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: 32,768 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 19 Dec 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.

Installation

This backdoor creates the following folders:

  • %User Profile%\Application Data\B558A7CE
  • %System%\B558A7CE

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

Other System Modifications

This backdoor deletes the following files:

  • %Application Data%\53812.tmp
  • %Application Data%\53843.tmp

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)

It adds the following registry keys:

HKEY_CURRENT_USER\Software\AdobeSoft

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Recovery

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
ZoneMap\Domains\ssl.projectscorp.net

It adds the following registry entries:

HKEY_CURRENT_USER\Software\AdobeSoft
IMJPMIG8.1B55 = "%User Profile%\B558A7CE\msdtc.exe /Start"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Recovery
AutoRecover = "2"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
ZoneMap\Domains\ssl.projectscorp.net
http = "2"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
ZoneMap\Domains\ssl.projectscorp.net
https = "2"

Other Details

This backdoor connects to the following possibly malicious URL:

  • http://ssl.{BLOCKED}tscorp.net/pic/index.asp

This report is generated via an automated analysis system.

  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

Delete this registry key

[ 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_CURRENT_USER\Software
    • AdobeSoft
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer
    • Recovery
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\Domains
    • ssl.projectscorp.net

Step 3

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_CURRENT_USER\Software\AdobeSoft
    • IMJPMIG8.1B55 = "%User Profile%\B558A7CE\msdtc.exe /Start"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Recovery
    • AutoRecover = "2"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\Domains\ssl.projectscorp.net
    • http = "2"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\Domains\ssl.projectscorp.net
    • https = "2"

Step 4

Search and delete these folders

[ 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\B558A7CE
  • %System%\B558A7CE

Step 5

Scan your computer with your Trend Micro product to delete files detected as BKDR_MISDAT.AA. 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 6

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.

  • %Application Data%\53812.tmp
  • %Application Data%\53843.tmp


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