SEKOIA_Crimeware_Njrat_Strings

rule SEKOIA_Crimeware_Njrat_Strings : FILE
{
	meta:
		description = "Detects njRAT based on some strings"
		author = "Sekoia.io"
		id = "215807ae-fbcb-478d-8941-e0787b883669"
		date = "2022-08-22"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/crimeware_njrat_strings.yar#L1-L24"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "47102adde81682c3c1c856c3495c6f98a9e39aa052eac2ab0a803dab44d19c26"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "set cdaudio door closed" wide
		$ = "set cdaudio door open" wide
		$ = "ping 0" wide
		$ = "[endof]" wide
		$ = "TiGeR-Firewall" wide
		$ = "NetSnifferCs" wide
		$ = "IPBlocker" wide
		$ = "Sandboxie Control" wide

	condition:
		uint16be( 0 ) == 0x4d5a and filesize < 1MB and 5 of them
}