Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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The following analytic detects the execution of scripts via Windows Management Instrumentation (WMI) by monitoring the process 'scrcons.exe'. This detection leverages data from Endpoint Detection and Response (EDR) agents, focusing on process creation events. WMI-based script execution is significant because adversaries often use it to perform malicious activities stealthily, such as system compromise, data exfiltration, or establishing persistence. If confirmed malicious, this activity could allow attackers to execute arbitrary code, escalate privileges, or maintain long-term access to the environment. Analysts should differentiate between legitimate administrative use and potential threats.
CVE-2025-53770 is a critical zero-day vulnerability in on-premise Microsoft SharePoint Server, actively exploited in the wild, allowing unauthenticated remote code execution (RCE) with a CVSS score of 9.8. This means attackers can execute arbitrary code on a vulnerable server without needing login credentials.
The following analytic detects the execution of the `Get-ADUser` PowerShell cmdlet with parameters indicating a search for domain accounts with Kerberos Pre-Authentication disabled. It leverages PowerShell Script Block Logging (EventCode=4104) to identify this specific activity. This behavior is significant because discovering accounts with Kerberos Pre-Authentication disabled can allow adversaries to perform offline password cracking. If confirmed malicious, this activity could lead to unauthorized access to user accounts, potentially compromising sensitive information and escalating privileges within the network.
The following analytic detects the execution of the `Get-DomainUser` or `Get-NetUser` PowerShell cmdlets with the `-SPN` parameter, indicating the use of PowerView for SPN discovery. It leverages PowerShell Script Block Logging (EventCode=4104) to identify these specific commands. This activity is significant as it suggests an attempt to enumerate domain accounts associated with Service Principal Names (SPNs), a common precursor to Kerberoasting attacks. If confirmed malicious, this could allow an attacker to identify and target accounts for credential theft, potentially leading to unauthorized access and privilege escalation within the network.
This rule detects the execution of the `Get-DomainUser` commandlet with the `-PreauthNotRequired` parameter using PowerShell Script Block Logging (EventCode=4104). This command is part of PowerView, a tool used for enumerating Windows Active Directory networks. Identifying domain accounts with Kerberos Pre-Authentication disabled is significant because adversaries can leverage this information to attempt offline password cracking (AS-REP Roasting). If confirmed malicious, this activity could lead to unauthorized access to domain accounts, potentially compromising sensitive information and escalating privileges within the network.
Detects the execution of suspicious commands commonly used for reconnaissance or networking, where the parent process command indicates it was triggered by an npm 'postinstall' script. This behavior is associated with the XORIndex loader used in the "Contagious Interview" campaign.
Detects suspicious execution of PowerShell's Invoke-WebRequest cmdlet (or its aliases like curl, iwr, wget) when the output is directed to a suspicious location. Adversaries often use this technique to download malicious tools or files into user-controlled directories like AppData, Desktop, Temp, or Public folders, or directly into the Windows directory, which are not typical locations for legitimate Invoke-WebRequest output.
Analytic detect abnormal pattern of command and scripting interpreter followed by USB mount
This rule detects the execution of common command and scripting interpreters (cmd.exe, cscript.exe, powershell.exe, pwsh.exe, powershell_ise.exe, wmic.exe, wscript.exe) when their parent process is either w3wp.exe or svchost.exe, and the command arguments contain keywords related to SharePoint. This behavior can indicate suspicious activity within a SharePoint environment, potentially related to web shell execution, privilege escalation, or data exfiltration.
Catches PowerShell processes with both Base64 decoding and network download capabilities, indicating potential remote payload execution typical of advanced ClickFix attacks.
Detects execution of files from Downloads, Temp, or AppData folders by browsers, indicating potential FileFix attacks where malicious files are downloaded and immediately executed.
Detects suspicious commands written to the RunMRU registry key. This is a characteristic of the "ClickFix" social engineering technique, where a user is tricked into copying a malicious command and executing it via the Windows Run dialog (Win+R). This technique is notably used by Lumma Stealer affiliates.
Detects PowerShell commands used by Katz Stealer to download an image file containing a steganographically hidden payload, which is then decoded and executed in memory.
Detects Windows Script Host execution of suspicious file types from browsers, often used in FileFix attacks to execute malicious VBScript or JScript files.
Detects PowerShell being executed with the '-WindowStyle Hidden' flag from a Windows Scripting Host parent process (wscript.exe or cscript.exe). This is a common technique used by malware, such as Katz Stealer, to run malicious scripts stealthily after being dropped by JavaScript.
This detection identifies attempts to disable or tamper with Microsoft Defender Antivirus using common command-line tools. This is a frequent defense evasion technique used by threat actors, including those exploiting SharePoint vulnerabilities, to operate undetected on a compromised host.
KQL Query from file: Suspicious FileFix activity
This detection looks for reverse shell string patterns on an ESXi host, which may indicate that a threat actor is attempting to establish remote control over the system. It specifically identifies patterns commonly used in bash, python, and other shell commands to initiate reverse connections.
Detects PowerShell activity associated with the Kimsuky threat actor, where system information is collected and exfiltrated to a private GitHub repository, or where other IOCs related to this campaign are observed. This technique was observed in a campaign distributing the XenoRAT malware.
This rule detects suspicious PowerShell script execution that attempts to identify installed anti-virus products using WMI or PowerShell commands. It specifically looks for PowerShell Script Block Logging (EventCode 4104) entries containing keywords like "SELECT," "WMIC," "AntiVirusProduct," or "AntiSpywareProduct." This activity is often performed by malware and APT actors to map security applications for evasion purposes, potentially leading to the disabling or bypassing of security measures.
Detects PowerShell commands using string reversal techniques and specific numeric padding, methods observed in Kimsuky's "ClickFix" campaigns to obfuscate malicious code. The rule looks for a combination of PowerShell string manipulation functions and a unique numeric string.
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