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Shmuel Zeigerman wrote:
Custom malware can be difficult to detect, but Kaspersky is fairly good at it; I'd stick with earlier suggestions to ask for the source or run virtualized. Better safe than sorry.Update: scanning the mentioned zip-file online with 21 antivirus programs (http://virusscan.jotti.org/): 3 programs (AVG, F-Secure Anti-Virus and Kaspersky Anti-Virus) found malware, other 18 programs found nothing. [don't know how to interpret the above results...]
Ordinarily I'd also suggest auditing the code's DLL imports with a disassembler, but that's time-consuming, more difficult, and not foolproof at all (unless you're extremely good at assembly), not to mention that it probably won't help for a DLL that interfaces so much with the Windows API like this one.
-- Irayo