Trusted Developer Utilities Proxy Execution
Adversaries may take advantage of trusted developer utilities to proxy execution of malicious payloads. There are many utilities used for software development related tasks that can be used to execute code in various forms to assist in development, debugging, and reverse engineering.(Citation: engima0x3 DNX Bypass)(Citation: engima0x3 RCSI Bypass)(Citation: Exploit Monday WinDbg)(Citation: LOLBAS Tracker) These utilities may often be signed with legitimate certificates that allow them to execute on a system and proxy execution of malicious code through a trusted process that effectively bypasses application control solutions.
Mitigations |
|
| Mitigation | Description |
|---|---|
| Execution Prevention |
Block execution of code on a system through application control, and/or script blocking. |
| Disable or Remove Feature or Program |
Remove or deny access to unnecessary and potentially vulnerable software to prevent abuse by adversaries. |
Detection
Monitor for abnormal presence of these or other utilities that enable proxy execution that are typically used for development, debugging, and reverse engineering on a system that is not used for these purposes may be suspicious. Use process monitoring to monitor the execution and arguments of from developer utilities that may be abused. Compare recent invocations of those binaries with prior history of known good arguments and executed binaries to determine anomalous and potentially adversarial activity. It is likely that these utilities will be used by software developers or for other software development related tasks, so if it exists and is used outside of that context, then the event may be suspicious. Command arguments used before and after invocation of the utilities may also be useful in determining the origin and purpose of the binary being executed.
References
- Nelson, M. (2017, November 17). Bypassing Application Whitelisting By Using dnx.exe. Retrieved May 25, 2017.
- Nelson, M. (2016, November 21). Bypassing Application Whitelisting By Using rcsi.exe. Retrieved May 26, 2017.
- LOLBAS. (n.d.). Tracker.exe. Retrieved July 31, 2019.
- Graeber, M. (2016, August 15). Bypassing Application Whitelisting by using WinDbg/CDB as a Shellcode Runner. Retrieved May 26, 2017.
Связанные риски
Каталоги
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