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Why does the manual malware analysis not scale well, what can be doen?
Malware analysis can be very time consuming and expensive. Shortage of skilled analysts and an abundant number of malware samples does not scale well
Solution: Analysis automation
AV vendors and threat intelligence companies automatically process and analyze feeds of 100'000s of malware samples per day to generate, better av signatures IOCs or threat intelligence.
What are malware sandboxes and what are they used for?
Malware sandboxes automate malware (binaries, documents, URLs) analysis, and typically allow to quickly:
Malsware sandboxes are dynamic analysis systems:
How can dynamic analysis techniques be defeated by malware (Anti analysis)
what is the differnce of PE files on disk vs. in memory, and what are the implications of that?
In general it is impossible to recontruct the original PE file from memory since some modifications cannot be undone:
Don't expect the recovered PE files to be runnable
Recovered PE files are sufficent for analysis with IDA Pro or to upload to Virustotal.
Malware sometimes modifies /destructs the PE header in memory to make reconstruction hard/impossible
PE files in memory contains more information than PE files on disk:
What is packing and why is it done by malware?
Packing is an ovfuscation technique used by malware, with two goals:
How can you unpack malware?
To unpack malware it is often sufficient to dump memory of the unpacked process, recieving memory injections.
What volatility commands can be used for memory extraction?
General limitation: Memory that is paged out cannot be dumped, which can result in corruption when dumping PE files
What can virustotal be used for?
we can upload dll and executables that we extracted with dlldump and procdump to malfind for automatic analysis.
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