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Nemty v1.6 Ransomware (._NEMTY_<7-Digit Random>_)

  • Distribution Method : Mail attachment file
 
  • MD5 : 06a28702d2b3d45a8ae80ced6f05cf25
 
  • Major Detection Name : Trojan.Ransom.Nemty (ALYac), Troj/Nemty-D (Sophos)
 
  • Encrypted File Pattern : ._NEMTY_<7-Digit Random>_
 
  • Malicious File Creation Location :
     - C:\Users\%UserName%\AdobeUpdate.exe
     - 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.*, onenote.*, oracle.*, outlook.*, sql.*, thunderbird.* etc.)
     - Stop multi services (AcronisAgent, AcrSch2Svc, Apache2.4, DbxSvc, OracleServiceXE, OracleXETNSListener etc.)
     - Disable system restore (vssadmin.exe delete shadows /all /quiet, 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)

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