SEKOIA_Apt_Apt28_Powershell_Ntlm_Stealer

rule SEKOIA_Apt_Apt28_Powershell_Ntlm_Stealer : FILE
{
	meta:
		description = "Detects the NTLM Stealer used by APT28 against UA energy sector"
		author = "Sekoia.io"
		id = "3fb5c472-6b1c-490e-b38f-4d4f1c472f43"
		date = "2023-09-07"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/apt_apt28_powershell_ntlm_stealer.yar#L1-L19"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "29d039bf7d7018ebbae187ae0f057161c3f9256076324f06167872adc0accfa7"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "'NTLM ' = [Convert]::ToBase64String"
		$ = ".Prefixes.Add('http://localhost:8080/')"
		$ = ".AddHeader('WWW-Authenticate', 'NTLM')"
		$ = "GetValues('Authorization');"
		$ = "[0] -split '\\s+';"

	condition:
		3 of them and filesize < 4000
}