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Detects the use of MeshAgent to execute commands on the target host, particularly when threat actors might abuse it to execute commands directly. MeshAgent can execute commands on the target host by leveraging win-console to obscure their activities and win-dispatcher to run malicious code through IPC with child processes.
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Action1 is a powerful Remote Monitoring and Management tool that enables users to execute commands, scripts, and binaries. Through the web interface of action1, the administrator must create a new policy or an app to establish remote execution and then points that the agent is installed. Hunting Opportunity 1- Weed Out The Noise --- When threat actors execute a script, a command, or a binary through these new policies and apps, the names of these become visible in the command line during the execution process. Below is an example of the command line that contains the deployment of a binary through a policy with name "test_app_1": ParentCommandLine: "C:\WINDOWS\Action1\action1_agent.exe schedule:Deploy_App__test_app_1_1681327673425 runaction:0"
After establishing a baseline, we can split the command to extract the policy name and group all the policy names and inspect the results with a list of frequency occurrences. An example query of this in Splunk could be: Index="
" source=" " Image="*\action1_agent.exe" ParentCommandLine="runaction:0" | rex field=ParentCommandLine "(?<=Deploy_App__)(? . (?=(_1)))"Hunting Opportunity 2 - Remote Sessions On Out Of Office Hours ---- If you have admins within your environment using remote sessions to administer endpoints, you can create a threat-hunting query and modify the time of the initiated sessions looking for abnormal activity.
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MOVEit is affected by a critical vulnerability. Exploited hosts show evidence of dynamically compliling a DLL and writing it under C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\([a-z0-9]{5,12})\([a-z0-9]{5,12})\App_Web_[a-z0-9]{5,12}.dll. Hunting Opportunity --- Events from IIS dynamically compiling binaries via the csc.exe on behalf of the MOVEit application, especially since May 27th should be investigated.
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