Detect Use Alternate Authentication Material in Sumo Logic CSE
Adversaries may use alternate authentication material, such as password hashes, Kerberos tickets, and application access tokens, in order to move laterally within an environment and bypass normal system access controls. Authentication processes generally require a valid identity (e.g., username) along with one or more authentication factors (e.g., password, pin, physical smart card, token generator, etc.). Alternate authentication material is legitimately generated by systems after a user or application successfully authenticates by providing a valid identity and the required authentication factor(s). By stealing alternate authentication material, adversaries are able to bypass system access controls and authenticate to systems without knowing the plaintext password or any additional authentication factors. Sub-techniques include Application Access Token abuse (T1550.001), Pass the Hash (T1550.002), Pass the Ticket (T1550.003), and Web Session Cookie reuse (T1550.004).
MITRE ATT&CK
- Tactic
- Defense Evasion Lateral Movement
- Canonical reference
- https://attack.mitre.org/techniques/T1550/
Sumo Detection Query
_sourceCategory=windows/security (EventCode=4624 OR EventCode=4769 OR EventCode=4776)
| parse "Logon Type:\t*\n" as logon_type nodrop
| parse "Authentication Package:\t*\n" as auth_package nodrop
| parse "Source Network Address:\t*\n" as src_ip nodrop
| parse "Ticket Encryption Type:\t*\n" as ticket_enc nodrop
| parse "Target User Name:\t*\n" as target_user nodrop
| parse "Status:\t*\n" as event_status nodrop
| parse "Workstation Name:\t*\n" as workstation nodrop
| where !isNull(logon_type) OR !isNull(ticket_enc) OR !isNull(event_status)
| eval pth_type9 = if(EventCode="4624" AND logon_type="9", 1, 0)
| eval pth_ntlm = if(
EventCode="4624"
AND logon_type="3"
AND (toLowerCase(auth_package) = "ntlm" OR toLowerCase(auth_package) = "ntlmssp")
AND !isNull(src_ip) AND src_ip != "-" AND src_ip != ""
AND src_ip != "127.0.0.1" AND src_ip != "::1"
AND !matches(target_user, ".*\\$$"),
1, 0)
| eval ptt_rc4 = if(
EventCode="4769"
AND (ticket_enc = "0x17" OR ticket_enc = "23")
AND (event_status = "0x0" OR isNull(event_status)),
1, 0)
| eval ntlm_hashfail = if(
EventCode="4776"
AND !isNull(event_status)
AND event_status != ""
AND event_status != "0x0"
AND event_status != "0",
1, 0)
| eval suspicion_score = (pth_type9 * 3) + pth_ntlm + (ptt_rc4 * 2) + ntlm_hashfail
| where suspicion_score > 0
| eval attack_pattern = if(pth_type9=1, "Pass-the-Hash: LogonType 9 NewCredentials",
if(pth_ntlm=1, "Pass-the-Hash: NTLM Network Logon",
if(ptt_rc4=1, "Pass-the-Ticket: RC4 Kerberos Downgrade",
if(ntlm_hashfail=1, "NTLM Hash Override Attempt", "Alternate Auth Abuse"))))
| fields _messageTime, _sourceHost, target_user, EventCode, logon_type, auth_package, src_ip, ticket_enc, event_status, attack_pattern, suspicion_score
| sort by suspicion_score desc, _messageTime descDetects Use of Alternate Authentication Material (T1550) by parsing Windows Security Event logs in Sumo Logic for Pass-the-Hash indicators (LogonType 9 and remote NTLM logons via Event 4624), Pass-the-Ticket RC4 Kerberos downgrade (Event 4769), and NTLM credential validation failures (Event 4776). Assigns weighted suspicion scores for triage prioritisation.
Data Sources
Required Tables
False Positives & Tuning
- Domain-joined workstations authenticating via NTLM (LogonType 3) to file shares or print servers not Kerberos-enrolled, particularly in mixed Windows/Linux environments
- Vulnerability scanners or EDR consoles performing NTLM authentication health checks that trigger Event 4776 failures with non-zero status codes
- Service accounts with expired passwords generating repeated Event 4776 failures before administrators update cached credentials
Other platforms for T1550
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 1Pass-the-Hash via Mimikatz sekurlsa::pth (Windows)
Expected signal: Sysmon Event ID 1: Process Create for mimikatz.exe with parent process context. Security Event ID 4624 with LogonType=9, TargetUserName=testadmin, AuthenticationPackageName=NTLM on the local host — this fires immediately when the new process token is created. If the spawned cmd.exe then accesses a network resource, Security Event ID 4624 LogonType=3 with NTLM auth will appear on the target host. Sysmon Event ID 10 may appear if mimikatz accessed LSASS.
- Test 2Pass-the-Hash via Impacket wmiexec.py (Linux attacking Windows)
Expected signal: On the target Windows host: Security Event ID 4624 with LogonType=3, AuthenticationPackageName=NTLM, IpAddress=<Linux attacker IP>, TargetUserName=testadmin. Security Event ID 4688 (or Sysmon Event ID 1) showing WmiPrvSE.exe spawning cmd.exe for the WMI command execution. No LogonType 9 event — this is a pure NTLM Type 3 network logon, demonstrating the PTH_NTLM detection branch.
- Test 3Pass-the-Ticket — Export and Inject Kerberos Ticket via Mimikatz
Expected signal: Sysmon Event ID 1: Process Create for mimikatz.exe. After ticket injection, subsequent Kerberos service ticket requests from the session may appear in Security Event ID 4769 — if the injected ticket is RC4-encrypted (common with older tickets or those from tools using RC4), TicketEncryptionType=0x17 will appear. Security Event ID 4648 may appear when using the injected ticket to access network resources. klist output shows the injected service ticket.
- Test 4Overpass-the-Hash — Convert NTLM Hash to Kerberos TGT via Mimikatz /ptt
Expected signal: Security Event ID 4624 LogonType=9 on the local host when the new credential token is created. Security Event ID 4768 (Kerberos TGT request) on the domain controller showing the AS-REQ using RC4-HMAC encryption (TicketEncryptionType=0x17) if the domain does not enforce AES-only. Security Event ID 4769 when the TGT is used to request service tickets for SYSVOL/CIFS access. The combination of LogonType 9 followed by Kerberos tickets from that session ties the PTH origin to subsequent Kerberos activity.
References (13)
- https://attack.mitre.org/techniques/T1550/
- https://technet.microsoft.com/en-us/library/dn487457.aspx
- https://csrc.nist.gov/glossary/term/authentication
- https://csrc.nist.gov/glossary/term/multi_factor_authentication
- https://learn.microsoft.com/en-us/defender-endpoint/advanced-hunting-securityevent-table
- https://github.com/gentilkiwi/mimikatz/wiki/module-~-sekurlsa
- https://github.com/SecureAuthCorp/impacket
- https://www.sans.org/white-papers/36962/
- https://docs.microsoft.com/en-us/windows-server/identity/ad-ds/plan/security-best-practices/credential-protection-and-management
- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1550.002/T1550.002.md
- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1550.003/T1550.003.md
- https://adsecurity.org/?p=1515
- https://www.microsoft.com/en-us/security/blog/2021/09/27/foggyweb-targeted-nobelium-malware-leads-to-persistent-backdoor/
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