DITEKSHEN_MALWARE_Win_Nemty

rule DITEKSHEN_MALWARE_Win_Nemty : FILE
{
	meta:
		description = "Detects Nemty/Nefilim ransomware"
		author = "ditekSHen"
		id = "361269c6-5215-5ecf-869c-3c55ff8387e1"
		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#L3553-L3577"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "dcebcddc472f4fb3bb34c35fc5a5424e54bfc3a262fdae10b189d210217b9b37"
		score = 75
		quality = 75
		tags = "FILE"

	strings:
		$s1 = "Go build ID:" ascii
		$s2 = "GOMAXPROCSGetIfEntryGetVersionGlagoliticKharoshthiManichaeanOld_ItalicOld_PermicOld_TurkicOther_MathPOSTALCODEPhoenicianSaurasht" ascii
		$s3 = "crypto/x509.ExtKeyUsage" ascii
		$s4 = "crypto/x509.KeyUsageContentCommitment" ascii
		$s5 = "DEK-Info header" ascii
		$s6 = "GetUserProfileDirectoryWMagallanes Standard TimeMontevideo Standard TimeNorth Asia Standard TimePacific SA Standard TimeQueryPerformanceCounter" fullword ascii
		$s7 = "*( -  <  =  >  k= m=%: +00+03+04+05+06+07+08+09+10+11+12+13+14-01-02-03-04-05-06-08-09-11-12..." ascii
		$s8 = "Go cmd/compile go1.10" fullword ascii
		$s9 = ".dllprogramdatarecycle.bin" ascii
		$s10 = ".dll.exe.lnk.sys.url" ascii
		$vx1_1 = "Fa1led to os.OpenFile()" ascii
		$vx1_2 = "-HELP.txt" ascii
		$vf1_1 = "main.CTREncrypt" fullword ascii
		$vf1_2 = "main.FileSearch" fullword ascii
		$vf1_3 = "main.getdrives" fullword ascii
		$vf1_4 = "main.RSAEncrypt" fullword ascii
		$vf1_5 = "main.SaveNote" fullword ascii

	condition:
		uint16( 0 ) == 0x5a4d and ( 9 of ( $s* ) or ( all of ( $vx* ) and 2 of ( $s* ) ) or all of ( $vf* ) )
}