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Wordfence Weekly August 28 2019 – September 03 2019

A weekly report of noteworthy threat data by the Defiant threat intelligence team.

Notable Vulnerabilities

Name: Formidable Forms <= 4.02.01 - Improper Output Sanitization
Description: Patched version improved output sanitization on form data, suggesting potential for abuse in earlier versions.
Type: A1 – Injection

Most Common New Infections

Malware samples identified on the greatest count of newly infected sites.

MD5 Signature Description Example File Names
CEC9A529B43D84F0A0E3624372CD9C51 Backdoor:PHP/WP-VCD.5409 Infected core file, triggers execution of another malicious script. post.php
75234791B9CA71A16FC8432BE4F6A5D0 Backdoor:PHP/wp-vcd.5476 Backdoor associated with SEO spam injections. wp-vcd.php
CBF518A7A6722D9C7A9086E57E062737 Backdoor:PHP/wp-vcd.5476 Backdoor associated with SEO spam injections. wp-vcd.php
380FA777B8C37FB60811E5972391261B Suspicious:PHP/evalB64.4068 WebShellOrb PHP webshell. wp-update.php, ob.php, aw.php, and others.
3F60851C9F7E37C0D8817101D2212C68 Suspicious:PHP/evalB64.4068 Obfuscated PHP backdoor. number.php, hour.php, country.php, and others.

IPs Attacking Most Sites

Rank Prev. IP Address ASN Country
1 3 84.246.231.100 35393 (CTS Computers and Telecommunications Systems SAS) Spain ES
2 8 217.182.95.250 16276 (OVH SAS) France FR
3 — 34.67.197.193 15169 (Google LLC) United States US
4 — 34.219.38.243 16509 (Amazon.com, Inc.) United States US
5 — 178.128.193.158 14061 (DigitalOcean, LLC) Germany DE
6 6 192.99.38.186 16276 (OVH SAS) Canada CA
7 — 132.148.19.69 26496 (GoDaddy.com, LLC) United States US
8 — 37.122.209.28 20738 (Host Europe GmbH) United Kingdom GB
9 — 195.114.211.98 57286 (Gigas Hosting S.A.) Spain ES
10 — 153.126.194.159 7684 (SAKURA Internet Inc.) Japan JP

New Tracked Domains

Domain Name Date Added Current Status Notes
quahotluon.com 08/31/2019 Up Hosting malicious scripts referenced in malware samples.
phimmoinhat.online 08/31/2019 Up Hosting malicious scripts referenced in malware samples.

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Recent Issues

Wordfence Weekly September 11 2019 – September 17 2019

In this Wordfence Weekly we share five new domains which have been added to our blacklist for their association with spamming and malvertising. A slightly modified variant of WP-VCD's wp-tmp.php script reaches the top of the malware chart, while the rest has remained stable from previous weeks. Lastly, several new IP addresses have reached the top ten attacking hosts during a week where the Wordfence firewall detected a notable surge in activity.

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Wordfence Weekly September 04 2019 – September 10 2019

This edition of Wordfence Weekly includes a number of vulnerabilities recently patched in WordPress core version 5.2.3. All WordPress users are recommended to ensure this security patch has been applied as soon as possible. WP-VCD and related malware still hold the top most common new infections, while most of the top attacking IP addresses have rotated out.

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Wordfence Weekly August 21 2019 – August 27 2019

This week's Wordfence Weekly sees a continued trend of new WP-VCD infections taking over the Most Common New Infections chart. In Attacking IPs, the top two addresses from last week retain their positions while the rest of the list contains new IPs from a variety of hosts. Additionally, we're tracking some new malvertising domains as well as a MySQL host used by attackers taking over unfinished WordPress installs.

