CrowdStrike

This analytic detects the execution of tools commonly used by attackers for activities such as unauthorized access, network scanning, privilege escalation, password dumping, or data exfiltration, leveraging process activity data from Endpoint Detection and Response (EDR) agents to identify known attacker tool names.

This brief outlines a detection strategy for identifying modifications to Windows registry keys commonly used for persistence, including Run, Winlogon, and Image File Execution Options, enabling detection engineers to alert on unauthorized system startup entries for malicious code execution to prevent persistent access.

This content introduces AI Detection and Response (AIDR) as a new cybersecurity category to address emerging threats from autonomous AI agents, including supply chain attacks and unintended data sharing, highlighting their ability to execute with inherited privileges across endpoints, SaaS, and cloud environments.

CrowdStrike highlights a critical identity management gap in AI agent deployments where current OAuth 2.1 tokens and JWT (RFC 9068) lack standardized mechanisms to represent an AI agent's instance identity, the user on whose behalf it acts, and their relationship, hindering fine-grained access controls, audit trails, and detection of out-of-scope actions.

The rule identifies command-line executions that attempt to access cloud service provider's Instance Metadata Service (IMDS) API endpoints, potentially retrieving sensitive instance information and temporary security credentials, ultimately leading to credential access and privilege escalation within the cloud environment.

This rule identifies rare connection attempts to a Web Distributed Authoring and Versioning (WebDAV) resource, where attackers may inject WebDAV paths in files or features opened by a victim user to leak their NTLM credentials via forced authentication using rundll32.exe.

This rule detects passwordless sudo probing activity on Linux systems, which can indicate an attacker attempting to enumerate allowed commands and potential privilege escalation.

Identifies the creation of a Windows service by an unusual client process, which can be leveraged to escalate privileges from administrator to SYSTEM by exploiting misconfigurations or vulnerabilities in the service creation process.

Detects attempts to bypass User Account Control (UAC) by masquerading as a trusted Microsoft Windows directory, abusing a trailing-space in the path to execute code with elevated privileges.

Detects User Account Control (UAC) bypass attempts using eventvwr.exe to execute code with elevated permissions by identifying child processes of eventvwr.exe, excluding mmc.exe and WerFault.exe, which may indicate unauthorized privilege escalation.

A privilege escalation attempt is detected through modification of the Windows directory (Windir) environment variable, a technique often combined with other vulnerabilities to elevate privileges by redirecting system processes.

Adversaries may escalate privileges by abusing named pipe impersonation, a technique often used with tools like Metasploit's meterpreter getsystem command, where a process writes to a named pipe to facilitate a SYSTEM-token handoff.

The rule detects the hijack of the Microsoft Compatibility Appraiser scheduled task to establish persistence with system integrity level, by monitoring CompatTelRunner.exe process execution and detecting unexpected child processes.

This rule detects a persistence mechanism that utilizes the NtSetValueKey native API to create a hidden (null terminated) registry key, evading detection from system utilities.

Detection of suspicious ImagePath values written to the registry, indicating potential persistence or privilege escalation via abnormal service creation involving command interpreters or named pipes.

This rule detects attempts to establish persistence on Windows endpoints by abusing Microsoft Office add-ins through the creation of malicious files in Office startup directories.

Detects suspicious modifications to the Windows Startup shell folder, a technique used to bypass detections monitoring file creation in the Windows Startup folder.

Detects the creation of a hidden local user account by appending a dollar sign ($) to the account name, a technique used by attackers to persist on a system and evade standard account listing methods.

The rule detects execution of processes from the Remote Desktop Protocol (RDP) shared mountpoint tsclient on Windows hosts, which may indicate a lateral movement attempt.

The rule detects the use of wmic.exe for shadow copy deletion on Windows endpoints, a common tactic used in ransomware or other destructive attacks to inhibit system recovery.

Adversaries may abuse Curl for Windows to download files or upload data to a remote URL for command and control or exfiltration purposes.

Adversaries may abuse Cloudflare Tunnel (cloudflared) on Windows systems to proxy command and control traffic or exfiltrate data through Cloudflare's edge, evading direct connection blocking.

An adversary may abuse port forwarding to bypass network segmentation restrictions by creating a new port forwarding rule through modification of the Windows registry.

A suspicious Zoom child process was detected, indicating a potential attempt to run unnoticed by masquerading as Zoom.exe or exploiting a vulnerability, resulting in the execution of cmd.exe, powershell.exe, pwsh.exe, or powershell_ise.exe.

This rule identifies the execution of PowerShell with suspicious argument values, often observed during malware installation, by detecting unusual PowerShell arguments indicative of abuse, focusing on patterns like encoded commands, suspicious downloads, and obfuscation techniques.

