Ibrahim Saud
@tektrixIndiaCompletionist
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Detects the IIS worker process (w3wp.exe) used by SharePoint loading a specific combination of assemblies (PresentationFramework.dll, System.Xaml.dll, and System.Data.Services.dll). This behavior is indicative of an ExpandedWrapper/XamlServices.Parse() insecure deserialization gadget chain, typically associated with the exploitation of vulnerabilities like CVE-2026-65660, which enables fileless in-memory code execution.
Detects DNS queries for domains resolving to specific Cloudflare nameserver pairs associated with the Exvicy malware distribution framework. The rule monitors for NS records pointing to 'randy.ns.cloudflare.com' and 'stevie.ns.cloudflare.com', optionally filtering by domains containing keywords commonly used in Exvicy-themed phishing or C2 infrastructure.
Detects instances where the SharePoint IIS worker process (w3wp.exe) initiates command interpreters or known living-off-the-land binaries (LOLBins). This behavior is characteristic of post-exploitation activity, such as command execution following successful exploitation of SharePoint vulnerabilities involving insecure deserialization or malicious directive injection.
Detects HTTP POST requests directed to the '/api.php' endpoint with specific patterns characteristic of Exvicy/ClickFix malware C2 communication. The rule identifies suspicious action parameters (check, dl, or cb) and a specific 48-character hexadecimal 'k' parameter used for identifying infected state.
This rule detects suspicious outbound network connections originating from processes frequently abused in the Exvicy/ErrTraffic ClickFix malware delivery chain, specifically powershell.exe, msiexec.exe, and putty.exe. It also monitors for direct communication to known C2 IP addresses associated with the Exvicy threat actor, providing coverage for both the initial payload delivery and post-compromise C2 phases.
Detects outbound network traffic from internal hosts to a domain associated with the VelvetCake fileless malware variant. The rule specifically looks for HTTP requests to 'p1o2i3u4y5t6r7e8w9q0.medianewsonline.com' using specific login parameters ('Areyou=cake', 'OKey=', 'Who='), which is indicative of command and control activity linked to the Konni actor group.
Detects instances where Chrome or Microsoft Edge processes are spawned from suspicious AppData subdirectories that do not match standard installation paths. This behavior is indicative of credential theft malware, such as RevStealer, which launches browser processes as debugged child processes from unique working directories to recover App-Bound encryption keys.
Detects unauthorized processes reading sensitive Chromium-based browser files (e.g., Cookies, Login Data) immediately following the termination of a browser process. This behavior is indicative of credential harvesting malware, such as RevStealer, which terminates the browser to release file locks before exfiltrating the databases.
Detects a single process accessing files across three or more distinct cryptocurrency wallet application directories within a one-hour window. This behavior is highly anomalous for legitimate applications and is characteristic of information-stealing malware, such as RevStealer, which targets stored credentials and wallet files.
Detects outbound HTTP POST requests to the 'vpugy.vcqi' domain, which is associated with RevStealer malware exfiltration. The rule specifically looks for traffic using a spoofed Chrome/147 user-agent and specific cookie artifacts used for session tracking in the exfiltration communication.
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