TROJ_SWISYN.SMT


 ALIASES:

TrojanDropper:Win32/Swisyn.A (Microsoft); BackDoor-EJG (McAfee); Trojan Horse (Symantec); TrojanDropper.Win32.Swisyn.B (fs) (Sunbelt); Trojan.Generic.3226897 (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:

6,150,656 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

27 Sep 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 creates the following folders:

  • %User Profile%\Microsoft\HTML Help

(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.)

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Messenger = "%User Profile%\Application Data\msnmsgr.exe"

Other System Modifications

This Trojan deletes the following files:

  • %System Root%\system.bat

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

It adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
ActiveMovie\devenum\{4EFE2452-168A-11D1-BC76-00C04FB9453B}

HKEY_CURRENT_USER\Software\Microsoft\
ActiveMovie\devenum\{4EFE2452-168A-11D1-BC76-00C04FB9453B}\
Default MidiOut Device

HKEY_CURRENT_USER\Software\Microsoft\
ActiveMovie\devenum\{E0F158E1-CB04-11D0-BD4E-00A0C911CE86}

HKEY_CURRENT_USER\Software\Microsoft\
ActiveMovie\devenum\{E0F158E1-CB04-11D0-BD4E-00A0C911CE86}\
Default DirectSound Device

HKEY_CURRENT_USER\Software\Microsoft\
Multimedia\ActiveMovie\Filter Cache

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows
RegisteredOrganization = "snkrnn"

HKEY_CURRENT_USER\Software\Microsoft\
ActiveMovie\devenum\{4EFE2452-168A-11D1-BC76-00C04FB9453B}\
Default MidiOut Device
FriendlyName = "Default MidiOut Device"

HKEY_CURRENT_USER\Software\Microsoft\
ActiveMovie\devenum\{4EFE2452-168A-11D1-BC76-00C04FB9453B}\
Default MidiOut Device
CLSID = "{07B65360-C445-11CE-AFDE-00AA006C14F4}"

HKEY_CURRENT_USER\Software\Microsoft\
ActiveMovie\devenum\{4EFE2452-168A-11D1-BC76-00C04FB9453B}\
Default MidiOut Device
FilterData = "{random values}"

HKEY_CURRENT_USER\Software\Microsoft\
ActiveMovie\devenum\{4EFE2452-168A-11D1-BC76-00C04FB9453B}\
Default MidiOut Device
MidiOutId = "ffffffff"

HKEY_CURRENT_USER\Software\Microsoft\
ActiveMovie\devenum\{E0F158E1-CB04-11D0-BD4E-00A0C911CE86}\
Default DirectSound Device
FriendlyName = "Default DirectSound Device"

HKEY_CURRENT_USER\Software\Microsoft\
ActiveMovie\devenum\{E0F158E1-CB04-11D0-BD4E-00A0C911CE86}\
Default DirectSound Device
CLSID = "{79376820-07D0-11CF-A24D-0020AFD79767}"

HKEY_CURRENT_USER\Software\Microsoft\
ActiveMovie\devenum\{E0F158E1-CB04-11D0-BD4E-00A0C911CE86}\
Default DirectSound Device
FilterData = "{random values}"

HKEY_CURRENT_USER\Software\Microsoft\
ActiveMovie\devenum\{E0F158E1-CB04-11D0-BD4E-00A0C911CE86}\
Default DirectSound Device
DSGuid = "{00000000-0000-0000-0000-000000000000}"

HKEY_CURRENT_USER\Software\Microsoft\
Multimedia\ActiveMovie\Filter Cache
0 = "{random values}"

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
MediaPlayer
MP2.SaveDir = "%Program Files%\Windows Media Player"

(Note: The default value data of the said registry entry is %Program Files%\Windows Media Player.)

It deletes the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\MUILanguages\
FileVersions

Dropping Routine

This Trojan drops the following files:

  • %User Profile%\Application Data\ntcom.dll
  • %User Profile%\Application Data\msnmsgr.exe
  • %User Profile%\Application Data\Agladikca.mp3
  • system.bat
  • %User Profile%\HTML Help\hh.dat

(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.)

