SigmaHQ Detections
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Detects the execution of the 'esxcli' command with the 'storage' flag to retrieve information about storage status on VMware ESXi systems. This activity has been observed in malware campaigns, including DarkSide and LockBit ransomware.
Detects the execution of the "esxcli" command with the "vsan" flag to gather information about virtual storage on VMware ESXi systems. This activity has been observed in malware campaigns, including DarkSide and LockBit ransomware, indicating potential reconnaissance or preparation for impact on virtualized environments.
Detects potential exploitation of a chained vulnerability attack targeting Ivanti EPMM 12.5.0.0. CVE-2025-4427 allows unauthenticated access to protected API endpoints via an authentication bypass, which can then be leveraged to trigger CVE-2025-4428 — a remote code execution vulnerability through template injection. This sequence enables unauthenticated remote code execution, significantly increasing the impact of exploitation.
This rule detects suspicious usage of the 'curl' command on Linux systems that indicates a file upload or data transfer to a web service. It specifically looks for the 'curl' executable being run with command-line arguments such as '--form', '--upload-file', '--data', or their variations ('--data-ascii', '--data-binary', '--data-raw', '--data-urlencode'), or the shorthand options '-F', '-T', '-d'. The rule filters out connections to localhost or 127.0.0.1 to reduce false positives from legitimate local development or testing activities.
Detects the Kapeka Backdoor binary being loaded by rundll32.exe. The Kapeka loader drops a backdoor, which is a DLL with the '.wll' extension masquerading as a Microsoft Word Add-In. The rule specifically looks for rundll32.exe loading a DLL with a '.wll' extension from common user-writable directories like ProgramData or AppData\Local.
Detects "BugCheck" errors indicating the system rebooted due to a crash, capturing the bugcheck code, dump file path, and report ID. This event can be leveraged by adversaries to obtain crash dumps which may contain sensitive information, including credentials.
This rule detects the execution of common archiving utilities (zip, gzip, tar) on Linux systems. Adversaries often compress data prior to exfiltration to reduce its size and make it easier to transfer. This rule specifically looks for the 'execve' system call with 'zip', 'gzip -k', or 'tar -c' as the primary command and arguments.
Detects changes to the ESXi syslog configuration via the 'esxcli' command-line utility. This activity could indicate an adversary attempting to impair defenses by modifying logging configurations on an ESXi hypervisor.
Detects failed logon attempts to MSSQL server instances, which can indicate brute-force attacks, password guessing, or credential stuffing attempts against database accounts. This rule specifically looks for Event ID 18456 from MSSQL providers in the Windows Application event log.
This rule detects potential DCShadow attacks by looking for the creation of new Service Principal Names (SPNs) that contain 'GC/' in either Event ID 4742 (A computer account was changed) or Event ID 5136 (A directory service object was modified). DCShadow is a technique used by adversaries to register a rogue Domain Controller and manipulate Active Directory data.
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