Detecting Online Sandbox

Created the Wednesday 10 March 2021. Updated 7 months, 2 weeks 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


Featured Windows API's

Below, you will find a list of the most commonly used Windows API's that are currently utilized by malware authors for current evasion technique. This list is meant to provide an overview of the API's that are commonly used for this purpose. If there are any API's that you feel should be included on this list, please do not hesitate to contact us. We will be happy to update the list and provide any additional information or documentation that may be helpful.

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.

Sleeping Alien

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