Adversaries can abuse the Windows command line debugging utility cdb.exe to execute commands or shellcode from non-standard paths, evading traditional security measures.

This rule detects modifications to the registered Subject Interface Package (SIP) providers, which are used by the Windows cryptographic system to validate file signatures, potentially indicating an attempt to bypass signature validation or inject code for defense evasion.

Detection of service DACL modifications via `sc.exe` using the `sdset` command, potentially leading to defense evasion by denying service access to legitimate users or system accounts.

Adversaries may abuse RDP files delivered via phishing from suspicious locations to gain unauthorized access to systems.

This rule detects file name patterns generated by the use of Sysinternals SDelete utility, potentially used by attackers to delete forensic indicators and hinder data recovery efforts.

This brief details a registry modification attack that downgrades the system to NTLMv1 authentication, enabling NetNTLMv1 downgrade attacks, typically performed with local administrator privileges on Windows systems.

Adversaries may add malicious Windows Filtering Platform (WFP) rules to prevent endpoint security solutions from sending telemetry data, impairing defenses, which this rule detects by identifying multiple WFP block events where the process name is associated with endpoint security software.

Adversaries may modify the LocalAccountTokenFilterPolicy registry key to bypass User Account Control (UAC) and gain elevated privileges remotely by granting high-integrity tokens to remote connections from local administrators, facilitating lateral movement and defense evasion.

Adversaries may use the `dsquery.exe` command-line utility to enumerate trust relationships for lateral movement in Windows multi-domain environments.

Attackers may attempt to disable or modify code signing policies on Windows systems by using built-in tools like bcdedit.exe in order to execute unsigned or self-signed malicious code.

The rule detects a potential chroot container escape via mount, which involves a user within a container mounting the host's root file system and using chroot to escape the containerized environment, indicating a privilege escalation attempt.

Detects suspicious DNS queries containing a base64-encoded blob, indicating potential Kerberos coercion attacks and SPN spoofing via DNS to coerce authentication to attacker-controlled hosts, enabling Kerberos or NTLM relay attacks.

This rule detects the execution of PowerShell, PowerShell ISE, or Cmd spawned from Windows Script Host or MSHTA, indicating potential abuse of scripting interpreters to execute malicious commands or scripts on Windows systems.

This rule identifies the execution of the Windows Command Shell process (cmd.exe) with suspicious argument values, often observed during malware installation.

Attackers with Backup Operator privileges may abuse wbadmin.exe to access the NTDS.dit file, enabling credential dumping and domain compromise.

Adversaries may use Microsoft Management Console (MMC) files from untrusted paths to bypass security controls for initial access and execution on Windows systems.

Attackers with DNSAdmin privileges can modify or disable the DNS Global Query Block List (GQBL) in Windows, allowing exploitation of hosts running WPAD with default settings for privilege escalation and lateral movement.

Adversaries use the Windows built-in utility Netsh to dump Wireless saved access keys in clear text, potentially leading to credential compromise.

Adversaries may clear the command history of a compromised account to conceal the actions undertaken during an intrusion on a Windows system.

Attackers may abuse the Netsh Helper DLL functionality by adding malicious DLLs to execute payloads every time the netsh utility is executed via administrators or scheduled tasks, achieving persistence.

Adversaries may use vaultcmd.exe to list credentials stored in the Windows Credential Manager to gain unauthorized access to saved usernames and passwords, potentially in preparation for lateral movement.

This rule detects suspicious managed code hosting processes on Windows systems, potentially indicating code injection or defense evasion tactics by monitoring file events associated with processes commonly used to host managed code, such as wscript.exe, cscript.exe, and mshta.exe.

Adversaries may masquerade malicious executables within directories mimicking the legitimate Windows Program Files directory to evade defenses and execute untrusted code.

This rule detects attempts to install a file from a remote server using MsiExec, which adversaries may abuse to deliver malware, by identifying msiexec.exe processes running with arguments indicative of remote installations and executed from suspicious parent processes.

This rule detects potential exploitation of unquoted service path vulnerabilities, where adversaries may escalate privileges by placing a malicious executable in a higher-level directory within the path of an unquoted service executable.

Adversaries modify the AmsiEnable registry key to 0 to disable Windows Script AMSI scanning, bypassing AMSI protections for Windows Script Host or JScript execution.

The rule identifies unexpected executable file creation or modification by critical Windows processes, potentially indicating remote code execution or exploitation attempts.

This rule identifies attempts to execute Jscript/Vbscript files from an archive file, a common delivery method for malicious scripts on Windows systems.

Detects attempts to export sensitive Windows registry hives (SAM/SECURITY) using reg.exe, potentially leading to credential compromise.

