Suspicious JetBrains TeamCity Child Process

 1[metadata]
 2creation_date = "2024/03/24"
 3integration = ["endpoint", "windows", "system"]
 4maturity = "production"
 5min_stack_comments = "New fields added: required_fields, related_integrations, setup"
 6min_stack_version = "8.3.0"
 7updated_date = "2024/03/28"
 8
 9[rule]
10author = ["Elastic"]
11description = """
12Identifies suspicious processes being spawned by the JetBrain TeamCity process. This activity could be related to
13JetBrains remote code execution vulnerabilities.
14"""
15false_positives = [
16    """
17    Powershell and Windows Command Shell are often observed as legit child processes of the Jetbrains TeamCity service
18    and may require further tuning.
19    """,
20]
21from = "now-9m"
22index = ["logs-endpoint.events.process-*", "winlogbeat-*", "logs-windows.*", "endgame-*", "logs-system.security*"]
23language = "eql"
24license = "Elastic License v2"
25name = "Suspicious JetBrains TeamCity Child Process"
26references = [
27   "https://www.trendmicro.com/en_us/research/24/c/teamcity-vulnerability-exploits-lead-to-jasmin-ransomware.html"
28]
29risk_score = 47
30rule_id = "730ed57d-ae0f-444f-af50-78708b57edd5"
31severity = "medium"
32tags = ["Domain: Endpoint", "OS: Windows", "Use Case: Threat Detection", "Tactic: Initial Access", "Data Source: Elastic Endgame", "Use Case: Vulnerability", "Data Source: Elastic Defend"]
33timestamp_override = "event.ingested"
34type = "eql"
35
36query = '''
37process where host.os.type == "windows" and event.type == "start" and
38  process.parent.executable :
39                 ("?:\\TeamCity\\jre\\bin\\java.exe",
40                  "?:\\Program Files\\TeamCity\\jre\\bin\\java.exe",
41                  "?:\\Program Files (x86)\\TeamCity\\jre\\bin\\java.exe",
42                  "?:\\TeamCity\\BuildAgent\\jre\\bin\\java.exe") and
43  process.name : ("cmd.exe", "powershell.exe", "msiexec.exe", "certutil.exe", "bitsadmin.exe", "wmic.exe", "curl.exe", "ssh.exe",
44                   "rundll32.exe", "regsvr32.exe", "mshta.exe", "certreq.exe", "net.exe", "nltest.exe", "whoami.exe", "hostname.exe",
45                   "tasklist.exe", "arp.exe", "nbtstat.exe", "netstat.exe", "reg.exe", "tasklist.exe", "Microsoft.Workflow.Compiler.exe",
46                   "arp.exe", "atbroker.exe", "bginfo.exe", "bitsadmin.exe", "cdb.exe", "cmstp.exe", "control.exe", "cscript.exe", "csi.exe",
47                   "dnx.exe", "dsget.exe", "dsquery.exe", "forfiles.exe", "fsi.exe", "ftp.exe", "gpresult.exe", "ieexec.exe", "iexpress.exe",
48                   "installutil.exe", "ipconfig.exe","msxsl.exe", "netsh.exe", "odbcconf.exe", "ping.exe", "pwsh.exe", "qprocess.exe",
49                   "quser.exe", "qwinsta.exe", "rcsi.exe", "regasm.exe", "regsvcs.exe", "regsvr32.exe", "sc.exe", "schtasks.exe",
50                   "systeminfo.exe", "tracert.exe", "wmic.exe", "wscript.exe","xwizard.exe", "explorer.exe", "msdt.exe") and
51 not (process.name : "powershell.exe" and process.args : "-ExecutionPolicy" and process.args : "?:\\TeamCity\\buildAgent\\work\\*.ps1") and
52 not (process.name : "cmd.exe" and process.args : "dir" and process.args : "/-c")
53'''
54
55
56[[rule.threat]]
57framework = "MITRE ATT&CK"
58[[rule.threat.technique]]
59id = "T1190"
60name = "Exploit Public-Facing Application"
61reference = "https://attack.mitre.org/techniques/T1190/"
62
63
64[rule.threat.tactic]
65id = "TA0001"
66name = "Initial Access"
67reference = "https://attack.mitre.org/tactics/TA0001/"
68
69
70[[rule.threat]]
71framework = "MITRE ATT&CK"
72[[rule.threat.technique]]
73id = "T1059"
74name = "Command and Scripting Interpreter"
75reference = "https://attack.mitre.org/techniques/T1059/"
76[[rule.threat.technique.subtechnique]]
77id = "T1059.001"
78name = "PowerShell"
79reference = "https://attack.mitre.org/techniques/T1059/001/"
80[[rule.threat.technique.subtechnique]]
81id = "T1059.003"
82name = "Windows Command Shell"
83reference = "https://attack.mitre.org/techniques/T1059/003/"
84
85
86[rule.threat.tactic]
87id = "TA0002"
88name = "Execution"
89reference = "https://attack.mitre.org/tactics/TA0002/"