Whycry Ransomware Spotted in the Wild

June 15, 2017

The SonicWall Threats Research team observed reports of a new variant family of Whycry Ransomware [GAV: Whycry.RSM] actively spreading in the wild.

Whycry encrypts the victims files with a strong encryption algorithm until the victim pays a fee to get them back.

Infection Cycle:

Once the computer is compromised a fake Windows Update Screen will show up, to try and trick targets into leaving their PC running:

The Malware encrypts all personal documents and files it shows the following webpage:

The malware states that your files are encrypted and that you must pay $300 US dollars in the Bitcoin currency for potentially unlocking your files. Also, there is a threat that states that if you turn off your computer you will lose your files, but that threat it’s empty.

During our research we discovered the malware uses a master key for its own decryption:

SonicWall Gateway AntiVirus provides protection against this threat via the following signatures:

GAV: Whycry.RSM (Trojan)