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 files:
- %Application Data%\g1oOP77
(Note: %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 and 7.)
It drops the following copies of itself into the affected system:
- %Application Data%\av.exe
(Note: %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 and 7.)
Autostart Technique
This Trojan employs registry shell spawning to ensure its execution when certain file types are accessed by adding the following entries:
HKEY_CLASSES_ROOT\secfile\shell\
open\command
(Default) = ""%Application Data%\av.exe" /START "%1" %*"
HKEY_CLASSES_ROOT\.exe\shell\
open\command
(Default) = ""%Application Data%\av.exe" /START "%1" %*"
Other System Modifications
This Trojan adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows
Identity = "{hex value}"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\DomainProfile
EnableFirewall = "0"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\DomainProfile
DoNotAllowExceptions = "0"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\DomainProfile
DisableNotifications = "1"
It modifies the following registry entries:
HKEY_CLASSES_ROOT\.exe
(Default) = "secfile"
(Note: The default value data of the said registry entry is exefile.)
HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
StartMenuInternet\FIREFOX.EXE\shell\
open\command
(Default) = ""%Application Data%\av.exe" /START "%Program Files%\Mozilla Firefox\firefox.exe""
(Note: The default value data of the said registry entry is %Program Files%\Mozilla Firefox\firefox.exe.)
HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
StartMenuInternet\FIREFOX.EXE\shell\
safemode\command
(Default) = ""%Application Data%\av.exe" /START "%Program Files%\Mozilla Firefox\firefox.exe" -safe-mode"
(Note: The default value data of the said registry entry is "%Program Files%\Mozilla Firefox\firefox.exe" -safe-mode.)
HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
StartMenuInternet\IEXPLORE.EXE\shell\
open\command
(Default) = ""%Application Data%\av.exe" /START "%Program Files%\Internet Explorer\iexplore.exe""
(Note: The default value data of the said registry entry is %Program Files%\Internet Explorer\iexplore.exe.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
AntiVirusDisableNotify = "1"
(Note: The default value data of the said registry entry is 0.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
FirewallDisableNotify = "1"
(Note: The default value data of the said registry entry is 0.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
UpdatesDisableNotify = "1"
(Note: The default value data of the said registry entry is 0.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
AntiVirusOverride = "1"
(Note: The default value data of the said registry entry is 0.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
FirewallOverride = "1"
(Note: The default value data of the said registry entry is 0.)
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess
Start = "4"
(Note: The default value data of the said registry entry is 2.)
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
EnableFirewall = "0"
(Note: The default value data of the said registry entry is 1.)
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
DisableNotifications = "1"
(Note: The default value data of the said registry entry is 0.)
Other Details
This Trojan connects to the following possibly malicious URL:
- {BLOCKED}ows-live-care.com
- {BLOCKED}nlive-2010.com
- {BLOCKED}relive.com
- {BLOCKED}dows-live.com
- {BLOCKED}live.com
- {BLOCKED}e-live.com
- {BLOCKED}n-live-2010.com
- {BLOCKED}nlive.com
- {BLOCKED}elive.com
- {BLOCKED}-live.com
- {BLOCKED}d2010.com
- {BLOCKED}ve-care2010.com
- {BLOCKED}care.com
It deletes the initially executed copy of itself
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 terminate files detected as TROJ_KRAP.SMEP
[ Learn More ]
[ back ]
- Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
- If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
- If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.
To terminate the malware/grayware/spyware process:
- Scan your computer with your Trend Micro product and take note of the name of the malware/grayware/spyware detected.
- Open Windows Task Manager.
• For Windows 2000, XP, and Server 2003, Vista, and 7 users, press
CTRL+SHIFT+ESC, then click the Processes tab. - In the list of running programs, locate a malware/grayware/spyware file detected earlier.
- Select the detected files, then press either the End Task or the End Process button, depending on the version of Windows you are using.
- Do the same for the remaining detected malware/grayware/spyware files in the list of running programs.
- To check if the malware/grayware/spyware process has been terminated, close Task Manager, and then open it again.
- Close Task Manager.
Step 3
Restore this modified registry value
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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.
- HKEY_CLASSES_ROOT\secfile\shell\open\command
- HKEY_CLASSES_ROOT\.exe\shell\open\command
To stop the malware/grayware from running when certain files are opened:
- Open Registry Editor.
» For Windows 2000, Windows XP, and Windows Server 2003 users, click Start>Run, type regedit in the text box provided, and then press Enter.
» For Windows Vista and Windows 7 users, click the Start button, type regedit in the Search input field then press Enter. - In the left panel of the Registry Editor window, locate the following registry key(s):
HKEY_CLASSES_ROOT\secfile\shell\open\command&&HKEY_CLASSES_ROOT\.exe\shell\open\command - For each registry key, perform the following:
- In the right panel, locate the registry value:
Default - Check whether its value data its value data is the path and file name of the malware/grayware file.
- If the value data is the malware/grayware file, right-click the Default key and choose Modify to change its value.
- In the Value data input box, delete the existing value and type the default value:
%1 %*
- Close Registry Editor.
Step 4
Delete this registry value
[ Learn More ]
[ back ]
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_CURRENT_USER\Software\Microsoft\Windows
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile
- DoNotAllowExceptions = "0"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile
- DisableNotifications = "1"
To delete the registry value this malware created:
- Open Registry Editor. To do this, click Start>Run, type regedit in the text box provided, then press Enter.
- In the left panel of the Registry Editor window, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>Windows - In the right panel, locate and delete the entry:
Identity = "{hex value}" - In the left panel of the Registry Editor window, double-click the following:
HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>SharedAccess>Parameters>FirewallPolicy>DomainProfile - In the right panel, locate and delete the entry:
EnableFirewall = "0" - Again In the right panel, locate and delete the entry:
DoNotAllowExceptions = "0" - Again In the right panel, locate and delete the entry:
DisableNotifications = "1" - Close Registry Editor.
