Suspicious ScreenConnect Client Child Process

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
Data Source: System

Version: 205

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

edit

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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