BIOCs

Browse the Cortex behavioral indicator of compromise (BIOC) detection rules.

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4 BIOCs match the current filters. tactic: TA0001 ✕ technique: T1190 ✕

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  • Exchange process writing aspx files High Infiltration

    An exchange process is writing to .aspx files. This may be an actor dropping web shells.

    Indicator:

    File action type = create , write AND file path =~ (\\inetpub\\wwwroot\\aspnet_client\\|\\frontend\\httpproxy\\owa\\auth\\|\\frontend\\httpproxy\\ecp\\auth\\).*\.aspx Process initiated by = UMWorkerProcess.exe , w3wp.exe

    ATT&CK tactics: Initial Access (TA0001) Command and Control (TA0011)
    ATT&CK techniques: Exploit Public-Facing Application (T1190) Application Layer Protocol: Web Protocols (T1071.001)
    Preventable:
    Yes
    Source:
    Palo Alto Networks
    Updated:
    2026-08-23
  • Out of band testing domain connection Low Infiltration

    Connection from web service process to out-of-band-testing domain.

    Indicator:

    Network action type = outgoing , failed , raw_packet AND remote host =~ burpcollabat\.net|canarytokens\.com|dnslog\.cn|interact\.sh|interactsh\.com|oast\.fun|oast\.live|oast\.me|oast\.online|oast\.pro|oast\.site|oastify\.com|ptst\.io|r87\.me|requestbin\.net Process initiated by = apache.exe , apache2.exe , caddy.exe , httpd.exe , jsvc.exe , lighthttpd.exe , lighttpd.exe , lshttpd.exe , nginx.exe , nhttpd.exe , node.exe , php-cgi.exe , php.exe , tomcat.exe , tomcat7.exe , w3wp.exe , cgo name = apache.exe , apache2.exe , caddy.exe , httpd.exe , jsvc.exe , lighthttpd.exe , lighttpd.exe , lshttpd.exe , nginx.exe , nhttpd.exe , node.exe , php-cgi.exe , php.exe , tomcat.exe , tomcat7.exe , w3wp.exe , os parent name = apache.exe , apache2.exe , caddy.exe , httpd.exe , jsvc.exe , lighthttpd.exe , lighttpd.exe , lshttpd.exe , nginx.exe , nhttpd.exe , node.exe , php-cgi.exe , php.exe , tomcat.exe , tomcat7.exe , w3wp.exe

    ATT&CK tactics: Initial Access (TA0001)
    ATT&CK techniques: Exploit Public-Facing Application (T1190)
    Preventable:
    No
    Source:
    Palo Alto Networks
    Updated:
    2026-08-23
  • Web server process drops an executable to disk Informational Dropper

    Web server processes should not normally write executable files out to the local filesystem. This may have legitimate uses in certain web applications, yet check for possible exploitation of the hosted web application.

    Indicator:

    File file name = *.exe , *.scr , *.dll , *.sys , *.com , *.bin , *.msi AND action type = create Process initiated by = w3wp.exe , httpd.exe , nginx.exe , php-cgi.exe , initiated by = *apache* , *tomcat*

    ATT&CK tactics: Initial Access (TA0001)
    ATT&CK techniques: Exploit Public-Facing Application (T1190)
    Preventable:
    Yes
    Source:
    Palo Alto Networks
    Updated:
    2026-08-23
  • Web server spawns an unsigned process Informational Infiltration

    Web server processes should normally only carry out tasks related to serving web applications. This instance has spawned an unsigned process, which may indicate a successful exploitation attempt of the associated web application.

    Indicator:

    Process action type = execution AND process execution signature = Unsigned , Invalid Signature , N/A Process initiated by = w3wp.exe , httpd.exe , nginx.exe , php-cgi.exe , initiated by = *apache* , *tomcat* Host host os = windows

    ATT&CK tactics: Initial Access (TA0001)
    ATT&CK techniques: Exploit Public-Facing Application (T1190)
    Preventable:
    Yes
    Source:
    Palo Alto Networks
    Updated:
    2026-08-23