SEKOIA_Apt_Muddywater_Powershell_Reverse_Secure_Proxy

rule SEKOIA_Apt_Muddywater_Powershell_Reverse_Secure_Proxy
{
	meta:
		description = "Detects PowerShell Reverse Secure Proxy"
		author = "Sekoia.io"
		id = "b255f327-cb56-41b7-82f7-83ee23f791a5"
		date = "2023-11-14"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/apt_muddywater_powershell_reverse_secure_proxy.yar#L1-L17"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "6507bc030d60af5559492bbb02bc619646306ab06c9bd9d3f78ae6ce55307bda"
		score = 75
		quality = 80
		tags = ""
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "$CS.Read($buff,4,2) | Out-Null" ascii wide
		$ = "$DP = $buff[2]*256 + $buff[3]" ascii wide
		$ = "$PS3.BeginInvoke() | Out-Null" ascii wide

	condition:
		all of them
}