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P4T12ICK
70 lines
2.4 KiB
YAML
70 lines
2.4 KiB
YAML
name: Windows Rasautou DLL Execution
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id: 6f42b8be-8e96-11ec-ad5a-acde48001122
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version: 1
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date: '2022-02-15'
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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: The following analytic identifies the Windows Windows Remote Auto Dialer,
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rasautou.exe executing an arbitrary DLL. This technique is used to execute arbitrary
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shellcode or DLLs via the rasautou.exe LOLBin capability. During triage, review
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parent and child process behavior including file and image loads.
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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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CommandLine: '* -d *'
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Image|endswith: rasautou.exe
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selection2:
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CommandLine: '* -p *'
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condition: selection1 and selection2
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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: False positives will be limited to applications that require
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Rasautou.exe to load a DLL from disk. Filter as needed.
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references:
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- https://github.com/mandiant/DueDLLigence
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- https://github.com/MHaggis/notes/blob/master/utilities/Invoke-SPLDLLigence.ps1
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- https://gist.github.com/NickTyrer/c6043e4b302d5424f701f15baf136513
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- https://www.mandiant.com/resources/staying-hidden-on-the-endpoint-evading-detection-with-shellcode
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tags:
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analytic_story:
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- Windows Defense Evasion Tactics
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asset_type: Endpoint
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confidence: 100
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impact: 80
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message: An instance of $parent_process_name$ spawning $process_name$ was identified
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on endpoint $dest$ attempting to load a DLL in a suspicious manner.
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mitre_attack_id:
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- T1055.001
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- T1218
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- T1055
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observable:
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- name: dest
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type: Hostname
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role:
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- Victim
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- name: parent_process_name
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type: Process
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role:
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- Parent Process
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- name: process_name
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type: Process
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role:
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- Child Process
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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: 80
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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/T1055.001/rasautou/windows-sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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