Suspicious ScreenConnect Client Child Process

 1[metadata]
 2creation_date = "2024/03/27"
 3integration = ["endpoint", "windows", "sentinel_one_cloud_funnel", "m365_defender", "system"]
 4maturity = "production"
 5min_stack_comments = "Breaking change at 8.14.0 for the Windows Integration."
 6min_stack_version = "8.14.0"
 7updated_date = "2024/10/17"
 8
 9[rule]
10author = ["Elastic"]
11description = """
12Identifies suspicious processes being spawned by the ScreenConnect client processes. This activity may indicate execution
13abusing unauthorized access to the ScreenConnect remote access software.
14"""
15from = "now-9m"
16index = ["logs-endpoint.events.process-*", "winlogbeat-*", "logs-windows.sysmon_operational-*", "logs-system.security*", "endgame-*", "logs-sentinel_one_cloud_funnel.*", "logs-m365_defender.event-*"]
17language = "eql"
18license = "Elastic License v2"
19name = "Suspicious ScreenConnect Client Child Process"
20references = ["https://www.huntress.com/blog/slashandgrab-screen-connect-post-exploitation-in-the-wild-cve-2024-1709-cve-2024-1708"]
21risk_score = 47
22rule_id = "78de1aeb-5225-4067-b8cc-f4a1de8a8546"
23severity = "medium"
24tags = [
25    "Domain: Endpoint",
26    "OS: Windows",
27    "Use Case: Threat Detection",
28    "Tactic: Command and Control",
29    "Resources: Investigation Guide",
30    "Data Source: Elastic Endgame",
31    "Data Source: Elastic Defend",
32    "Data Source: Sysmon",
33    "Data Source: SentinelOne",
34    "Data Source: Microsoft Defender for Endpoint",
35    "Data Source: System",
36]
37timestamp_override = "event.ingested"
38type = "eql"
39
40query = '''
41process where host.os.type == "windows" and event.type == "start" and
42  process.parent.name :
43                ("ScreenConnect.ClientService.exe",
44                 "ScreenConnect.WindowsClient.exe",
45                 "ScreenConnect.WindowsBackstageShell.exe",
46                 "ScreenConnect.WindowsFileManager.exe") and
47  (
48   (process.name : "powershell.exe" and
49    process.args : ("-enc", "-ec", "-e", "*downloadstring*", "*Reflection.Assembly*", "*http*")) or
50   (process.name : "cmd.exe" and process.args : "/c") or
51   (process.name : "net.exe" and process.args : "/add") or
52   (process.name : "schtasks.exe" and process.args : ("/create", "-create")) or
53   (process.name : "sc.exe" and process.args : "create") or
54   (process.name : "rundll32.exe" and not process.args : "url.dll,FileProtocolHandler") or
55   (process.name : "msiexec.exe" and process.args : ("/i", "-i") and
56    process.args : ("/q", "/quiet", "/qn", "-q", "-quiet", "-qn", "-Q+")) or
57   process.name : ("mshta.exe", "certutil.exe", "bistadmin.exe", "certreq.exe", "wscript.exe", "cscript.exe", "curl.exe",
58                   "ssh.exe", "scp.exe", "wevtutil.exe", "wget.exe", "wmic.exe")
59   )
60'''
61
62
63[[rule.threat]]
64framework = "MITRE ATT&CK"
65[[rule.threat.technique]]
66id = "T1219"
67name = "Remote Access Software"
68reference = "https://attack.mitre.org/techniques/T1219/"
69
70
71[rule.threat.tactic]
72id = "TA0011"
73name = "Command and Control"
74reference = "https://attack.mitre.org/tactics/TA0011/"