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TROJ_DROPPR.FAP

September 22, 2014
 Analysis by: Vincent Martin Hermosura
 ALIASES:

Trojan:Win32/Dynamer!ac (Microsoft), Trojan.ADH.2 (Symmantec), RDN/Generic.dx!d2x (Mcafee), Trojan.Win32.Generic!BT (Sunbelt), TR/Kazy.418195.1 (Antivir), MSIL/Kryptik.VA!tr (Fortinet), Trojan.MSIL.Kryptik, Trojan.MSIL.Kryptik (Ikarus), a variant of MSIL/Kryptik.VA trojan, a variant of MSIL/Kryptik.VA trojan (Esset)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware


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.

It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

  TECHNICAL DETAILS

File Size:

164,596 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

16 Sep 2014

Payload:

Drops files

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 and executes the following files:

  • %User Temp%\vx.exe - detected as TROJ_BLBINDI.NSU

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

Dropping Routine

This Trojan executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

  SOLUTION

Minimum Scan Engine:

9.700

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.  
  • %User Temp%\vx.exe - detected as TROJ_BLBINDI.NSU

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_DROPPR.FAP. 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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