SigmaHQ Detections
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Detects the creation of scheduled tasks by the Kapeka backdoor. This rule specifically looks for Event ID 4698 (A scheduled task was created) and then filters on specific content within the TaskContent field, including common Kapeka-related paths like ':\ProgramData\' or '\AppData\Local\', the presence of 'rundll32', '.wll', and '#1' in the command line, and task names such as 'OneDrive' or 'Sens Api'.
Detects the execution of the 'mount' command with the 'hidepid=2' option. This parameter is used to hide processes from other users on the system, which can be leveraged by adversaries for defense evasion by making their malicious processes less visible.
Detects the execution of hacktools developed by 'Cube0x0' by identifying the 'Company' field in the executable's PE metadata. This allows detection even if the tool's filename has been changed. Examples of tools by this author include SharpPrintNightmare, KrbRelay, and SharpMapExec, which are often used for credential access and resource development.
Detects potential exploitation attempt of CVE-2023-1389, an Unauthenticated Command Injection vulnerability in TP-Link Archer AX21 routers. The rule looks for specific URI patterns and keywords indicative of an attempt to inject commands via the 'country' parameter.
This rule detects attempts to delete Windows Volume Shadow Copies using PowerShell commands that interact with WMI (Windows Management Instrumentation). Specifically, it looks for PowerShell scripts containing `Get-WmiObject`, `gwmi`, `Get-CimInstance`, or `gcim` in conjunction with `Win32_ShadowCopy` and a deletion method like `.Delete()`, `Remove-WmiObject`, `rwmi`, `Remove-CimInstance`, or `rcim`. This technique is commonly employed by ransomware families, such as Sodinokibi/REvil, to prevent system recovery.
Detects uncommon outbound network activity via Kerberos default port (88) indicating possible lateral movement or initial privilege escalation through delegation. The rule specifically filters out common legitimate processes like LSASS, Chrome, Firefox, and Tomcat that might generate similar network activity, aiming to reduce false positives.
This rule detects the creation of specific files associated with the Kapeka backdoor. It looks for files created in common application data directories (ProgramData or AppData\Local) that have a 5-6 character alphanumeric name followed by a ".wll" extension. Additionally, it specifically looks for files named "win32log.exe" or "crdss.exe" in these locations, which are known indicators of the Kapeka backdoor. The Kapeka dropper disguises these files as legitimate to evade detection.
This rule detects network connections initiated by an executable to sub-domains associated with the "LocaltoNet" tunneling service. LocaltoNet is a reverse proxy that exposes localhost services to the internet. Adversaries have been observed leveraging this service for command-and-control (C2) activities, often to bypass multi-factor authentication (MFA) and perimeter security controls.
Detects the creation of new pods within the `kube-system` namespace. This activity is suspicious because attackers might create pods with names similar to legitimate system components (e.g., `kube-proxy-bv61v`) to masquerade as system pods and evade detection. Legitimate system pods created by controllers typically have random suffixes in their names. This rule specifically looks for `create` operations on `pods` within the `kube-system` namespace.
Detects creation of new Kubernetes service account, which could indicate an attacker's attempt to persist within a cluster.
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