BKDR_VAWTRAK.SMW1
Backdoor:Win32/Vawtrak.F (Microsoft), Gen:Heur.Vawtrak.1 (BitDefender)
Windows
![](/vinfo/imgFiles/legend.jpg)
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
265520 bytes
DLL
Yes
30 Jul 2015
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.
Installation
This backdoor drops the following files:
- %All Users Profile%\{random 1}\{random 2}.{3 random characters}
(Note: %All Users Profile% is the All Users folder, where it usually is C:\Documents and Settings\All Users on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData 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.)
Other System Modifications
This backdoor adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
TabProcGrowth = 0
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
NoProtectedModeBanner = 1
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\3
2500 = 3
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows Search\Gather\Windows\
SystemIndex\StreamLog
CurrentStreamLog = 8
HKEY_CURRENT_USER\Software\{CLSID}
{random} = {hex values}
HKEY_CURRENT_USER\Software\{CLSID}
{random} = {hex values}
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{random 1} = regsvr32.exe "%All Users Profile%\{random 1}\{random 2}.{3 random characters}"
Other Details
This backdoor connects to the following possibly malicious URL:
- http://{BLOCKED}dgy.ru/spreadsheets/00000385/96409e35-00/edit#gid={value}
- http://{BLOCKED}dgy.ru/spreadsheets/00000385/96409e35-01/edit#gid={value}
- http://{BLOCKED}ame.com/spreadsheets/00000385/96409e35-00/edit#gid={value}
- http://{BLOCKED}ame.com/spreadsheets/00000385/96409e35-01/edit#gid={value}
- http://{BLOCKED}eal.ru/spreadsheets/00000385/96409e35-00/edit#gid={value}
- http://{BLOCKED}eal.ru/spreadsheets/00000385/96409e35-01/edit#gid={value}
- http://{BLOCKED}nug.su/spreadsheets/00000385/96409e35-00/edit#gid={value}
- http://{BLOCKED}snug.su/spreadsheets/00000385/96409e35-01/edit#gid={value}