SigmaHQ Detections
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Detects the creation of ".rev" files by WinRAR, which can indicate potential exploitation of CVE-2023-40477. This vulnerability allows for arbitrary code execution. The rule looks for file creation events where the process is either 'explorer.exe' (suggesting extraction via context menu) or 'WinRAR.exe', and the created file has a '.rev' extension. Further investigation for suspicious execution or WinRAR application crashes shortly after such file creation is recommended.
Detects the execution of 'rundll32.exe' by a 'svchost.exe' process, specifically when the 'svchost.exe' is running with command-line arguments associated with the ColdSteel RAT persistence mechanism (e.g., '-k msupdate', '-k msupdate2', '-k alg'). The 'rundll32.exe' process further executes specific functions ('UpdateDriverForPlugAndPlayDevicesW', 'ServiceMain', 'DiUninstallDevice') which are indicative of the ColdSteel RAT's cleanup or operational commands. This behavior is noted to be specific to certain ColdSteel RAT samples and not present in older versions.
This rule detects the execution of 'rundll32.exe' when it is spawned by specific parent processes (cmd.exe, cscript.exe, curl.exe, mshta.exe, powershell.exe, pwsh.exe, wscript.exe) and the command line contains paths commonly used by Qakbot for persistence or execution (e.g., ProgramData, Users\Public, AppData\Local\Temp, AppData\Roaming) along with a '.dll' extension. This combination of indicators is often associated with Qakbot malware activity.
This rule detects specific filenames, 'jpsetup.exe' and 'jpinst.exe', when they appear as the target filename in file events. These filenames have been associated with the SNAKE malware, as detailed in a CISA report. The rule aims to identify potential installations or presence of this malware on Windows systems.
This rule detects the use of specific Windows API (WinAPI) libraries within PowerShell scripts. Attackers often leverage direct WinAPI calls from PowerShell to bypass typical detection mechanisms that focus on standard PowerShell function calls. The rule specifically looks for the presence of 'Advapi32.dll', 'kernel32.dll', 'KernelBase.dll', 'ntdll.dll', 'secur32.dll', and 'user32.dll' within the PowerShell script block text. This can indicate attempts to perform low-level system operations or interact with the operating system in a way that might evade higher-level monitoring.
Detects the use of 7-Zip utilities (7z.exe, 7za.exe, and 7zr.exe) to extract password-protected compressed files. This activity can be indicative of an adversary decompressing sensitive data or malware that was archived with a password, potentially as part of collection or staging activities.
Detects the use of the redirection character ">" in command-line arguments of `cmd.exe`. This technique is often used by malicious actors to redirect the output of reconnaissance commands (e.g., `hostname`, `dir`) to files for later exfiltration.
This rule detects the creation of scheduled tasks by monitoring specific registry key paths associated with the Windows Task Scheduler. Adversaries often use scheduled tasks for persistence, privilege escalation, or execution of malicious code. By observing modifications to these registry paths, the rule aims to identify when new scheduled tasks are being registered on a system.
This rule detects potential JNDI (Java Naming and Directory Interface) injection exploitation attempts within JVM-based applications. It specifically looks for keywords related to LDAP lookups ('com.sun.jndi.ldap.') and the Log4j JndiManager ('org.apache.logging.log4j.core.net.JndiManager') in application error logs. Such patterns are commonly associated with vulnerabilities like Log4Shell, where attackers inject malicious JNDI lookup strings to achieve remote code execution.
Detects suspicious Ruby on Rails exceptions that could indicate exploitation attempts. These exceptions often occur when an attacker is probing a web application for vulnerabilities or attempting to bypass security controls like CSRF tokens, or sending malformed requests.
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