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Customers Warned of New Aerst, ScareCrow, and Vohuk Ransomware Households

By Ionut Arghire on December 12, 2022

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Fortinet’s safety researchers have shared data on three new ransomware households named Aerst, ScareCrow, and Vohuk.

Concentrating on Home windows computer systems, these are typical ransomware households that encrypt sufferer recordsdata and demand a ransom cost in trade for a decryption key. This new ransomware has been utilized in an rising variety of assaults.

Aerst was seen appending to encrypted recordsdata the ‘.aerst’ extension and displaying a popup window containing the attacker’s e mail handle, as an alternative of dropping a typical ransom observe.

The popup window comprises a discipline the place the sufferer can enter a purchase order key required to revive the encrypted information. Aerst deletes Quantity Shadow copies to stop file restoration.

Vohuk does drop a ransom observe – readme.txt – asking the sufferer to contact the attackers by way of e mail. Seemingly beneath steady growth, the malware assigns a novel ID to every sufferer.

This ransomware household appends the ‘.vohuk’ extension to the encrypted recordsdata, replaces file icons with a pink lock icon, and adjustments the desktop wallpaper with its personal.

“The ransomware leaves a particular mutex, ‘GlobalVohukMutex’, which prevents totally different cases of Vohuk ransomware from operating on the identical system,” Fortinet explains.

The malware has been primarily focusing on customers in Germany and India.

ScareCrow’s ransom observe, named ‘readme.txt’, instructs victims to contact the attacker utilizing one in every of three Telegram channels. The risk seems to be probably the most widespread, with recordsdata submitted from the USA, Germany, India, Italy, the Philippines, and Russia.

Fortinet has recognized some similarities between ScareCrow and Conti, akin to the usage of the CHACHA algorithm for encryption, and the usage of the WMI command-line utility to delete Quantity Shadow copies, which counsel that ScareCrow’s builders might need used Conti supply code leaked earlier this yr.

The ransomware’s developer has encrypted every command string within the malware, together with DLL names, API names, and even command strings, with a special decryption routine. ScareCrow appends the ‘.crow’ extension to the encrypted recordsdata.

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