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<div style="margin:0px;font-size:14.67px;background-color:white">I hope everyone is doing well!</div>
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<div style="margin:0px;font-size:14.67px;background-color:white">Below is the entry for today.</div>
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<div style="margin:0px;font-size:14.67px;background-color:white">09/30/2021 - Diary entry #359<br>
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This week a new Backdoor malware was disclosed. Named Tomiris Backdoor, it's believed to be developed by the APT Group Nobelium (a.k.a. DarkHalo). Nobelium became famous in late 2020, as being responsible for the SolarWinds' supply-chain attack.
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<div>This threat presents lots of similarities with GoldMax (a.k.a. Sunshuttle) covered in our Daily Diary #217, developed by Nobelium and found in some of the infected targets in the SolarWinds' incident. Tomiris and GoldMax share a very similar code, adopting
the same encryption and obfuscation techniques to encode their strings, configuration and communication. Both also use scheduled tasks to get persistence on the infected machine. Although similar, Tomiris seems to be a much simpler threat, having little functionality
besides downloading additional malware, indicating that it's probably a part of a major attack chain.</div>
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Despite the similarities altogether linking Nobelium with Sunshuttle, it can also be an attempt to mislead security researchers into a false attribution. Regardless, Tomiris samples were discovered in an environment in which other computers were infected with
Kazuar, another malware sample from Nobelium. So this discovery reveals that the Nobelium group is still active, and increasing its toolkit.
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<span style="margin:0px;font-size:14.67px;background-color:white">Kind Regards,</span></div>
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<strong>Felipe Duarte Domingues</strong><br>
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<strong>Appgate</strong></p>
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