BKDR_ZZSLASH.AP

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.

It does not have any propagation routine.

It opens a random port to allow a remote user to connect to the affected system. Once a successful connection is established, the remote user executes commands on the affected system. It executes commands from a remote malicious user, effectively compromising the affected system. However, as of this writing, the said sites are inaccessible.

It does not drop any other file.

It does not have any downloading capability.

It does not have any proxy server routine.

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 is injected into the following processes running in memory:

• SVCHOST.EXE

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\.Net CLR
Type = "110"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\.Net CLR
Start = "2"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\.Net CLR
ErrorControl = "1"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\.Net CLR
ImagePath = "%SystemRoot%\System32\svchost.exe -k ".Net CLR"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\.Net CLR
DisplayName = "Microsoft .Net Framework COM+ Support"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\.Net CLR
ObjectName = "LocalSystem"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\.Net CLR
Description = "Microsoft .NET and Windows XP COM+ Integration with SOAP"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\.Net CLR\Parameters
ServiceDll = "{Malware Path and File Name}"

Propagation

This backdoor does not have any propagation routine.

Backdoor Routine

This backdoor opens a random port to allow a remote user to connect to the affected system. Once a successful connection is established, the remote user executes commands on the affected system.

It executes the following commands from a remote malicious user:

• Capture Audio
• Capture Image
• Capture Video
• Logs Keystrokes
• Manage Files
• Manage Kernel
• Perform Remote Shell
• Spying the Screen

It connects to the following URL(s) to send and receive commands from a remote malicious user:

• {BLOCKED}d.8800.org

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

Dropping Routine

This backdoor does not drop any other file.

Download Routine

This backdoor does not have any downloading capability.

Proxy Server Routine

This backdoor does not have any proxy server routine.

NOTES:

It does not have rootkit capabilities.

It does not exploit any vulnerability.