Win32/Remtasu [Threat Name]
| Detection created | 2011-04-20 |
| World activity peak | 2017-03-27 (0.23 %) |
Short description
Win32/Remtasu is a trojan that steals sensitive information.
Installation
When executed, the trojan copies itself in some of the the following locations:
- %appdata%\%variable1%\%variable2%.exe
- %programfiles%\%variable1%\%variable2%.exe
- %system%\%variable1%\%variable2%.exe
- %temp%\%variable1%\%variable2%.exe
- %windir%\%variable1%\%variable2%.exe
The trojan may set the following Registry entries:
- [HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run]
- "HKLM" = "%malwarefilepath%"
- [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run]
- "HKCU" = "%malwarefilepath%"
- [HKEY_LOCAL_MACHINE\Software\Microsoft\Active Setup\Installed Components\{%variable5%}]
- "StubPath" = "%malwarefilepath% restart"
- [HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce]
- "Server" = "%malwarefilepath%"
- [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce]
- "Server" = "%malwarefilepath%"
- [HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Windows]
- "Load" = "%malwarefilepath%"
- [HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows]
- "Load" = "%malwarefilepath%"
- [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
- "Shell" = "explorer.exe %malwarefilepath%"
- [HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
- "Shell" = "explorer.exe %malwarefilepath%"
- [HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run]
- "Server" = "%malwarefilepath%"
- [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run]
- "Server" = "%malwarefilepath%"
This causes the trojan to be executed on every system start. The following Registry entries are created:
- [HKEY_CURRENT_USER\Software\%variable3%]
- "Mutex" = "%variable4%"
- "LastSize" = "%variable5%"
- "ServerStarted" = "%variable6%"
- "ServerName" = "%malwarefilepath%"
A string with variable content is used instead of %variable1-6% .
The trojan launches the following processes:
- explorer.exe
- svchost.exe
- %defaultbrowser%
The trojan creates and runs a new thread with its own code within these running processes.
Information stealing
Win32/Remtasu is a trojan that steals sensitive information.
It can execute the following operations:
- steal information from the Windows clipboard
- log keystrokes
The collected information is stored in the following file:
- %appdata%\Microsoft\Windows\%variable%.dat
- %appdata%\%variable%.dat
A string with variable content is used instead of %variable% .
The trojan attempts to send gathered information to a remote machine. The FTP protocol is used.
Other information
The trojan contains an URL address.
It tries to download the other part of the infiltration from the address. The HTTP protocol is used.
The file is stored in the following location:
- %appdata%\Microsoft\Windows\%variable%.xtr
The file is executed as a thread in the folowing process:
- %malwarefilepath%
The trojan may create the following files:
- %appdata%\Microsoft\Windows\%variable%.cfg
A string with variable content is used instead of %variable% .
The trojan may set the following Registry entries:
- [HKEY_CURRENT_USER\SOFTWARE]
- "FakeMessage" = "OK"
Threat Variants with Description
| Threat Variant Name | Date Added | Threat Type | |
| Win32/Remtasu.Y | 2012-02-08 | trojan | |
| Win32/Remtasu.A | 2011-04-20 | trojan |