initial_access_exploit_jetbrains_teamcity.toml

[metadata]
creation_date = "2024/03/24"
integration = ["endpoint", "windows", "system"]
maturity = "production"
updated_date = "2024/05/21"

[rule]
author = ["Elastic"]
description = """
Identifies suspicious processes being spawned by the JetBrain TeamCity process. This activity could be related to
JetBrains remote code execution vulnerabilities.
"""
false_positives = [
    """
    Powershell and Windows Command Shell are often observed as legit child processes of the Jetbrains TeamCity service
    and may require further tuning.
    """,
]
from = "now-9m"
index = [
    "logs-endpoint.events.process-*",
    "winlogbeat-*",
    "logs-windows.*",
    "endgame-*",
    "logs-system.security*",
]
language = "eql"
license = "Elastic License v2"
name = "Suspicious JetBrains TeamCity Child Process"
references = [
    "https://www.trendmicro.com/en_us/research/24/c/teamcity-vulnerability-exploits-lead-to-jasmin-ransomware.html",
]
risk_score = 47
rule_id = "730ed57d-ae0f-444f-af50-78708b57edd5"
severity = "medium"
tags = [
    "Domain: Endpoint",
    "OS: Windows",
    "Use Case: Threat Detection",
    "Tactic: Initial Access",
    "Data Source: Elastic Endgame",
    "Use Case: Vulnerability",
    "Data Source: Elastic Defend",
]
timestamp_override = "event.ingested"
type = "eql"

query = '''
process where host.os.type == "windows" and event.type == "start" and
  process.parent.executable :
                 ("?:\\TeamCity\\jre\\bin\\java.exe",
                  "?:\\Program Files\\TeamCity\\jre\\bin\\java.exe",
                  "?:\\Program Files (x86)\\TeamCity\\jre\\bin\\java.exe",
                  "?:\\TeamCity\\BuildAgent\\jre\\bin\\java.exe") and
  process.name : ("cmd.exe", "powershell.exe", "msiexec.exe", "certutil.exe", "bitsadmin.exe", "wmic.exe", "curl.exe", "ssh.exe",
                   "rundll32.exe", "regsvr32.exe", "mshta.exe", "certreq.exe", "net.exe", "nltest.exe", "whoami.exe", "hostname.exe",
                   "tasklist.exe", "arp.exe", "nbtstat.exe", "netstat.exe", "reg.exe", "tasklist.exe", "Microsoft.Workflow.Compiler.exe",
                   "arp.exe", "atbroker.exe", "bginfo.exe", "bitsadmin.exe", "cdb.exe", "cmstp.exe", "control.exe", "cscript.exe", "csi.exe",
                   "dnx.exe", "dsget.exe", "dsquery.exe", "forfiles.exe", "fsi.exe", "ftp.exe", "gpresult.exe", "ieexec.exe", "iexpress.exe",
                   "installutil.exe", "ipconfig.exe","msxsl.exe", "netsh.exe", "odbcconf.exe", "ping.exe", "pwsh.exe", "qprocess.exe",
                   "quser.exe", "qwinsta.exe", "rcsi.exe", "regasm.exe", "regsvcs.exe", "regsvr32.exe", "sc.exe", "schtasks.exe",
                   "systeminfo.exe", "tracert.exe", "wmic.exe", "wscript.exe","xwizard.exe", "explorer.exe", "msdt.exe") and
 not (process.name : "powershell.exe" and process.args : "-ExecutionPolicy" and process.args : "?:\\TeamCity\\buildAgent\\work\\*.ps1") and
 not (process.name : "cmd.exe" and process.args : "dir" and process.args : "/-c")
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1190"
name = "Exploit Public-Facing Application"
reference = "https://attack.mitre.org/techniques/T1190/"


[rule.threat.tactic]
id = "TA0001"
name = "Initial Access"
reference = "https://attack.mitre.org/tactics/TA0001/"
[[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 = "T1059.001"
name = "PowerShell"
reference = "https://attack.mitre.org/techniques/T1059/001/"

[[rule.threat.technique.subtechnique]]
id = "T1059.003"
name = "Windows Command Shell"
reference = "https://attack.mitre.org/techniques/T1059/003/"



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