SigmaHQ Detections
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6,797 detections
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This rule detects the use of legacy authentication protocols for sign-ins to Azure AD. Legacy authentication protocols (such as POP3, IMAP, SMTP, MAPI, Exchange ActiveSync, Exchange Web Services, and 'Other client') do not support modern security features like Multi-Factor Authentication (MFA) and are often targeted by attackers for credential stuffing, brute-force attacks, and other credential-based attacks. Detecting and alerting on these sign-ins helps identify potential compromise or policy violations.
Detects calls to hidden files or files located in hidden directories in Linux systems. This rule specifically looks for file paths containing '/.' which is a common convention for hidden files and directories in Unix-like systems, while filtering out common legitimate hidden paths like '.cache' and '.config'.
This rule detects the execution of scheduled tasks that launch specific, potentially suspicious, Living Off The Land Binaries (LOLBINs) or other uncommon programs. The detection focuses on programs like calc.exe, cscript.exe, mshta.exe, mspaint.exe, notepad.exe, regsvr32.exe, and wscript.exe when they are initiated by the Task Scheduler. The intent is to identify potentially malicious activity where adversaries might use scheduled tasks for persistence, execution, or privilege escalation by leveraging legitimate system utilities in an unusual context.
Detects the addition of a Security Support Provider (SSP) to the Windows registry. When an SSP DLL is loaded into the Local Security Authority (LSA) process, typically upon system reboot or via an API call, it gains access to encrypted and plaintext passwords stored in Windows. This technique is often used for persistence and credential access.
Detects execution of EDR-Freeze, a tool that exploits the MiniDumpWriteDump function and WerFaultSecure.exe to suspend EDR and Antivirus processes on Windows. EDR-Freeze leverages a race-condition attack to put security processes into a dormant state by suspending WerFaultSecure at the moment it freezes the target process. This technique does not require kernel-level exploits or BYOVD, but instead abuses user-mode functionality to temporarily disable monitoring by EDR or Antimalware solutions.
Detects the creation of suspicious files associated with Proof-of-Concept (PoC) exploits targeting the Windows Print Spooler Remote Code Execution Vulnerabilities, specifically CVE-2021-34527 (PrinterNightmare) and CVE-2021-1675. The rule looks for file creations within the ':\Windows\System32\spool\drivers\x64\' directory, which is a known location for files dropped by these exploits.
This rule detects the loading of known malicious drivers by their file names. Adversaries often use malicious drivers for persistence, privilege escalation, or to evade defenses. The rule specifically looks for a predefined list of driver filenames that have been identified as malicious or associated with vulnerable drivers exploited by attackers. This detection is based on the 'ImageLoaded' field, which indicates when a driver is loaded into the system.
Detects chromium-based browsers starting in headless and debugging mode while pointing to a user profile. This behavior can be indicative of data exfiltration, specifically cookie stealing, or remote control of the browser.
Detects the renaming of an existing computer account to an account name that doesn't contain a '$' symbol, which is a key indicator of the CVE-2021-42287 (SamAccountName Spoofing) attack. This technique is often used to impersonate a Domain Controller.
Detects the execution of 'curl.exe' with command-line arguments indicating the use of SOCKS proxies (socks5h, socks5, socks4a) and targeting '.onion' domains. This combination is highly indicative of activity associated with the Kalambur backdoor, which leverages TOR for command and control.
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