Tips for Fixing A Hacked WordPress Site - Vlad Lasky

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Tips For Fixing a Hacked WordPress Site

Vladimir Lasky

http://wpexpert.com.au/

WordCamp Sydney 2016

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What Your Client Wishes They Had

A Time Machine

Hindsight

Website & Database Backups

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General Recovery Strategy

Assess The Damage

Disinfect Site

Replace Data

Recover Data

Secure Website

Check For Reinfection

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What You Need

WordPress Admin Account Details

cPanel Login

Secure Shell (SSH) Access

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Files That Are Often Infected:

.htaccess

index.php

index.html

wp-config.php

Theme templates

Plugin Files

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Files That Are Often Infected:

Anywhere within the installation:

– .htaccess

– index.php

– index.html

– wp-config.php

Within wp-content

– Theme templates

– Plugin Files

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Common Infectious Payloads:

Shell code (a back door for the hacker)

– Often appears as strangely-named PHP files

Spam to be shown to site visitors

Javascript code to pull in content from external

sites or to attempt to trigger vulnerabilities in the

visitor’s web browser

Boasts about the attacker’s hacking prowess

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Finding Files Modifed Between Two Dates

find . -type f -newermt 2010-10-07 ! -newermt

2014-10-08

find . -type f -newermt "2014-10-08 10:17:00" ! -

newermt "2014-10-08 10:53:00"

find srcdir -type f -newermt 2014-08-31 ! -

newermt 2014-09-30 -exec mv -i {} destdir/ \;

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Searching For Obfuscated Code

Searching for obfuscated code

– base64_decode

– gzinflate

– eval

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Identifying The Infection

Sucuri Site Check

Google Webmaster Tools

If website still accessible, vulnerability scanning

plugins like Wordfence (or similar plugins)

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Recovering Site Content

Old Site Backups

WordPress Export

Google's Cache of the site

Archive.org (also called Internet Archive or

Wayback Machine)

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Conclusion

Slides from My Previous Security Talks:

– Wordcamp GC 2011:

• http://slidesha.re/tr2XA5

• Covers the “Three Pillars of Security”, the aims of attackers and other WordPress security

plugins

– WordCamp Sydney 2012:

• http://www.slideshare.net/wordcampsyd/securing-your-wordpress-website-vlad-lasky-

wordcamp-sydney-2012

Questions and Comments:

– http://wpexpert.com.au/contact-us/