Suspicious ScreenConnect Client Child Process

 1[metadata]
 2creation_date = "2024/03/27"
 3integration = ["endpoint", "windows"]
 4maturity = "production"
 5updated_date = "2024/03/28"
 6min_stack_comments = "New fields added: required_fields, related_integrations, setup"
 7min_stack_version = "8.3.0"
 8
 9
10[rule]
11author = ["Elastic"]
12description = """
13Identifies suspicious processes being spawned by the ScreenConnect client processes. This activity may indicate execution
14abusing unauthorized access to the ScreenConnect remote access software.
15"""
16from = "now-9m"
17index = ["logs-endpoint.events.process-*", "winlogbeat-*", "logs-windows.sysmon_operational-*", "logs-system.security*", "endgame-*"]
18language = "eql"
19license = "Elastic License v2"
20name = "Suspicious ScreenConnect Client Child Process"
21references = ["https://www.huntress.com/blog/slashandgrab-screen-connect-post-exploitation-in-the-wild-cve-2024-1709-cve-2024-1708"]
22risk_score = 47
23rule_id = "78de1aeb-5225-4067-b8cc-f4a1de8a8546"
24severity = "medium"
25tags = [
26    "Domain: Endpoint",
27    "OS: Windows",
28    "Use Case: Threat Detection",
29    "Tactic: Command and Control",
30    "Resources: Investigation Guide",
31    "Data Source: Elastic Endgame",
32    "Data Source: Elastic Defend",
33    "Data Source: Sysmon"
34]
35timestamp_override = "event.ingested"
36type = "eql"
37
38query = '''
39process where host.os.type == "windows" and event.type == "start" and
40  process.parent.name :
41                ("ScreenConnect.ClientService.exe",
42                 "ScreenConnect.WindowsClient.exe",
43                 "ScreenConnect.WindowsBackstageShell.exe",
44                 "ScreenConnect.WindowsFileManager.exe") and
45  (
46   (process.name : "powershell.exe" and
47    process.args : ("-enc", "-ec", "-e", "*downloadstring*", "*Reflection.Assembly*", "*http*")) or
48   (process.name : "cmd.exe" and process.args : "/c") or
49   (process.name : "net.exe" and process.args : "/add") or
50   (process.name : "schtasks.exe" and process.args : ("/create", "-create")) or
51   (process.name : "sc.exe" and process.args : "create") or
52   (process.name : "rundll32.exe" and not process.args : "url.dll,FileProtocolHandler") or
53   (process.name : "msiexec.exe" and process.args : ("/i", "-i") and
54    process.args : ("/q", "/quiet", "/qn", "-q", "-quiet", "-qn", "-Q+")) or
55   process.name : ("mshta.exe", "certutil.exe", "bistadmin.exe", "certreq.exe", "wscript.exe", "cscript.exe", "curl.exe", 
56                   "ssh.exe", "scp.exe", "wevtutil.exe", "wget.exe", "wmic.exe")
57   )
58'''
59
60
61[[rule.threat]]
62framework = "MITRE ATT&CK"
63[[rule.threat.technique]]
64id = "T1219"
65name = "Remote Access Software"
66reference = "https://attack.mitre.org/techniques/T1219/"
67
68
69[rule.threat.tactic]
70id = "TA0011"
71name = "Command and Control"
72reference = "https://attack.mitre.org/tactics/TA0011/"