DITEKSHEN_MALWARE_Win_Nitol

rule DITEKSHEN_MALWARE_Win_Nitol : FILE
{
	meta:
		description = "Detects Nitol backdoor"
		author = "ditekSHen"
		id = "d545f826-11ff-5d0f-9a95-8232b19d35b6"
		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#L3676-L3704"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "c0ddcd6179bea2f3af77ae198e07f55f62884e07a975623ae41bcec163060f89"
		score = 75
		quality = 73
		tags = "FILE"

	strings:
		$s1 = "%$#@!.aspGET ^&*().htmlGET" ascii
		$s2 = "Applications\\iexplore.exe\\shell\\open\\command" fullword ascii
		$s3 = "taskkill /f /im rundll32.exe" fullword ascii
		$s4 = "\\Tencent\\Users\\*.*" fullword ascii
		$s5 = "[Pause Break]" fullword ascii
		$s6 = ":]%d-%d-%d  %d:%d:%d" fullword ascii
		$s7 = "GET %s HTTP/1.1" fullword ascii
		$s8 = "GET %s%s HTTP/1.1" fullword ascii
		$s9 = "Accept-Language: zh-cn" fullword ascii
		$s10 = "User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows 5.1)" fullword ascii
		$s11 = "User-Agent:Mozilla/4.0 (compatible; MSIE %d.00; Windows NT %d.0; MyIE 3.01)" fullword ascii
		$s12 = "User-Agent:Mozilla/4.0 (compatible; MSIE %d.0; Windows NT %d.1; SV1)" fullword ascii
		$w1 = ".aspGET" ascii
		$w2 = ".htmGET" ascii
		$w3 = ".htmlGET" ascii
		$domain = "www.xy999.com" fullword ascii
		$v2_1 = "loglass" fullword ascii
		$v2_2 = "rlehgs" fullword ascii
		$v2_3 = "eherrali" fullword ascii
		$v2_4 = "agesrlu" fullword ascii
		$v2_5 = "lepejagas" fullword ascii

	condition:
		uint16( 0 ) == 0x5a4d and ( 5 of ( $s* ) or ( all of ( $v2* ) ) or ( $domain and 3 of them ) or ( #w1 > 2 and #w2 > 2 and #w3 > 2 and 3 of ( $s* ) ) )
}