DITEKSHEN_MALWARE_Linux_Getshell

rule DITEKSHEN_MALWARE_Linux_Getshell : FILE
{
	meta:
		description = "Detect GetShell Linux backdoor"
		author = "ditekSHen"
		id = "cccad93d-cd49-5237-96ac-66c9ac6ef532"
		date = "2020-11-06"
		modified = "2024-11-01"
		reference = "https://github.com/ditekshen/detection"
		source_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/yara/malware.yar#L10705-L10725"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "9d44ad2a3c270eed0e905402e8c32dcca54da90f4229d9d59874ee09b3b47277"
		score = 75
		quality = 75
		tags = "FILE"
		clamav1 = "MALWARE.Linux.Trojan.GetShell"

	strings:
		$x1 = "cat <(echo '@reboot echo socks5_backconnect" ascii
		$x2 = "(cd  && )') <(sed '/socks5_backconnect" ascii
		$s1 = "cat <(echo '@" ascii
		$s2 = "(cd  && )') <(sed '" ascii
		$s3 = "PORT1:" ascii
		$s4 = "HOST1:" ascii
		$s5 = "queryheader" ascii
		$s6 = "qsectionpost" ascii
		$s7 = "packedip" ascii
		$s8 = "copydata" ascii
		$s9 = "synsend" ascii
		$s10 = "bc_connect" ascii

	condition:
		uint16( 0 ) == 0x457f and ( ( all of ( $x* ) and 1 of ( $s* ) ) or 5 of ( $s* ) )
}