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MrDec Ransomware (.[ID]<Random>[ID] / Decoder.hta)

  • Distribution Method : Unknown
 
  • MD5 : e41ee0a8ce9df50ba9bd31e12e149dbe
 
  • Major Detection Name : Ransom:Win32/Sherminator.YL (Microsoft), Ransom_Sherminator.R002C0DHI20 (Trend Micro)
 
  • Encrypted File Pattern : .[ID]<Random>[ID]
 
  • Malicious File Creation Location :
     - C:\Windows\delog.bat
     - C:\Windows\svhost.exe
     - C:\Decoder.hta
 
  • Payment Instruction File : Decoder.hta
 
  • Major Characteristics :
     - Offline Encryption
     - DXXD / LockCrypt Ransomware series
     - Encryption starts after killing all process except listed in whitelist processes.
     - Deletes event log (wevtutil.exe cl "Analytic", wevtutil.exe cl "Application", wevtutil.exe cl "Security", wevtutil.exe cl "Setup", wevtutil.exe cl "System" etc.)
     - Displays ransom note (C:\Windows\SysWow64\mshta.exe "c:\Decoder.hta") when user executes encrypted file (.[ID]<Random>[ID])

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