PHP_CSHELL.SMO4
Backdoor:PHP/C99shell.F (Microsoft), PHP.Backdoor.Trojan (Symantec), Backdoor.PHP.C99Shell.ff (Kaspersky)
Windows, Linux/Unix
Threat Type: Backdoor
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
This backdoor may be dropped by other malware.
It executes commands from a remote malicious user, effectively compromising the affected system.
TECHNICAL DETAILS
Arrival Details
This backdoor may be dropped by other malware.
Backdoor Routine
This backdoor executes the following commands from a remote malicious user:
- change file permissions
- copy a directory
- copy file
- delete file
- download a file
- dump the contents of a MySQL database
- execute PHP code
- execute a shell command
- list all running processes
- list directory contents
- move a directory
- query from a MySQL database
- remove a directory
- search a file
- send an email
- upload a file
Download Routine
This backdoor downloads an updated copy of itself from the following website(s):
- http://{BLOCKED}o.ru/config/fx29sh_update.php
- http://{BLOCKED}ef.ru/config/fx29sh_update.php
- http://{BLOCKED}ef.ru/cyberz/fx29sh_update.php
- http://{BLOCKED}l.com/fx29sh_update.php
NOTES:
The backdoor commands are specified in the parameters of this PHP script.
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
Scan your computer with your Trend Micro product to delete files detected as PHP_CSHELL.SMO4. 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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