Kerberos Traffic from Unusual Process

  1[metadata]
  2creation_date = "2020/11/02"
  3integration = ["endpoint", "sentinel_one_cloud_funnel"]
  4maturity = "production"
  5updated_date = "2025/03/20"
  6
  7[transform]
  8[[transform.osquery]]
  9label = "Osquery - Retrieve DNS Cache"
 10query = "SELECT * FROM dns_cache"
 11
 12[[transform.osquery]]
 13label = "Osquery - Retrieve All Services"
 14query = "SELECT description, display_name, name, path, pid, service_type, start_type, status, user_account FROM services"
 15
 16[[transform.osquery]]
 17label = "Osquery - Retrieve Services Running on User Accounts"
 18query = """
 19SELECT description, display_name, name, path, pid, service_type, start_type, status, user_account FROM services WHERE
 20NOT (user_account LIKE '%LocalSystem' OR user_account LIKE '%LocalService' OR user_account LIKE '%NetworkService' OR
 21user_account == null)
 22"""
 23
 24[[transform.osquery]]
 25label = "Osquery - Retrieve Service Unsigned Executables with Virustotal Link"
 26query = """
 27SELECT concat('https://www.virustotal.com/gui/file/', sha1) AS VtLink, name, description, start_type, status, pid,
 28services.path FROM services JOIN authenticode ON services.path = authenticode.path OR services.module_path =
 29authenticode.path JOIN hash ON services.path = hash.path WHERE authenticode.result != 'trusted'
 30"""
 31
 32
 33[rule]
 34author = ["Elastic"]
 35description = """
 36Identifies network connections to the standard Kerberos port from an unusual process. On Windows, the only process that
 37normally performs Kerberos traffic from a domain joined host is lsass.exe.
 38"""
 39false_positives = [
 40    """
 41    HTTP traffic on a non standard port. Verify that the destination IP address is not related to a Domain Controller.
 42    """,
 43]
 44from = "now-9m"
 45index = ["logs-endpoint.events.network-*", "logs-sentinel_one_cloud_funnel.*"]
 46language = "eql"
 47license = "Elastic License v2"
 48name = "Kerberos Traffic from Unusual Process"
 49note = """## Triage and analysis
 50
 51### Investigating Kerberos Traffic from Unusual Process
 52
 53Kerberos is the default authentication protocol in Active Directory, designed to provide strong authentication for client/server applications by using secret-key cryptography.
 54
 55Domain-joined hosts usually perform Kerberos traffic using the `lsass.exe` process. This rule detects the occurrence of traffic on the Kerberos port (88) by processes other than `lsass.exe` to detect the unusual request and usage of Kerberos tickets.
 56
 57> **Note**:
 58> This investigation guide uses the [Osquery Markdown Plugin](https://www.elastic.co/guide/en/security/current/invest-guide-run-osquery.html) introduced in Elastic Stack version 8.5.0. Older Elastic Stack versions will display unrendered Markdown in this guide.
 59
 60#### Possible investigation steps
 61
 62- Investigate the process execution chain (parent process tree) for unknown processes. Examine their executable files for prevalence, whether they are located in expected locations, and if they are signed with valid digital signatures.
 63- Investigate other alerts associated with the user/host during the past 48 hours.
 64- Check if the Destination IP is related to a Domain Controller.
 65- Review event ID 4769 for suspicious ticket requests.
 66- Examine the host for derived artifacts that indicate suspicious activities:
 67  - Analyze the process executable using a private sandboxed analysis system.
 68  - Observe and collect information about the following activities in both the sandbox and the alert subject host:
 69    - Attempts to contact external domains and addresses.
 70      - Use the Elastic Defend network events to determine domains and addresses contacted by the subject process by filtering by the process' `process.entity_id`.
 71      - Examine the DNS cache for suspicious or anomalous entries.
 72        - $osquery_0
 73    - Use the Elastic Defend registry events to examine registry keys accessed, modified, or created by the related processes in the process tree.
 74    - Examine the host services for suspicious or anomalous entries.
 75      - $osquery_1
 76      - $osquery_2
 77      - $osquery_3
 78  - Retrieve the files' SHA-256 hash values using the PowerShell `Get-FileHash` cmdlet and search for the existence and reputation of the hashes in resources like VirusTotal, Hybrid-Analysis, CISCO Talos, Any.run, etc.
 79- Investigate potentially compromised accounts. Analysts can do this by searching for login events (for example, 4624) to the target host after the registry modification.
 80
 81### False positive analysis
 82
 83- This rule uses a Kerberos-related port but does not identify the protocol used on that port. HTTP traffic on a non-standard port or destination IP address unrelated to Domain controllers can create false positives.
 84- Exceptions can be added for noisy/frequent connections.
 85
 86### Response and remediation
 87
 88- Initiate the incident response process based on the outcome of the triage.
 89- Isolate the involved host to prevent further post-compromise behavior.
 90- Investigate credential exposure on systems compromised or used by the attacker to ensure all compromised accounts are identified. Reset passwords for these accounts and other potentially compromised credentials, such as email, business systems, and web services.
 91  - Ticket requests can be used to investigate potentially compromised accounts.
 92- If the triage identified malware, search the environment for additional compromised hosts.
 93  - Implement temporary network rules, procedures, and segmentation to contain the malware.
 94  - Stop suspicious processes.
 95  - Immediately block the identified indicators of compromise (IoCs).
 96  - Inspect the affected systems for additional malware backdoors like reverse shells, reverse proxies, or droppers that attackers could use to reinfect the system.
