RAT_Hizor.yar

/*
    This Yara ruleset is under the GNU-GPLv2 license (http://www.gnu.org/licenses/gpl-2.0.html) and open to any user or organization, as    long as you use it under this license.

*/
rule apt_win32_dll_rat_hiZor_RAT: RAT
{
	meta:
    description = "Detects hiZor RAT"
		hash1 = "75d3d1f23628122a64a2f1b7ef33f5cf"
		hash2 = "d9821468315ccd3b9ea03161566ef18e"
		hash3 = "b9af5f5fd434a65d7aa1b55f5441c90a"
    ref1 = "http://www.threatgeek.com/2016/01/introducing-hi-zor-rat.html"
    ref2 = "https://github.com/Neo23x0/Loki/blob/b187ed063d73d0defc6958100ca7ad04aa77fc12/signatures/apt_hizor_rat.yar"
    reference = "https://www.fidelissecurity.com/sites/default/files/FTA_1020_Fidelis_Inocnation_FINAL.pdf"
	strings:
		// Part of the encoded User-Agent = Mozilla
		$s1 = { c7 [5] 40 00 62 00 c7 [5] 77 00 64 00 c7 [5] 61 00 61 00 c7 [5] 6c 00 }

		// XOR to decode User-Agent after string stacking 0x10001630
		$s2 = { 66 [7] 0d 40 83 ?? ?? 7c ?? }

		// XOR with 0x2E - 0x10002EF6
		$s3 = { 80 [2] 2e 40 3b ?? 72 ?? }

		$s4 = "CmdProcessExited" wide ascii
		$s5 = "rootDir" wide ascii
		$s6 = "DllRegisterServer" wide ascii
		$s7 = "GetNativeSystemInfo" wide ascii
		$s8 = "%08x%08x%08x%08x" wide ascii
	condition:
		(uint16(0) == 0x5A4D or uint32(0) == 0x4464c457f) and (all of them)
}