SEKOIA_Apt_Aptk47_Asyncshell

rule SEKOIA_Apt_Aptk47_Asyncshell : FILE
{
	meta:
		description = "Detects APT-K-47's Asyncshell"
		author = "Sekoia.io"
		id = "2d009cf4-e30e-406d-8860-03b37a396ffa"
		date = "2024-11-22"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/apt_aptk47_asyncshell.yar#L1-L24"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		hash = "ce6a589d5e3604112e5595a1f8d53e1e"
		hash = "751f427da8e11d8ab394574260735220"
		logic_hash = "ac202f7dc317d17118badf71c32776c5666eea4a47e1b439a287b6b8766e9da6"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "Error executing command:" wide
		$ = "Error occurred:" wide
		$ = "Attempting to reconnect in {0} seconds..." wide
		$ = "Exiting the application." wide
		$ = "Server disconnected." wide
		$ = "_CorExeMain"

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