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#GoldMax (aka #SUNSHUTTLE) is a new and capable backdoor written in Go/Golang. It is typically used as a late-stage (e.g. 3+) backdoor brought into an environment using access enabled via #TEARDROP, #RainDrop and other related malware deployed by #NOBELIUM/UNC2452.
#GoldMax creates & maintains a config file (name unique to each implant). The config file is AES-256 encrypted (unique-to-each-implant key) & then Base64 encoded (custom alphabet, '=' replaced with null). A handy C2 command allows the operators to update certain config fields.
Read 17 tweets
As part of our commitment to keeping our customers/community protected & informed, we are releasing a blog that shines light on transition between Stage 1 and 2 of #Solorigate/#SUNBURST campaign, custom Cobalt Strike loaders, post-exploit. artifacts, IOCs:…
Here are some highlights:
The missing link between the Solorigate backdoor and the custom #CobaltStrike loaders observed during the #Solorigate is an Image File Execution Options (IFEO) Debugger registry value created for the legitimate process dllhost.exe (ATT&CK ID: T1546.012).
Once the registry value is created, the attackers wait for the occasional execution of dllhost.exe, which might happen naturally on a system. This execution triggers a process launch of wscript.exe configured to run the VBScript file dropped by the SolarWinds backdoor (Stage 1).
Read 21 tweets

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