PHP_WEBSHELL.XA
Backdoor:PHP/WebShell.J (Microsoft); PHP.Backdoor.Trojan (Symantec); Backdoor.PHP.WebShell.hh (Kaspersky); PHP/WebShell.NAF!tr (Fortinet); PHP/WebShell.NAF (ESET-NOD32); PHP:Shell-HD [Trj] (Avast)
Windows
Threat Type: Backdoor
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This backdoor may arrive bundled with malware packages as a malware component. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites. It may be hosted on a website and run when a user accesses the said website.
It requires its main component to successfully perform its intended routine.
TECHNICAL DETAILS
Arrival Details
This backdoor may arrive bundled with malware packages as a malware component.
It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It may be hosted on a website and run when a user accesses the said website.
Other Details
This backdoor requires its main component to successfully perform its intended routine.
NOTES:
This backdoor is a web panel that is capable of manipulating commands to be executed on affected machines.
SOLUTION
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
Close all opened browser windows
Step 3
Scan your computer with your Trend Micro product to delete files detected as PHP_WEBSHELL.XA. 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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