[BreachExchange] New 'Enemybot' DDoS Botnet Targets Routers, Web Servers

[Matthew Wheeler]

https://www.securityweek.com/new-enemybot-ddos-botnet-targets-routers-web-servers

A recently identified DDoS botnet has targeted several router models and
various types of web servers by exploiting known vulnerabilities, Fortinet
warns.

Dubbed Enemybot, the botnet appears to be the work of Keksec, an
established cybercrime group that specializes in DDoS attacks and
cryptocurrency mining.

The malware was built using the source code of the Gafgyt (Bashlite) botnet
– which leaked in 2015 – with some modules borrowed from the infamous Mirai
botnet, including the scanner module and a bot killer module.

Enemybot employs several obfuscation techniques meant not only to prevent
analysis, but also to keep it hidden from other botnets, and connects to a
command and control (C&C) server on the Tor network.

The new botnet targets numerous architectures used within Internet of
Things (IoT) products and can also target x86, which increases its chances
of infection.


To spread, Enemybot attempts to compromise devices using known combinations
of usernames and passwords, by running shell commands on Android devices
with an exposed Android Debug Bridge port (5555), and by targeting roughly
20 known router vulnerabilities.

The most recent of the targeted security holes is CVE-2022-27226, a remote
code execution issue that impacts iRZ mobile routers, and which was made
public on March 19, 2022. Enemybot, Fortinet points out, is the first
botnet to target devices from this vendor.

The threat also targets the now infamous Apache Log4j remote code execution
vulnerabilities disclosed last year (CVE-2021-44228 and CVE-2021-45046), as
well as a couple of path traversal issues in Apache HTTP server
(CVE-2021-41773 and CVE-2021-42013).

Enemybot also attempts to exploit vulnerabilities in TOTOLINK routers and
Seowon routers, as well as older flaws in ThinkPHP, D-Link routers, NETGEAR
products, Zhone routers, and ZyXEL devices.


Once a vulnerability has been successfully exploited, the malware runs a
shell command to download a shell script from a URL that is dynamically
updated by the C&C. The script is responsible for downloading the actual
Enemybot binary compiled for the target device’s architecture.

After a successful infection, the malware connects to its C&C server and
awaits instructions. Based on received commands, it can perform DNS
amplification attacks and various types of DDoS assaults, sniff traffic,
and spread to other devices via brute force attacks.

“This mix of exploits targeting web servers and applications beyond the
usual IoT devices, coupled with the wide range of supported architectures,
might be a sign of Keksec testing the viability of expanding the botnet
beyond low-resource IoT devices for more than just DDoS attacks. Based on
their previous botnet operations, using them for cryptomining is a big
possibility,” Fortinet notes.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.riskbasedsecurity.com/pipermail/breachexchange/attachments/20220415/6a241699/attachment.html>