Step 5
Restore this modified registry value
[ Learn More ]
[ back ]
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_CLASSES_ROOT\.exe
- From: (Default) = "secfile"
To: (Default) = "exefile"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\StartMenuInternet\FIREFOX.EXE\shell\open\command
- From: (Default) = ""%Application Data%\av.exe" /START "%Program Files%\Mozilla Firefox\firefox.exe""
To: (Default) = "%Program Files%\Mozilla Firefox\firefox.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\StartMenuInternet\FIREFOX.EXE\shell\safemode\command
- From: (Default) = ""%Application Data%\av.exe" /START "%Program Files%\Mozilla Firefox\firefox.exe" -safe-mode"
To: (Default) = ""%Program Files%\Mozilla Firefox\firefox.exe" -safe-mode"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\StartMenuInternet\IEXPLORE.EXE\shell\open\command
- From: (Default) = ""%Application Data%\av.exe" /START "%Program Files%\Internet Explorer\iexplore.exe""
To: (Default) = "%Program Files%\Internet Explorer\iexplore.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
- From: AntiVirusDisableNotify = "1"
To: AntiVirusDisableNotify = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
- From: FirewallDisableNotify = "1"
To: FirewallDisableNotify = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
- From: UpdatesDisableNotify = "1"
To: UpdatesDisableNotify = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
- From: AntiVirusOverride = "1"
To: AntiVirusOverride = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
- From: FirewallOverride = "1"
To: FirewallOverride = "0"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess
- From: Start = "4"
To: Start = "2"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
- From: EnableFirewall = "0"
To: EnableFirewall = "1"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
- From: DisableNotifications = "1"
To: DisableNotifications = "0"
To restore the registry value this malware/grayware modified:
- Open Registry Editor. Click Start>Run, type REGEDIT in the text box provided, and then press Enter.
- In the left panel, double-click the following:
HKEY_CLASSES_ROOT>.exe - In the right panel, locate the registry value:
(Default) = "secfile" - Right-click on the value name and choose Modify. Change the value data of this entry to:
(Default) = "exefile" - In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Clients>StartMenuInternet>FIREFOX.EXE>shell>open>command - In the right panel, locate the registry value:
(Default) = ""%Application Data%\av.exe" /START "%Program Files%\Mozilla Firefox\firefox.exe"" - Right-click on the value name and choose Modify. Change the value data of this entry to:
(Default) = "%Program Files%\Mozilla Firefox\firefox.exe" - In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Clients>StartMenuInternet>FIREFOX.EXE>shell>safemode>command - In the right panel, locate the registry value:
(Default) = ""%Application Data%\av.exe" /START "%Program Files%\Mozilla Firefox\firefox.exe" -safe-mode" - Right-click on the value name and choose Modify. Change the value data of this entry to:
(Default) = ""%Program Files%\Mozilla Firefox\firefox.exe" -safe-mode" - In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Clients>StartMenuInternet>IEXPLORE.EXE>shell>open>command - In the right panel, locate the registry value:
(Default) = ""%Application Data%\av.exe" /START "%Program Files%\Internet Explorer\iexplore.exe"" - Right-click on the value name and choose Modify. Change the value data of this entry to:
(Default) = "%Program Files%\Internet Explorer\iexplore.exe" - In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Security Center - In the right panel, locate the registry value:
AntiVirusDisableNotify = "1" - Right-click on the value name and choose Modify. Change the value data of this entry to:
AntiVirusDisableNotify = "0" - Again In the right panel, locate the registry value:
FirewallDisableNotify = "1" - Right-click on the value name and choose Modify. Change the value data of this entry to:
FirewallDisableNotify = "0" - Again In the right panel, locate the registry value:
UpdatesDisableNotify = "1" - Right-click on the value name and choose Modify. Change the value data of this entry to:
UpdatesDisableNotify = "0" - Again In the right panel, locate the registry value:
AntiVirusOverride = "1" - Right-click on the value name and choose Modify. Change the value data of this entry to:
AntiVirusOverride = "0" - Again In the right panel, locate the registry value:
FirewallOverride = "1" - Right-click on the value name and choose Modify. Change the value data of this entry to:
FirewallOverride = "0" - In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>SharedAccess - In the right panel, locate the registry value:
Start = "4" - Right-click on the value name and choose Modify. Change the value data of this entry to:
Start = "2" - In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>SharedAccess>Parameters>FirewallPolicy>StandardProfile - In the right panel, locate the registry value:
EnableFirewall = "0" - Right-click on the value name and choose Modify. Change the value data of this entry to:
EnableFirewall = "1" - Again In the right panel, locate the registry value:
DisableNotifications = "1" - Right-click on the value name and choose Modify. Change the value data of this entry to:
DisableNotifications = "0" - Close Registry Editor.
Step 6
Search and delete this file
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[ back ]
There may be some 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.
- %Application Data%\g1oOP77
To manually delete a malware/grayware file from an affected system:
• For Windows 2000, Windows XP, and Windows Server 2003:
- Right-click Start then click Search....
- In the left panel, click All Files.
- In the Named input box, type the following:
- %Application Data%\g1oOP77
- 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.
• For Windows Vista and Windows 7 users:
- Click Start>Computer.
- In the Search input box, type the following:
- %Application Data%\g1oOP77
- Once located, select the file then press SHIFT+DELETE to delete it.
*Note: Read the following Microsoft page if these steps do not work on Windows 7.
Step 7
Scan your computer with your Trend Micro product to delete files detected as TROJ_KRAP.SMEP. 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.
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