TROJ_SWISYN.SMFP

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.

File Size:

192,512 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

14 Jun 2013

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:

%Program Files%\Common Files\svchost.exe

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

It creates the following folders:

%Windows%\log
%Program Files%\Common Files\log
%Program Files%\Common Files\log\CWS07D105

(Note: %Windows% is the Windows folder, which is usually C:\Windows.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

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
Userinit = "%System%\userinit.exe,%Program Files%\Common Files\svchost.exe -s"

(Note: The default value data of the said registry entry is %Windows%\system32\userinit.exe,.)

Other System Modifications

This Trojan deletes the following files:

%User Temp%\alldetails.txt

(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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced\Folder\Hidden\
SHOWALL
CheckedValue = "0x00000001 (1)"

(Note: The default value data of the said registry entry is 1.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced\Folder\HideFileExt
UncheckedValue = "0x00000000 (0)"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
RFC1156Agent\CurrentVersion\Parameters
TrapPollTimeMilliSecs = "3a98"

(Note: The default value data of the said registry entry is 3a98.)

Dropping Routine

This Trojan drops the following files:

%User Temp%\xx2
%User Temp%\xx3
%User Temp%\xx4
%User Temp%\xx5
%User Temp%\xx6
%User Temp%\xx7
%User Temp%\xx8
%Windows%\log\20130612162655.cab
%User Temp%\xx9
%User Temp%\xx10
%User Temp%\xx11
%Windows%\log\20130612162655.cab.bak
%User Temp%\xx12
%User Temp%\xx13
%User Temp%\xx14
%User Temp%\xx15
%User Temp%\xx16
%User Temp%\xx17
%User Temp%\xx18
%User Temp%\xx19
%User Temp%\xx20
%User Temp%\xx21
%User Temp%\xx22
%User Temp%\xx23
%User Temp%\xx24
%User Temp%\xx25
%User Temp%\xx26
%User Temp%\xx27
%User Temp%\xx28
%User Temp%\xx29
%User Temp%\xx30
%User Temp%\xx31
%User Temp%\xx32
%User Temp%\xx33
%User Temp%\xx34
%User Temp%\xx35
%User Temp%\xx36
%User Temp%\xx37
%User Temp%\xx38
%User Temp%\xx39
%User Temp%\xx40
%User Temp%\xx41
%User Temp%\xx42
%User Temp%\xx43
%User Temp%\xx44
%User Temp%\xx45
%User Temp%\xx46
%User Temp%\xx47
%User Temp%\xx48
%User Temp%\xx49
%User Temp%\xx50
%User Temp%\xx51
%User Temp%\xx52
%User Temp%\xx53
%User Temp%\xx54
%User Temp%\xx55
%User Temp%\xx56
%User Temp%\xx57
%User Temp%\xx58
%User Temp%\xx59
%User Temp%\xx60
%User Temp%\xx61
%User Temp%\xx62
%User Temp%\xx63
%User Temp%\xx64
%User Temp%\xx65
%User Temp%\xx66
%User Temp%\xx67
%User Temp%\xx68
%User Temp%\xx69
%User Temp%\xx70
%User Temp%\xx71
%User Temp%\xx72
%User Temp%\xx73
%User Temp%\xx74
%User Temp%\xx75
%User Temp%\xx76
%User Temp%\xx77
%User Temp%\xx78
%User Temp%\xx79
%User Temp%\xx80
%User Temp%\xx81
%User Temp%\xx82
%User Temp%\xx83
%User Temp%\xx84
%User Temp%\xx85
%User Temp%\xx86
%User Temp%\xx87
%User Temp%\xx88
%User Temp%\xx89
%User Temp%\xx90
%User Temp%\xx91
%User Temp%\xx92
%User Temp%\xx93
%User Temp%\xx94
%User Temp%\xx95
%User Temp%\xx96
%User Temp%\xx97
%User Temp%\xx98
%User Temp%\xx99
%User Temp%\xx100
%User Temp%\xx101
%Program Files%\Common Files\log\CWS07D105\20130612162655.cab.bak

(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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %Windows% is the Windows folder, which is usually C:\Windows.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

This report is generated via an automated analysis system.

