Bitdefender cybersecurity experts: The campaign changed malware in February when one of the lead developers was killed in the Russian invasion of Ukraine.
The email attachment, sometimes a real stolen conversation, contains a zip with an xlsb, which contacts 1 of the 3 urls and downloads the dll. Now, however, it is inactive.
The xlsb file in the zip attachment, created with EtterSilent, contacts 3 url and downloads the dll, starting malware infection. But only if the IP is not blacklisted.
The zip attachment contains an xls file: This starts a powershell script, which contacts various URLs and downloads the dll, activating the malware infection chain.