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Nemty v2.5 Ransomware (.NEMTY_<7-Digit Random>)

  • Distribution Method : Mail attachment file
 
  • MD5 : 2416b9e5a966dff4e7383a24525526ec
 
  • Major Detection Name : Trojan.Ransom.Nemty (ALYac), Trojan.Win32.S.Nemty.199168 (ViRobot)
 
  • Encrypted File Pattern : .NEMTY_<7-Digit Random>
 
  • Malicious File Creation Location : C:\Users\%UserName%\NEMTY_<7-Digit Random>-DECRYPT.txt
 
  • Payment Instruction File : NEMTY_<7-Digit Random>-DECRYPT.txt
 
  • Major Characteristics :
     - Offline Encryption
     - Checking IP address (api.db-ip.com)
     - Block processes execution (excel.*, oracle.*, outlook.*, sql.*, thunderbird.*, winword.* etc.)
     - Stop multi services (AcronisAgent, AcrSch2Svc, Apache2.4, DbxSvc, OracleXETNSListener, OracleServiceXE etc.)
     - Disable system restore (vssadmin resize shadowstorage /for=<Drive Letter>: /on=<Drive Letter>: /maxsize=401MB, vssadmin resize shadowstorage /for=<Drive Letter>: /on=<Drive Letter>: /maxsize=unbounded, bcdedit /set {default} bootstatuspolicy ignoreallfailures, bcdedit /set {default} recoveryenabled no, wbadmin delete catalog -quiet, wmic shadowcopy delete, G e t - W m i O b j e c t   W i n 3 2 _ S h a d o w c o p y   |   F o r E a c h - O b j e c t   { $ _ . D e l e t e ( ) ; } )

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