SigmaHQ Detections
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6,797 detections
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Clear Linux Logs
Sigma
Detects attempts to clear logs on the system by identifying command-line executions of 'rm', 'shred', or 'unlink' targeting common log directories like '/var/log' and '/var/spool/mail'. Adversaries may clear system logs to hide evidence of an intrusion.
Detects scenarios where a potentially unauthorized application or user modifies the system time. This can be an indicator of defense evasion or an attempt to disrupt system operations or forensic analysis.
Detects lateral movement activity using various Impacket tools such as wmiexec, dcomexec, atexec, and smbexec. The rule identifies specific parent processes and command-line arguments indicative of these tools, which often involve `cmd.exe` executing commands with output redirection to a local loopback address.
This rule detects suspicious DNS queries where the Z flag bit in the DNS protocol header is set to a non-zero value. The Z flag is reserved (unused) per IETF design, though it has recently been used in DNSSec. A non-zero Z flag value should be rare outside of legitimate DNSSec usage. The rule includes exclusions for common TLDs, query types (NS, MX), responses, and NetBIOS related traffic to reduce false positives. The rule's intent is to identify potential command and control (C2) or data exfiltration attempts leveraging DNS anomalies.
Detects the installation of services that are characteristic of Metasploit's SMB PsExec module (exploit/windows/smb/psexec) and Impacket's psexec.py. The rule specifically looks for Windows Security Event ID 4697 (A service was installed in the system) where the ServiceFileName matches a pattern of '%systemroot%\<8_random_chars>.exe' and the ServiceName matches a pattern of 4, 8, or 16 alphabetic characters, while excluding the known legitimate 'PSEXESVC' service.
This rule detects PowerShell script block text that attempts to modify file timestamps (creation, last write, or last access times). This technique, known as timestomping, is often used by adversaries to hide new or modified files by making them appear to have older timestamps, blending them with legitimate files on the system.
Detects suspicious inbox manipulation rules that are set on a user's mailbox to delete or move messages or folders. This often indicates an attacker is trying to hide their activities or exfiltrate data by automatically moving emails.
Detects when Microsoft Cloud App Security reports activities performed by users whose accounts have been terminated in Azure AD, but are still active in other platforms like AWS or Salesforce. This is particularly relevant for accounts used to manage resources that might not be terminated when a user leaves the company.
This rule detects specific command-line activities associated with the Turla APT group's lateral movement and discovery tactics. It looks for the use of 'net use' to connect to administrative shares (specifically C$) with a hardcoded password, and 'dir' commands used for file and directory discovery, targeting document files and executables in the TEMP directory. These commands are indicative of an adversary attempting to move laterally within a network and gather information about the environment.
This rule detects suspicious error messages generated by various SQL database systems (Oracle, MySQL, SQL Server, SQLite) that are indicative of an attempted SQL injection attack. The rule looks for specific syntax error messages that are commonly returned when an attacker probes for SQL injection vulnerabilities.
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