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P4T12ICK
75 lines
2.7 KiB
YAML
75 lines
2.7 KiB
YAML
name: Nishang PowershellTCPOneLine
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id: 1a382c6c-7c2e-11eb-ac69-acde48001122
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version: 2
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date: '2021-03-03'
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author: Michael Haag, Splunk
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status: production
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type: TTP
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description: This query detects the Nishang Invoke-PowerShellTCPOneLine utility that
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spawns a call back to a remote Command And Control server. This is a powershell
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oneliner. In addition, this will capture on the command-line additional utilities
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used by Nishang. Triage the endpoint and identify any parallel processes that look
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suspicious. Review the reputation of the remote IP or domain contacted by the powershell
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process.
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data_source:
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- Sysmon Event ID 1
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search:
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selection1:
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OriginalFileName: pwsh.dll
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selection2:
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Image|endswith:
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- pwsh.exe
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- sqlps.exe
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- sqltoolsps.exe
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- powershell.exe
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- powershell_ise.exe
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selection3:
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OriginalFileName: PowerShell.EXE
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selection4:
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OriginalFileName: powershell_ise.EXE
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selection5:
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CommandLine: '*System.Text.ASCIIEncoding*'
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selection6:
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CommandLine: '*Net.Sockets.TCPClient*'
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condition: (selection1 or selection2 or selection3 or selection4) and selection5
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and selection6
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how_to_implement: To successfully implement this search you need to be ingesting information
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on process that include the name of the process responsible for the changes from
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your endpoints into the `Endpoint` datamodel in the `Processes` node. In addition,
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confirm the latest CIM App 4.20 or higher is installed and the latest TA for the
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endpoint product.
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known_false_positives: Limited false positives may be present. Filter as needed based
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on initial analysis.
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references:
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- https://github.com/samratashok/nishang/blob/master/Shells/Invoke-PowerShellTcpOneLine.ps1
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- https://www.volexity.com/blog/2021/03/02/active-exploitation-of-microsoft-exchange-zero-day-vulnerabilities/
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- https://www.microsoft.com/security/blog/2021/03/02/hafnium-targeting-exchange-servers/
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- https://www.rapid7.com/blog/post/2021/03/03/rapid7s-insightidr-enables-detection-and-response-to-microsoft-exchange-0-day/
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tags:
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analytic_story:
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- HAFNIUM Group
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asset_type: Endpoint
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confidence: 60
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impact: 70
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message: Possible Nishang Invoke-PowerShellTCPOneLine behavior on $dest$
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mitre_attack_id:
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- T1059
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- T1059.001
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observable:
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- name: dest
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type: Endpoint
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role:
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- Victim
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product:
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- Splunk Enterprise
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- Splunk Enterprise Security
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- Splunk Cloud
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risk_score: 42
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security_domain: endpoint
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tests:
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- name: True Positive Test
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attack_data:
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- data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1059.001/atomic_red_team/windows-sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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