Potential SAP NetWeaver WebShell Creation

[metadata]
creation_date = "2025/04/26"
integration = ["endpoint"]
maturity = "production"
updated_date = "2026/03/24"

[rule]
author = ["Elastic"]
description = """
Identifies suspicious Java file creation in the IRJ directory of the SAP NetWeaver application. This may indicate an attempt to deploy a webshell.
"""
from = "now-9m"
index = ["auditbeat-*", "logs-endpoint.events.file*"]
language = "eql"
license = "Elastic License v2"
name = "Potential SAP NetWeaver WebShell Creation"
references = [
    "https://reliaquest.com/blog/threat-spotlight-reliaquest-uncovers-vulnerability-behind-sap-netweaver-compromise/",
    "https://onapsis.com/blog/active-exploitation-of-sap-vulnerability-cve-2025-31324/"
]
risk_score = 73
rule_id = "f7d588ba-e4b0-442e-879d-7ec39fbd69c5"
severity = "high"
tags = [
    "Domain: Endpoint",
    "OS: Linux",
    "OS: Windows",
    "Use Case: Threat Detection",
    "Tactic: Execution",
    "Use Case: Vulnerability",
    "Data Source: Elastic Defend",
    "Resources: Investigation Guide",
]
timestamp_override = "event.ingested"
type = "eql"

query = '''
file where host.os.type in ("linux", "windows") and event.action == "creation" and
 file.extension : ("jsp", "java", "class") and
 file.path : ("/*/sap.com/*/servlet_jsp/irj/root/*",
              "/*/sap.com/*/servlet_jsp/irj/work/*",
              "?:\\*\\sap.com\\*\\servlet_jsp\\irj\\root\\*",
              "?:\\*\\sap.com\\*\\servlet_jsp\\irj\\work\\*")
'''
note = """## Triage and analysis

### Investigating Potential SAP NetWeaver WebShell Creation

### Possible investigation steps

- Examine the file creation event and the associated HTTP post request logs details to identify the source of the creation.
- Examine the process tree to verify the parent-child relationship between the Java process and any suspicious child processes such as shell scripts or scripting languages (e.g., sh, bash, curl, python).
- Check the command line arguments and environment variables of the suspicious child processes to identify any potentially malicious payloads or commands being executed.
- Investigate the host's recent activity and logs for any other indicators of compromise or unusual behavior that might correlate with the suspected exploitation attempt.
- Assess the system for any unauthorized changes or new files that may have been introduced as a result of the exploitation attempt, focusing on JSP files under the IRJ root directory.


### Response and remediation

- Immediately isolate the affected host from the network to prevent further outbound connections and potential lateral movement.
- Terminate any suspicious Java processes identified in the alert, especially those making outbound connections to LDAP, RMI, or DNS ports.
- Conduct a thorough review of the affected system for any unauthorized changes or additional malicious processes, focusing on child processes like shell scripts or scripting languages.
- Restore the affected system from a known good backup if unauthorized changes or malware are detected.
- Update and patch Java and any related applications to the latest versions to mitigate known vulnerabilities.
- Escalate the incident to the security operations center (SOC) or incident response team for further investigation and to assess the potential impact on other systems within the network."""


[[rule.threat]]
framework = "MITRE ATT&CK"

[[rule.threat.technique]]
id = "T1059"
name = "Command and Scripting Interpreter"
reference = "https://attack.mitre.org/techniques/T1059/"

[[rule.threat.technique.subtechnique]]
id = "T1059.007"
name = "JavaScript"
reference = "https://attack.mitre.org/techniques/T1059/007/"

[[rule.threat.technique]]
id = "T1203"
name = "Exploitation for Client Execution"
reference = "https://attack.mitre.org/techniques/T1203/"

[rule.threat.tactic]
id = "TA0002"
name = "Execution"
reference = "https://attack.mitre.org/tactics/TA0002/"

[[rule.threat]]
framework = "MITRE ATT&CK"

[[rule.threat.technique]]
id = "T1505"
name = "Server Software Component"
reference = "https://attack.mitre.org/techniques/T1505/"

[[rule.threat.technique.subtechnique]]
id = "T1505.003"
name = "Web Shell"
reference = "https://attack.mitre.org/techniques/T1505/003/"

[rule.threat.tactic]
id = "TA0003"
name = "Persistence"
reference = "https://attack.mitre.org/tactics/TA0003/"