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New MrbMiner malware has contaminated 1000’s of MSSQL databases

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MSSQL Microsoft SQL Server
Picture: Caroline Grondin, Microsoft, ZDNet

A brand new malware gang has made a reputation for itself over the previous few months by hacking into Microsoft SQL Servers (MSSQL) and putting in a crypto-miner.

Hundreds of MSSQL databases have been contaminated to this point, in accordance with the cybersecurity arm of Chinese language tech big Tencent.

In a report printed earlier this month, Tencent Safety has named this new malware gang MrbMiner, after one of many domains utilized by the group to host their malware.

The Chinese language firm says the botnet has solely unfold by scanning the web for MSSQL servers after which performing brute-force assaults by repeatedly attempting the admin account with numerous weak passwords.

As soon as the attackers gained a foothold on a system, they downloaded an preliminary assm.exe file, which they used to determine a (re)boot persistence mechanism and so as to add a backdoor account for future entry. Tencent says this account makes use of the username “Default” and a password of “@fg125kjnhn987.”

The final step of the an infection course of was to hook up with the command and management server and obtain an app that mines the Monero (XMR) cryptocurrency by abusing native server assets and producing XMR cash into accounts managed by the attackers.

Linux and ARM variants additionally found

Tencent Safety says that whereas they noticed solely infections on MSSQL servers, the MrbMiner C&C server additionally contained variations of the group’s malware written to focus on Linux servers and ARM-based programs.

After analyzing the Linux model of the MrbMiner malware, Tencent consultants stated they recognized a Monero pockets the place the malware generated funds.

The tackle contained 3.38 XMR (~$300), suggesting that the Linux variations had been additionally being actively distributed, though particulars about these assaults stay unknown for now.

The Monero pockets used for the MbrMiner model deployed on MSSQL servers saved 7 XMR (~$630). Whereas the 2 sums are small, crypto-mining gangs are recognized to make use of a number of wallets for his or her operations, and the group has more than likely generated a lot bigger income.

For now, what system directors must do is to scan their MSSQL servers for the presence of the Default/@fg125kjnhn987 backdoor account. In case they discover programs with this account configured, full community audits are advisable.

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