This rule detects the abuse of Windows Sandbox with sensitive configurations to evade detection, where malware may abuse the sandbox feature to gain write access to the host file system, enable network connections, and automatically execute commands via logon, identifying the start of a new container with these sensitive configurations.

Adversaries may coerce local NTLM authentication over HTTP via WebDAV named-pipe paths (Print Spooler, SRVSVC), then relay credentials to elevate privileges.

Attackers abuse the Application Compatibility Shim functionality in Windows to establish persistence and achieve arbitrary code execution by installing malicious shim databases, which this detection identifies through monitoring registry changes.

Detection of PowerShell execution initiated via Crowdstrike Real Time Response (RTR) 'runscript' command, potentially indicating malicious actors leveraging compromised Crowdstrike Dashboard access to execute commands on remote hosts using encoded commands.

Attackers attempt to disable Windows Event and Security Logs using logman, PowerShell, or auditpol to evade detection and cover their tracks.

This rule detects potential fake CAPTCHA phishing attacks on Windows systems where victims are tricked into copying and pasting malicious commands into the Windows Run dialog box.

Detects execution of JavaScript via Deno with suspicious command-line patterns (base64, eval, http, or import in a JavaScript context), which adversaries may abuse to run malicious JavaScript for execution or staging.

Adversaries may execute the `net.exe` or `wmic.exe` commands to enumerate administrator accounts or groups, both locally and within the domain, to gather information for follow-on actions.

This rule detects the creation of the default Mimikatz MemSSP credential log file, mimilsa.log, which is created after the misc::memssp module injects a malicious Security Support Provider into LSASS, potentially capturing credentials from subsequent logons.

This rule detects registry modifications indicative of a new Windows Subsystem for Linux (WSL) distribution installation, a technique adversaries may leverage to evade detection by utilizing Linux environments within Windows.

This rule identifies the use of bcdedit.exe to modify boot configuration data, which may be indicative of a destructive attack or ransomware activity aimed at inhibiting system recovery by disabling error recovery or ignoring boot failures.

Detects suspicious command execution via WMI on a Windows host, potentially indicating lateral movement by an adversary using cmd.exe to execute commands remotely.

This rule detects attempts to execute content from remote WebDAV shares, where attackers may abuse WebDAV paths, public tunnels, or host@port UNC paths to execute tools or scripts, reducing local staging on the victim's file system.

An adversary may attempt to bypass AMSI by creating a rogue AMSI DLL in an unusual location to evade detection.

Detects the execution of scripts via HTML applications using Windows utilities rundll32.exe or mshta.exe to bypass defenses by proxying execution of malicious content with signed binaries.

Adversaries abuse the Console Window Host (conhost.exe) with the `--headless` argument to proxy execution of malicious commands, evading detection by blending in with legitimate Windows software.

Detection of adversaries disabling Windows Firewall rules using the `netsh.exe` command-line tool to weaken defenses and facilitate unauthorized network activity.

This rule identifies attempts to create new users on Windows systems using net.exe, a common tactic used by attackers to increase access or establish persistence.

Adversaries may enable and use Windows Subsystem for Linux (WSL) using the Microsoft Dism utility to evade detection on Windows systems by running Linux applications and tools.

Attackers can enable host network discovery via netsh.exe to weaken host firewall settings, facilitating lateral movement by identifying other systems on the network.

Attackers may disable the Windows firewall or its rules using the `Set-NetFirewallProfile` PowerShell cmdlet to enable lateral movement and command and control activity.

Adversaries may attempt to bypass Windows Defender's capabilities by using PowerShell to add exclusions for folders or processes, and this activity can be detected by monitoring PowerShell command lines that use `Add-MpPreference` or `Set-MpPreference` with exclusion parameters.

Attackers may establish persistence by modifying the ReflectDebugger registry key associated with Windows Error Reporting to execute arbitrary code when Werfault is invoked with the '-pr' parameter.

Adversaries may modify the Windows Security Support Provider (SSP) configuration in the registry to establish persistence or evade defenses.

Detects suspicious execution of the Microsoft Antimalware Service Executable (MsMpEng.exe) from non-standard paths or renamed instances, which may indicate an attempt to evade defenses through DLL side-loading or masquerading.

This rule detects suspicious Node.js execution patterns on Windows systems, including user-writable runtimes, preload arguments, and inline eval, decode, or child-process usage, indicating potential malicious activity.

A SolarWinds binary is modifying the start type of a service to be disabled via registry modification, potentially to disable or impair security services.

Attackers can abuse Windows Work Folders to execute a masqueraded control.exe file from untrusted locations, potentially bypassing application controls for defense evasion and privilege escalation.

