Remotely Started Services via RPC

  1[metadata]
  2creation_date = "2020/11/16"
  3integration = ["endpoint", "windows"]
  4maturity = "production"
  5updated_date = "2026/05/04"
  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 remote execution of Windows services over remote procedure call (RPC). This could be indicative of lateral
 37movement, but will be noisy if commonly done by administrators.
 38"""
 39from = "now-9m"
 40index = [
 41    "logs-endpoint.events.process-*",
 42    "logs-endpoint.events.network-*",
 43    "winlogbeat-*",
 44    "logs-windows.sysmon_operational-*",
 45]
 46language = "eql"
 47license = "Elastic License v2"
 48name = "Remotely Started Services via RPC"
 49note = """## Triage and analysis
 50
 51### Investigating Remotely Started Services via RPC
 52
 53The Service Control Manager Remote Protocol is a client/server protocol used for configuring and controlling service programs running on a remote computer. A remote service management session begins with the client initiating the connection request to the server. If the server grants the request, the connection is established. The client can then make multiple requests to modify, query the configuration, or start and stop services on the server by using the same session until the session is terminated.
 54
 55This rule detects the remote creation or start of a service by correlating a `services.exe` network connection and the spawn of a child process.
 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- Review login events (e.g., 4624) in the alert timeframe to identify the account used to perform this action. Use the `source.address` field to help identify the source system.
 63- Review network events from the source system using the source port identified on the alert and try to identify the program used to initiate the action.
 64- 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.
 65- Investigate any abnormal behavior by the subject process such as network connections, registry or file modifications, and any spawned child processes.
 66- Investigate other alerts associated with the user/host during the past 48 hours.
 67- Validate if the activity is not related to planned patches, updates, network administrator activity, or legitimate software installations.
 68- Examine the host for derived artifacts that indicate suspicious activities:
 69  - Analyze the process executable using a private sandboxed analysis system.
 70  - Observe and collect information about the following activities in both the sandbox and the alert subject host:
 71    - Attempts to contact external domains and addresses.
 72      - Use the Elastic Defend network events to determine domains and addresses contacted by the subject process by filtering by the process' `process.entity_id`.
 73      - Examine the DNS cache for suspicious or anomalous entries.
 74        - $osquery_0
 75    - Use the Elastic Defend registry events to examine registry keys accessed, modified, or created by the related processes in the process tree.
 76    - Examine the host services for suspicious or anomalous entries.
 77      - $osquery_1
 78      - $osquery_2
 79      - $osquery_3
 80  - 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.
 81- Investigate potentially compromised accounts. Analysts can do this by searching for login events (for example, 4624) to the target host after the registry modification.
 82
 83
 84### False positive analysis
 85
 86- Remote management software like SCCM may trigger this rule. If noisy on your environment, consider adding exceptions.
 87
 88### Response and remediation
 89
 90- Initiate the incident response process based on the outcome of the triage.
 91- Isolate the involved hosts to prevent further post-compromise behavior.
 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- 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.
 99- Run a full antimalware scan. This may reveal additional artifacts left in the system, persistence mechanisms, and malware components.
100- Determine the initial vector abused by the attacker and take action to prevent reinfection through the same vector.
101- 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).
102"""
103
104setup = """## Setup
105
106This rule is designed for data generated by [Elastic Defend](https://www.elastic.co/security/endpoint-security), which provides native endpoint detection and response, along with event enrichments designed to work with our detection rules.