 97- Remove and block malicious artifacts identified during triage.
 98- Run a full antimalware scan. This may reveal additional artifacts left in the system, persistence mechanisms, and malware components.
 99- Determine the initial vector abused by the attacker and take action to prevent reinfection through the same vector.
100- Using the incident response data, update logging and audit policies to improve the mean time to detect (MTTD) and the mean time to respond (MTTR).
101"""
102risk_score = 47
103rule_id = "897dc6b5-b39f-432a-8d75-d3730d50c782"
104severity = "medium"
105tags = [
106    "Domain: Endpoint",
107    "OS: Windows",
108    "Use Case: Threat Detection",
109    "Tactic: Credential Access",
110    "Resources: Investigation Guide",
111    "Data Source: Elastic Defend",
112    "Data Source: SentinelOne",
113]
114timestamp_override = "event.ingested"
115type = "eql"
116
117query = '''
118network where host.os.type == "windows" and event.type == "start" and network.direction == "egress" and
119  destination.port == 88 and source.port >= 49152 and process.pid != 4 and destination.address : "*" and
120  not 
121  (
122    process.executable : (
123        "\\device\\harddiskvolume?\\program files (x86)\\nmap\\nmap.exe",
124        "\\device\\harddiskvolume?\\program files (x86)\\nmap oem\\nmap.exe",
125        "\\device\\harddiskvolume?\\windows\\system32\\lsass.exe",
126        "?:\\Program Files\\Amazon Corretto\\jdk1*\\bin\\java.exe",
127        "?:\\Program Files\\BlackBerry\\UEM\\Proxy Server\\bin\\prunsrv.exe",
128        "?:\\Program Files\\BlackBerry\\UEM\\Core\\tomcat-core\\bin\\tomcat9.exe",
129        "?:\\Program Files\\DBeaver\\dbeaver.exe",
130        "?:\\Program Files\\Docker\\Docker\\resources\\com.docker.backend.exe",
131        "?:\\Program Files\\Docker\\Docker\\resources\\com.docker.vpnkit.exe",
132        "?:\\Program Files\\Docker\\Docker\\resources\\vpnkit.exe",
133        "?:\\Program Files\\Google\\Chrome\\Application\\chrome.exe",
134        "?:\\Program Files\\Internet Explorer\\iexplore.exe",
135        "?:\\Program Files\\JetBrains\\PyCharm Community Edition*\\bin\\pycharm64.exe",
136        "?:\\Program Files\\Mozilla Firefox\\firefox.exe",
137        "?:\\Program Files\\Oracle\\VirtualBox\\VirtualBoxVM.exe",
138        "?:\\Program Files\\Puppet Labs\\Puppet\\puppet\\bin\\ruby.exe",
139        "?:\\Program Files\\rapid7\\nexpose\\nse\\.DLLCACHE\\nseserv.exe",
140        "?:\\Program Files\\Silverfort\\Silverfort AD Adapter\\SilverfortServer.exe",
141        "?:\\Program Files\\Tenable\\Nessus\\nessusd.exe",
142        "?:\\Program Files\\VMware\\VMware View\\Server\\bin\\ws_TomcatService.exe",
143        "?:\\Program Files (x86)\\Advanced Port Scanner\\advanced_port_scanner.exe",
144        "?:\\Program Files (x86)\\DesktopCentral_Agent\\bin\\dcpatchscan.exe",
145        "?:\\Program Files (x86)\\GFI\\LanGuard 12 Agent\\lnsscomm.exe",
146        "?:\\Program Files (x86)\\Google\\Chrome\\Application\\chrome.exe",
147        "?:\\Program Files (x86)\\Internet Explorer\\iexplore.exe",
148        "?:\\Program Files (x86)\\Microsoft\\Edge\\Application\\msedge.exe",
149        "?:\\Program Files (x86)\\Microsoft\\EdgeUpdate\\MicrosoftEdgeUpdate.exe",
150        "?:\\Program Files (x86)\\Microsoft Silverlight\\sllauncher.exe",
151        "?:\\Program Files (x86)\\Nmap\\nmap.exe",
152        "?:\\Program Files (x86)\\Nmap OEM\\nmap.exe",
153        "?:\\Program Files (x86)\\nwps\\NetScanTools Pro\\NSTPRO.exe",
154        "?:\\Program Files (x86)\\SAP BusinessObjects\\tomcat\\bin\\tomcat9.exe",
155        "?:\\Program Files (x86)\\SuperScan\\scanner.exe",
156        "?:\\Program Files (x86)\\Zscaler\\ZSATunnel\\ZSATunnel.exe",
157        "?:\\Windows\\System32\\lsass.exe",
158        "?:\\Windows\\System32\\MicrosoftEdgeCP.exe",
159        "?:\\Windows\\System32\\svchost.exe",
160        "?:\\Windows\\SysWOW64\\vmnat.exe",
161        "?:\\Windows\\SystemApps\\Microsoft.MicrosoftEdge_*\\MicrosoftEdge.exe",
162        "System"
163    ) and process.code_signature.trusted == true
164  ) and
165 destination.address != "127.0.0.1" and destination.address != "::1"
166'''
167
168
169[[rule.threat]]
170framework = "MITRE ATT&CK"
171[[rule.threat.technique]]
172id = "T1558"
173name = "Steal or Forge Kerberos Tickets"
174reference = "https://attack.mitre.org/techniques/T1558/"
175
176
177[rule.threat.tactic]
178id = "TA0006"
179name = "Credential Access"
180reference = "https://attack.mitre.org/tactics/TA0006/"