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Wordfence Weekly August 14 2019 – August 20 2019

In this Wordfence Weekly, we've got a Directory Traversal vulnerability in the highly popular WP Fastest Cache plugin. In the malware rankings, we see a number of samples associated with the WP_VCD SEO spam campaign as well as more PHP backdoor scripts. Also, this week's attacking IP rankings have returned to a typical spread of activity, with attacks from OVH SAS and DigitalOcean servers controlling the board.

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Wordfence Weekly August 07 2019 – August 13 2019

The prevalence of attacks from US-based host QuadraNet continues in this edition of Wordfence Weekly. Additionally, a few new noteworthy vulnerabilities have popped up, which are each seeing their own attacks. In particular, we've begun tracking some new domains associated with malicious redirects.

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Wordfence Weekly July 31 2019 – August 06 2019

This week, the list of the top IPs attacking WordPress sees a sudden appearance of seven addresses from the US-based hosting provider QuadraNet Enterprises LLC. In the tracked domains, we've added some illegitimate download sites referenced in malicious samples discovered by our site cleaning team.

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Wordfence Weekly July 24 2019 – July 30 2019

July's final Wordfence Weekly sees some news items regarding Marcus Hutchins' sentencing and a data breach from Capital One. Under the week's new tracked domains, we list xn--google-analytcs-xpb[.]com, a punycode domain masquerading as a Google Analytics domain when decoded. Malware trends and common attacking IPs remain stable, though OVH SAS's longtime domination of the attacking IP rankings continues to wane.

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Wordfence Weekly July 17 2019 – July 23 2019

This week's Wordfence Weekly shows an increase in US-based attack traffic, including an IP from popular web host GoDaddy. We're also seeing a rise in infected sites where the PHP webshell "Ironshell" is present. In the news, Equifax is slated to pay a settlement following its 2017 data breach and the nation of Kazakhstan is attempting to man-in-the-middle the internet traffic of its citizens.

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Wordfence Weekly July 10 2019 – July 16 2019

This week saw an uptick in malicious network activity from Chinese hosts, while IPs associated with OVH SAS have begun to pull back. We've begun tracking new domains associated with malvertising campaigns, while familiar backdoor scripts remain the top new infections of the week. In the news, an Instagram access control flaw could have allowed hackers to take over any account, and Apple put its foot down by removing hidden, vulnerable webservers from Zoom clients.

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Wordfence Weekly July 03 2019 – July 09 2019

This week, a new XSS flaw in Yoast was disclosed. Updating the plugin will resolve the issue, which could allow Editors in multisite environments to attack other sites in the network. In the news, YouTube catches flak for banning instructional hacking videos, and IBM officially acquires Red Hat. In our threat intel, we share a newly tracked domain used by infected sites to deploy new malicious content.

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Wordfence Weekly June 26 2019 – July 02 2019

In this Wordfence Weekly we've got a batch of repeat offenders occupying the malware rankings, but some newcomers have entered the top attacking IP addresses. In the news, check out Cloudflare's response following an outage that affected many internet users this week.

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Wordfence Weekly June 19 2019 – June 25 2019

In this week's Wordfence Weekly, we've tweaked the scope of our most common malware rankings. Previously these were ranked by which malware was identified on the most unique sites. However, this led to disproportionate representation of sites which neglected to clean old malware. Starting this week, we're ranking only malware found in new infections, which should provide more reliably actionable data.

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Wordfence Weekly June 12 2019 – June 18 2019

In this edition of the Wordfence Weekly, the top 5 list of malware hashes remains unchanged from last week, while French and Chinese hosts remain the largest source of blocked attacks on our network.

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Wordfence Weekly June 05 2019 – June 11 2019

In this edition of Wordfence Weekly, we see continued trends in malicious IPs from OVH SAS. On the malware side, familiar backdoors populate the top five but a script generating malicious binaries makes an appearance.

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Wordfence Weekly May 29 2019 – June 04 2019

In the first Wordfence Weekly we've got a vulnerability in the Convert Plus plugin, a script built to hide phishing campaigns hits the top five malware files for the week, and OVH SAS dominates the top ten attacking IPs.

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