BKDR_ZZSLASH.AP
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Backdoor
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
Dropped by other malware, Downloaded from the Internet
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.
TECHNICAL DETAILS
259,277 bytes
DLL
Yes
25 Apr 2012
Compromises system security, Connects to URLs/IPs
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.
SOLUTION
9.200
8.938.02
25 Apr 2012
8.939.00
26 Apr 2012
Step 1
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
Step 2
Restart in Safe Mode, and then 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_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
- .Net CLR
- .Net CLR
Step 3
Scan your computer with your Trend Micro product to delete files detected as BKDR_ZZSLASH.AP. 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.
Step 4
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_ZZSLASH.AP. 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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