Suspicious Communication App Child Process
editSuspicious Communication App Child Process
editIdentifies suspicious child processes of communications apps, which can indicate a potential masquerading as the communication app or the exploitation of a vulnerability on the application causing it to execute code.
Rule type: eql
Rule indices:
- logs-endpoint.events.process-*
Severity: low
Risk score: 21
Runs every: 5m
Searches indices from: now-9m (Date Math format, see also Additional look-back time
)
Maximum alerts per execution: 100
References: None
Tags:
- Domain: Endpoint
- OS: Windows
- Use Case: Threat Detection
- Tactic: Defense Evasion
- Tactic: Persistence
- Rule Type: BBR
- Data Source: Elastic Defend
Version: 5
Rule authors:
- Elastic
Rule license: Elastic License v2
Rule query
editprocess where host.os.type == "windows" and event.type == "start" and ( /* Slack */ (process.parent.name : "slack.exe" and not ( ( process.executable : ( "?:\\Program Files\\*", "?:\\Program Files (x86)\\*", "?:\\Users\\*\\AppData\\Local\\Google\\Chrome\\Application\\chrome.exe", "?:\\Users\\*\\AppData\\Local\\Island\\Island\\Application\\Island.exe", "?:\\Users\\*\\AppData\\Roaming\\Zoom\\bin*\\Zoom.exe", "?:\\Windows\\System32\\rundll32.exe", "?:\\Users\\*\\AppData\\Local\\Mozilla Firefox\\firefox.exe", "?:\\Windows\\System32\\notepad.exe", "?:\\Windows\\System32\\WerFault.exe", "?:\\Windows\\SysWOW64\\WerFault.exe", "?:\\Users\\*\\AppData\\Local\\Programs\\Opera\\opera.exe" ) and process.code_signature.trusted == true ) or ( process.code_signature.subject_name : ( "Slack Technologies, Inc.", "Slack Technologies, LLC" ) and process.code_signature.trusted == true ) or ( (process.name : "powershell.exe" and process.command_line : "powershell.exe -c Invoke-WebRequest -Uri https://slackb.com/*") or (process.name : "cmd.exe" and process.command_line : "C:\\WINDOWS\\system32\\cmd.exe /d /s /c \"%windir%\\System32\\rundll32.exe User32.dll,SetFocus 0\"") ) ) ) or /* WebEx */ (process.parent.name : ("CiscoCollabHost.exe", "WebexHost.exe") and not ( ( process.executable : ( "?:\\Program Files\\*", "?:\\Program Files (x86)\\*", "?:\\Windows\\System32\\WerFault.exe", "?:\\Users\\*\\AppData\\Local\\Google\\Chrome\\Application\\chrome.exe", "?:\\Users\\*\\AppData\\Local\\Mozilla Firefox\\firefox.exe", "?:\\Users\\*\\AppData\\Local\\Programs\\Opera\\opera.exe" ) and process.code_signature.trusted == true ) or ( process.code_signature.subject_name : ( "Cisco Systems, Inc.", "Cisco WebEx LLC", "Cisco Systems Inc." ) and process.code_signature.trusted == true ) ) ) or /* Teams */ (process.parent.name : "Teams.exe" and not ( ( process.executable : ( "?:\\Program Files\\*", "?:\\Program Files (x86)\\*", "?:\\Windows\\System32\\WerFault.exe", "?:\\Windows\\SysWOW64\\WerFault.exe", "?:\\Windows\\BrowserCore\\BrowserCore.exe", "?:\\Users\\*\\AppData\\Local\\Google\\Chrome\\Application\\chrome.exe", "?:\\Users\\*\\AppData\\Local\\Mozilla Firefox\\firefox.exe" ) and process.code_signature.trusted == true ) or ( process.code_signature.subject_name : ( "Microsoft Corporation", "Microsoft 3rd Party Application Component" ) and process.code_signature.trusted == true ) or ( (process.name : "taskkill.exe" and process.args : "Teams.exe") ) ) ) or /* Discord */ (process.parent.name : "Discord.exe" and not ( ( process.executable : ( "?:\\Program Files\\*", "?:\\Program Files (x86)\\*", "?:\\Users\\*\\AppData\\Local\\Google\\Chrome\\Application\\chrome.exe", "?:\\Windows\\System32\\reg.exe", "?:\\Windows\\SysWOW64\\reg.exe", "?:\\Windows\\System32\\WerFault.exe", "?:\\Windows\\SysWOW64\\WerFault.exe" ) and process.code_signature.trusted == true ) or ( process.code_signature.subject_name : ( "Discord Inc." ) and process.code_signature.trusted == true ) or ( process.name : "cmd.exe" and ( process.command_line : ( "C:\\WINDOWS\\system32\\cmd.exe /d /s /c \"chcp\"", "C:\\WINDOWS\\system32\\cmd.exe /q /d /s /c \"C:\\Program^ Files\\NVIDIA^ Corporation\\NVSMI\\nvidia-smi.exe\"" ) or process.args : ( "C:\\WINDOWS/System32/nvidia-smi.exe", "C:\\WINDOWS\\System32\\nvidia-smi.exe", "C:\\Windows\\System32\\DriverStore\\FileRepository/*/nvidia-smi.exe*" ) ) ) ) ) or /* WhatsApp */ (process.parent.name : "Whatsapp.exe" and not ( ( process.executable : ( "?:\\Program Files\\*", "?:\\Program Files (x86)\\*", "?:\\Windows\\System32\\WerFault.exe", "?:\\Windows\\System32\\reg.exe", "?:\\Windows\\SysWOW64\\reg.exe" ) and process.code_signature.trusted == true ) or ( process.code_signature.subject_name : ( "WhatsApp LLC", "WhatsApp, Inc", "24803D75-212C-471A-BC57-9EF86AB91435" ) and process.code_signature.trusted == true ) or ( (process.name : "cmd.exe" and process.command_line : "C:\\Windows\\system32\\cmd.exe /d /s /c \"C:\\Windows\\system32\\wbem\\wmic.exe*") ) ) ) or /* Zoom */ (process.parent.name : "Zoom.exe" and not ( ( process.executable : ( "?:\\Program Files\\*", "?:\\Program Files (x86)\\*", "?:\\Users\\*\\AppData\\Local\\Google\\Chrome\\Application\\chrome.exe", "?:\\Users\\*\\AppData\\Local\\Island\\Island\\Application\\Island.exe", "?:\\Users\\*\\AppData\\Local\\Mozilla Firefox\\firefox.exe", "?:\\Windows\\System32\\WerFault.exe" ) and process.code_signature.trusted == true ) or ( process.code_signature.subject_name : ( "Zoom Video Communications, Inc." ) and process.code_signature.trusted == true ) ) ) or /* Outlook */ (process.parent.name : "outlook.exe" and not ( ( process.executable : ( "?:\\Program Files\\*", "?:\\Program Files (x86)\\*", "?:\\Windows\\System32\\WerFault.exe", "?:\\Windows\\SysWOW64\\WerFault.exe", "?:\\Windows\\system32\\wermgr.exe", "?:\\Users\\*\\AppData\\Local\\Microsoft\\Teams\\current\\Teams.exe", "?:\\Users\\*\\AppData\\Local\\Temp\\NewOutlookInstall\\NewOutlookInstaller.exe", "?:\\Users\\*\\AppData\\Local\\Google\\Chrome\\Application\\chrome.exe", "?:\\Users\\*\\AppData\\Local\\Island\\Island\\Application\\Island.exe", "?:\\Users\\*\\AppData\\Local\\Mozilla Firefox\\firefox.exe", "?:\\Users\\*\\AppData\\Roaming\\Zoom\\bin\\Zoom.exe", "?:\\Windows\\System32\\IME\\SHARED\\IMEWDBLD.EXE", "?:\\Windows\\System32\\spool\\drivers\\x64\\*", "?:\\Windows\\System32\\prevhost.exe", "?:\\Windows\\System32\\dwwin.exe", "?:\\Windows\\System32\\mspaint.exe", "?:\\Windows\\SysWOW64\\mspaint.exe", "?:\\Windows\\System32\\notepad.exe", "?:\\Windows\\SysWOW64\\notepad.exe", "?:\\Windows\\System32\\smartscreen.exe", "?:\\Windows\\explorer.exe", "?:\\Windows\\splwow64.exe" ) and process.code_signature.trusted == true ) or ( process.name : "rundll32.exe" and process.args : "*hpmsn???.dll,MonitorPrintJobStatus*" ) ) ) or /* Thunderbird */ (process.parent.name : "thunderbird.exe" and not ( ( process.executable : ( "?:\\Program Files\\*", "?:\\Program Files (x86)\\*", "?:\\Windows\\System32\\WerFault.exe", "?:\\Windows\\splwow64.exe" ) and process.code_signature.trusted == true ) or ( process.code_signature.subject_name : ( "Mozilla Corporation" ) and process.code_signature.trusted == true ) ) ) )
Framework: MITRE ATT&CKTM
-
Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
-
Technique:
- Name: Masquerading
- ID: T1036
- Reference URL: https://attack.mitre.org/techniques/T1036/
-
Sub-technique:
- Name: Invalid Code Signature
- ID: T1036.001
- Reference URL: https://attack.mitre.org/techniques/T1036/001/
-
Sub-technique:
- Name: Match Legitimate Name or Location
- ID: T1036.005
- Reference URL: https://attack.mitre.org/techniques/T1036/005/
-
Technique:
- Name: Process Injection
- ID: T1055
- Reference URL: https://attack.mitre.org/techniques/T1055/
-
Tactic:
- Name: Persistence
- ID: TA0003
- Reference URL: https://attack.mitre.org/tactics/TA0003/
-
Technique:
- Name: Compromise Host Software Binary
- ID: T1554
- Reference URL: https://attack.mitre.org/techniques/T1554/