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Suspicious ScreenConnect Client Child Process

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Suspicious ScreenConnect Client Child Process

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Identifies suspicious processes being spawned by the ScreenConnect client processes. This activity may indicate execution abusing unauthorized access to the ScreenConnect remote access software.

Rule type: eql

Rule indices:

logs-endpoint.events.process-*
winlogbeat-*
logs-windows.sysmon_operational-*
logs-system.security*
endgame-*
logs-sentinel_one_cloud_funnel.*
logs-m365_defender.event-*

Severity: medium

Risk score: 47

Runs every: 5m

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

https://www.huntress.com/blog/slashandgrab-screen-connect-post-exploitation-in-the-wild-cve-2024-1709-cve-2024-1708

Tags:

Domain: Endpoint
OS: Windows
Use Case: Threat Detection
Tactic: Command and Control
Resources: Investigation Guide
Data Source: Elastic Endgame
Data Source: Elastic Defend
Data Source: Sysmon
Data Source: SentinelOne
Data Source: Microsoft Defender for Endpoint

Version: 204

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

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process where host.os.type == "windows" and event.type == "start" and
  process.parent.name :
                ("ScreenConnect.ClientService.exe",
                 "ScreenConnect.WindowsClient.exe",
                 "ScreenConnect.WindowsBackstageShell.exe",
                 "ScreenConnect.WindowsFileManager.exe") and
  (
   (process.name : "powershell.exe" and
    process.args : ("-enc", "-ec", "-e", "*downloadstring*", "*Reflection.Assembly*", "*http*")) or
   (process.name : "cmd.exe" and process.args : "/c") or
   (process.name : "net.exe" and process.args : "/add") or
   (process.name : "schtasks.exe" and process.args : ("/create", "-create")) or
   (process.name : "sc.exe" and process.args : "create") or
   (process.name : "rundll32.exe" and not process.args : "url.dll,FileProtocolHandler") or
   (process.name : "msiexec.exe" and process.args : ("/i", "-i") and
    process.args : ("/q", "/quiet", "/qn", "-q", "-quiet", "-qn", "-Q+")) or
   process.name : ("mshta.exe", "certutil.exe", "bistadmin.exe", "certreq.exe", "wscript.exe", "cscript.exe", "curl.exe",
                   "ssh.exe", "scp.exe", "wevtutil.exe", "wget.exe", "wmic.exe")
   )

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Command and Control
- ID: TA0011
- Reference URL: https://attack.mitre.org/tactics/TA0011/
Technique:
- Name: Remote Access Software
- ID: T1219
- Reference URL: https://attack.mitre.org/techniques/T1219/

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