BKDR_VAWTRAK.FKM
Backdoor:Win32/Vawtrak.D (Microsoft), Win32/PSW.Papras.CX trojan (NOD32), W32/Papras.CX!tr.pws (Fortinet), TR/PSW.Papras.CX.9 (Antivir)
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 may be dropped by other malware.
TECHNICAL DETAILS
246,216 bytes
DLL
Yes
16 Apr 2014
Arrival Details
This backdoor may be dropped by other malware.
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 file name} = "regsvr32.exe "{malware path and file 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_CLASSES_ROOT\CLSID\{CLSID 2}
{random} = "{hex value}"
HKEY_CURRENT_USER\Software\Classes\
CLSID\{CLSID 1}
#cert = "{hex value}"
HKEY_CURRENT_USER\Software\Classes\
CLSID\{CLSID 2}
{random} = "{hex value}"
Other Details
This backdoor connects to the following possibly malicious URL:
- http://{BLOCKED}ix.com/forumdisplay.php?fid={random digit}
- http://{BLOCKED}ag.com/forumdisplay.php?fid={random digit}
- http://{BLOCKED}d.com/forumdisplay.php?fid={random digit}
- http://{BLOCKED}on.com/forumdisplay.php?fid={random digit}
- http://{BLOCKED}.{BLOCKED}.233.38/update?v=47
SOLUTION
9.700
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
Restart in Safe Mode
Step 3
Delete this registry key
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\CLSID
- {CLSID 1}
- {CLSID 1}
- In HKEY_CLASSES_ROOT\CLSID
- {CLSID 2}
- {CLSID 2}
- In HKEY_CURRENT_USER\Software\Classes\CLSID
- {CLSID 1}
- {CLSID 1}
- In HKEY_CURRENT_USER\Software\Classes\CLSID
- {CLSID 2}
- {CLSID 2}
Step 4
Delete this registry value
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\CurrentVersion\Run
- {malware file name} = "regsvr32.exe "{malware path and file name}""
- {malware file name} = "regsvr32.exe "{malware path and file name}""
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
- NoProtectedModeBanner = "1"
- NoProtectedModeBanner = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
- TabProcGrowth = "0"
- TabProcGrowth = "0"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3
- 2500 = "3"
- 2500 = "3"
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_VAWTRAK.FKM. 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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