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sigmamediumHunting

Suspicious Vsls-Agent Command With AgentExtensionPath Load

Detects Microsoft Visual Studio vsls-agent.exe lolbin execution with a suspicious library load using the --agentExtensionPath parameter

MITRE ATT&CK

T1218
defense-evasion

Detection Query

selection:
  Image|endswith: \vsls-agent.exe
  CommandLine|contains: --agentExtensionPath
filter:
  CommandLine|contains: Microsoft.VisualStudio.LiveShare.Agent.
condition: selection and not filter

Author

bohops

Created

2022-10-30

Data Sources

windowsProcess Creation Events

Platforms

windows

References

Tags

attack.defense-evasionattack.t1218
Raw Content
title: Suspicious Vsls-Agent Command With AgentExtensionPath Load
id: 43103702-5886-11ed-9b6a-0242ac120002
status: test
description: Detects Microsoft Visual Studio vsls-agent.exe lolbin execution with a suspicious library load using the --agentExtensionPath parameter
references:
    - https://twitter.com/bohops/status/1583916360404729857
author: bohops
date: 2022-10-30
tags:
    - attack.defense-evasion
    - attack.t1218
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith: '\vsls-agent.exe'
        CommandLine|contains: '--agentExtensionPath'
    filter:
        CommandLine|contains: 'Microsoft.VisualStudio.LiveShare.Agent.'
    condition: selection and not filter
falsepositives:
    - False positives depend on custom use of vsls-agent.exe
level: medium