TROJ_KOVTER.CP

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.

It deletes registry entries, causing some applications and programs to not function properly.

However, as of this writing, the said sites are inaccessible. It deletes the initially executed copy of itself.

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:

• "%AppDataLocal%\{random 1}\{random 1}.exe"

(Note: %AppDataLocal% is the Application Data folder found in Local Settings, where it is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
{random 1} = "%AppDataLocal%\{random 1}\{random 1}.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
{random 1} = "%AppDataLocal%\{random 1}\{random 1}.exe"

Other System Modifications

This Trojan adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\{random key 1}

HKEY_LOCAL_MACHINE\SOFTWARE\{random key 2}

HKEY_CURRENT_USER\Software\{random key 1}

HKEY_CURRENT_USER\Software\{random key 2}

It adds the following registry entries:

HKEY_CURRENT_USER\Software\{random key 1}
1 = "%AppDataLocal%\{random 1}\{random 1}.exe"

HKEY_CURRENT_USER\Software\{random key 1}
2 = "{random values}"

HKEY_CURRENT_USER\Software\{random key 1}
3 = "{random values}"

HKEY_CURRENT_USER\Software\{random key 1}
4 = "{random values}"

HKEY_CURRENT_USER\Software\{random key 1}
7 = "{random key 2}"

HKEY_LOCAL_MACHINE\SOFTWARE\{random key 1}
1 = "%AppDataLocal%\{random 1}\{random 1}.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\{random key 1}
2 = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\{random key 1}
3 = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\{random key 1}
4 = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\{random key 1}
7 = "{random key 2}"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\Safer\
CodeIdentifiers\0\Paths\
{GUID}
ItemData = "{path of installed AV or Virtual Application }"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\Safer\
CodeIdentifiers\0\Paths\
{GUID}
SaferFlags = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows NT\SystemRestore
DisableConfig = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows NT\SystemRestore
DisableSR = "1"

It deletes the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\SafeBoot\Minimal\
sermouse.sys
(Default) = "Driver"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\SafeBoot\Minimal\
PlugPlay
(Default) = "Service"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\SafeBoot\Minimal\
vga.sys
(Default) = "Driver"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\SafeBoot\Minimal\
{GUID}
(Default) = "CD-ROM Drive"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\SafeBoot\Minimal\
{GUID}
(Default) = "Keyboard"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\SafeBoot\Minimal\
{GUID}
(Default) = "Mouse"

Other Details

This Trojan connects to the following possibly malicious URL:

• {BLOCKED}mini.ru/upload.php

However, as of this writing, the said sites are inaccessible.

It deletes the initially executed copy of itself