requests to this specific endpoint via this method should not be common. investigate further to determine if the request is legitimate, and apply appropriate filters to reduce false positives.

Techniques

T1190

Sample rules

JetBrains TeamCity RCE Attempt

source: splunk
technicques:
- T1190

Description

The following analytic detects attempts to exploit the CVE-2023-42793 vulnerability in JetBrains TeamCity On-Premises. It identifies suspicious POST requests to /app/rest/users/id:1/tokens/RPC2, leveraging the Web datamodel to monitor specific URL patterns and HTTP methods. This activity is significant as it may indicate an unauthenticated attacker attempting to gain administrative access via Remote Code Execution (RCE). If confirmed malicious, this could allow the attacker to execute arbitrary code, potentially compromising the entire TeamCity environment and leading to further unauthorized access and data breaches.

Detection logic


| tstats `security_content_summariesonly`
  count min(_time) as firstTime
        max(_time) as lastTime

FROM datamodel=Web WHERE

Web.url="*/app/rest/users/id:1/tokens/RPC2*"
Web.status=200
Web.http_method="POST"

BY Web.http_user_agent Web.status Web.http_method
   Web.url Web.url_length Web.src Web.dest


| `drop_dm_object_name("Web")`

| `security_content_ctime(firstTime)`

| `security_content_ctime(lastTime)`

| `jetbrains_teamcity_rce_attempt_filter`