Zeppelin ransomware also known as Vega or VegaLocker or Buran, observed at the beginning of 2019 and it was distributed as part of the financial malware. The ransomware was distributed through spam campaigns, downloaders, software cracking tools, and fake updates.
The ransomware was compiled in Delphi and it is a new member of Ransomware-as-a-Service (RaaS) family, the binaries are signed with the valid code signing certificates.
Researchers from Cylance observed a new targeted Zeppelin ransomware campaign that targets IT and healthcare companies in Europe and the U.S.
The ransomware appears highly configurable, they can be deployed as EXE, DLL, or wrapped in a PowerShell loader and the executables have three layers of obfuscation.
Zeppelin Ransomware includes following functions
On the infected machine, it creates an empty file with the “.zeppelin” extension in the %TEMP% directory and then copies itself to the %APPDATA% folder and it ensures persistence by setting up key in the registry.
Researchers observed that the “encryption algorithm has not changed substantially compared to previous versions of Buran.” For symmetric file encryption, it uses AES-256 in CBC mode and to protect the session keys it uses custom RSA implementation.
The ransomware uses to encrypt files present in all the drives except system files and network shares. Once the files encrypted it adds a random extension (“.126-D7C-E67”) to the encrypted files.
After encrypting all the files in the drive Zeppelin drops a ransom note text file, which asks users to purchase a unique private key to unlock the files.
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