TROJ_SWISYN.CI

 Analysis by: Sabrina Lei Sioting
 Modified by: Automation

 ALIASES:

Trojan.Win32.Generic!BT (Sunbelt)

 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:

1,435,879 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

31 May 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 Temp%\genteeB4
  • %Program Files%\Simurgh
  • %Start Menu%\Programs\Simurgh

(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.. %Program Files% is the default Program Files folder, usually C:\Program Files.. %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Profiles\{user name}\Start Menu on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu on Windows NT and C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003.)

Autostart Technique

This Trojan modifies the following registry entries to ensure it automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
shell = "explorer.exe %System%\drivers\lsass.exe"

(Note: The default value data of the said registry entry is Explorer.exe.)

Other System Modifications

This Trojan deletes the following files:

  • %Windows%\Media\Windows XP Start.wav

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

It adds the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\Lsa\SspiCache\
schannel.dll

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{3B7C8860-D78F-101B-B9B5-04021C009402}\Control

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{3B7C8863-D78F-101B-B9B5-04021C009402}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{3B7C8863-D78F-101B-B9B5-04021C009402}\1.2\
0

HKEY_CLASSES_ROOT\CLSID\{B617B991-A767-4F05-99BA-AC6FCABB102E}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{B617B991-A767-4F05-99BA-AC6FCABB102E}\InprocServer32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{48E59293-9880-11CF-9754-00AA00C00908}\Control

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{48E59290-9880-11CF-9754-00AA00C00908}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{48E59290-9880-11CF-9754-00AA00C00908}\1.0\
0

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{B617B991-A767-4F05-99BA-AC6FCABB102E}\InprocServer32
ThreadingModel = "Apartment"

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\Lsa
LsaPid = "5"

(Note: The default value data of the said registry entry is 2fc.)

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{3B7C8860-D78F-101B-B9B5-04021C009402}\InprocServer32
ThreadingModel = "Apartment"

(Note: The default value data of the said registry entry is Apartment.)

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{2334D2B1-713E-11CF-8AE5-00AA00C00905}\TypeLib
Version = "1.2"

(Note: The default value data of the said registry entry is 2.0.)

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{2334D2B3-713E-11CF-8AE5-00AA00C00905}\TypeLib
Version = "1.2"

(Note: The default value data of the said registry entry is 2.0.)

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{ED117630-4090-11CF-8981-00AA00688B10}\TypeLib
Version = "1.2"

(Note: The default value data of the said registry entry is 1.2.)

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{859321D0-3FD1-11CF-8981-00AA00688B10}\TypeLib
Version = "1.2"

(Note: The default value data of the said registry entry is 1.2.)

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{E9A5593C-CAB0-11D1-8C0B-0000F8754DA1}\TypeLib
Version = "1.2"

(Note: The default value data of the said registry entry is 1.2.)

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{3B7C8862-D78F-101B-B9B5-04021C009402}\TypeLib
Version = "1.2"

(Note: The default value data of the said registry entry is 1.2.)

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{48E59293-9880-11CF-9754-00AA00C00908}\InprocServer32
ThreadingModel = "Apartment"

(Note: The default value data of the said registry entry is Apartment.)

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{48E59291-9880-11CF-9754-00AA00C00908}\TypeLib
Version = "1.0"

(Note: The default value data of the said registry entry is 1.0.)

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{48E59292-9880-11CF-9754-00AA00C00908}\TypeLib
Version = "1.0"

(Note: The default value data of the said registry entry is 1.0.)

It deletes the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{3B7C8860-D78F-101B-B9B5-04021C009402}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{78E5A540-1850-11CF-9D53-00AA003C9CB6}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{AFC634B0-4B8B-11CF-8989-00AA00688B10}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{B617B991-A767-4F05-99BA-AC6FCABB102E}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{48E59293-9880-11CF-9754-00AA00C00908}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{48E59294-9880-11CF-9754-00AA00C00908}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{48E59295-9880-11CF-9754-00AA00C00908}

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\genteert.dll
  • %User Temp%\genteeB4.tmp
  • %User Temp%\genteeB4\guig.dll
  • %User Temp%\genteeB4\setup_temp.gea
  • %User Temp%\genteeB4\2install - 1.bmp
  • %System%\drivers\lsass.exe
  • %System%\drivers\MSINET.OCX
  • %System%\drivers\richtx32.ocx
  • %System%\drivers\shdocvw.dll
  • %User Temp%\genteeB4\4default - 1.bmp
  • %Program Files%\Simurgh\_ci_gentee
  • %Program Files%\Simurgh\Simurgh.exe
  • %Start Menu%\Programs\Simurgh\Uninstall.lnk

