ALIASES:

Trojan:Win32/Malagent (Microsoft); Backdoor.Trojan (Symantec); Backdoor.Win32.Bifrose.egmk (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Generic.6828498 (FSecure)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan 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: 1,062,400 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 05 Apr 2012

Arrival Details

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

  • %Windows%\InstallDir\Server.exe

(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)

It creates the following folders:

  • %Windows%\InstallDir

(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
HKLM = "%Windows%\InstallDir\Server.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
HKCU = "%Windows%\InstallDir\Server.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{5460C4DF-B266-909E-CB58-E32B79832EB2}
StubPath = "%Windows%\InstallDir\Server.exe restart"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
HKCU = "%Program Files%\Internet Explorer\iexplore.exe"

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\Enigma Protector\
3C0510529FF0AA04-06A84D39F505D12F

HKEY_CURRENT_USER\SOFTWARE\EnigmaDevelopers

HKEY_CURRENT_USER\Software\Enigma Protector\
3C0510529FF0AA04-06A84D39F505D12F\72AA3BA481186B0D-DBE029A3F70B58C5

HKEY_CURRENT_USER\Software\Configs

HKEY_LOCAL_MACHINE\Software\Microsoft\
Active Setup\Installed Components\{5460C4DF-B266-909E-CB58-E32B79832EB2}

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Enigma Protector\
3C0510529FF0AA04-06A84D39F505D12F\72AA3BA481186B0D-DBE029A3F70B58C5
F0FF9D0D = "{random values}"

HKEY_CURRENT_USER\Software\Enigma Protector\
3C0510529FF0AA04-06A84D39F505D12F
Options = "{random values}"

HKEY_CURRENT_USER\Software\Configs
MyConfigs = "{random characters}"

HKEY_CURRENT_USER\Software\Configs
InstalledServer = "{malware path and file name}"

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\1.html

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine: 9.200

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

Restart in Safe Mode

[ Learn More ]

Step 3

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\Enigma Protector
    • 3C0510529FF0AA04-06A84D39F505D12F
  • In HKEY_CURRENT_USER\SOFTWARE
    • EnigmaDevelopers
  • In HKEY_CURRENT_USER\Software\Enigma Protector\3C0510529FF0AA04-06A84D39F505D12F
    • 72AA3BA481186B0D-DBE029A3F70B58C5
  • In HKEY_CURRENT_USER\Software
    • Configs
  • In HKEY_LOCAL_MACHINE\Software\Microsoft\Active Setup\Installed Components
    • {5460C4DF-B266-909E-CB58-E32B79832EB2}

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\Windows\CurrentVersion\Run
    • HKLM = "%Windows%\InstallDir\Server.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • HKCU = "%Windows%\InstallDir\Server.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{5460C4DF-B266-909E-CB58-E32B79832EB2}
    • StubPath = "%Windows%\InstallDir\Server.exe restart"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • HKCU = "%Program Files%\Internet Explorer\iexplore.exe"
  • In HKEY_CURRENT_USER\Software\Enigma Protector\3C0510529FF0AA04-06A84D39F505D12F\72AA3BA481186B0D-DBE029A3F70B58C5
    • F0FF9D0D = "{random values}"
  • In HKEY_CURRENT_USER\Software\Enigma Protector\3C0510529FF0AA04-06A84D39F505D12F
    • Options = "{random values}"
  • In HKEY_CURRENT_USER\Software\Configs
    • MyConfigs = "{random characters}"
  • In HKEY_CURRENT_USER\Software\Configs
    • InstalledServer = "{malware path and file name}"

Step 5

Search and delete this file

[ 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 Temp%\1.html

Step 6

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.
  • %Windows%\InstallDir

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_BIFROSE.USL01VC. 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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