Spam-Attacks (possibly Dark Mailer) through abused FTP account within 1s

Written by - 0 comments

Published on - Listed in Internet PHP Linux Hacks Mail

This weekend I came across a rather new method to send spam e-mails, at least new to me so far. 

A shared hosting ftp account was abused (password probably gotten through a trojan) to send spam e-mails. That wouldn't be something surprising new, but the timely manner in which the script was uploaded and executed, is definitely worth mentioning it.

In the FTP logs I found the following entries:

Sat Sep 01 01:12:49 2012 0 408 /var/www/someweb/html/chk_mailto.php a _ i r someweb ftp 0 * c
Sat Sep 01 01:12:49 2012 0 408 /var/www/someweb/html/chk_mailto.php a _ d r someweb ftp 0 * c

Note that the file chk_mailto.php was uploaded AND deleted within the same second!

But before the file was deleted, it was executed by browser: - - [01/Sep/2012:01:12:49 +0200] "GET /chk_mailto.php HTTP/1.1" 200 2 "-" "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0)"

Due to the very short living time of the script, it is nearly impossible to find it. Additionally only a few spams are sent out (or are sent through open relay servers) which makes it difficult to trace it in the mail logs as well.

Update September 4th 2012:
Each time such an uploaded file was executed in browser, a new process called 'perl' was started on the server which created smtp connections to foreign webservers and continued to run in the background.

Add a comment

Show form to leave a comment

Comments (newest first)

No comments yet.

RSS feed

Blog Tags:

  AWS   Android   Ansible   Apache   Apple   Atlassian   BSD   Backup   Bash   Bluecoat   CMS   Chef   Cloud   Coding   Consul   Containers   CouchDB   DB   DNS   Database   Databases   Docker   ELK   Elasticsearch   Filebeat   FreeBSD   Galera   Git   GlusterFS   Grafana   Graphics   HAProxy   HTML   Hacks   Hardware   Icinga   Influx   Internet   Java   KVM   Kibana   Kodi   Kubernetes   LVM   LXC   Linux   Logstash   Mac   Macintosh   Mail   MariaDB   Minio   MongoDB   Monitoring   Multimedia   MySQL   NFS   Nagios   Network   Nginx   OSSEC   OTRS   Office   PGSQL   PHP   Perl   Personal   PostgreSQL   Postgres   PowerDNS   Proxmox   Proxy   Python   Rancher   Rant   Redis   Roundcube   SSL   Samba   Seafile   Security   Shell   SmartOS   Solaris   Surveillance   Systemd   TLS   Tomcat   Ubuntu   Unix   VMWare   VMware   Varnish   Virtualization   Windows   Wireless   Wordpress   Wyse   ZFS   Zoneminder