Windows mining pool server
In the weeks since Microsoft released details about a serious vulnerability affecting their Exchange mail server software, a range of threat actors have been targeting exploitable servers with a variety of malware, from webshells to ransomware. Neither of these are compressed files, either. The first file is written out to the filesystem as QuickCPU. The certutil application is designed to be able to decode baseencoded security certificates, so the attackers have leveraged that functionality by encoding an executable payload in base64 and wrapping it in headers that indicate it is some form of digital certificate.
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In the weeks since Microsoft released details about a serious vulnerability affecting their Exchange mail server software, a range of threat actors have been targeting exploitable servers with a variety of malware, from webshells to ransomware. Neither of these are compressed files, either. The first file is written out to the filesystem as QuickCPU. The certutil application is designed to be able to decode baseencoded security certificates, so the attackers have leveraged that functionality by encoding an executable payload in base64 and wrapping it in headers that indicate it is some form of digital certificate.
The batch script runs this command that outputs the decoded executable into the same directory. When decoded, the batch script runs the executable, which extracts the miner and configuration data from the QuickCPU.
The file uses forged data in its Properties sheet that indicates the file is a Windows component, but the binary is not digitally signed and besides, no such file has ever existed as a standard component of Windows, though there is a legitimate utility with the same name , made by a third-party software developer.
That utility is not connected to this malware in any way. The executable appears to contain a modified version of a tool publicly available on Github called PExInjector. The batch file then deletes the evidence and the miner remains running in memory, injected into a process already running on the system.
Among the files contained in the QuickCPU. By default, the payload sets up the miner so that it only can communicate if it can have a secure TLS connection back to the Monero wallet where it will store its value. According to the Monero blockchain, the wallet began receiving funds on March 9 the Patch Tuesday in which the Exchange updates were released as part of the update cycle , which corresponds with when we saw the attack begin.
As time has gone on, the attacker lost several servers and the cryptomining output decreased, but then gained a few new ones that more than make up for the early losses. SophosLabs has published indicators of compromise to our Github page. SophosLabs acknowledges the assistance of Fraser Howard and Simon Porter in the discovery and analysis of this threat. SophosLabs Principal Researcher Andrew Brandt blends a year journalism background with deep, retrospective analysis of malware infections, ransomware, and cyberattacks as the editor of SophosLabs Uncut.
His work with the Labs team helps Sophos protect its global customers, and alerts the world about notable criminal behavior and activity, whether it's normal or novel. Follow him at threatresearch on Twitter for up-to-the-minute news about all things malicious. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. Skip to content. How the attack works The. A segment of a root-cause analysis flowchart shows the QuickCPU installer running within the system folder on a compromised Exchange server after certutil.
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