107
108Setup instructions: https://ela.st/install-elastic-defend
109
110### Additional data sources
111
112This rule also supports the following third-party data sources. For setup instructions, refer to the links below:
113
114- [Sysmon Event ID 1 - Process Creation](https://ela.st/sysmon-event-1-setup)
115- [Sysmon Event ID 3 - Network Connection](https://ela.st/sysmon-event-3-setup)
116"""
117
118references = [
119    "https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-scmr/705b624a-13de-43cc-b8a2-99573da3635f",
120    "https://www.elastic.co/security-labs/elastic-protects-against-data-wiper-malware-targeting-ukraine-hermeticwiper",
121]
122risk_score = 47
123rule_id = "aa9a274d-6b53-424d-ac5e-cb8ca4251650"
124severity = "medium"
125tags = [
126    "Domain: Endpoint",
127    "OS: Windows",
128    "Use Case: Threat Detection",
129    "Tactic: Lateral Movement",
130    "Resources: Investigation Guide",
131    "Data Source: Elastic Defend",
132    "Data Source: Sysmon",
133]
134type = "eql"
135
136query = '''
137sequence with maxspan=1s
138   [network where host.os.type == "windows" and process.name : "services.exe" and
139      network.direction : ("incoming", "ingress") and network.transport == "tcp" and
140      source.port >= 49152 and destination.port >= 49152 and source.ip != "127.0.0.1" and source.ip != "::1"
141   ] by host.id, process.entity_id
142   [process where host.os.type == "windows" and 
143       event.type == "start" and process.parent.name : "services.exe" and
144       not (process.executable : "?:\\Windows\\System32\\msiexec.exe" and process.args : "/V") and
145       not process.executable : (
146                "?:\\Pella Corporation\\OSCToGPAutoService\\OSCToGPAutoSvc.exe",
147                "?:\\Pella Corporation\\Pella Order Management\\GPAutoSvc.exe",
148                "?:\\Pella Corporation\\Pella Order Management\\GPAutoSvc.exe",
149                "?:\\Program Files (x86)\\*.exe",
150                "?:\\Program Files\\*.exe",
151                "?:\\Windows\\ADCR_Agent\\adcrsvc.exe",
152                "?:\\Windows\\AdminArsenal\\PDQ*.exe",
153                "?:\\Windows\\CAInvokerService.exe",
154                "?:\\Windows\\ccmsetup\\ccmsetup.exe",
155                "?:\\Windows\\eset-remote-install-service.exe",
156                "?:\\Windows\\ProPatches\\Scheduler\\STSchedEx.exe",
157                "?:\\Windows\\PSEXESVC.EXE",
158                "?:\\Windows\\RemoteAuditService.exe",
159                "?:\\Windows\\servicing\\TrustedInstaller.exe",
160                "?:\\Windows\\System32\\certsrv.exe",
161                "?:\\Windows\\System32\\sppsvc.exe",
162                "?:\\Windows\\System32\\srmhost.exe",
163                "?:\\Windows\\System32\\svchost.exe",
164                "?:\\Windows\\System32\\taskhostex.exe",
165                "?:\\Windows\\System32\\upfc.exe",
166                "?:\\Windows\\System32\\vds.exe",
167                "?:\\Windows\\System32\\VSSVC.exe",
168                "?:\\Windows\\System32\\wbem\\WmiApSrv.exe",
169                "?:\\Windows\\SysWOW64\\NwxExeSvc\\NwxExeSvc.exe",
170                "?:\\Windows\\Veeam\\Backup\\VeeamDeploymentSvc.exe",
171                "?:\\Windows\\VeeamLogShipper\\VeeamLogShipper.exe",
172                "?:\\Windows\\VeeamVssSupport\\VeeamGuestHelper.exe"
173       )] by host.id, process.parent.entity_id
174'''
175
176
177[[rule.threat]]
178framework = "MITRE ATT&CK"
179
180[[rule.threat.technique]]
181id = "T1021"
182name = "Remote Services"
183reference = "https://attack.mitre.org/techniques/T1021/"
184
185[rule.threat.tactic]
186id = "TA0008"
187name = "Lateral Movement"
188reference = "https://attack.mitre.org/tactics/TA0008/"
189
190[[rule.threat]]
191framework = "MITRE ATT&CK"
192
193[[rule.threat.technique]]
194id = "T1569"
195name = "System Services"
196reference = "https://attack.mitre.org/techniques/T1569/"
197
198[[rule.threat.technique.subtechnique]]
199id = "T1569.002"
200name = "Service Execution"
201reference = "https://attack.mitre.org/techniques/T1569/002/"
202
203[rule.threat.tactic]
204id = "TA0002"
205name = "Execution"
206reference = "https://attack.mitre.org/tactics/TA0002/"