Backdoors are server-side malicious scripts which are intended to perpetrate malicious acccess to the server. The typical example of such backdoors are various File Managers, Web Shells, tools for bypassing admin login or various one-purpose scripts allowing the attacker to upload and run another type of malicious scripts. The payload is PHP based, thus intended for server-side use and the payload is executed directly on the server, while the site is loaded. Only the payload result (such as Web Shell environment) is visible in the browser, not the malicious code itself. It's very common, that backdoors don't have any visible signs in the site code and it's impossible to detect them by accessing the infected site from outside. Server level analysis is necessary in case of infection by this type of malware.The typical example of such backdoors are various File Managers, Web Shells, tools for bypassing admin login or various one-purpose scripts allowing the attacker to upload and run another type of malicious scripts. The payload is PHP based, thus intended for server-side use and the payload is executed directly on the server, while the site is loaded. Only the payload result (such as Web Shell environment) is visible in the browser, not the malicious code itself. It's very common, that backdoors don't have any visible signs in the site code and it's impossible to detect them by accessing the infected site from outside. Server level analysis is necessary in case of infection by this type of malware.
db_shell is special kind of web-shell aimed on the work with the database. Using such shell, the attacker can view and modify victim's database from the browser. It is usually used for injecting another kind of backdoor to the DB for later use.
Affecting
Any PHP based web site (often through outdated WordPress, Joomla, osCommerce, Magento, Drupal and stolen passwords).
Cleanup
Cleanup is done by deleting the malicious file, which can be found in your system by searching for the dump code below inside your files. Reviewing access logs for non-expected HTTP POSTs can point out the possible infected files.
You can also sign up with us and let our team remove the malware for you.
Dump
Nice example of functions which can be found in malware of this type:
function logon() {
function logon_submit() {
function echoQueryResult() {
function listDatabases() {
function createDatabase() {
function dropDatabase() {
function listTables() {
function createTable() {
function dropTable() {
function viewSchema() {
function manageField( $cmd ) {
function manageField_submit( $cmd ) {
function dropField() {
function viewData( $queryStr ) {
function manageData( $cmd ) {
function manageData_submit( $cmd ) {
function deleteData() {
function fetch_table_dump_sql($table)
function dump() {
function utils() {
function footer_html() {