Rule History

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/NitroStealer/exoStub CnC Exfil"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php"; http.request_body; content:"Content-Disposition|3a 20|form-data|3b 20|name=|22|file|22 3b 20|filename=|22|Upload.zip|22 0d 0a|"; fast_pattern; nocase; content:"screenshot"; nocase; distance:0; http.header_names; content:!"Referer"; content:!"User-Agent"; reference:md5,3594572488e00679a144001e24c675ab; classtype:trojan-activity; sid:2032417; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_04_02, deployment Perimeter, malware_family Win32_NitroStealer_exoStub, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_09_14;)