SEKOIA_Plugx_Final_Payload

import "pe"

rule SEKOIA_Plugx_Final_Payload : FILE
{
	meta:
		description = "Detects encrypted plugx config with a specific size"
		author = "Sekoia.io"
		id = "a4047324-81a7-4c17-be84-c0fa479d2f89"
		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/plugx_final_payload.yar#L3-L23"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "bf5035eb7ed620edcf7a0e8e8be220451ce268fc49310f28059b60576d8c5182"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$s1 = {30 31 32 33 34 35 36 37 38 39 41 42 43 44 45 46 88 13 00 00 60 ea 00 00 ?? ?? ?? ?? 00 00 00 00}

	condition:
		( uint32be( 0 ) == 0x7f454c46 or uint16be( 0 ) == 0x4d5a ) and filesize < 8MB and for any i in ( 0 .. pe.number_of_sections -1 ) : ( pe.sections [ i ] . name == ".data" and $s1 in ( pe.sections [ i ] . raw_data_offset..pe.sections [ i ] . raw_data_offset + pe.sections [ i ] . raw_data_size ) )
}