Sigma Rules
55 rules found
CVE-2023-4966 Potential Exploitation Attempt - Citrix ADC Sensitive Information Disclosure - Proxy
Detects potential exploitation attempt of CVE-2023-4966 a Citrix ADC and NetScaler Gateway sensitive information disclosure vulnerability via proxy logs.
Potential Compromised 3CXDesktopApp Beaconing Activity - Proxy
Detects potential beaconing activity to domains related to 3CX 3CXDesktopApp compromise
Potential Compromised 3CXDesktopApp ICO C2 File Download
Detects potential malicious .ICO files download from a compromised 3CXDesktopApp via web requests to the the malicious Github repository
Potential Operation Triangulation C2 Beaconing Activity - Proxy
Detects potential beaconing activity to domains used in 0day attacks on iOS devices and revealed by Kaspersky and the FSB
Potential Peach Sandstorm APT C2 Communication Activity
Detects potential C2 communication activity related to Peach Sandstorm APT
Cisco ASA Exploitation Activity - Proxy
Detects suspicious requests to Cisco ASA WebVpn via proxy logs associated with CVE-2025-20333 and CVE-2025-20362 exploitation.
.Class Extension URI Ending Request
Detects requests to URI ending with the ".class" extension in proxy logs. This could rules can be used to hunt for potential downloads of Java classes as seen for example in Log4shell exploitation attacks against Log4j.