Minimum Scan Engine:

9.300

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

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

[ Learn More ]

To identify and delete the malware/grayware file:

• On Windows XP and Server 2003 systems:

Scan your computer with your Trend Micro product and then take note of the names of the malware/grayware files detected.
Click Start>Run. In the Open input box, type secpol.msc and press Enter.
In the left panel, double-click Local Policies>Security Options.
In the right panel, double-click Recovery Console: Allow floppy copy and access to all drives and folders.
Select Enabled and click OK.
Insert the Windows Installation CD into the CD drive, then restart your computer.
When prompted, press any key to boot from the CD.
On the main menu, type r to go to the Recovery Console.
Type the number that corresponds to the drive and directory that contains Windows (usually C:\WINDOWS) and press Enter.
Type the Administrator password and press Enter.
In the input box, type the following then press Enter:
SET AllowAllPaths = TRUE
del "{malware/grayware path and file name}"
Type exit and press Enter to restart the system normally.

• On Windows Vista and 7 systems:

Scan your computer with your Trend Micro product and then take note of the names of the malware/grayware files detected.
Insert your Windows Installation DVD in the DVD drive, then Press the restart button.
When prompted, press any key to boot from the CD.
Depending on your Windows Installation DVD, you might be required to select the installation language. Then on the Install Windows window, choose your language, locale, and keyboard layout or input method. Click Next, then click Repair your computer.
Select Use recovery tools that can help fix problems starting Windows. Select your installation of Windows. Click Next.
If the Startup Repair window appears, click Cancel, Yes, then Finish.
In the System Recovery Options window, click Command Prompt.
In the Command Prompt window, type the following then press Enter:
BootRec.exe /fixmbr
del "{malware/grayware path and file name}"
Type exit and press Enter to close the Command Prompt window.
Click Restart to restart the system normally.

Step 3

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\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL
- From: CheckedValue = "0x00000001 (1)"
  To: CheckedValue = ""1""

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\HideFileExt
- UncheckedValue = "0x00000000 (0)"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\RFC1156Agent\CurrentVersion\Parameters
- From: TrapPollTimeMilliSecs = "3a98"
  To: TrapPollTimeMilliSecs = ""3a98""

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
- From: Userinit = "%System%\userinit.exe,%Program Files%\Common Files\svchost.exe -s"
  To: Userinit = ""%Windows%\system32\userinit.exe,""

Step 4

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 Temp%\xx2
%User Temp%\xx3
%User Temp%\xx4
%User Temp%\xx5
%User Temp%\xx6
%User Temp%\xx7
%User Temp%\xx8
%Windows%\log\20130612162655.cab
%User Temp%\xx9
%User Temp%\xx10
%User Temp%\xx11
%Windows%\log\20130612162655.cab.bak
%User Temp%\xx12
%User Temp%\xx13
%User Temp%\xx14
%User Temp%\xx15
%User Temp%\xx16
%User Temp%\xx17
%User Temp%\xx18
%User Temp%\xx19
%User Temp%\xx20
%User Temp%\xx21
%User Temp%\xx22
%User Temp%\xx23
%User Temp%\xx24
%User Temp%\xx25
%User Temp%\xx26
%User Temp%\xx27
%User Temp%\xx28
%User Temp%\xx29
%User Temp%\xx30
%User Temp%\xx31
%User Temp%\xx32
%User Temp%\xx33
%User Temp%\xx34
%User Temp%\xx35
%User Temp%\xx36
%User Temp%\xx37
%User Temp%\xx38
%User Temp%\xx39
%User Temp%\xx40
%User Temp%\xx41
%User Temp%\xx42
%User Temp%\xx43
%User Temp%\xx44
%User Temp%\xx45
%User Temp%\xx46
%User Temp%\xx47
%User Temp%\xx48
%User Temp%\xx49
%User Temp%\xx50
%User Temp%\xx51
%User Temp%\xx52
%User Temp%\xx53
%User Temp%\xx54
%User Temp%\xx55
%User Temp%\xx56
%User Temp%\xx57
%User Temp%\xx58
%User Temp%\xx59
%User Temp%\xx60
%User Temp%\xx61
%User Temp%\xx62
%User Temp%\xx63
%User Temp%\xx64
%User Temp%\xx65
%User Temp%\xx66
%User Temp%\xx67
%User Temp%\xx68
%User Temp%\xx69
%User Temp%\xx70
%User Temp%\xx71
%User Temp%\xx72
%User Temp%\xx73
%User Temp%\xx74
%User Temp%\xx75
%User Temp%\xx76
%User Temp%\xx77
%User Temp%\xx78
%User Temp%\xx79
%User Temp%\xx80
%User Temp%\xx81
%User Temp%\xx82
%User Temp%\xx83
%User Temp%\xx84
%User Temp%\xx85
%User Temp%\xx86
%User Temp%\xx87
%User Temp%\xx88
%User Temp%\xx89
%User Temp%\xx90
%User Temp%\xx91
%User Temp%\xx92
%User Temp%\xx93
%User Temp%\xx94
%User Temp%\xx95
%User Temp%\xx96
%User Temp%\xx97
%User Temp%\xx98
%User Temp%\xx99
%User Temp%\xx100
%User Temp%\xx101
%Program Files%\Common Files\log\CWS07D105\20130612162655.cab.bak

