SEKOIA_Apt_Gelsemium_Firewood_Backdoor

rule SEKOIA_Apt_Gelsemium_Firewood_Backdoor : FILE
{
	meta:
		description = "Detects Gelsemium's FireWood backdoor"
		author = "Sekoia.io"
		id = "93670c07-9edd-4ea2-b8ed-6fee625491f4"
		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_gelsemium_firewood_backdoor.yar#L1-L21"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		hash = "2251bc7910fe46fd0baf8bc05599bdcf"
		logic_hash = "dea8c7cfb35b3cc026a0df844e118b495e3ad0a85f55e2fd3b63a41dde2ea944"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "root dir:%s"
		$ = "df -h|grep 'dev' |grep -v none|awk '/dev/{print $6}'"
		$ = "rm -rf ../lib/%s"
		$ = "Total Disk space:%luG, Free Disk spae:%luG"

	condition:
		uint32be( 0 ) == 0x7f454c46 and filesize < 1MB and all of them
}