Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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This rule looks for the usage of less common PowerShell modules which interface directly with the current user's clipboard. This could be an attempt to steal sensitive data or attempt to modify clipboard contents.
The following analytic detects the usage of specific Exchange PowerShell modules, such as New-MailboxExportRequest, New-ManagementRoleAssignment, New-MailboxSearch, and Get-Recipient. It leverages PowerShell Script Block Logging (EventCode 4104) to identify these commands. This activity is significant because these modules can be exploited by adversaries who have gained access via ProxyShell or ProxyNotShell vulnerabilities. If confirmed malicious, attackers could export mailbox contents, assign management roles, conduct mailbox searches, or view recipient objects, potentially leading to data exfiltration, privilege escalation, or unauthorized access to sensitive information.
This rule detects suspicious PowerShell command patterns associated with the Chaos ransomware group. These commands are used for environment setup, preparing for large file downloads, and remote command execution.
The following analytic detects potential malicious activities involving PowerShell's task scheduling cmdlets. It leverages PowerShell Script Block Logging (EventCode 4104) to identify unusual or suspicious use of cmdlets like 'New-ScheduledTask' and 'Set-ScheduledTask'. This activity is significant as attackers often use these cmdlets for persistence and remote execution of malicious code. If confirmed malicious, this could allow attackers to maintain access, deliver additional payloads, or execute ransomware, leading to data theft or other severe impacts. Immediate investigation and mitigation are crucial to prevent further compromise.
The following analytic identifies suspicious Cmdlet usage in Exchange Management logs, focusing on commands like New-MailboxExportRequest and New-ManagementRoleAssignment. It leverages EventCode 1 and specific Message patterns to detect potential ProxyShell and ProxyNotShell abuse. This activity is significant as it may indicate unauthorized access or manipulation of mailboxes and roles, which are critical for maintaining email security. If confirmed malicious, attackers could export mailbox data, assign new roles, or search mailboxes, leading to data breaches and privilege escalation.
The following analytic detects suspicious PowerShell activity via EventCode 4104, where WMI performs event queries to gather information on running processes or services. This detection leverages PowerShell Script Block Logging to identify specific WMI queries targeting system information classes like Win32_Bios and Win32_OperatingSystem. This activity is significant as it often indicates reconnaissance efforts by an adversary to profile the compromised machine. If confirmed malicious, the attacker could gain detailed system information, aiding in further exploitation or lateral movement within the network.
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.
This rule detects the presence of a plain text artifact in a common download scenario in PowerShell where the second required portion of the command is not present. This could be an attempt to obfuscate the script in order to evade detections.
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 PowerShell commands used for domain enumeration, such as `get-netdomaintrust` and `get-adgroupmember`. It leverages PowerShell Script Block Logging (EventCode=4104) to capture and analyze the full command sent to PowerShell. This activity is significant as it often indicates reconnaissance efforts by an attacker to map out the domain structure and identify key users and groups. If confirmed malicious, this behavior could lead to further targeted attacks, privilege escalation, and unauthorized access to sensitive information within the domain.
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 PowerShell scripts leveraging the "Invoke-WebRequest" or "Invoke-RestMethod" cmdlets to send data using either the "PUT" or "POST" HTTP method. This behavior can indicate an attempt to exfiltrate data from the system.
Detects PowerShell execution using Invoke-WebRequest (or its aliases like curl, wget, Invoke-RestMethod, irm, iwr) to connect to an IP address directly. This behavior can be indicative of malware downloading additional stages or establishing command and control, especially when avoiding DNS resolution.
This rule detects PowerShell scripts that utilize web request cmdlets (Invoke-WebRequest, Invoke-RestMethod, irm, iwr) along with the '-UserAgent' parameter. Adversaries often modify user agents to mimic legitimate traffic or specific applications, blending in with normal network activity to evade detection while communicating with command and control servers or exfiltrating data.
Detects the use of PowerShell to execute the 'Set-MpPreference' cmdlet to configure Windows Defender's threat severity default action to 'Allow' (value '6') or 'NoAction' (value '9'). This is a highly suspicious configuration change that effectively disables Defender's ability to automatically mitigate threats of a certain severity level. An attacker might use this technique via the command line to bypass defenses before executing payloads.
Detects potential DLL files being downloaded using the PowerShell Invoke-WebRequest or Invoke-RestMethod cmdlets. This activity is often associated with adversaries transferring malicious tools or components into a compromised environment.
Analytic detect abnormal pattern of command and scripting interpreter followed by USB mount
The SID S-1-5-32-544 refers to the builtin "Administrators" group on a local Windows machine. Threat actors will often reference this SID rather than the group name in order to obfuscate their actions. References to the SID rather than the group name should be considered unusual.
Catches PowerShell processes with both Base64 decoding and network download capabilities, indicating potential remote payload execution typical of advanced ClickFix attacks.
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.
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