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RANSOM_NOTOPEN.THIBGAH

October 18, 2018
 Analysis by: Arjun Bryan Baltazar
 ALIASES:

NAIRDN/Ransom (NAI) , Ransom:Win32/Genasom (Microsoft)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 INFORMATION EXPOSURE:

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware

This Ransomware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It deletes itself after execution.

It drops files as ransom note.

  TECHNICAL DETAILS

File Size:

215,040 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

25 Sep 2018

Payload:

Terminates processes, Deletes files, Displays message/message boxes

Arrival Details

This Ransomware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Process Termination

This Ransomware terminates the following processes if found running in the affected system's memory:

  • agntsvc.exe
  • dbsnmp.exe
  • fdhost.exe
  • fdlauncher.exe
  • MsDtsSrvr.exe
  • msftesql.exe
  • msmdsrv.exe.
  • mydesctopservice.exe
  • ntdbsmgr.exe
  • ocautoupds.exe
  • ocssd.exe
  • oracle.exe
  • pg_ctl.exe
  • postgres.exe
  • ReportingServecesService.exe
  • ReportingServicesService.exe
  • SQLAGENT.EXE
  • sqlagent.exe
  • sqlbrowser.exe
  • sqlceip.exe
  • sqlserv.exe
  • sqlservr.exe
  • sqlwriter.exe
  • Ssms.exe
  • synctime.exe
  • UniFi.exe

Other Details

This Ransomware does the following:

  • Terminate Services if found running in the affected system:
    • MsDtsServer100
    • MsDtsServer130
    • MSSQL
    • MSSQLFDLauncher
    • MSSQLSERVER
    • MSSQLServerADHelper100
    • MSSQLServerOLAPService
    • postgresql-x64-9.4
    • ReportServer
    • SQLAgent
    • SQLBrowser
    • SQLSERVERAGENT
    • SQLTELEMETRY
    • SQLWriter
    • SSISTELEMETRY130
    • storflt
    • TMBMServer
    • UniFi
    • vmicguestinterface
    • vmicheartbeat
    • vmickvpexchange
    • vmicrdv
    • vmicshutdown
    • vmictimesync
    • vmicvss
    • vmms
  • if string match It avoids encrypting files found in the following folders:
    • "C:\System Volume Information"
    • Windows
    • Roaming
  • It avoids encrypting files named:
    • {Malware File Name}
    • "!_HOW_RECOVERY_FILES_!.txt"
  • It appends the following extension to the file name of the encrypted files:
    • [{BLOCKED}n@countermail.com].NOT_OPEN
  • Deletes Shadow Copy
  • Encrypts All drive available

It deletes itself after execution.

Ransomware Routine

This Ransomware drops the following file(s) as ransom note:

  • {Encrypted Directory}\!_HOW_RECOVERY_FILES_!.txt

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

14.530.03

FIRST VSAPI PATTERN DATE:

27 Sep 2018

VSAPI OPR PATTERN File:

14.531.00

VSAPI OPR PATTERN Date:

28 Sep 2018

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Search and delete these files

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.  
  • {Encrpyted Directory}\!_HOW_RECOVERY_FILES_!.txt

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as RANSOM_NOTOPEN.THIBGAH. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.

Step 6

Restore encrypted files from backup.


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