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Trojan.W97M.CVE201711882.DVF

January 13, 2020
 ALIASES:

TrojanDownloader:O97M/Obfuse!MTB (Microsoft); I/O Error (McAfee); HEUR:Trojan-Downloader.VBS.Agent.gen (Kaspersky)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


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

  TECHNICAL DETAILS

File Size:

231,933 bytes

File Type:

RTF

Memory Resident:

Yes

Initial Samples Received Date:

13 Jan 2020

Arrival Details

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

Dropping Routine

This Trojan drops the following files:

  • %Application Data%\Microsoft\UProof\ExcludeDictionaryEN0409.lex
  • %User Temp%\Abctfhghghghgh\xc5\xa0.scT
  • %Application Data%\Microsoft\UProof\CUSTOM.DIC
  • {malware file path and name}
  • %All Users Profile%\hrjytrj.cmd

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %All Users Profile% is the common user's profile folder, which is usually C:\Documents and Settings\All Users on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit). )

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}ycre.com/kn/freak.exe

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.850

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 2

Search and delete these components

[ Learn More ]
There may be some components 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.
  • %Application Data%\Microsoft\UProof\ExcludeDictionaryEN0409.lex
  • %User Temp%\Abctfhghghghgh\xc5\xa0.scT
  • %Application Data%\Microsoft\UProof\CUSTOM.DIC
  • {malware file path and name}
  • %All Users Profile%\hrjytrj.cmd

Step 3

Scan your computer with your Trend Micro product to delete files detected as Trojan.W97M.CVE201711882.DVF. 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 the following Trend Micro Support pages for more information:


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