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Tim.bat has one more trick up its sleeve: It downloads another script, called “nsudo.bat,” which performs multiple operations with the goal of elevating privileges on the system and impairing defenses:

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The intensive use of legitimate Windows utilities and functions serves to help the malware avoid defenses and hide itself, researchers noted. This final payload is executed using the legitimate Windows function known as regsvr32, which allows the attackers to proxy the execution of the DLL through a signed binary by Microsoft. “The tim.bat file is a very short script that downloads the final ZLoader DLL payload with the name tim.dll,” they noted.

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They added that the tim.exe binary is actually a backdoored version of the legitimate Windows utility wextract.exe, containing additional code for creating a new malicious batch file with the name “tim.bat.” “This allows the attacker to break the parent/child correlation often used by endpoint detection and response (EDRs) for detection,” researchers explained. It then adds exclusions, such as regsvr32, *.exe, *.dll, with the cmdlet Add-MpPreference to hide all the components of the malware from Windows Defender.”Īt this point, it downloads a fourth stage dropper from the URL “hxxps:///timexe,” which is saved as “tim.exe” and executed through the legitimate Windows explorer.exe function. “At first, it disables all the Windows Defender modules through the PowerShell cmdlet Set-MpPreference. “The third stage dropper contains most of the logic to impair the defenses of the machine,” researchers explained. This third-stage script performs most of the Defender-killing dirty work. BAT file appropriately called “setup.bat.”Īfter that, the built-in Windows cmd.exe function is used to execute that file, which in turn downloads a second-stage dropper that then initiates yet a third stage of infection by executing a script called “updatescript.bat.” Once downloaded, it runs an installation wizard that creates the following directory: C:\Program Files (x86)\Sun Technology Network\Oracle Java SE, and drops a.

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MSI file is of course not an installer for legitimate software at all, but is rather the first-stage dropper for the malware. “The company was registered on 29 June 2021, suggesting that the threat actor possibly registered the company for the purpose of obtaining those certificates.” Disabling Windows Defender “It appears that the cybercriminals managed to obtain a valid certificate issued by Flyintellect Inc., a Software company in Brampton, Canada,” researchers explained. From there, the user can be tricked into downloading a fake installer in a signed MSI format, with a signing timestamp of Aug. Thus, when someone Googles, say, “Team Viewer download,” an advertisement shown by Google will redirect the person to a fake TeamViewer site under the attacker’s control, according to SentinelLabs. The lures include Discord, Java plugins, Microsoft’s TeamViewer and Zoom. To target victims, the malware is spread from a fake Google advertisement (published through Google AdWords) for various software, researchers found – an indirect alternative to social-engineering tactics like spear-phishing emails. It also provides backdoor capabilities and acts as a generic loader to deliver other forms of malware.” Stealthy ZLoader Infection Chain Starts With Google AdWords “It attacks users of financial institutions all over the world and has also been used to deliver ransomware families like Egregor and Ryuk. “ is a typical banking trojan which implements web injection to steal cookies, passwords and any sensitive information,” SentinelLabs analysts noted in a Monday posting on the new campaign. ZLoader has been around a while, one of many malware forks rising from the ashes of the Zeus banking trojan after its source code was published nearly 10 years ago.

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That’s according to SentinelLabs, which said that to lower the rates of detection, the infection chain for the campaign also includes the use of a signed dropper, plus a backdoored version of the Windows utility wextract.exe to embed the ZLoader payload itself. A targeted campaign delivering the ZLoader banking trojan is spreading via Google AdWords, and is using a mechanism to disable all Windows Defender modules on victim machines, researchers have found.