To manually delete a malware/grayware component from an affected system:

• For Windows 2000, Windows XP, and Windows Server 2003:

Right-click Start then click Search....
In the Named input box, type:
%User Temp%\xx2
%User Temp%\xx3
%User Temp%\xx4
%User Temp%\xx5
%User Temp%\xx6
%User Temp%\xx7
%User Temp%\xx8
%Windows%\log\20130612162655.cab
%User Temp%\xx9
%User Temp%\xx10
%User Temp%\xx11
%Windows%\log\20130612162655.cab.bak
%User Temp%\xx12
%User Temp%\xx13
%User Temp%\xx14
%User Temp%\xx15
%User Temp%\xx16
%User Temp%\xx17
%User Temp%\xx18
%User Temp%\xx19
%User Temp%\xx20
%User Temp%\xx21
%User Temp%\xx22
%User Temp%\xx23
%User Temp%\xx24
%User Temp%\xx25
%User Temp%\xx26
%User Temp%\xx27
%User Temp%\xx28
%User Temp%\xx29
%User Temp%\xx30
%User Temp%\xx31
%User Temp%\xx32
%User Temp%\xx33
%User Temp%\xx34
%User Temp%\xx35
%User Temp%\xx36
%User Temp%\xx37
%User Temp%\xx38
%User Temp%\xx39
%User Temp%\xx40
%User Temp%\xx41
%User Temp%\xx42
%User Temp%\xx43
%User Temp%\xx44
%User Temp%\xx45
%User Temp%\xx46
%User Temp%\xx47
%User Temp%\xx48
%User Temp%\xx49
%User Temp%\xx50
%User Temp%\xx51
%User Temp%\xx52
%User Temp%\xx53
%User Temp%\xx54
%User Temp%\xx55
%User Temp%\xx56
%User Temp%\xx57
%User Temp%\xx58
%User Temp%\xx59
%User Temp%\xx60
%User Temp%\xx61
%User Temp%\xx62
%User Temp%\xx63
%User Temp%\xx64
%User Temp%\xx65
%User Temp%\xx66
%User Temp%\xx67
%User Temp%\xx68
%User Temp%\xx69
%User Temp%\xx70
%User Temp%\xx71
%User Temp%\xx72
%User Temp%\xx73
%User Temp%\xx74
%User Temp%\xx75
%User Temp%\xx76
%User Temp%\xx77
%User Temp%\xx78
%User Temp%\xx79
%User Temp%\xx80
%User Temp%\xx81
%User Temp%\xx82
%User Temp%\xx83
%User Temp%\xx84
%User Temp%\xx85
%User Temp%\xx86
%User Temp%\xx87
%User Temp%\xx88
%User Temp%\xx89
%User Temp%\xx90
%User Temp%\xx91
%User Temp%\xx92
%User Temp%\xx93
%User Temp%\xx94
%User Temp%\xx95
%User Temp%\xx96
%User Temp%\xx97
%User Temp%\xx98
%User Temp%\xx99
%User Temp%\xx100
%User Temp%\xx101
%Program Files%\Common Files\log\CWS07D105\20130612162655.cab.bak
In the Look In drop-down list, select My Computer then press Enter.
Once located, select the file then press SHIFT+DELETE to delete it.
Repeat the said steps for all files listed.

