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TROJ_BANDROP.ZIP

June 06, 2013
 Analysis by: Rhena Inocencio
 ALIASES:

TrojanProxy:BAT/Banker.G (Microsoft), Infostealer.Banprox (Symantec), RDN/PWS-Banker!bv (McAfee)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • 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:

Varies

File Type:

EXE

File Compression:

RAR SFX

Memory Resident:

No

Initial Samples Received Date:

09 May 2013

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.

It may be downloaded from the following remote site(s):

  • http://www.{BLOCKED}m.{BLOCKED}a.gov.br/images/AdobeFlashPlayer11.exe
  • http://www.{BLOCKED}m.{BLOCKED}a.gov.br/images/AdobeUpdate.exe
  • http://www.{BLOCKED}m.{BLOCKED}a.gov.br/images/AdobeUpgrade.exe
  • http://{BLOCKED}s.{BLOCKED}a.gov.br/wp-includes/UpdateFlashPlayer.exe
  • http://www.{BLOCKED}m.{BLOCKED}a.gov.br/images/FlashPlayerUpdate.exe
  • http://www.{BLOCKED}m.{BLOCKED}a.gov.br/images/AdobeFlashPlayerUpdate.exe
  • http://www.{BLOCKED}a.{BLOCKED}p.gov.br/download/gnre/gnre430.exe
  • http://{BLOCKED}s.{BLOCKED}a.gov.br/wp-includes/UpdateFlashPlayer.exe
  • http://www.{BLOCKED}m.{BLOCKED}a.gov.br/images/update.exe
  • http://{BLOCKED}s.{BLOCKED}a.gov.br/wp-content/uploads/AdobeUpgrade.exe
  • http://www.{BLOCKED}m.{BLOCKED}a.gov.br/images/2904.exe

Installation

This Trojan drops the following component file(s):

  • %User Temp%\enc.exe - Base64 encoder/decoder

(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 drops the following files:

  • %User Temp%\{filename 1} - detected as TSPY_BANKER.ZIP
  • %User Temp%\{filename 2} - detected as JAVA_BANKER.ZIP

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

NOTES:
{filename 1} can be any of the following:

  • defender_2013_1.exe
  • domzim-novo2.exe
  • ok29042013.exe
  • wind.exe
  • window.exe
  • wins.exe
  • winsss.exe

{filename 2} can be any of the following:
  • foto.gif
  • pic.gif

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.906.05

FIRST VSAPI PATTERN DATE:

09 May 2013

VSAPI OPR PATTERN File:

9.907.00

VSAPI OPR PATTERN Date:

09 May 2013

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

Remove the malware/grayware file dropped/downloaded by TROJ_BANDROP.ZIP

     
    • TSPY_BANKER.ZIP
    • JAVA_BANKER.ZIP

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%\enc.exe

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_BANDROP.ZIP. 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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