Tim Peck
@timpeckTrusted contributorCompletionist
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This rule detects an attempted exploitation of an insecure deserialization vulnerability (CVE-2025-10035) in Fortra GoAnywhere MFT. Specifically, it looks for HTTP POST requests to the '/goanywhere/lic/accept/' URI containing the string 'bundle=' in the request body, which is indicative of an attempt to trigger the vulnerability.
This rule detects HTTP POST requests to github.com's /login/device/code endpoint that contain a 'client_id=' in the request body. This pattern is indicative of a device code authentication flow, which could be leveraged in phishing attacks (device code phishing) to steal application access tokens.
ET INFO WatchGuard Fireware OS IKEv2 Unauthenticated Vulnerable Version Disclosure (CVE-2025-9242)
This rule detects the 'Zip Slip' vulnerability pattern within TAR archive uploads. Specifically, it looks for the sequence '../' (dot dot slash) in the file data of a TAR archive, which indicates an attempt to traverse directories and potentially write files outside the intended extraction directory. This is a common technique used in Zip Slip attacks to achieve arbitrary file write.
This rule detects HTTP requests to the '.well-known/' directory that include common webshell file extensions (php, cfm, cgi, asp, aspx, jsp, rb, sh, py, pl). This activity is suspicious as the '.well-known/' directory is typically used for standardized metadata files (e.g., for ACME challenges, security.txt) and not for executable scripts. The rule specifically excludes requests from 'Let's Encrypt validation server' to reduce false positives.
This rule detects HTTP traffic originating from a client within the home network to an external Cloudflare tunneling service (specifically, domains ending in '.trycloudflare.com') where the User-Agent header indicates 'Microsoft-WebDAV-MiniRedir'. This combination suggests potential command and control activity or data exfiltration using WebDAV over a Cloudflare tunnel, often employed by adversaries to bypass network restrictions and obscure their infrastructure.
This rule detects attempts to retrieve PowerShell scripts (.ps1) from an external server using WebDAV (PROPFIND method) with a 'Microsoft-WebDAV-MiniRedir/' user agent. This activity is often associated with adversaries attempting to transfer tools or malicious scripts into a compromised environment.
ET MALWARE TA569 Gholoader CnC Domain in DNS Lookup (secure .kasindramaharaj .com)
This rule detects attempts to exploit CVE-2021-20021, an unauthenticated arbitrary user creation vulnerability in SonicWall Email Security. The rule specifically looks for HTTP POST requests to the '/createou' URI with 'data=' in the request body, indicating an attempt to create a new organizational unit or user.
ET INFO Observed RMM Domain in DNS Lookup (meshcentral .com)
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