PUA.WIN32.TOMOS.GA

This Potentially Unwanted Application arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites. It may be manually installed by a user.

Arrival Details

This Potentially Unwanted Application arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It may be manually installed by a user.

Installation

This Potentially Unwanted Application drops the following files:

• %User Temp%\nsw{random}.tmp\modern-header.bmp
• %User Temp%\nsw{random}.tmp\modern-wizard.bmp
• %User Temp%\nsw{random}.tmp\nsDialogs.dll
• %User Temp%\nsw{random}.tmp\filesfrog-visible.rtf
• %User Temp%\nsw{random}.tmp\System.dll
• %AppDataLocal%\FilesFrog Update Checker\uninstall.exe
• %Application Data%\Microsoft\Windows\Start Menu\Programs\FilesFrog Update Checker\Check for Updates.lnk
• %Application Data%\Microsoft\Windows\Start Menu\Programs\FilesFrog Update Checker\Uninstall.lnk
• %Desktop%\Check for Updates.lnk
• %AppDataLocal%\FilesFrog Update Checker\update_checker.exe

(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, 7, and 8.. %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local on Windows Vista, 7, and 8.. %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, and 8.. %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\Desktop on Windows Vista, 7, and 8.)

It creates the following folders:

• %AppDataLocal%\FilesFrog Update Checker
• %User Temp%\nsw{random}.tmp
• %Application Data%\Microsoft\Windows\Start Menu\Programs\FilesFrog Update Checker

(Note: %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local on Windows Vista, 7, and 8.. %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, 7, and 8.. %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, and 8.)

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
SDP = "%AppDataLocal%\FilesFrog Update Checker\update_checker.exe /auto"

Other System Modifications

This Potentially Unwanted Application adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
FilesFrog Update Checker

HKEY_CURRENT_USER\Software\Somoto

HKEY_CURRENT_USER\Software\Somoto\
SDP

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
sdp

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
sdp\shell

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
sdp\shell\open

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
sdp\shell\open\
command

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\ProtocolExecute

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\ProtocolExecute\sdp

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
FilesFrog Update Checker
DisplayName = "FilesFrog Update Checker"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
FilesFrog Update Checker
DisplayIcon = "%AppDataLocal%\FilesFrog Update Checker\uninstall.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
FilesFrog Update Checker
UninstallString = "%AppDataLocal%\FilesFrog Update Checker\uninstall.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
FilesFrog Update Checker
NoModify = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
FilesFrog Update Checker
NoRepair = "1"

HKEY_CURRENT_USER\Software\Somoto\
SDP
flags = "32"

HKEY_CURRENT_USER\Software\Somoto\
SDP
nc = "{hex value}"

HKEY_CURRENT_USER\Software\Somoto\
SDP
affid = "filesfrogvisible"

HKEY_CURRENT_USER\Software\Somoto\
SDP
muid = "{UID}"

HKEY_CURRENT_USER\Software\Somoto\
SDP
uid = "{UID}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
sdp
(Default) = "URL:SDP Protocol"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
sdp
URL Protocol = ""

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
sdp\shell\open\
command
(Default) = ""%AppDataLocal%\FilesFrog Update Checker\update_checker.exe"/protocol %1"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\ProtocolExecute\sdp
WarnOnOpen = "0"

HKEY_CURRENT_USER\Software\Somoto\
SDP
nc = "{hex value}"

HKEY_CURRENT_USER\Software\Somoto\
SDP
flags = "36"

Other Details

This Potentially Unwanted Application connects to the following possibly malicious URL:

• http://{BLOCKED}k.{BLOCKED}date.com/get_list?uid={UID}&muid={UID}&user_interval=24&v=4.3.0&c=0&affid=filesfrogvisible&manual=1&t=0