- Threat Encyclopedia
- Malware
- BKDR_MEVADE.B
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
Downloaded from the Internet, Dropped by other malware
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.
2,662,912 bytes
EXE
Yes
28 Aug 2013
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 adds the following folders:
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).. %System% is the Windows system folder, which is usually C:\Windows\System32.)
It drops the following component file(s):
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
It drops the following copies of itself into the affected system:
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
Autostart Technique
This backdoor registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\tor
Type = "10"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\tor
Start = "2"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\tor
ImagePath = "%Program Files%\Tor\tor.exe"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\tor
DisplayName = "Tor Win32 Service"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\tor
ObjectName = "NT AUTHORITY\LocalService"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\tor
Description = "Provides an anonymous Internet communication system"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Windows Internet Name Service
Type = "10"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Windows Internet Name Service
Start = "2"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Windows Internet Name Service
ImagePath = "%System%\config\systemprofile\Local Settings\Application Data\Windows Internet Name Service\wins.exe"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Windows Internet Name Service
DisplayName = "Windows Internet Name Service"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Windows Internet Name Service
Group = "netsvcs"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Windows Internet Name Service
ObjectName = "LocalSystem"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Windows Internet Name Service
Description = "Provides Internet Name Service"
Other System Modifications
This backdoor adds the following registry keys:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\tor
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Windows Internet Name Service
Backdoor Routine
This backdoor connects to the following URL(s) to send and receive commands from a remote malicious user:
NOTES:
This backdoor drops a TOR client %Program Files%\Tor\tor.exe.
It uses the following parameters to perform routine:
The malware will attempt to connect to the following Onion Addresses via TOR Network:
9.300
10.260.04
28 Aug 2013
10.261.00
29 Aug 2013
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
Search and delete these folders
Step 4
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.
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_MEVADE.B. 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.