Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Detects instances where inst.exe running from C:\ProgramData\Intel with specific command-line arguments (extensionless and key-like) subsequently writes files to the EFI system partition or boot paths on the same device.
The following analytic detects modifications to the BootExecute registry key, which manages applications and services executed during system boot. It leverages data from the Endpoint.Registry data model, focusing on changes to the registry path "HKLM\\System\\CurrentControlSet\\Control\\Session Manager\\BootExecute". This activity is significant because unauthorized changes to this key can indicate attempts to achieve persistence, load malicious code, or tamper with the boot process. If confirmed malicious, this could allow an attacker to maintain persistence, execute arbitrary code at boot, or disrupt system operations.
This rule detects when a bootloader file is delivered via HTTP. It specifically looks for HTTP responses (flow:to_client) where the URI contains keywords like 'bootloader', 'grub', 'bootmgr', or 'mbr' (case-insensitive) and the file data contains the magic bytes '|55 AA|', which often indicate the end of a boot sector or a master boot record.
This rule detects attempts to push firmware or bootkit images to a device via a remote SSH session. It specifically looks for the commands 'dd if=' and '/dev/' within TCP traffic directed to port 22 (SSH), indicating an attempt to write data directly to a device file, which is a common method for flashing firmware or installing bootkits.
This rule detects multiple TFTP (Trivial File Transfer Protocol) transfers to port 69 on the home network within a short timeframe. Specifically, it triggers an alert if three or more TFTP transfers from the same source IP address occur within a 30-second window. This activity can be indicative of a Pre-Boot Execution Environment (PXE) boot process, which often uses TFTP to transfer boot files, or potentially malicious activity involving file transfers via TFTP.
Goal: Find machines in the last N days where the SystemGuardSecurityLevel value NOW is less than it was BEFORE.
Step 1: Get a list of all security levels in the system where the level is not null.
Step 1: Get a list of all security levels in the system where the level is not null.
'This hunting query identifies Zoom room systems with high CPU alerts that may be a sign of device compromise.'