Threat Level: green Handler on Duty: Didier Stevens

SANS ISC: CSAM: The Power of Virustotal to Turn Harmless Binaries Malicious - SANS Internet Storm Center SANS ISC InfoSec Forums

Sign Up for Free!   Forgot Password?
Log In or Sign Up for Free!
CSAM: The Power of Virustotal to Turn Harmless Binaries Malicious

We all know that anti virus, the necessary evil of basic computer security, isn't a stranger to false positives. So no big surprise here when John is writing that he ran into such a false positive during an incident response:

I was scanning a forensic drive image with clamav and scored a positive hit on a file.

Great. ClamAV, a free anti-virus product. Of course, we don't trust it. So John did what most of use would have done, and submitted the suspect binary to Virustotal:

Virustotal showed 14 out of other 50 AV vendors' products thought it was malware as well.

Ouch! 14 out of 50? Many actual malware samples I submit get a lower rate then that. Turns out the binary in question was a desktop management software, "lunchwrapper.exe", and the AV tools picked up on it's file download component (the famous "generic downloader" signatures).

But you think this is bad? Listen what happened next according to John:

The scary part was that after I submitted the sample, other major AV vendors decided that the submitted sample was malicious and our endpoint software starting quarantining the program after the AV dats had updated.

After all, as my fellow developer can attest?too: The reason we allow people to use our applications is so that we don't have to do any testing ourselves.

(BTW: Virustotal/Google are doing great work, and I think it is a good thing that they are distributing samples. The problem is how AV vendors use this information.)

Johannes B. Ullrich, Ph.D.

I will be teaching next: Intrusion Detection In-Depth - SIEM Summit & Training 2019


3631 Posts
ISC Handler

Sign Up for Free or Log In to start participating in the conversation!