Crackonosh: A New Malware Distributed in Cracked Software


We looked into this report and others like it and have found a new malware we’re calling “Crackonosh” in part because of some possible indications that the malware author may be Czech. Crackonosh is distributed along with illegal, cracked copies of popular software and searches for and disables many popular antivirus programs as part of its anti-detection and anti-forensics tactics.

In this posting we analyze Crackonosh. We look first at how Crackonosh is installed. In our analysis we found that it drops three key files winrmsrv.exe,winscomrssrv.dll andwinlogui.exe which we analyze below. We also include information on the steps it takes to disable Windows Defender and Windows Update as well as anti-detection and anti-forensics actions. We include information on how to remove Crackonosh. Finally, we include indicators of compromise for Crackonosh.

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