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December 9, 2017 02:00 am

'Process Doppelganging' Attack Bypasses Most Security Products, Works On All Windows Versions

An anonymous reader quotes a report from Bleeping Computer: Yesterday, at the Black Hat Europe 2017 security conference in London, two security researchers from cyber-security firm enSilo have described a new code injection technique called "Process Doppelganging." This new attack works on all Windows versions and researchers say it bypasses most of today's major security products. Process Doppelganging is somewhat similar to another technique called "Process Hollowing," but with a twist, as it utilizes the Windows mechanism of NTFS Transactions. "The goal of the technique is to allow a malware to run arbitrary code (including code that is known to be malicious) in the context of a legitimate process on the target machine," Tal Liberman & Eugene Kogan, the two enSilo researchers who discovered the attack told Bleeping Computer. "Very similar to process hollowing but with a novel twist. The challenge is doing it without using suspicious process and memory operations such as SuspendProcess, NtUnmapViewOfSection. In order to achieve this goal we leverage NTFS transactions. We overwrite a legitimate file in the context of a transaction. We then create a section from the modified file (in the context of the transaction) and create a process out of it. It appears that scanning the file while it's in transaction is not possible by the vendors we checked so far (some even hang) and since we rollback the transaction, our activity leaves no trace behind." The good news is that "there are a lot of technical challenges" in making Process Doppelganging work, and attackers need to know "a lot of undocumented details on process creation." The bad news is that the attack "cannot be patched since it exploits fundamental features and the core design of the process loading mechanism in Windows." More research on the attack will be published on the Black Hat website in the following days.

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