Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Detects a volumetric spike in RPC connection attempts (specifically port 135 followed by Netlogon binding) from a single host to a Domain Controller. This behavior is indicative of the exploit retry mechanism used by Zerologon (CVE-2020-1472) tools, which must attempt the authentication sequence thousands of times due to the low success probability of the all-zero byte ClientCredential.
Detects potential exploitation attempts of the Zerologon vulnerability (CVE-2020-1472) by monitoring for Domain Controller machine account password resets (Event 4742) targeting DC computer accounts, and insecure Netlogon RPC channel events (Event 5829) triggered when vulnerable clients or tools attempt connections.
This rule detects unauthorized or unauthenticated attempts to call the NetrServerPasswordSet2 method on a Domain Controller via the MS-NRPC (Netlogon) interface, which is indicative of an exploitation attempt related to CVE-2020-1472 (Zerologon). This vulnerability allows an attacker to bypass authentication and reset a Domain Controller's computer account password, leading to full domain compromise.
Detects signs of Zerologon (CVE-2020-1472) exploitation by correlating Netlogon (MS-NRPC) authentication anomalies involving known exploitation tools/process names with subsequent machine-account password reset events (Event ID 4742) occurring on the same device within a short time window.
Detects potential exploitation of the Zerologon vulnerability (CVE-2020-1472) by correlating computer account password changes (Event ID 4742) with preceding anonymous or null SID logons (Event ID 4624) where the host identifier aligns. The rule identifies anomalous account modifications that occur within a short time window following an anonymous authentication request on the same host.
Detects potential exploitation of the Zerologon vulnerability (CVE-2020-1472) by correlating computer account password changes (Event ID 4742) with preceding anonymous or null SID logons (Event ID 4624) where the host identifier aligns. The rule identifies anomalous account modifications that occur within a short time window following an anonymous authentication request on the same host.
Detects Zerologon CVE-2020-1472 exploitation against domain controllers
Detects exploitation attempts of the Zerologon (CVE-2020-1472) vulnerability using Impacket tools. The rule monitors for unauthorized machine account password resets via Netlogon, execution of common exploitation scripts like zerologon_tester.py or secretsdump.py, and suspicious NTLM anonymous authentication patterns often associated with the exploit.
Detects potential exploitation of the Zerologon vulnerability (CVE-2020-1472) by identifying a high volume of Netlogon authentication requests followed by a successful login by a Domain Admin, indicating a machine account password reset attack.
Detects Zerologon exploitation attempts against domain controllers by monitoring for anomalous machine account password resets, execution of known exploitation tooling (e.g., zerologon_tester, secretsdump), and patterns of rapid Netlogon zero-credential authentication failures.
Detects exploitation attempts of the Zerologon vulnerability (CVE-2020-1472) by monitoring for specific process executions related to Impacket tools (secretsdump, zerologon_tester), suspicious domain controller machine account password resets via Windows Event ID 4742, and high-frequency Netlogon authentication failures (Event ID 4776) typical of the zero-length client challenge brute force attack.
Detects execution of tools and scripts known for exploiting the Zerologon (CVE-2020-1472) vulnerability, including zerologon_tester.py, zerologon.py, and Impacket-based Netlogon authentication abuse. The rule monitors command-line activity for these indicators, excluding processes signed by Microsoft.
Detects that a vulnerable Netlogon secure channel connection was allowed, which could be an indicator of CVE-2020-1472.
Detects that a vulnerable Netlogon secure channel connection was allowed, which could be an indicator of CVE-2020-1472, also known as Zerologon. This vulnerability allows an unauthenticated attacker to gain domain administrator privileges.
The following analytic detects changes to computer accounts using an anonymous logon. It leverages Windows Security Event Codes 4742 (Computer Change) and 4624 (Successful Logon) with the TargetUserName set to "ANONYMOUS LOGON" and LogonType 3. This activity is significant because anonymous logons should not typically be modifying computer accounts, indicating potential unauthorized access or misconfiguration. If confirmed malicious, this could allow an attacker to alter computer accounts, potentially leading to privilege escalation or persistent access within the network.
The following analytic detects attempts to exploit the Zerologon CVE-2020-1472 vulnerability via Zeek RPC. It leverages Zeek DCE-RPC data to identify specific operations: NetrServerPasswordSet2, NetrServerReqChallenge, and NetrServerAuthenticate3. This activity is significant because it indicates an attempt to gain unauthorized access to a domain controller, potentially leading to a complete takeover of an organization's IT infrastructure. If confirmed malicious, the impact could be severe, including data theft, ransomware deployment, or other devastating outcomes. Immediate investigation of the identified IP addresses and RPC operations is crucial.
This rule detects the execution of known Proof-of-Concept (PoC) executables for the ZeroLogon vulnerability (CVE-2020-1472). It specifically looks for `cmd.exe` spawning executables named `cool.exe` or `zero.exe` with command-line arguments indicating administrative context and execution flags. Additionally, it identifies subsequent actions such as `taskkill` commands or `powershell` execution, which are common post-exploitation activities after successful ZeroLogon exploitation.
Detects potential exploitation attempts of the Netlogon Elevation of Privilege Vulnerability (CVE-2020-1472), also known as Zerologon. This rule specifically looks for Event ID 4742 (A computer account was changed) where the SubjectUserName is 'ANONYMOUS LOGON' and the TargetUserName matches a Domain Controller's machine account name (ending with '$'), while filtering out legitimate password changes by checking if 'PasswordLastSet' is not '-'.
This rule detects attempts to exploit the Zerologon vulnerability (CVE-2020-1472) using tools like Mimikatz or other exploits originating from a machine with 'kali' in its hostname. It specifically looks for Windows System event IDs 5805 or 5723 in conjunction with the keywords 'kali' or 'mimikatz'.
This rule is designed to detect attempts to exploit Zerologon (CVE-2020-1472) vulnerability using mimikatz zerologon module or other exploits from machine with "kali" hostname.