VOLEXITY_Malware_Win_Iis_Shellsave

rule VOLEXITY_Malware_Win_Iis_Shellsave : WHEELEDASH FILE MEMORY
{
	meta:
		description = "Detects an AutoIT backdoor designed to run on IIS servers and to install a webshell."
		author = "threatintel@volexity.com"
		id = "a89defa5-4b22-5650-a0c0-f4b3cf3377a7"
		date = "2021-11-17"
		modified = "2023-08-17"
		reference = "https://github.com/volexity/threat-intel"
		source_url = "https://github.com/volexity/threat-intel/blob/3a9d0b52459877ee866a9a0ba06e60059b778c77/2021/2021-12-06 - XEGroup/indicators/yara.yar#L27-L49"
		license_url = "https://github.com/volexity/threat-intel/blob/3a9d0b52459877ee866a9a0ba06e60059b778c77/LICENSE.txt"
		hash = "21683e02e11c166d0cf616ff9a1a4405598db7f4adfc87b205082ae94f83c742"
		logic_hash = "f34d6f4ecaa4cde5965f6b0deac55c7133a2be96f5c466f34775be6e7f730493"
		score = 75
		quality = 80
		tags = "WHEELEDASH, FILE, MEMORY"
		scan_context = "file,memory"
		severity = "high"
		license = "See license at https://github.com/volexity/threat-intel/blob/main/LICENSE.txt"
		rule_id = 6146
		version = 4

	strings:
		$s1 = "getdownloadshell" ascii
		$s2 = "deleteisme" ascii
		$s3 = "sitepapplication" ascii
		$s4 = "getapplicationpool" ascii

	condition:
		all of them
}