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More Details on the Recent Malspam Campaign
META is currently being utilized in cyberattacks in a recent malspam campaign, according to security researcher and ISC Handler Brad Duncan. It is being used for passwords stored in Chrome, Edge, and Firefox theft purposes, as well as to steal cryptocurrency wallets, the BleepingComputer publication reports.
The infection chain in this campaign uses the “conventional” approach of sending a macro-laced Excel spreadsheet as an email attachment to potential victims’ inboxes.
Since Wednesday 2022-03-30, at least 16 samples of a specific Excel file have been submitted to VirusTotal. These malicious Excel files are distributed as email attachments. Post-infection traffic triggers signatures for Win32/MetaStealer Related Activity from the EmergingThreats Pro (ETPRO) ruleset. This infection process uses data binaries to create the malicious EXE and DLL files used for the infection. The malware abuses legitimate services by Github and transfer.sh to host these data binaries. All URLs, domains, and IP addresses were still active for the infection approximately 3 hours before I posted this diary.
What happens if the malicious script is launched, is that it will download several payloads from various domains, including GitHub, DLLs, and executables.
To avoid detection by the security software, some of the downloaded files are base64 encoded or have their bytes inverted.
The full payload is eventually constructed on the machine under the name “qwveqwveqw.exe,” which is most likely random, and a new registry entry for persistence is created.
The EXE file generating communication to a command and control server at 193.106.191[.]162, even after the system reboots, represents obvious and persistent infection evidence, restarting the infection process on the compromised machine.
In his report, Brad Ducan also depicted the traffic generated by an infection filtered in Wireshark.
It’s also worth mentioning that META uses PowerShell to tell Windows Defender to ignore.exe files in order to protect its files from detection.
Duncan has made the PCAP of the infected traffic available here if you’d want to find more details on the particularities of the captured malicious traffic.
Brad Duncan also mentioned that
Each time I rebooted my infected Windows host, the persistent EXE generated traffic to the same transfer.sh URL and re-started the infection process without the Github traffic. Malware associated with this infection was first submitted to VT on Wednesday 2022-03-30. ETPRO signatures identifying HTTP traffic generated by this malware as MetaStealer were released on Friday 2022-04-01.
Hi! My name is Andra and I am a passionate writer interested in a variety of topics. I am curious about the cybersecurity world and what I want to achieve through what I write is to keep you curious too!