This rule detects the execution of renamed utilities with a single-character process name, differing from the original filename, a common technique used by adversaries for staging, executing temporary utilities, or bypassing security detections.

The desktopimgdownldr utility can be abused to download remote files, potentially bypassing standard download restrictions and acting as an alternative to certutil for malware or tool deployment.

This rule detects remote file copy attempts to hidden network shares, which may indicate lateral movement or data staging activity, by identifying suspicious file copy operations using command-line tools like cmd.exe and powershell.exe focused on hidden share patterns.

Modification of the AppInit DLLs registry keys on Windows systems allows attackers to execute code in every process that loads user32.dll, establishing persistence and potentially escalating privileges.

An adversary may enable Remote Desktop Protocol (RDP) access by modifying the `fDenyTSConnections` registry key, potentially indicating lateral movement preparation or defense evasion.

Attackers modify the NullSessionPipe registry setting in Windows to enable anonymous access to named pipes, potentially facilitating lateral movement and unauthorized access to network resources.

The rule detects the use of the Exchange PowerShell cmdlet, Set-CASMailbox, to add a new ActiveSync allowed device, potentially allowing attackers to gain persistent access to sensitive email data by adding unauthorized devices.

Adversaries may disable or tamper with Microsoft Defender features via registry modifications to evade detection and conceal malicious behavior on Windows systems.

This detection identifies attempts to execute programs from the Windows Subsystem for Linux (WSL) to evade detection by flagging suspicious executions initiated by WSL processes and excluding known safe executables.

This rule detects the creation, modification, or deletion of DLL files within Windows SxS local folders, which could indicate an attempt to execute malicious payloads by abusing shared module loading.

Adversaries may use the New-MailboxExportRequest PowerShell cmdlet to export mailboxes in Exchange, potentially leading to sensitive information theft.

This rule detects registry write modifications hiding encoded portable executables, indicative of adversary defense evasion by avoiding storing malicious content directly on disk.

Adversaries may modify the RunAsPPL registry key to disable LSA protection, which prevents nonprotected processes from reading memory and injecting code, potentially leading to credential access.

This detection identifies delete events on CrowdStrike registry keys, which typically occur during agent uninstallation, so any unplanned or unexpected removal of these keys should be investigated for malicious activity such as defense evasion or exploits like CVE-2022-44721.

Adversaries may use the Windows forfiles utility to proxy command execution via a trusted parent process, potentially evading detection.

Detects the execution of ADExplorer, a tool used for Active Directory viewing and editing, which can be abused by adversaries for domain reconnaissance and creating offline snapshots of the AD database.

Detects the creation of .kirbi files, a suspicious Kerberos ticket artifact often produced by ticket export or dumping tools such as Rubeus or Mimikatz, indicating preparation for Kerberos ticket theft or Pass-The-Ticket (PTT) attacks.

Adversaries can use attrib.exe to add the 'hidden' attribute to files to hide them from users and evade detection, which can be detected by monitoring process executions related to attrib.exe.

Adversaries may use the Windows file system utility, fsutil.exe, with the fsinfo drives command to enumerate attached peripheral devices and gain information about a compromised system.

Mshta.exe spawning a suspicious child process, such as cmd.exe or powershell.exe, indicates potential adversarial activity leveraging Mshta to execute malicious scripts and evade detection on Windows systems.

Adversaries may use unusual parent processes to execute .NET compilers for compiling malicious code after delivery, evading security mechanisms, and this activity is detected by monitoring compiler executions initiated by scripting engines or system utilities.

Adversaries may use the `netsh.exe` utility to enable inbound Remote Desktop Protocol (RDP) connections in the Windows Firewall, potentially allowing unauthorized remote access to compromised systems.

Adversaries may leverage the `net.exe` utility to mount WebDav or hidden remote shares, potentially indicating lateral movement, data exfiltration preparation, or initial access via discovery of accessible shares.

Attackers may disable User Account Control (UAC) by modifying specific registry values, allowing them to execute code with elevated privileges, bypass security restrictions, and potentially escalate privileges on Windows systems.

Adversaries may attempt to install or use Kali Linux via Windows Subsystem for Linux (WSL) to avoid detection, potentially enabling them to perform malicious activities within a Windows environment while blending in with legitimate WSL usage.

Adversaries may execute malicious code from Alternate Data Streams (ADS) on Windows to evade defenses by hiding malware within legitimate files, which this detection identifies by monitoring process execution paths and arguments.

Detection of creation or modification of Domain Backup private keys, which adversaries may extract from a Domain Controller (DC) to decrypt domain user master key files.

Detects copy operations of Active Directory Domain Database (ntds.dit) or Security Account Manager (SAM) files, potentially exposing sensitive hashed credentials on Windows systems.