Hackers exploit not too long ago patched Confluence bug for cryptomining

Assorted cryptocurrency

A cryptomining hacking group has been noticed exploiting the not too long ago disclosed distant code execution flaw in Atlassian Confluence servers to put in miners on weak servers.

The vulnerability, tracked as CVE-2022-26134, was found as an actively exploited zero-day on the finish of Could, whereas the seller launched a repair on June 3, 2022.

Numerous proof of idea (PoC) exploits have been launched within the days that adopted, giving a broader base of malicious actors a straightforward strategy to exploit the flaw for his or her functions.

One of many menace actors who took benefit of this providing is a cryptomining group known as the “8220 gang,” who, in response to Test Level, carry out mass web scans to seek out weak Home windows and Linux endpoints to plant miners.

Miners are special-purpose packages that use the host’s accessible computational sources to mine cryptocurrencies like Monero for the menace actor.

The direct consequence of this exercise is decreased server efficiency, elevated {hardware} put on, elevated operating prices, and even enterprise disruption.

Moreover, by getting access to the system, these actors can improve their assault anytime and drop stronger payloads.

8220 gang Assault chain

The assault begins on each Linux and Home windows methods by sending a specifically crafted HTTP request that exploits CVE-2022-26134 and drops a base64-encoded payload.

Malicious HTTP request
Malicious HTTP request (Test Level)

Subsequent, the payload fetches an executable, a malware dropper script on Linux, and a toddler course of spawner on Home windows.

Each circumstances goal to determine reboot persistence (through cron jobs or startup folder), uninstall all operating brokers, after which activate the miner.

The 8220 gang attack chain
The 8220 gang assault chain (Test Level)

In each circumstances, the miner will exhaust all system sources, so the “8220 gang” goes for optimum revenue till their malware is uprooted as a substitute of silently mining on compromised servers and striving to remain undetected by utilizing solely a part of the accessible computational energy.

Lastly, the Linux script additionally searches for SSH keys within the host to try to unfold to adjoining machines on the breached community.

Confluence RCE exploitation

Whereas the “8220 gang” exploits CVE-2022-26134 for cryptomining, different menace actors are putting in internet shells, creating new admin accounts, executing instructions, and even taking full management of the server.

Based on Greynoise information, the exploitation makes an attempt peaked on June 6, 2022, however the detection of malicious makes an attempt continues at excessive ranges in the present day.

Exploitation attempts detected by Greynoise
Exploitation makes an attempt detected by Greynoise

Linux botnets, equivalent to Kinsing, Hezb, and Darkish.IoT, are additionally exploiting the vulnerability to deploy backdoors and cryptominers.

Atlassian has warned its clients that the one mitigation for the crucial flaw is to use the safety updates, which have turn out to be accessible in variations 7.4.17, 7.13.7, 7.14.3, 7.15.2, 7.16.4, 7.17.4, and seven.18.1.

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