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Cybermova: Ukrainian-English dictionary.KyivDictionary: Ukrainian-English dictionary.Lingea: Ukrainian-English dictionary & other languages.Slovnyk.ua: Ukrainian dictionary, declension & conjugation NEW.Словник української мови: Dictionary of the Ukrainian language in 20 volumes (forthcoming).While analysts are still putting all the pieces together, the Avast investigation confirms that Worok is a custom operation designed to steal data, spy, and compromise high-level victims in specific regions of the world.
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NET C#, designed to receive remote commands from a compromised Dropbox account.ĭropBoxControl can execute many – and potentially dangerous – actions, including the ability to run the "cmd /c" command with given parameters, launch executable binary files, download data from Dropbox to the infected (Windows) device, delete data on the system, exfiltrate system information or files from a specific directory, and more. The second payload is a custom information-stealing and backdoor module named DropBoxControl, a routine written in. The first payload hidden with this method is a PowerShell script for which neither ESET nor Avast have been able to obtain a sample yet.
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The steganography technique used by Worok is known as least significant bit encoding, which hides small portions of the malicious code in the "lowest bits" within specific pixels in the image that can be recovered later. Those bytes are used to assemble two executable files. The CLRLoader module is then used to execute the second-stage DLL module (PNGLoader), which extracts specific bytes hidden within PNG image files.
The method used to breach networks is still unknown once deployed, the first stage abuses DLL sideloading to execute the CLRLoader malware in memory.
ESET's knowledge into the threat's attack chain was limited, but a new analysis from Avast is now providing additional details about this operation.Īvast suggests Worok uses a complex multistage design to hide its activities. The Worok operators were targeting high-profile victims like government agencies, with a specific focus on the Middle East, Southeast Asia and South Africa. The company describes Worok as a new cyber espionage group that is using undocumented tools, including a steganography routine designed to extract a malicious payload from a plain PNG image file. The novel malware was first discovered by ESET in September. Worok is using multi-stage malware designed to steal data and compromise high-profile victims, using steganography techniques to hide pieces of the final payload in a plain PNG image file. The operation's final target, however, has been confirmed by two security firms. Worok appears to be a complex cyber-espionage operation whose individual stages are still in part a mystery. In a nutshell: Security researchers have discovered a new malware threat designed to abuse steganography techniques.
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