Babuk ransomware actively spreading in the wild

The SonicWall Capture Labs Threat Research team observed reports of a new variant family of Babuk ransomware actively spreading in the wild.

The Babuk ransomware encrypts the victim’s files with a strong encryption algorithm until the victim pays a fee to get them back.

Infection Cycle:

The ransomware adds the following files to the system:

• Malware.exe
  • %App.path%\ How To Restore Your Files.txt
  • %App.path%\ [__NIST_K571__]

Once the computer is compromised, the ransomware runs the following commands:

When Babuk is started it will create and assign a unique ID number to the victim then scan all local drives for data files to encrypt.

When encrypting files it will use the AES encryption algorithm and only encrypt those files that match the following extensions:

jpe, jpg, kdc, mdb, mdf, nef, crt, crw, dbf, dcr, der, dng, doc, docm, docx, xls, xlsb, xlsm, xlsx, pef, pem, pfx, ppt, pptm, pptx, psd, raf, raw, rtf.

The ransomware encrypts all the files and appends the [__NIST_K571__] extension onto each encrypted file’s

filename.

After encrypting all personal documents, the ransomware shows the following text file containing a message reporting that the computer has been encrypted and to contact its developer ( website ) for unlock instructions.

Screenshots from the ransomware website:

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

SonicWall Capture Labs provides protection against this threat via the following signature:

• GAV: Blackheart.RSM (Trojan)

This threat is also detected by SonicWALL Capture ATP w/RTDMI and the Capture Client endpoint solutions.

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.