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F-Secure Malware Information Pages: Trojan-Spy:W32/Lydra.DT
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Summary
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| Trojan-Spy:W32/Lydra.DT is a Trojan-Spy that monitors user activity on the infected machine. |
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Disinfection
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Automatic Disinfection
Usually standalone malware (backdoors, worms, trojans, etc.) is automatically removed by F-Secure Anti-Virus (FSAV) starting from version 5.40. Malware files get automatically renamed by FSAV, so they can not be started any more. In some rare cases, when automatic disinfection is not possible, a user can select disinfection action by him/herself to make FSAV rename or delete an infected file. In some special cases, it is recommended to use specific disinfection tools provided by F-Secure. They can be downloaded from our ftp site:
ftp://ftp.f-secure.com/anti-virus/tools/
F-Secure Anti-Virus can be purchased from our web shop or from our authorized distributors. A trial version F-Secure Anti-Virus, limited to 30 days, can be downloaded from our website:
http://www.f-secure.com/download-purchase/
All the latest versions of FSAV can download anti-virus database updates automatically. However, these updates can be also downloaded and installed manually from our web or ftp sites:
http://www.f-secure.com/download-purchase/updates.shtml
Manual Disinfection
To manually disinfect standalone malware (backdoors, worms, trojans, etc.) it is usually enough to delete all infected files from a computer and to restart it. Active malware files are usually locked by operating system so different disinfection approaches are required for different operating systems.
Please note that manual disinfection is a risky process, so it is recommended only for advanced users.
If Windows 95, 98 and ME operating system is used, it is recommended to restart a computer from a bootable system diskette and to delete an infected file from command prompt. For example, if a malicious file named ABC.EXE is located in Windows folder, it is usually enough to type the following command at command prompt:
DEL C:\WINDOWS\ABC.EXE
and to press Enter. After that an infected file will be gone. If Windows NT, 2000 or XP is used, a malicious file has to be renamed with a different extension (for example .VIR) and then a system has to be restarted. After restarting, the renamed malicious file will no longer be active and it can be easily to delete manually.
Malware Disinfection Tools
F-Secure provides disinfection tools for certain malware. These tools can be downloaded from this webpage:
http://www.f-secure.com/download-purchase/tools.shtml
ftp://ftp.f-secure.com/anti-virus/tools/
Windows System Restore Issues
If Windows ME or XP is used, it is recommended to disable System Restore feature of these operating systems to prevent a computer from re-infection by an already removed malware. The fact is that System Restore feature of these operating systems might save an infected file into the special folder and copy it back to a hard drive it every time it has been renamed or deleted by F-Secure Anti-Virus or by a user. Instructions on how to disable System Restore feature are here:
Windows ME:
http://www.f-secure.com/v-descs/sfc_dis.shtml
Windows XP:
http://www.f-secure.com/v-descs/sfc_dis1.shtml
It is recommended to re-enable System Restore after disinfection in order to restore stable system configuration if any crash or incompatibility issue occurs in the future.
Failed Disinfection
In some cases, F-Secure Anti-Virus might not disinfect a system automatically. In this case, please visit our Support pages:
http://support.f-secure.com/enu/home/virusproblem/howtoclean/ |
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Detailed Description
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Trojan-Spy:W32/Lydra.DT is a Trojan-Spy that monitors user activities in the infected machine.
It stays active in Windows memory and starts keylogging (recording keyboard and mouse inputs). It stores the recorded keystrokes data and computer hardware and software information for later submission and sends it to the malware author via e-mail.
It creates these files upon execution:
- %windir%\mui\rctfd.sys
- %windir%\syswin.exe
- %windir%\lsassv.exe
- %windir%\msrpc.exe
- %windir%\calc.exe
- %windir%\regedit2.exe
- %allusersprofile%\Start Menu\Programs\Startup\AdobeGammaLoader.scr
It also modifies some Windows files found in the %windir% folder.
Adds itself as a system service and puts multiple registry run entries to execute itself when the system starts.
Changes to the registry follows:
- HKLM\SOFTWARE\Classes\CLSID\{65D5AFFB-D4EF-49AA-GFFG-5DA5E12E300A}
ThisEXE = %cwd%\wokiscan.exe - HKLM\SOFTWARE\Classes\CLSID\{65D5AFFB-D4EF-49AA-GFFG-5DA5E12E300A}
VerProg = 0000009B - HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
syswin = c:\windows\syswin.exe - HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run
syswin = c:\windows\syswin.exe - HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
syswin = c:\windows\syswin.exe - HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
lsassv = c:\windows\lsassv.exe - HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run
msrpc = c:\windows\msrpc.exe - HKLM\SYSTEM\CurrentControlSet\Services\syswin
DependOnGroup = - HKLM\SYSTEM\CurrentControlSet\Services\syswin
DependOnService = RpcSs - HKLM\SYSTEM\CurrentControlSet\Services\syswin
Description = This service manages TCP/IP packets at Internet - HKLM\SYSTEM\CurrentControlSet\Services\syswin
DisplayName = TCPIP route manager - HKLM\SYSTEM\CurrentControlSet\Services\syswin
Group = PlugPlay - HKLM\SYSTEM\CurrentControlSet\Services\syswin
ObjectName = LocalSystem - HKLM\SYSTEM\CurrentControlSet\Services\syswin
ImagePath = c:\windows\syswin.exe - HKLM\SYSTEM\CurrentControlSet\Services\syswin
ErrorControl = 00000001 - HKLM\SYSTEM\CurrentControlSet\Services\syswin
PlugPlayServiceType = 00000003 - HKLM\SYSTEM\CurrentControlSet\Services\syswin
Start = 00000002 - HKLM\SYSTEM\CurrentControlSet\Services\syswin
Type = 00000120 - HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
%cwd%\wokiscan.exe = %cwd%\wokiscan.exe:*:Enabled:System Update
Trojan-Spy:W32/Lydra.DT also collects e-mail addresses found in files with pre-defined name extensions from the infected machine's available drives. It is also able to terminate security related processes and services.
It uses either its built-in SMTP engine or MAPI to send the encrypted stolen information via e-mail.
smtp server : smtp.mail.ru
email address : johnhayward843@yahoo.co.uk and nfd984@rambler.ru |
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F-Secure Corporation |
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Last Modified: August 30, 2007
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