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New ‘Maggie’ Backdoor Concentrating on Microsoft SQL Servers

By Ionut Arghire on October 06, 2022

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Safety researchers with risk looking agency DCSO CyTec are warning of a brand new backdoor that has been concentrating on Microsoft SQL (MSSQL) servers.

Dubbed Maggie, the risk is being deployed within the type of a signed Prolonged Saved Process (ESP) DLL file, a kind of extension utilized by MSSQL. As soon as up and operating on a goal server, it may be managed solely utilizing SQL queries.

The backdoor helps quite a few capabilities, together with the power to run instructions and work together with information, and can be utilized by the attackers to achieve a foothold into the compromised surroundings.

Moreover, Maggie can launch brute pressure assaults towards different MSSQL servers, concentrating on admin accounts so as to add a hardcoded backdoor consumer.

To execute the backdoor on the goal server, the attacker should place the ESP file in a listing that the MSSQL server can entry, and desires legitimate credentials to load the ESP on the server.

DCSO CyTec notes that Maggie is manually loaded onto the server, after which it may possibly begin receiving SQL queries as instructions.

Based mostly on the acquired enter, the backdoor can collect system info, can manipulate information and folders on the server, and might execute packages.

Moreover, it may be used to allow network-related performance, together with TermService, a Socks5 proxy server, and port forwarding, which permit the backdoor to “act as a bridge head into the server’s community surroundings”, DCSO CyTec says.

Maggie additionally helps easy TCP redirection, which permits it to redirect incoming connections to a beforehand outlined IP and port.

“The implementation permits port reuse, making the redirection clear to licensed customers, whereas another connecting IP is ready to use the server with none interference or information of Maggie,” the safety researchers say.

The backdoor additionally helps 4 instructions linked to use utilization – however which rely on a DLL that the attackers seemingly manually add when wanted – and two instructions for brute forcing different MSSQL servers – for which a bunch, consumer and password listing file must be offered, together with an optionally available thread rely.

If the backdoor manages to efficiently brute pressure an account that has admin rights, it proceeds with the creation of a backdoor consumer account on the goal server. DCSO CyTec has recognized 285 servers with the backdoor consumer on them, unfold over 42 international locations, with a concentrate on the Asia-Pacific area (primarily South Korea, India, and Vietnam).

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