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

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\Microsoft\ActiveMovie\devenum
    • {4EFE2452-168A-11D1-BC76-00C04FB9453B}
  • In HKEY_CURRENT_USER\Software\Microsoft\ActiveMovie\devenum\{4EFE2452-168A-11D1-BC76-00C04FB9453B}
    • Default MidiOut Device
  • In HKEY_CURRENT_USER\Software\Microsoft\ActiveMovie\devenum
    • {E0F158E1-CB04-11D0-BD4E-00A0C911CE86}
  • In HKEY_CURRENT_USER\Software\Microsoft\ActiveMovie\devenum\{E0F158E1-CB04-11D0-BD4E-00A0C911CE86}
    • Default DirectSound Device
  • In HKEY_CURRENT_USER\Software\Microsoft\Multimedia\ActiveMovie
    • Filter Cache

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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • Messenger = "%User Profile%\Application Data\msnmsgr.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows
    • RegisteredOrganization = "snkrnn"
  • In HKEY_CURRENT_USER\Software\Microsoft\ActiveMovie\devenum\{4EFE2452-168A-11D1-BC76-00C04FB9453B}\Default MidiOut Device
    • FriendlyName = "Default MidiOut Device"
  • In HKEY_CURRENT_USER\Software\Microsoft\ActiveMovie\devenum\{4EFE2452-168A-11D1-BC76-00C04FB9453B}\Default MidiOut Device
    • CLSID = "{07B65360-C445-11CE-AFDE-00AA006C14F4}"
  • In HKEY_CURRENT_USER\Software\Microsoft\ActiveMovie\devenum\{4EFE2452-168A-11D1-BC76-00C04FB9453B}\Default MidiOut Device
    • FilterData = "{random values}"
  • In HKEY_CURRENT_USER\Software\Microsoft\ActiveMovie\devenum\{4EFE2452-168A-11D1-BC76-00C04FB9453B}\Default MidiOut Device
    • MidiOutId = "ffffffff"
  • In HKEY_CURRENT_USER\Software\Microsoft\ActiveMovie\devenum\{E0F158E1-CB04-11D0-BD4E-00A0C911CE86}\Default DirectSound Device
    • FriendlyName = "Default DirectSound Device"
  • In HKEY_CURRENT_USER\Software\Microsoft\ActiveMovie\devenum\{E0F158E1-CB04-11D0-BD4E-00A0C911CE86}\Default DirectSound Device
    • CLSID = "{79376820-07D0-11CF-A24D-0020AFD79767}"
  • In HKEY_CURRENT_USER\Software\Microsoft\ActiveMovie\devenum\{E0F158E1-CB04-11D0-BD4E-00A0C911CE86}\Default DirectSound Device
    • FilterData = "{random values}"
  • In HKEY_CURRENT_USER\Software\Microsoft\ActiveMovie\devenum\{E0F158E1-CB04-11D0-BD4E-00A0C911CE86}\Default DirectSound Device
    • DSGuid = "{00000000-0000-0000-0000-000000000000}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Multimedia\ActiveMovie\Filter Cache
    • 0 = "{random values}"

Step 5

Restore these modified registry values

[ Learn More ]

Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MediaPlayer
    • From: MP2.SaveDir = "%Program Files%\Windows Media Player"
      To: MP2.SaveDir = ""%Program Files%\Windows Media Player""

Step 6

Search and delete these components

[ Learn More ]
There may be some components 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%\Application Data\ntcom.dll
  • %User Profile%\Application Data\msnmsgr.exe
  • %User Profile%\Application Data\Agladikca.mp3
  • system.bat
  • %User Profile%\HTML Help\hh.dat

Step 7

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.
  • %User Profile%\Microsoft\HTML Help

Step 8

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

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 Root%\system.bat

Step 10

Restore these deleted registry keys/values from backup

*Note: Only Microsoft-related keys/values will be restored. If the malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.

  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\MUILanguages
    • FileVersions


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