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References

Licence & attribution

Author: Sekoia.io

Source repository: SEKOIA.IO Community @ a438a5901a

Licence: Detection Rule License 1.1 (repository licence)

Original rule

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

Rule id: 048cab99-c288-44c2-9dc6-74eed02ef8f5

Metadata

version1.0
classificationTLP:CLEAR

Tags:FILE

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