SEKOIA_Apt_Kimsuky_Malicious_Vba

rule SEKOIA_Apt_Kimsuky_Malicious_Vba : FILE
{
	meta:
		description = "Detects malicious VBA used by Kimsuky"
		author = "Sekoia.io"
		id = "2dbe2431-3592-4395-8164-49abae4a5a3d"
		date = "2022-08-30"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/apt_kimsuky_malicious_vba.yar#L1-L18"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "68d7b757f660907fcea3ea03c4027b429f8acdef6569d63cdb744e9d77637080"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "Certutil -decode %TMP%"
		$ = "%LOCALAPPDATA%\\Microsoft\\Office"

	condition:
		uint32be( 0 ) == 0xD0CF11E0 and filesize < 1MB and all of them
}