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SEKOIA_Downloader_Mac_Smooth_Operator

Detect the Smooth_Operator malware

MalwareSEKOIA.IO CommunityDetection Rule License 1.1Compiles with YARA-X
Author
Sekoia.io
Date
2023-07-04
Modified
2024-12-19
Score / Quality
75 / 80

What this rule detects

Detect the Smooth_Operator malware

Targets: macOS Mach-O.

It defines 2 patterns (2 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

downloader-mac-smooth-operator.yarDetection Rule License 1.1
rule SEKOIA_Downloader_Mac_Smooth_Operator : FILE
{
	meta:
		description = "Detect the Smooth_Operator malware"
		author = "Sekoia.io"
		id = "c132b3f0-f536-4a66-bcf8-2a95c258c414"
		date = "2023-07-04"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/downloader_mac_smooth_operator.yar#L1-L16"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "031f766d6ab7d94ed7ba4324d4bdfa3fbc11986fba35487a88a1ee3aba090c82"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "%s/.main_storage"
		$ = "%s/UpdateAgent"

	condition:
		uint32be( 0 ) == 0xcafebabe and all of them
}

Strings (2 patterns)

IdentifierTypeValueModifiers
$text"%s/.main_storage"
$text"%s/UpdateAgent"

Condition

uint32be( 0 ) == 0xcafebabe and all of them

In plain words (Heuristic)

  • The file must start with a Mach-O / fat binary magic — a macOS executable.
  • All 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: c132b3f0-f536-4a66-bcf8-2a95c258c414

Metadata

version1.0
classificationTLP:CLEAR

Tags:FILE