Analysis by: Jed Valderama

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel: Dropped by other malware

This backdoor may be dropped by other malware.

It executes commands from a remote malicious user, effectively compromising the affected system. It connects to a website to send and receive information.

It retrieves specific information from the affected system.

  TECHNICAL DETAILS

File Size: 155,648 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 22 Jun 2012
Payload: Steals information, Terminates processes

Arrival Details

This backdoor may be dropped by the following malware:

  • TROJ_MDROPPR.CE

Installation

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

  • %User Profile%\Application Data\360\Live360.exe
  • %User Profile%\Application Data\temp\temp1.exe

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

It adds the following processes:

  • winlogon.exe

It creates the following folders:

  • %User Profile%\Application Data\360
  • %User Profile%\Application Data\temp

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
UKey = %User Profile%\Application Data\360\Live360.exe

Other System Modifications

This backdoor adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\rar

Backdoor Routine

This backdoor executes the following commands from a remote malicious user:

  • Log keystrokes
  • Download and execute file(s)
  • Manipulate files
  • Manipulate directories
  • Steals user credentials such as user name and passwords, which are related to the following applications:

    -Internet Explorer Password-Protected sites
    -Microsoft Outlook
    -HTTP
    -IMAP
    -Protected Storage
    -POP3
    -SMTP
    -HTTPMail
    -Windows Messaging

It connects to the following websites to send and receive information:

  • minny1.{BLOCKED}p.net

Process Termination

This backdoor terminates processes or services that contain any of the following strings if found running in the affected system's memory:

  • 360Safe
  • 360safe.exe
  • 360sd.exe
  • 360tray.exe
  • AVGIDSMonitor.exe
  • Avast
  • FProt
  • FProtTray.exe
  • FrzState2K.exe
  • KAVsvc.exe
  • KSafeTray.exe
  • KVwsc.exe
  • LiveUpdate360
  • MPMon.exe
  • Mcafee
  • Mcshield.exe
  • NOD32
  • RavMon.exe
  • RavMonD.exe
  • RsTray.exe
  • SfCtlCom.exe
  • UfNavi.exe
  • UfSeAgnt.exe
  • WinMe
  • ZhuDongFangYu.exe
  • ashServ.exe
  • avgrsx.exe
  • avp.exe
  • ccSvcHst.exe
  • ekrn.exe
  • explorer.exe
  • kav.exe
  • kwstray.exe
  • kxetray
  • nod32krn.exe
  • nscsrvce.exe
  • ravtask.exe
  • rising.exe
  • rtvscan.exe
  • ESET Filter Service
  • ESET5

Information Theft

This backdoor retrieves the following information from the affected system:

  • Local IP address
  • Operating system
  • Computer name
  • User name
  • Processor information

Stolen Information

This backdoor saves the stolen information in the following file:

  • %User Profile%\user.bin

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

NOTES:

This backdoor injects its code to the created process WINLOGON.EXE.

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 9.330.01
FIRST VSAPI PATTERN DATE: 17 Aug 2012

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

Remove malware files dropped/downloaded by BKDR_INVICM.A

    TROJ_MDROPPR.CE

Step 3

Restart in Safe Mode

[ Learn More ]

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\360
%User Profile%\Application Data\temp

Step 5

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_LOCAL_MACHINE\SOFTWARE
    • rar

Step 6

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\Windows\CurrentVersion\Run
    • UKey = %User Profile%\Application Data\360\Live360.exe

Step 7

Search and delete these files

[ Learn More ]
There may be some component 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.
  • %User Profile%\user.bin

Step 8

Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_INVICM.A. 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 9

Scan your computer with your Trend Micro product to delete files detected as BKDR_INVICM.A. 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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