BKDR_VAWTRAK.YUH
Backdoor:Win32/Vawtrak.F (Microsoft), Trojan-Dropper.Win32.Dapato.edqb (Kaspersky), Trojan-Spy.Zbot (Ikarus), W32/Papras.DE!tr.pws (Fortinet)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
Threat Type: Backdoor
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
TECHNICAL DETAILS
420,864 bytes
EXE
03 Jul 2014
Arrival Details
This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Autostart Technique
This backdoor adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{malware filename} = "regsvr32.exe "{malware path}\{malware filename}.{malware extension name}""
Other System Modifications
This backdoor adds the following registry keys:
HKEY_CLASSES_ROOT\CLSID\{CLSID 1}
HKEY_CLASSES_ROOT\CLSID\{CLSID 2}
HKEY_CURRENT_USER\Software\Classes\
CLSID\{CLSID 1}
HKEY_CURRENT_USER\Software\Classes\
CLSID\{CLSID 2}
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
NoProtectedModeBanner = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
TabProcGrowth = "0"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\3
2500 = "3"
HKEY_CLASSES_ROOT\CLSID\{CLSID 1}
#cert = "{hex value}"
HKEY_CURRENT_USER\Software\Classes\
CLSID\{CLSID 1}
#cert = "{hex value}"
HKEY_CLASSES_ROOT\CLSID\{CLSID 2}
{CLSID 3} = "{hex value}"
HKEY_CURRENT_USER\Software\Classes\
CLSID\{CLSID 2}
{CLSID 3} = "{hex value}"