BKDR_EGGDROP.AE

October 08, 2012
 Analysis by: Michael Cabel
 PLATFORM:

Windows 2000, XP, Server 2003

 OVERALL RISK RATING:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 INFORMATION EXPOSURE:

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Upon execution, this backdoor connects to the Internet Relay Chat (IRC) server irc.2ch.net, where it joins the channel ##ReVoLuTiOn##.

It opens the port TCP 6667 where it listens for remote commands.

This backdoor may be downloaded by other malware/grayware/spyware from remote sites. It arrives as a component bundled with malware/grayware packages.

It executes then deletes itself afterward.

It connects to Internet Relay Chat (IRC) servers. It joins an Internet Relay Chat (IRC) channel.

  TECHNICAL DETAILS

File Size:

92,209 bytes

File Type:

PE

Memory Resident:

Yes

Initial Samples Received Date:

20 Jul 2009

Arrival Details

This backdoor may be downloaded by other malware/grayware/spyware from remote sites.

It arrives as a component bundled with malware/grayware packages.

Installation

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

  • %System%\wininit.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

It executes then deletes itself afterward.

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
OLE
Microsoft Security Process = "wininit.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Microsoft Security Process = "wininit.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\RunServices
Microsoft Security Process = "wininit.exe"

Backdoor Routine

This backdoor opens the following port(s) where it listens for remote commands:

  • TCP 6667

It connects to any of the following Internet Relay Chat (IRC) servers:

  • irc.2ch.net

It joins any of the following Internet Relay Chat (IRC) channels:

  • ##ReVoLuTiOn##

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI PATTERN File:

6.290.12

VSAPI PATTERN Date:

20 Jul 2009

VSAPI PATTERN Date:

7/20/2009 12:00:00 AM

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Terminate a process file/s detected as BKDR_EGGDROP.AE

[ Learn More ]

*Note: If the detected file/s is/are not displayed in theWindows Task Manager, continue doing the next steps.

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\Microsoft\OLE
    • Microsoft Security Process = wininit.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • Microsoft Security Process = wininit.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
    • Microsoft Security Process = wininit.exe

Step 4

Scan your computer with your Trend Micro product to delete files detected as BKDR_EGGDROP.AE. 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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