Ankit Mehta
@SecvynIndiaTrusted contributorCompletionist
8 followers9,573 downloads10,240 copies160 likes55,485 views
8,655 detections
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This rule detects attempts to delete shadow copies or system backups using built-in Windows utilities like vssadmin.exe, wbadmin.exe, and diskshadow.exe. These actions are often associated with ransomware behavior to prevent system recovery.
This rule detects the creation of scheduled tasks using `schtasks.exe` or `at.exe` with specific command-line arguments (`/create`, `/tn`, and either `/ru` or `/tr`). It then correlates these process events with registry events related to Task Scheduler keys or values containing "Task" to identify potential persistence mechanisms.
This rule detects the download of JavaScript (.js) or HTML Application (.hta) files followed by the execution of scripting interpreters like mshta, cscript, wscript, node, or powershell with encoded commands on the same device within a one-hour window. It assigns a score based on the count of downloaded files and executed scripts, triggering an alert if the combined score exceeds 2. This behavior is indicative of potential malicious script execution, often seen in initial access or execution phases of an attack.
This rule detects when a file, initially received as an email attachment, is subsequently observed on multiple endpoints within a 7-day period. It correlates SHA256 hashes from email attachment logs with device file events to identify widespread propagation of potentially malicious attachments.
This rule detects emails with subjects related to financial transactions (Invoice, Purchase Order, PO, Payment, Order) that contain attachments with suspicious file extensions (.js, .hta, .vbs). It specifically filters for emails originating from domains not whitelisted as trusted and aggregates the count and average size of such attachments.
Detects excessive access or modification of virtualization-related files including VMDK, VHD, VHDX, and VMX files. VECT ransomware supports attacks against virtualized environments and may target virtual machine disks to maximize operational disruption and business impact.
This rule detects suspicious activity involving PowerShell downloading content (using Invoke-WebRequest, iex, or DownloadString) followed by the creation of specific suspicious files (Browser Update.exe, update.zip, update.msi) on the same device within a 10-minute window. This correlation suggests a potential ingress of malicious tools or updates.
Identifies network traffic to a specific malicious Google Firestore project ('braintree-payment-app') used by a Magecart campaign for C2 and data exfiltration.
This rule detects potential ransomware activity by identifying a high volume of file encryption events. It looks for files being renamed or created with common ransomware-related extensions such as '.locked', '.crypt', '.encrypted', '.enc', or a generic pattern of a 6 or more character alphanumeric extension. The rule then counts these events within one-hour bins and alerts if more than 20 such files are detected in a single folder path.
This rule detects potential command and control (C2) communications over non-standard ports. It identifies devices that make a high number of network connections to distinct remote IP addresses on ports other than common ones (80, 443, 53, 22, 21, 25, 110, 143, 993, 995) and not to private IP ranges. The rule aggregates connection counts and distinct remote IPs over 15-minute intervals and flags activity where there are more than 30 connections and more than 2 distinct remote IPs.
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