(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.. %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.. %Program Files% is the default Program Files folder, usually C:\Program Files.. %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Profiles\{user name}\Start Menu on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu on Windows NT and C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}live.com/ip.php

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

Identify and delete files detected as TROJ_SWISYN.CI using either the Startup Disk or Recovery Console

[ 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_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Lsa\SspiCache
    • schannel.dll
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{3B7C8860-D78F-101B-B9B5-04021C009402}
    • Control
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib
    • {3B7C8863-D78F-101B-B9B5-04021C009402}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{3B7C8863-D78F-101B-B9B5-04021C009402}\1.2
    • 0
  • In HKEY_CLASSES_ROOT\CLSID
    • {B617B991-A767-4F05-99BA-AC6FCABB102E}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{B617B991-A767-4F05-99BA-AC6FCABB102E}
    • InprocServer32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{48E59293-9880-11CF-9754-00AA00C00908}
    • Control
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib
    • {48E59290-9880-11CF-9754-00AA00C00908}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{48E59290-9880-11CF-9754-00AA00C00908}\1.0
    • 0

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\Classes\CLSID\{B617B991-A767-4F05-99BA-AC6FCABB102E}\InprocServer32
    • ThreadingModel = "Apartment"

Step 5

Restore this modified 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\SYSTEM\ControlSet001\Control\Lsa
    • From: LsaPid = "5"
      To: LsaPid = ""2fc""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{3B7C8860-D78F-101B-B9B5-04021C009402}\InprocServer32
    • From: ThreadingModel = "Apartment"
      To: ThreadingModel = ""Apartment""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{2334D2B1-713E-11CF-8AE5-00AA00C00905}\TypeLib
    • From: Version = "1.2"
      To: Version = ""2.0""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{2334D2B3-713E-11CF-8AE5-00AA00C00905}\TypeLib
    • From: Version = "1.2"
      To: Version = ""2.0""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{ED117630-4090-11CF-8981-00AA00688B10}\TypeLib
    • From: Version = "1.2"
      To: Version = ""1.2""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{859321D0-3FD1-11CF-8981-00AA00688B10}\TypeLib
    • From: Version = "1.2"
      To: Version = ""1.2""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{E9A5593C-CAB0-11D1-8C0B-0000F8754DA1}\TypeLib
    • From: Version = "1.2"
      To: Version = ""1.2""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{3B7C8862-D78F-101B-B9B5-04021C009402}\TypeLib
    • From: Version = "1.2"
      To: Version = ""1.2""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{48E59293-9880-11CF-9754-00AA00C00908}\InprocServer32
    • From: ThreadingModel = "Apartment"
      To: ThreadingModel = ""Apartment""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{48E59291-9880-11CF-9754-00AA00C00908}\TypeLib
    • From: Version = "1.0"
      To: Version = ""1.0""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{48E59292-9880-11CF-9754-00AA00C00908}\TypeLib
    • From: Version = "1.0"
      To: Version = ""1.0""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
    • From: shell = "explorer.exe %System%\drivers\lsass.exe"
      To: shell = ""Explorer.exe""

Step 6

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 Temp%\genteert.dll
  • %User Temp%\genteeB4.tmp
  • %User Temp%\genteeB4\guig.dll
  • %User Temp%\genteeB4\setup_temp.gea
  • %User Temp%\genteeB4\2install - 1.bmp
  • %System%\drivers\lsass.exe
  • %System%\drivers\MSINET.OCX
  • %System%\drivers\richtx32.ocx
  • %System%\drivers\shdocvw.dll
  • %User Temp%\genteeB4\4default - 1.bmp
  • %Program Files%\Simurgh\_ci_gentee
  • %Program Files%\Simurgh\Simurgh.exe
  • %Start Menu%\Programs\Simurgh\Uninstall.lnk

Step 7

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 Temp%\genteeB4
  • %Program Files%\Simurgh
  • %Start Menu%\Programs\Simurgh

Step 8

Scan your computer with your Trend Micro product to delete files detected as TROJ_SWISYN.CI. 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.

  • %Windows%\Media\Windows XP Start.wav

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_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
    • {3B7C8860-D78F-101B-B9B5-04021C009402}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
    • {78E5A540-1850-11CF-9D53-00AA003C9CB6}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
    • {AFC634B0-4B8B-11CF-8989-00AA00688B10}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
    • {B617B991-A767-4F05-99BA-AC6FCABB102E}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
    • {48E59293-9880-11CF-9754-00AA00C00908}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
    • {48E59294-9880-11CF-9754-00AA00C00908}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
    • {48E59295-9880-11CF-9754-00AA00C00908}


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