ET EXPLOIT Microsoft Exchange Remote Code Execution Attempt - OWASSRF (CVE-2022-41040, CVE-2022-41082)

alert http any any -> [$HOME_NET,$HTTP_SERVERS,$SMTP_SERVERS] any (
    msg:"ET EXPLOIT Microsoft Exchange Remote Code Execution Attempt - OWASSRF (CVE-2022-41040, CVE-2022-41082)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/owa/"; startswith; nocase;
    content:"@"; distance:0;
    content:"/powershell"; endswith; nocase; fast_pattern;
    http.user_agent;
    content:!"ClientInfo";
    content:!"Microsoft WinRM Client";
    content:!"Exchange BackEnd Probes";
    http.request_body;
    content:"|3c|s|3a|Envelope|20|xmlns|3a|rsp|3d 22|"; startswith;
    content:"wbem/wsman/1/windows/shell|22|"; within:100;
    content:"|3c|wsa|3a|To|3e|"; distance:0;
    content:"|3c|s|3a|Body|3e 3c|rsp|3a|Shell|20|ShellId|3d 22|"; distance:0;
    reference:url,www.crowdstrike.com/blog/owassrf-exploit-analysis-and-recommendations/;
    reference:url,github.com/CrowdStrike/OWASSRF/blob/main/Rps_Http-IOC.ps1;
    reference:cve,2022-41040;
    reference:cve,2022-41082;
    classtype:attempted-admin;
    sid:2043002; rev:1;
    metadata:affected_product Microsoft_Exchange, attack_target Server, created_at 2022_12_23, cve CVE_2022_41040_CVE_2022_41082, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Major, tag ProxyNotShell, tag CISA_KEV, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_12_23, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
)