Detecting Online Sandbox

Created the Wednesday 10 March 2021. Updated 1 year, 10 months ago.

Online sandbox has become very popular for malware analysis. Several malware authors employ such techniques to avoid detection and analysis. Some of these techniques will be summarized here.

  • Any.Run uses a fake root certificate to spy on sandbox traffic. The first information about the system can be obtained by querying the information of the root certificate. In addition, the QEMU Agent is modified and used to monitor the applications running in the virtual machine allowing the sandbox to do API hooking and monitor the analyzed process. If a process name such as "srvpost.exe" is running and the "winanr.dll", "winsanr.dll" libraries are loaded, it is possible to detect the Any.Run agent.

  • Any.Run offers many packages to their users. And in addition to the features they are offering in these packages, they also determine the maximum number of minutes for active analysis. For example, you can analyze a file for 5 minutes by default with the Searcher package, that you pay 90 dollars to acquire, and you can make this time a maximum of 10 minutes by adding time in interactive mode. The sechost.dll in the agent contains and transmits the timing metrics of ANY.RUN. When we suspend this thread, Any.Run stops its counter and the analysis continues until it drops to timeout.


Technique Identifier

U1338


Code Snippets

Additional Resources

External Links

The resources provided below are associated links that will give you even more detailed information and research on current evasion technique. It is important to note that, while these resources may be helpful, it is important to exercise caution when following external links. As always, be careful when clicking on links from unknown sources, as they may lead to malicious content.

Subscribe to our Newsletter


The information entered into this form is mandatory. It will be subjected to computer processing. It is processed by computer in order to support our users and readers. The recipients of the data will be : contact@unprotect.it.

According to the Data Protection Act of January 6th, 1978, you have at any time, a right of access to and rectification of all of your personal data. If you wish to exercise this right and gain access to your personal data, please write to Thomas Roccia at contact@unprotect.it.

You may also oppose, for legitimate reasons, the processing of your personal data.