SigmaHQ Detections
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Detects when a role is modified or deleted in Google Workspace. This could indicate an attacker attempting to escalate privileges, maintain persistence, or disrupt services by altering administrative roles.
This rule detects attempts to extract passwords from files on Linux systems using the 'grep' command. It specifically looks for executions of 'grep' in conjunction with the keyword 'password', indicating a potential search for credentials.
This rule detects relevant ClamAV messages indicating the presence of various types of malware. It specifically looks for keywords like 'Trojan*FOUND', 'VirTool*FOUND', 'Webshell*FOUND', 'Rootkit*FOUND', and 'Htran*FOUND' in ClamAV logs. These keywords suggest that ClamAV has identified and reported a malicious file or component.
Detects the execution of the 'curl' command on Linux systems. This typically indicates an attempt to download files from a remote location or make web requests to external servers. This activity can be associated with adversaries transferring tools or communicating with command and control infrastructure.
This rule detects attempts to enumerate remote systems on a macOS host using the 'arp' and 'ping' utilities. Specifically, it looks for 'arp -a' commands, which list all current ARP entries, and 'ping' commands targeting common private IP address ranges (10.0.0.0/8, 192.168.0.0/16, 172.16.0.0/12) as well as localhost (127.0.0.0/8) and APIPA (169.254.0.0/16) ranges. This activity is indicative of an adversary performing network discovery to identify other systems for potential lateral movement.
Detects the use of the 'grep' utility on macOS to search for common security software names. This activity can indicate an adversary attempting to discover installed security solutions on a compromised system.
This rule detects when the macOS Script Editor application spawns child processes that are commonly used for malicious activities. Specifically, it looks for the Script Editor launching shell interpreters (bash, sh, zsh, dash, fish), scripting languages (python, perl, php, osascript), or utilities often leveraged in attack chains (curl, mktemp, chmod, nohup, openssl, plutil, PlistBuddy, xattr, sqlite, funzip, popen). This behavior can indicate an adversary using AppleScript or other scripting capabilities within Script Editor to execute arbitrary commands, download payloads, or manipulate system configurations.
This rule detects suspicious DNS queries specifically targeting 'api.telegram.org'. This domain is used by Telegram Bot API, which can be leveraged by various types of malware (e.g., RATs, ransomware) for command and control (C2) or data exfiltration. Monitoring these queries helps identify systems potentially communicating with malicious Telegram bots.
Detects attempts to exploit Java-based web applications by identifying common payload strings often used in vulnerabilities like those affecting Confluence (CVE-2022-26134, CVE-2021-26084) and other Java deserialization or expression language injection flaws. The rule looks for specific patterns in web access logs that indicate the presence of Java code execution attempts, such as references to Java classes, runtime execution commands, and encoded characters often used in exploit payloads.
Detects when a user account's User Account Control (UAC) flags are modified to enable weak encryption (DES) or disable Kerberos pre-authentication. This configuration can make the account vulnerable to Kerberoasting attacks, where an attacker can request a service ticket for the user and then offline crack the NTLM hash of the user's password if DES encryption is allowed, or if pre-authentication is disabled.
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