ScreenConnect Server Spawning Suspicious Processes

 1[metadata]
 2creation_date = "2024/03/26"
 3integration = ["endpoint", "windows"]
 4maturity = "production"
 5updated_date = "2024/05/21"
 6
 7[rule]
 8author = ["Elastic"]
 9description = """
10Identifies suspicious processes being spawned by the ScreenConnect server process (ScreenConnect.Service.exe). This
11activity may indicate exploitation activity or access to an existing web shell backdoor.
12"""
13from = "now-9m"
14index = [
15    "logs-endpoint.events.process-*",
16    "winlogbeat-*",
17    "logs-windows.sysmon_operational-*",
18    "logs-system.security*",
19    "endgame-*",
20]
21language = "eql"
22license = "Elastic License v2"
23name = "ScreenConnect Server Spawning Suspicious Processes"
24references = ["https://blackpointcyber.com/resources/blog/breaking-through-the-screen/"]
25risk_score = 73
26rule_id = "3d00feab-e203-4acc-a463-c3e15b7e9a73"
27severity = "high"
28tags = [
29    "Domain: Endpoint",
30    "OS: Windows",
31    "Use Case: Threat Detection",
32    "Tactic: Initial Access",
33    "Tactic: Execution",
34    "Data Source: Elastic Endgame",
35    "Data Source: Elastic Defend",
36    "Data Source: Sysmon",
37]
38timestamp_override = "event.ingested"
39type = "eql"
40
41query = '''
42process where host.os.type == "windows" and event.type == "start" and
43  process.parent.name : "ScreenConnect.Service.exe" and
44  (process.name : ("cmd.exe", "powershell.exe", "pwsh.exe", "powershell_ise.exe", "csc.exe") or
45  ?process.pe.original_file_name in ("cmd.exe", "powershell.exe", "pwsh.dll", "powershell_ise.exe"))
46'''
47
48
49[[rule.threat]]
50framework = "MITRE ATT&CK"
51[[rule.threat.technique]]
52id = "T1190"
53name = "Exploit Public-Facing Application"
54reference = "https://attack.mitre.org/techniques/T1190/"
55
56
57[rule.threat.tactic]
58id = "TA0001"
59name = "Initial Access"
60reference = "https://attack.mitre.org/tactics/TA0001/"
61[[rule.threat]]
62framework = "MITRE ATT&CK"
63[[rule.threat.technique]]
64id = "T1059"
65name = "Command and Scripting Interpreter"
66reference = "https://attack.mitre.org/techniques/T1059/"
67[[rule.threat.technique.subtechnique]]
68id = "T1059.001"
69name = "PowerShell"
70reference = "https://attack.mitre.org/techniques/T1059/001/"
71
72[[rule.threat.technique.subtechnique]]
73id = "T1059.003"
74name = "Windows Command Shell"
75reference = "https://attack.mitre.org/techniques/T1059/003/"
76
77
78
79[rule.threat.tactic]
80id = "TA0002"
81name = "Execution"
82reference = "https://attack.mitre.org/tactics/TA0002/"