'Fully undetectable' Windows backdoor gets detected
According to Bar, prior to executing the scheduled task, the malware creates two PowerShell scripts,. Their content gets obfuscated and stored in text boxes within the Word file and gets saved to the fake update directory. As such, the scripts don't get detected in VirusTotal.calls out to the C2 server to assign a victim ID number and to fetch commands to execute.
According to Bar, the attacker messed up by issuing victim identifiers in a predictable sequence. This allowed the security researchers to develop a script that presented each victim's identifier to the backend system, so they could record the interactions with the C2 server in a packet capture. Thereafter they were able to use a second tool to extract the encrypted commands from the captured packets and decipher what the malware was doing.
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