Parasite ransomware targeting French users actively spreading in the wild

February 26, 2021

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

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

The ransomware targeting French speaking users and designed for very specific region.

Infection Cycle:

The ransomware adds the following files to the system:

  • Malware.exe
    • %App.path%\ [Filename]. Parasite

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

When Parasite 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:

txt ,doc ,docx ,xls ,xlsx ,ppt ,pptx ,odt ,jpeg ,png ,csv ,sql ,mdb ,sln ,php ,asp ,aspx ,html ,xml ,psd ,rar ,wma ,avi ,wmv ,d3dbsp ,zip ,sie ,sum ,ibank ,qdf ,gdb ,tax ,pkpass ,bkp ,qic ,bkf ,sidn ,sidd ,mddata ,itl ,itdb ,icxs ,hvpl ,hplg ,hkdb ,mdbackup ,syncdb ,gho ,cas ,svg ,map ,wmo ,itm ,fos ,mov ,vdf ,ztmp ,sis ,sid ,ncf ,menu ,layout ,dmp ,blob ,esm ,vcf ,vtf ,dazip ,fpk ,mlx ,iwd ,vpk ,tor ,psk ,rim ,fsh ,ntl ,arch00 ,lvl ,snx ,cfr ,vpp_pc ,lrf ,mcmeta ,vfs0 ,mpqge ,kdb ,dba ,rofl ,hkx ,bar ,upk ,das ,iwi ,litemod ,asset ,forge ,ltx ,bsa ,apk ,sav ,lbf ,slm ,bik ,epk ,rgss3a ,pak ,big ,wallet ,wotreplay ,xxx ,desc ,flv ,css ,pfx  ,wav ,bin ,conf ,ico ,jfif

The ransomware encrypts all the files and appends the [.Parasite] 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 for unlock instructions.

The ransomware shows different message for French speaking targets:

 

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

  • GAV: Parasite.RSM (Trojan)

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