• For Windows Vista and Windows 7 users:

Click Start>Computer.
In the Search input box, type:
%User Temp%\xx2
%User Temp%\xx3
%User Temp%\xx4
%User Temp%\xx5
%User Temp%\xx6
%User Temp%\xx7
%User Temp%\xx8
%Windows%\log\20130612162655.cab
%User Temp%\xx9
%User Temp%\xx10
%User Temp%\xx11
%Windows%\log\20130612162655.cab.bak
%User Temp%\xx12
%User Temp%\xx13
%User Temp%\xx14
%User Temp%\xx15
%User Temp%\xx16
%User Temp%\xx17
%User Temp%\xx18
%User Temp%\xx19
%User Temp%\xx20
%User Temp%\xx21
%User Temp%\xx22
%User Temp%\xx23
%User Temp%\xx24
%User Temp%\xx25
%User Temp%\xx26
%User Temp%\xx27
%User Temp%\xx28
%User Temp%\xx29
%User Temp%\xx30
%User Temp%\xx31
%User Temp%\xx32
%User Temp%\xx33
%User Temp%\xx34
%User Temp%\xx35
%User Temp%\xx36
%User Temp%\xx37
%User Temp%\xx38
%User Temp%\xx39
%User Temp%\xx40
%User Temp%\xx41
%User Temp%\xx42
%User Temp%\xx43
%User Temp%\xx44
%User Temp%\xx45
%User Temp%\xx46
%User Temp%\xx47
%User Temp%\xx48
%User Temp%\xx49
%User Temp%\xx50
%User Temp%\xx51
%User Temp%\xx52
%User Temp%\xx53
%User Temp%\xx54
%User Temp%\xx55
%User Temp%\xx56
%User Temp%\xx57
%User Temp%\xx58
%User Temp%\xx59
%User Temp%\xx60
%User Temp%\xx61
%User Temp%\xx62
%User Temp%\xx63
%User Temp%\xx64
%User Temp%\xx65
%User Temp%\xx66
%User Temp%\xx67
%User Temp%\xx68
%User Temp%\xx69
%User Temp%\xx70
%User Temp%\xx71
%User Temp%\xx72
%User Temp%\xx73
%User Temp%\xx74
%User Temp%\xx75
%User Temp%\xx76
%User Temp%\xx77
%User Temp%\xx78
%User Temp%\xx79
%User Temp%\xx80
%User Temp%\xx81
%User Temp%\xx82
%User Temp%\xx83
%User Temp%\xx84
%User Temp%\xx85
%User Temp%\xx86
%User Temp%\xx87
%User Temp%\xx88
%User Temp%\xx89
%User Temp%\xx90
%User Temp%\xx91
%User Temp%\xx92
%User Temp%\xx93
%User Temp%\xx94
%User Temp%\xx95
%User Temp%\xx96
%User Temp%\xx97
%User Temp%\xx98
%User Temp%\xx99
%User Temp%\xx100
%User Temp%\xx101
%Program Files%\Common Files\log\CWS07D105\20130612162655.cab.bak
Once located, select the file then press SHIFT+DELETE to delete it.
Repeat the said steps for all files listed.
*Note: Read the following Microsoft page if these steps do not work on Windows 7.

Step 5

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.

%Windows%\log
%Program Files%\Common Files\log
%Program Files%\Common Files\log\CWS07D105

Step 6

Scan your computer with your Trend Micro product to delete files detected as TROJ_SWISYN.SMFP. 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 7

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.

%User Temp%\alldetails.txt

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