Trojan.Win32.CVE20151701.E

March 08, 2019
 Analysis by: Warren Adam Sto. Tomas
 PLATFORM:

Windows

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

  • Threat Type: Exploit

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware, Downloaded from the Internet

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

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

It takes advantage of certain vulnerabilities.

  TECHNICAL DETAILS

File Size:

78848 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

25 Feb 2019

Payload:

Connects to URLs/IPs, Exploits vulnerability

Arrival Details

This Exploit 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 Exploit creates the following folders:

  • %All Users Profile%\update

(Note: %All Users Profile% is the common user's profile folder, which is usually C:\Documents and Settings\All Users on Windows 2000, XP, and Server 2003, or C:\ProgramData on Windows Vista, 7, and 8. )

Download Routine

This Exploit connects to the following website(s) to download and execute a malicious file:

  • http://{BLOCKED}c.org/data/file/news/thumb-403720952_ra2zF2Ew_32_600x399.jpg

It saves the files it downloads using the following names:

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

Other Details

This Exploit does the following:

  • It checks for the presence of the following processes in the affected system:
    • V3Tray.exe
    • AYAgent.aye
    • navapsvc.exe
    • ashServ.exe
    • avgemc.exe
    • bdagent.exe
    • ZhuDongFangYu.exe
  • If it finds any of the processes above it will connect to the following website to download a file:
    • http://{BLOCKED}c.org/bbs/scrap_popup.php?category3=init
  • The file downloaded is saved as:
    • {malware directory}\scrap.txt
  • However, as of this writing, the said site is inaccessible

It takes advantage of the following vulnerabilities:

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

14.836.05

FIRST VSAPI PATTERN DATE:

25 Feb 2019

VSAPI OPR PATTERN File:

14.837.00

VSAPI OPR PATTERN Date:

26 Feb 2019

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 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.  
  • %All Users Profile%\update\Windows-RT-KB2937636.dll
  • {malware directory}\scrap.txt

Step 4

Scan your computer with your Trend Micro product to delete files detected as Trojan.Win32.CVE20151701.E. 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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