Techniques for automatically determining whether malware samples are similar are disclosed. In some embodiments, a system, process, and/or computer program product for automatically determining whether malware samples are similar includes receiving a plurality of samples for performing automated malware analysis to generate log files based on the automated malware analysis; comparing the log files based on the automated malware analysis; determining whether any of the plurality of samples are similar based on the comparison of the log files based on the automated malware analysis; and performing an action based on determining that at least two samples are similar.