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TROJ_DROPPER.XXTWP

September 21, 2017
 Analysis by: John Anthony Banes
 ALIASES:

Exploit.MSOffice.CVE-2017-8759.a (Kaspersky); Exploit:Win32/CVE-2017-8759.A (Microsoft); Exploit.CVE-2017-8759.Gen (BitDefender)

 PLATFORM:

Windows

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

  • 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:

63,728 bytes

File Type:

RTF

Memory Resident:

No

Initial Samples Received Date:

15 Sep 2017

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.

Installation

This Trojan drops the following files:

  • %User Temp%\RES{random characters}.tmp
  • %User Temp%\{random characters}.out
  • %User Temp%\{random characters}.err
  • %User Temp%\{random characters}.cmdline
  • %User Temp%\{random characters}.0.cs
  • %User Temp%\{random characters}.tmp
  • %User Profile%\Logo.cs
  • %User Profile%\http1008941842741590img4db.pdb
  • %User Profile%\http1008941842741590img4db.dll
  • %User Profile%\CSC{random characters}.tmp
  • %System%\Com\SOAPAssembly\Logo.cs
  • %System%\Com\SOAPAssembly\http1008941842741590img4db.pdb
  • %System%\Com\SOAPAssembly\http1008941842741590img4db.dll
  • %System%\Com\SOAPAssembly\CSC{random characters}.tmp

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}.{BLOCKED}.27.159/img.db
  • http://{BLOCKED}.{BLOCKED}.27.159:8080/lK0RS

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.660.05

FIRST VSAPI PATTERN DATE:

15 Sep 2017

VSAPI OPR PATTERN File:

13.661.00

VSAPI OPR PATTERN Date:

16 Sep 2017

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

Search and delete this file

[ 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.  
  • %User Temp%\RES{random characters}.tmp
  • %User Temp%\{random characters}.out
  • %User Temp%\{random characters}.err
  • %User Temp%\{random characters}.cmdline
  • %User Temp%\{random characters}.0.cs
  • %User Temp%\{random characters}.tmp
  • %User Profile%\Logo.cs
  • %User Profile%\http1008941842741590img4db.pdb
  • %User Profile%\http1008941842741590img4db.dll
  • %User Profile%\CSC{random characters}.tmp
  • %System%\Com\SOAPAssembly\Logo.cs
  • %System%\Com\SOAPAssembly\http1008941842741590img4db.pdb
  • %System%\Com\SOAPAssembly\http1008941842741590img4db.dll
  • %System%\Com\SOAPAssembly\CSC{random characters}.tmp

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_DROPPER.XXTWP. 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.


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