These blobs contain the different parts of the configuration. Once the backdoor sends basic information about its newly compromised system, the operators take control of the backdoor and start to send commands right away. In this section we describe in more detail the commands performed manually by the operators through their Delphi backdoor. The number of supported commands has increased over time, with the latest version of the backdoor having more than thirty. As we did not identify a pattern in the order which the commands are invoked, we believe the operators are executing them manually.
The commands above are commonly executed when the operators first connect to a newly activated backdoor. Other commands commonly seen executed shortly after these backdoors are activated, listed below:. Those who already have read our previous articles about Zebrocy will notice that more or less the same kind of information is sent, over and over again by previous stages. This information is requested within a few minutes of initial compromise and the amount of data the operator will have to deal with is quite considerable. The current dumpers have some similarities with those previously used by the group.
These dumpers create log files indicating the presence or absence of potential databases to dump:. These dumpers are quickly removed once they have done their job. Moreover, the backdoor contains a list of filenames related to credentials from software listed below database names :. This command can be used when the operators are aware of the presence of interesting files on the computer.
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Finally, depending on how interesting the victim is, they malware operators may deploy another custom backdoor. There are some interesting facts here. First, they use COM object hijacking to make the malware persistent on the system even though the custom backdoor is installed only for a few hours. The two Delphi backdoors, the common one and the one above, are quite similar but contain these interesting tweaks:. The very short timeframe where this backdoor is on the system and operating makes it harder to retrieve.
Once its operators complete their evil deeds, they quickly remove it. Observing commands used in the wild by the operator is quite interesting.
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They are gathering a considerable amount of information on the compromised target and they are not worried about duplicated data. It shows a large gap between the development strategy and what operators do in practice. Backdoors with custom configuration and modules are deployed very carefully, which indicates some precautions to avoid ending up in the hands of researchers. The first set of commands is the same and executed during a very short timeframe, which raises another question: is it automated?
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