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BKDR_DELF.NXF

June 25, 2013
 ALIASES:

Backdoor:Win32/Blackhole.U (Microsoft); BackDoor-CGX (McAfee); Backdoor.Graybird (Symantec); Backdoor.Win32.Singu.bd (Kaspersky); FraudTool.Win32.MSRemovalTool.ek!a (v) (Sunbelt); Backdoor.Agent.ZSG (FSecure)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • 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:

363,008 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

09 Jun 2012

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 copies of itself into the affected system:

  • %System%\brc_Server.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

Other System Modifications

This backdoor deletes the following files:

  • %System%\brc_Server.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

Dropping Routine

This backdoor drops the following files:

  • %System%\brc_Server.dat

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.200

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 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%\brc_Server.dat

Step 3

Scan your computer with your Trend Micro product to delete files detected as BKDR_DELF.NXF. 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.

Step 4

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • %System%\brc_Server.exe


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