SigmaHQ Detections
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This rule identifies when secrets stored in Azure Key Vaults are modified or deleted. It specifically looks for operations such as writing, deleting, backing up, purging, updating, recovering, restoring, or setting secrets within Azure Key Vaults. This activity can indicate unauthorized access to sensitive credentials or an attempt to disrupt services by removing critical secrets.
This rule detects the use of the OAuth 2.0 device code authentication flow within an environment. While legitimate for input-constrained devices, its presence in other scenarios warrants investigation as it could indicate a misconfigured application or malicious activity. The rule specifically looks for "Device Code" in Azure sign-in logs.
This rule detects specific commands commonly used to remove or empty the syslog file on Linux systems. Adversaries may clear or modify system logs to remove evidence of their activities, hindering incident response and forensic analysis. The rule specifically looks for 'rm' commands with various flags (e.g., -r, -f, -rf) and 'mv' commands targeting '/var/log/syslog', as well as redirection to empty the file ('>/var/log/syslog').
Detects the installation of suspicious packages using common Linux package managers (apt, yum, rpm, dpkg). The rule specifically looks for keywords associated with network scanning, sniffing, and proxy tools, which could indicate reconnaissance, network analysis, or attempts to bypass network controls by an adversary.
Detects DNS TXT records containing strings commonly used for command execution, such as 'IEX' (Invoke-Expression), 'Invoke-Expression', and 'cmd.exe'. This technique can be used by adversaries for command and control (C2) or data exfiltration by embedding commands within DNS responses.
This rule detects the usage of cleartext protocols over a network by monitoring firewall logs for allowed connections to specific destination ports commonly associated with unencrypted services. These ports include HTTP (80, 8080), FTP (21), Telnet (23), and various database or application-specific ports (e.g., 1433, 3306, 1521, 27017, 50000, 11211, 15672, 5900-5904). The rule specifically looks for 'forward' or 'accept' actions, or connections not marked as 'blocked', indicating active cleartext communication. The primary goal is to identify potential credential exposure or sensitive data transmission over insecure channels.
Detects exploitation attempts targeting the VMware vCenter Server using the file upload vulnerability CVE-2021-22005. The rule specifically looks for POST requests to the '/analytics/telemetry/ph/api/hyper/send?' URI, which is indicative of an attempt to leverage this vulnerability for file upload.
Detects when a role privilege is deleted in Google Workspace. This could indicate an attempt to remove or modify administrative access, potentially as part of a privilege de-escalation by an attacker to avoid detection, or to clean up after an attack.
Detects when Microsoft Cloud App Security reports an unusual volume of file deletions by a user, which could indicate malicious activity such as data destruction or ransomware.
This rule detects access to specific '.lock' and '.pid' files in the '/var/run/' directory, which are known indicators of the BPFDoor backdoor. The rule specifically looks for access to 'haldrund.pid', 'xinetd.lock', and 'kdevrund.pid'.
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