Analysis by: Mark Joseph Manahan
 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:
 INFORMATION EXPOSURE:

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This backdoor 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: 288,256 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 25 Feb 2014

Arrival Details

This backdoor 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 backdoor drops the following files:

  • %Windows%\Tasks\{random}.job

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

It drops the following copies of itself into the affected system:

  • %User Profile%\Application Data\Microsoft\{random}\{random}.exe

(Note: %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.)

It creates the following folders:

  • %User Profile%\Application Data\Microsoft\{random}

(Note: %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.)

Other Details

This backdoor connects to the following possibly malicious URL:

  • {BLOCKED}auskmt.pw
  • {BLOCKED}theusas.org
  • {BLOCKED}cmasn.net
  • {BLOCKED}skdfasjdmtf.org
  • {BLOCKED}psgrn.com
  • {BLOCKED}tmaksjdo.net
  • {BLOCKED}aqmi.net
  • {BLOCKED}akyat.org
  • {BLOCKED}hatdfsaf.net
  • {BLOCKED}geyaihudmn.org
  • {BLOCKED}ukahdmansgip.org
  • {BLOCKED}fdnaetra.net
  • http://{BLOCKED}oasset.{BLOCKED}ite.net/Repository/CampaignCreative/Campaign_16474/INSTREAMAD/KRWT0565H_Chili_Pot_Non-New.flv
  • {BLOCKED}.{BLOCKED}.135.19:8080
  • ajax.{BLOCKED}izzade.com

  SOLUTION

Minimum Scan Engine: 9.700
FIRST VSAPI PATTERN FILE: 10.628.06
FIRST VSAPI PATTERN DATE: 25 Feb 2014

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

Scan your computer with your Trend Micro product and note files detected as BKDR_QBOT.DHC

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Search and delete this folder

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.  
  • %User Profile%\Application Data\Microsoft\{random}

Step 5

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