Ankit Mehta
@SecvynIndiaTrusted contributorCompletionist
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8,664 detections
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Detects instances where WinRAR.exe is observed writing potentially malicious script or link files (.hta, .vbs, .js, .ps1, .lnk) into the Windows Startup folder. This pattern is indicative of exploitation of CVE-2025-8088, a path traversal vulnerability in WinRAR often leveraged by the Gamaredon group to establish persistence.
This rule detects anomalous or risky sign-in events for user accounts that have recently configured an active out-of-office (OOF) auto-reply. An attacker may leverage a user's known absence to gain access to their email or other corporate resources using compromised credentials, as the user is less likely to notice suspicious account activity while away.
This rule monitors for inbound email messages containing SVG file attachments. SVG files can contain embedded scripts that may be leveraged for malicious purposes, such as SVG smuggling to deliver secondary payloads or perform credential harvesting.
Detects network traffic associated with known Cobalt Strike Beacon request URI patterns. This rule utilizes network signature inspection to flag outbound connections containing URI fragments commonly used by Cobalt Strike default profiles.
Detects the execution of specific Python scripts associated with the FortiBleed campaign. These scripts include 'spray_da.py' for domain admin password spraying, 'smb_test.py' for SMB validation and lateral movement, 'spider.py' for Active Directory crawling, and 'ad_full_audit.py' for Active Directory auditing. Detection is based on the Python interpreter executing these specific script filenames.
This rule detects potential data exfiltration attempts by monitoring for network connections to URLs containing suspicious substrings (bit, onion, .cc, .su) over common web and DNS ports (53, 80, 443, 8080). It flags high-frequency unique connection attempts from a single device, which may indicate command-and-control (C2) traffic or data exfiltration over covert channels.
This rule detects network connections from internal devices to identified APT Command and Control (C2) IP address ranges over common ports (8080, 443, 21, 22, 23, 25, 445). This traffic pattern is indicative of unauthorized external communication commonly associated with malware or adversary activity.
This rule detects the creation or modification of at least 10 files within an hour that have the '.prinzeugen' extension, which is indicative of the Prinz Eugen ransomware encrypting files using ChaCha20.
This rule detects potential cloud resource hijacking (e.g., cryptojacking) by monitoring for a sudden spike in the deployment of Azure virtual machines by a single user. It triggers if a user creates five or more virtual machines in a 10-minute window, specifically looking for deployments in regions where the user has not recently created VMs, or deployments utilizing high-compute SKUs commonly targeted for cryptocurrency mining.
Detects high-impact configuration changes to Azure management groups or subscriptions (e.g., write/delete operations) that are performed by non-privileged accounts or outside of defined business change windows. This activity can indicate unauthorized privilege escalation, resource manipulation, or reconnaissance by an adversary.