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 * Russia-linked APT28 hacked Roundcube email servers of Ukrainian entities
 * New Condi DDoS botnet targets TP-Link Wi-Fi routers
 * Critical RCE flaw CVE-2023-20887 in VMware vRealize exploited in the wild



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NEW CONDI DDOS BOTNET TARGETS TP-LINK WI-FI ROUTERS

June 21, 2023  By Pierluigi Paganini




RESEARCHERS DISCOVERED A NEW STRAIN OF MALWARE CALLED CONDI THAT TARGETS TP-LINK
ARCHER AX21 (AX1800) WI-FI ROUTERS.

Fortinet FortiGuard Labs Researchers discovered a new strain of malware
called Condi that was observed exploiting a vulnerability in TP-Link Archer AX21
(AX1800) Wi-Fi routers.

“FortiGuard Labs encountered recent samples of a DDoS-as-a-service botnet
calling itself Condi. It attempted to spread by exploiting TP-Link Archer AX21
(AX1800) routers vulnerable to CVE-2023-1389, which was disclosed in mid-March
of this year.” reads the report published by Fortinet. “We have additionally
observed an increasing number of Condi samples collected from our monitoring
systems since the end of May 2023, indicating an active attempt to expand the
botnet.”


00:00/00:00


The CVE-2023-1389 flaw exploited by the bot is a command injection
vulnerability. An unauthenticated attacker can trigger the issue to inject
commands, which would run as root, sending a simple POST request.

The malware compromises the devices to build a distributed denial-of-service
(DDoS) botnet.

The researchers observed a surge in attacks in May 2023.

The threat actor behind the botnet, zxcr9999, advertises its malware on a
Telegram channel named Condì Network. The channel was created in May 2022 and
the threat actor is using it to offer a DDoS-for-hire service through the botnet
and is also offering the source code of the bot for sale.

The bot supports anti-analysis functionalities and is also able to kill
processes associate with competing botnets.

The bot propagates using an embedded simple scanner borrowed from Mirai’s
original Telnet scanner to scan for any public IPs with open ports 80 or 8080
(commonly used for HTTP servers) and then sends a hardcoded exploitation
request. The request allows the bot to download and execute a remote shell
script at hxxp://cdn2[.]duc3k[.]com/t which deploys the Condi sample on
vulnerable TP-Link Archer AX21 devices.

The sample analyzed by Fortinet only contained the scanner for CVE-2023-1389,
however, experts explained that other Condi samples were also spotted exploiting
other vulnerabilities to propagate.

The bot doesn’t survive the system restart, for this reason, the author
implemented a keep-alive feature to prevent reboot. The mechanism is implemented
by deleting multiple binaries that are used to shut down or reboot the system:

 * /usr/sbin/reboot
 * /usr/bin/reboot
 * /usr/sbin/shutdown
 * /usr/bin/shutdown
 * /usr/sbin/poweroff
 * /usr/bin/poweroff
 * /usr/sbin/halt
 * /usr/bin/halt

The C2 communication relies on a binary protocol that is a modified version of
that initially implemented in the Mirai botnet.

“Malware campaigns, especially botnets, are always looking for ways to expand.
Exploiting recently discovered (or published) vulnerabilities has always been
one of their favored methods, as we highlighted above for the Condi botnet.”
concludes the report.”Thus, it is strongly recommended to always apply the
latest security patches and updates as soon as possible.”

Follow me on Twitter: @securityaffairs and Facebook and Mastodon

Pierluigi Paganini

(SecurityAffairs – hacking, VMware)


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PIERLUIGI PAGANINI

Pierluigi Paganini is member of the ENISA (European Union Agency for Network and
Information Security) Threat Landscape Stakeholder Group and Cyber G7 Group, he
is also a Security Evangelist, Security Analyst and Freelance Writer.
Editor-in-Chief at "Cyber Defense Magazine", Pierluigi is a cyber security
expert with over 20 years experience in the field, he is Certified Ethical
Hacker at EC Council in London. The passion for writing and a strong belief that
security is founded on sharing and awareness led Pierluigi to find the security
blog "Security Affairs" recently named a Top National Security Resource for US.
Pierluigi is a member of the "The Hacker News" team and he is a writer for some
major publications in the field such as Cyber War Zone, ICTTF, Infosec Island,
Infosec Institute, The Hacker News Magazine and for many other Security
magazines. Author of the Books "The Deep Dark Web" and “Digital Virtual Currency
and Bitcoin”.




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