Detect Pass the Hash in Elastic Security
Adversaries may 'pass the hash' using stolen password hashes to move laterally within an environment, bypassing normal system access controls. Pass the hash (PtH) is a method of authenticating as a user without having access to the user's cleartext password. This method bypasses standard authentication steps that require a cleartext password, moving directly into the portion of the authentication that uses the password hash. When performing PtH, valid password hashes for the account being used are captured using a Credential Access technique. Captured hashes are used with PtH to authenticate as that user. Once authenticated, PtH may be used to perform actions on local or remote systems. Adversaries may also use stolen password hashes to perform 'overpass the hash,' using the NTLM hash to create a valid Kerberos ticket for further lateral movement. Threat actors including APT28, APT32, APT41, Wizard Spider, FIN13, Chimera, and Kimsuky have all operationalized PtH using tools such as Mimikatz, Cobalt Strike, Invoke-SMBExec, Impacket, and CrackMapExec.
MITRE ATT&CK
- Tactic
- Defense Evasion Lateral Movement
- Sub-technique
- T1550.002 Pass the Hash
- Canonical reference
- https://attack.mitre.org/techniques/T1550/002/
Elastic Detection Query
any where
(
event.code == "4624" and
event.provider == "Microsoft-Windows-Security-Auditing" and
winlog.event_data.LogonType in ("3", "9") and
winlog.event_data.AuthenticationPackageName : "NTLM" and
not winlog.event_data.TargetUserName : ("*$", "ANONYMOUS LOGON", "IUSR", "DWM-*", "UMFD-*", "LOCAL SERVICE", "NETWORK SERVICE", "Window Manager", "Font Driver Host") and
winlog.event_data.IpAddress != null and
not winlog.event_data.IpAddress in ("-", "::1", "127.0.0.1", "")
) or (
event.code == "10" and
event.provider == "Microsoft-Windows-Sysmon" and
winlog.event_data.TargetImage : "*\\lsass.exe" and
winlog.event_data.GrantedAccess in ("0x1010", "0x1438", "0x143a", "0x40", "0x1fffff") and
not winlog.event_data.SourceImage : (
"*\\MsMpEng.exe", "*\\Taskmgr.exe", "*\\procexp.exe", "*\\procexp64.exe",
"*\\WmiPrvSE.exe", "*\\svchost.exe", "*\\csrss.exe", "*\\wininit.exe",
"*\\SecurityHealthService.exe", "*\\perfmon.exe", "*\\lsm.exe"
)
) Detects Pass the Hash (T1550.002) via two branches: (1) Windows Security Event 4624 with NTLM authentication and LogonType 3 (classic PtH lateral movement) or LogonType 9 (Mimikatz sekurlsa::pth /netonly spawning a process with injected credentials on the source host), filtering service accounts and loopback addresses; (2) Sysmon Event 10 capturing suspicious LSASS process access with known credential-dumping access masks (0x1010, 0x1438, 0x143a, 0x40, 0x1fffff), excluding legitimate system and security tooling, representing the credential harvesting step that precedes a PtH attack.
Data Sources
Required Tables
False Positives & Tuning
- Legacy enterprise applications (e.g., older ERP or print management software) that force NTLM authentication over the network and generate Type 3 logons from service accounts — tune by excluding the specific source IPs or well-known service account names after baselining.
- Administrators using 'runas /netonly' with domain credentials on a non-domain-joined workstation to access network resources generate LogonType 9 with NTLM; these are operationally legitimate but indistinguishable from Mimikatz pth /netonly without additional process ancestry context.
- Endpoint security products, crash dump tooling (WER), and custom monitoring agents that legitimately open LSASS with broad access masks will trigger the LSASS branch — build and maintain an approved-binary allowlist by SHA256 hash in addition to filename exclusions, as filenames can be spoofed.
Other platforms for T1550.002
Testing Methodology
Validate this detection against 4 adversary techniques from Atomic Red Team. Each test below lists the behaviour to exercise and the telemetry you should expect to see. Executable commands and cleanup steps are available with Pro.
- Test 1Mimikatz sekurlsa::pth Hash Injection
Expected signal: Sysmon Event ID 10: mimikatz.exe accessing lsass.exe with GrantedAccess 0x1438. Sysmon Event ID 1: cmd.exe spawned with ParentImage=mimikatz.exe, showing abnormal parent-child relationship. Security Event ID 4624 on the local machine with LogonType=9 (NewCredentials) and AuthenticationPackageName=NTLM when the injected cmd.exe makes its first outbound connection. Security Event ID 4624 on any target system accessed from the injected session shows LogonType=3 with NTLM.
- Test 2Invoke-SMBExec Pass the Hash Lateral Movement
Expected signal: Security Event ID 4624 on target (192.168.1.10): LogonType=3, AuthenticationPackageName=NTLM — primary PtH authentication event. Sysmon Event ID 3 on source: outbound TCP connection to 192.168.1.10:445. Security Event ID 7045 on target: new service installed with random 7-character name and ImagePath pointing to cmd.exe. Sysmon Event ID 1 on target: cmd.exe spawned by the transient service process.
- Test 3Impacket psexec.py Pass the Hash from Linux
Expected signal: Security Event ID 4624 on Windows target: LogonType=3, AuthenticationPackageName=NTLM, IpAddress=<Linux attacker IP> — source IP being non-Windows is a high-fidelity indicator. Security Event ID 7045: new service named 'PSEXESVC' or randomly named service installed on target. Sysmon Event ID 1 on target: cmd.exe spawned by the installed Impacket service. Network captures show SMB NTLM authentication with challenge-response originating from a Linux host.
- Test 4CrackMapExec Pass the Hash Subnet Sweep
Expected signal: Multiple Security Event ID 4624 (LogonType=3, AuthenticationPackageName=NTLM) on each host in the subnet that responds — all originating from the same attacker source IP in rapid succession. Security Event ID 4625 (failed logon, LogonType=3, NTLM) on hosts where the hash is invalid. High volume of authentication events from a single source IP in a short window creates a clear spike in the SecurityEvent table.
References (11)
- https://attack.mitre.org/techniques/T1550/002/
- https://stealthbits.com/blog/how-to-detect-overpass-the-hash-attacks/
- https://learn.microsoft.com/en-us/windows-server/security/kerberos/ntlm-overview
- https://learn.microsoft.com/en-us/windows/security/threat-protection/security-policy-settings/network-security-restrict-ntlm-ntlm-authentication-in-this-domain
- https://learn.microsoft.com/en-us/windows-server/security/credentials-protection-and-management/protected-users-security-group
- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1550.002/T1550.002.md
- https://www.mandiant.com/resources/blog/fin13-a-cybercriminal-threat-actor-focused-on-mexico
- https://www.mandiant.com/resources/reports/apt1-exposing-one-of-chinas-cyber-espionage-units
- https://www.cisa.gov/news-events/cybersecurity-advisories/aa20-301a
- https://github.com/SecureAuthCorp/impacket
- https://github.com/Kevin-Robertson/Invoke-TheHash
Unlock Pro Content
Get the full detection package for T1550.002 including response playbook, investigation guide, and atomic red team tests.