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Threat Encyclopedia

TROJ_BANKER.JBR

ANALYSIS BY

Jaime Benigno Reyes


ALIASES:

Trojan-Banker.Win32.Banker.bpfl (Kaspersky), Trj/Banker.KEZ (Panda)

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


This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It 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. As of this writing, the said sites are inaccessible.

TECHNICAL DETAILS

File Size:

1,473,344 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

06 Feb 2013

Payload:

Connects to URLs/IPs

Arrival Details

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

It 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 non-malicious file:

  • %Windows%\Win_pwr.pdf

(Note: %Windows% is the Windows folder, which is usually C:\Windows.)

Download Routine

This Trojan accesses the following websites to download files:

  • https://som.{BLOCKED}e.com/h-s-internal/20130128/f3487f359b38436f
  • https://som.{BLOCKED}e.com/h-s-internal/20130128/d3669545621045d9

It saves the files it downloads using the following names:

  • %Windows%\WIDEAWAKE1.zip
  • %Windows%\WIDEAWAKE3.zip

(Note: %Windows% is the Windows folder, which is usually C:\Windows.)

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

As of this writing, the said sites are inaccessible.

NOTES:

This Trojan is signed with a real and valid digital certificate issued by DigiCert to trick users into thinking that it is legitimate.

SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.712.01

FIRST VSAPI PATTERN DATE:

07 Feb 2013

VSAPI OPR PATTERN File:

9.713.00

VSAPI OPR PATTERN Date:

08 Feb 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

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.
  • %Windows%\Win_pwr.pdf
  • %Windows%\WIDEAWAKE1.zip
  • %Windows%\WIDEAWAKE3.zip

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_BANKER.JBR. 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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