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License = "This Yara rule is provided under the Apache License 2.0 () and open to any user or organization, as long as you use it under this license and ensure originator credit in any derivative to The BlackBerry Research & Intelligence Team" The following YARA rule was authored by the BlackBerry Research & Intelligence Team to catch the threat described in this document:ĭescription = "Detects 2022 CryptBot Through Imphash"Īuthor = "BlackBerry Threat Research Team"
#The archive browser mac cracked download#
The best mitigation tactic against CryptBot is for users to be extra vigilant when visiting websites to download new software, and only trusting download links from legitimate vendors rather than third-party or pirate websites. This could benefit the attackers by allowing more frequent and quicker infection processes. As a result of this paring down, the size of the malicious archive files being downloaded from the compromised pages are roughly half the size. So why did the malware’s author decide to cut some features from the latest version of CryptBot? This decision could have been made in attempt to simplify the attack overall, and to ensure that focus is solely placed on the vital functionalities. These other operating systems make a less lucrative target for threat actors who use this particular distribution method.
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This is likely because the malware’s infection vector uses pirated websites offering cracked software, which is not as common on other operating systems such as Mac OS X and Linux®.
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ConclusionĬryptBot has thus far only been observed targeting Windows devices. The latest version of CryptBot has also been modified to target all versions of Google Chrome™, including the newest version, Chrome™ v96.
Previous versions of this infostealer contained two C2 addresses that were used for data exfiltration and one address used to retrieve additional malware, whereas the version analyzed here has been limited to one dedicated address for exfiltration and one for additional downloads. The malicious BAT script now in use contains a higher level of obfuscation, using encrypted variables to help impede analysis by threat researchers.
The obfuscation methods used in this version also differ from older variants of CryptBot. The current version deletes only gathered data after successfully performing data exfiltration, rather than its own files. The latest version of CryptBot also does not steal screenshots of the victim’s desktop, nor does it perform self-deletion of the malicious files used. One of the features removed is the anti-sandbox capabilities used in previous versions. Overall, it appears that the threat actor has decided to trim the file, so it only includes the core functionality necessary for successful data exfiltration. The very latest version of CryptBot was first spotted in the wild in early 2022, with a few notable differences from previous variations. The script performs a scan against a task list referencing two antivirus (AV) products, “BullGuardCore” and “Panda Cloud Antivirus.” If the AV products are present, the malware will perform a “sleep” function to delay execution and aid in bypassing detection.įigure 8 - C2 addresses and a selection of targeted directories Latest Variant The structure and contents of the BAT script, such as obfuscated variables, can be seen in Figure 4 below. This tool is intended for use in automating services via scripts however, it has frequently been abused by many different malware families. WMV extensions.Ī copy of “AutoITv3.exe” is also dropped to the folder as “Raccontero.exe.” This tool is an interpreter that is part of AutoIT, which is a freeware programming language for Windows-based devices. Different variants analyzed have also been observed using. The file extensions used vary, depending on the version of CryptBot downloaded by the victim. GIF extension to masquerade as image files. However, these files are in fact malicious scripts using the. “Raccontero.exe” – An AutoIT v3 executable compilerĪs seen in Figure 3, two of these files are displayed as.“Carne.gif” – An obfuscated AutoIT script.“aeFdOLFszTz.dll” – A legitimate copy of Microsoft® Windows® “ntdll.dll”.This folder contains four files that are used to carry out the next stage of the attack: Figure 3 - Folder placed into user’s Temp directory post execution
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