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New Section: TODO for 09.05.23, and add more questions.

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Sebastian Lenzlinger 2023-05-09 21:32:36 +02:00
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@ -20,4 +20,13 @@ Possible flow if it is clearly a user program:
For either path this cannot be the final functionality. It is unclear what is and isn't feasible at this point.
#### Open Questions:
1. What is the main difference between a user space keylogger (operating as root) and a keyloger which initself is a kernel module? What are the essential differences, and is ti really feasible to implement a kernel module that detects malicious kernel activity? Would't we loose usefull abstractions like /dev/ipnut/event* etc. which make it easier to track where I/O goes?
2.
2. What datastructures would a kernel keylogger even use, if it is not storeing the info in user space ( a log file say). Furthermore, how would it send the info via network? How would we be able to uncover such a datastructure and make it available to a system admin.
3. How would a kernel keylogger send smth over the network, without any user space component being able to see that (aka not even an admin)?
4. What artifacts besides kernel logs does a kernel module produce. Are any visible in userspace?
5. Would it be possible to expose kernel datastructures to userface without comprimising security?
6. Maybe the app/module is only to be run once as a scan, then one removes the malicous software component, and then returns the OS to a safe state without leakage to user space...
7. Do this questions assume the right underlying model of the linux kernel?
...? more certainly ...
#### TODOs:
1. Install both keyloggers in a VM and see how their functionality works, and how we would detect them using system programs. This especially applies to the user space keylogger.
2. Really need to figure out where the effect of kernel module would be seen. If its just logging to a logfile then it's basically as good as a user space program and a system admin could find it.