SigmaHQ Detections
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6,797 detections
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This rule detects potential SQL injection attempts by looking for common SQL injection strings and keywords within the URI of GET requests in web server access logs. It specifically targets patterns often used to extract database information, bypass authentication, or execute arbitrary SQL commands.
This rule detects attempts to execute common Windows operating system commands via HTTP GET requests, which is a common characteristic of web shell activity. The rule specifically looks for URL-encoded versions of commands like 'whoami', 'net user', 'cmd /c', 'powershell', 'tasklist', 'wmic', 'ssh', 'python', 'ipconfig', 'wget', 'curl', 'certutil', 'copy \\', 'dsquery', and 'nltest'. These commands are often used by attackers to gain information about the compromised system, escalate privileges, or establish further persistence after deploying a web shell.
This rule detects the use of potentially suspicious keywords within PowerShell scripts that are often associated with exploitation frameworks or advanced attack techniques. Specifically, it looks for reflection-related keywords like 'System.Reflection.Assembly.Load', '[System.Reflection.Assembly]::Load', '[Reflection.Assembly]::Load', 'System.Reflection.AssemblyName', 'Reflection.Emit.AssemblyBuilderAccess', 'Reflection.Emit.CustomAttributeBuilder', and keywords related to interop services and process manipulation such as 'Runtime.InteropServices.UnmanagedType', 'Runtime.InteropServices.DllImportAttribute', 'SuspendThread', and 'rundll32'. These keywords can indicate attempts to load assemblies in-memory, interact with unmanaged code, or manipulate processes, which are common tactics used by malware and red teaming tools.
This rule detects when an AWS EC2 snapshot's permissions are modified to allow access from another AWS account. This activity can indicate an attempt to exfiltrate data stored in the snapshot by sharing it with an adversary-controlled account.
This rule identifies when an owner is removed from an application or service principal within Azure Active Directory. This activity could indicate an attempt to remove legitimate administrative access or to obscure malicious activity by removing an owner who might detect it.
This rule detects the use of 'dd' and 'truncate' commands to add junk data to a file, a technique adversaries may employ for binary padding to evade detection. Specifically, it looks for 'truncate' with the '-s' (size) option or 'dd' with 'if=' (input file) but without 'of=' (output file), indicating potential in-place modification or padding.
Detects the creation of a new user account on Linux systems. Such accounts may be used for persistence that do not require persistent remote access tools to be deployed on the system. The rule specifically looks for 'SYSCALL' events where the executable ends with '/useradd' or 'ADD_USER' record types from auditd logs.
Detects the execution of the 'groupdel' command, which is used to delete a group on Linux systems. This activity can be abused by threat actors to remove evidence of their presence or to disrupt legitimate user access by deleting groups.
This rule detects attempts to bypass macOS Gatekeeper by removing the 'com.apple.quarantine' extended attribute from a file using the 'xattr' utility. This action prevents Gatekeeper from performing its security checks on the file, allowing untrusted applications to execute without user prompts.
This rule detects the execution of the 'xp_cmdshell' stored procedure within Microsoft SQL Server. 'xp_cmdshell' allows SQL Server to execute operating system commands directly, which is a common technique used by attackers for privilege escalation, lateral movement, and persistence within a compromised environment. The detection specifically looks for EventID 33205 in the application log, indicating a SQL Server event, and checks for the presence of 'object_name:xp_cmdshell' and 'statement:EXEC' in the event data, confirming the execution of this procedure.
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