BKDR_BIFROSE.FUU

July 10, 2013
 Modified by: Alvin Bacani
 ALIASES:

Backdoor:Win32/Bifrose.IQ (Microsoft); Backdoor.Bifrose (Symantec)

 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: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • 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. However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

151,417 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

09 Jul 2013

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.

However, as of this writing, the said sites are inaccessible.

Installation

This backdoor drops the following copies of itself into the affected system:

  • %System Root%\Setup\CacheMgr.exe

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

It creates the following folders:

  • %System Root%\Setup

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

Autostart Technique

This backdoor adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\2CBE016A-8F28-4E0C-83A6-6079161294D7
StubPath = ""%System Root%\Setup\CacheMgr.exe" -ax"

Download Routine

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

  • http://{BLOCKED}secure.net/ABIUSP/setup.exe

Other Details

This backdoor connects to the following possibly malicious URL:

  • {BLOCKED}.{BLOCKED}.224.112 via port 80
  • {BLOCKED}.{BLOCKED}.224.113 via port 80
  • {BLOCKED}.{BLOCKED}.224.114 via port 80
  • {BLOCKED}.{BLOCKED}.224.115 via port 80
  • {BLOCKED}.{BLOCKED}.224.116 via port 80
  • {BLOCKED}.{BLOCKED}.197.32 via port 80
  • {BLOCKED}.{BLOCKED}.232.182 via port 80
  • {BLOCKED}.{BLOCKED}.38.1 via port 80
  • {BLOCKED}.{BLOCKED}.219.25 via port 80

  SOLUTION

Minimum Scan Engine:

9.300

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 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.
  • %SystemRoot%\Setup

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.
  • %System Root%\Setup\CacheMgr.exe

Step 4

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\2CBE016A-8F28-4E0C-83A6-6079161294D7
    • StubPath = ""%System Root%\Setup\CacheMgr.exe" -ax"

Step 5

Scan your computer with your Trend Micro product to delete files detected as BKDR_BIFROSE.FUU. 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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