141. Inside 3AM Ransomware Toolkit: GoodSync

Hello everyone!

Let's keep digging into ransomware affiliates' toolkit. And this time we'll focus on data exfiltration stage.

According to Sophos report, 3AM ransomware affiliates leveraged a legitimate tool called GoodSync:

"On two hosts, the threat actor installed a legitimate cloud synchronization tool called GoodSync, which is compatible with Microsoft, Google, Amazon, Dropbox, and other services. They then used GoodSync to upload approximately 868 GB of data from those servers to the cloud storage provider Backblaze."

Transferring data to cloud storage is quite common tactic, but adversaries always experiment with their toolset.

As always, we can hunt for execution events related to the tool:

event_type: "processcreatewin"

AND

proc_file_productname: "goodsync"

Report contains lots of interesting behavior markers, make sure to check it!

See you tomorrow!

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