New CryptoHost Ransomware Spotted in the Wild (Aug 23, 2016).


The Dell Sonicwall Threats Research team observed reports of a new Ransomware family Named CryptoHost [GAV: Filecoder.A_118] actively spreading in the wild.

The Malware encrypts all files on the victim’s machine with a password protected Rar archive.

Infection Cycle:

The Malware uses the following icons:

The Malware adds the following files to the system:

  • CryptoHost.exe

    • %Userprofile%Application Datacryptohost.exe

    • %Userprofile%Application Dataprocessor.exe

  • processor.exe

    • C:Documents.rar

The Trojan adds the following keys to the Windows registry to ensure persistence upon reboot:

  • HKCUSoftwareMicrosoftWindowsCurrentVersionRunsoftware

    • %Userprofile%Application Datacryptohost.exe

The Malware runs following commands on the system:

Once the computer is compromised, the malware copies its own executable file to %Userprofile% Application Data folder and creates another process named Processor.exe.

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

After encrypting all the personal documents and files it shows the following picture:

It demands that victims pay using Bitcoin in order to receive the decryption key that allows them to recover their files. The malware has some guidelines for how to purchase Bitcoins:

We have been monitoring varying hits over the past few days for the signature that blocks this threat:

SonicWALL Gateway AntiVirus provides protection against this threat via the following signature:

  • GAV: Filecoder.A_118 (Trojan)

Security News
The SonicWall Capture Labs Threat Research Team gathers, analyzes and vets cross-vector threat information from the SonicWall Capture Threat network, consisting of global devices and resources, including more than 1 million security sensors in nearly 200 countries and territories. The research team identifies, analyzes, and mitigates critical vulnerabilities and malware daily through in-depth research, which drives protection for all SonicWall customers. In addition to safeguarding networks globally, the research team supports the larger threat intelligence community by releasing weekly deep technical analyses of the most critical threats to small businesses, providing critical knowledge that defenders need to protect their networks.