Question 1

How does drltrace compare to traditional API hooking tools?

Accepted Answer

Drltrace uses dynamic binary instrumentation via DynamoRIO, making it harder for malware to detect compared to API hooking, which is often flagged by anti-research techniques. However, it may have higher performance overhead and requires more setup than hooking-based tools.

Question 2

How to install drltrace on Linux for tracing executables?

Accepted Answer

Download the release build from GitHub or build from source using the provided wiki instructions, which involve compiling with DynamoRIO. Then, run it from the command line with options like -logdir and the target process name for basic tracing.

Question 3

Can drltrace trace API calls from code injected into remote processes?

Accepted Answer

Currently, drltrace does not fully support remote code injection scenarios; the README notes that using DynamoRIO's -syswide_on option can help, but dedicated support is planned for future work. This limits analysis of malware that uses process injection techniques.

Question 4

Is drltrace really undetectable by all malware?

Accepted Answer

While designed to avoid common anti-hooking and anti-debugging tricks, the README acknowledges that DBI itself can be detected by advanced malware, as cited in research papers. So, it's transparent but not foolproof against all detection methods.

Question 5

What performance impact does drltrace have on traced applications?

Accepted Answer

Drltrace adds overhead due to dynamic binary instrumentation, which can slow down execution, especially for CPU-intensive processes. The README claims it's 'fast enough' for malware analysis, but users should expect some performance degradation compared to native execution.

Question 6

How to filter out noise in drltrace logs for specific malware analysis?

Accepted Answer

Use the -only_from_app flag to focus on calls from the main module, or create a filter.config file to whitelist or blacklist specific functions. This helps reduce log size and highlight relevant API calls, as described in the usage section.

drltrace

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