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Wireshark showing TCP retransmission error while connecting to the server But at the time the request was made during our analysis, the listener (server) was not answering client requests.įigure 5.
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Once the script is executed, it attempts to connect to the host “” on port 443.
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The PAYLOAD_UUID constant is used as an identifier for the client, which we believe is also being used by the attackers for campaign-tracking purposes. The HTTP_CONNECTION_URL constant (hxxps://:443/TtxCTzF1Q2gqND8gcvg-cwGEk5tPhorXkzS0gXv9-zFqsvVHxi-1804lm2zGUE31cs/) is set to the Metasploit end-point that the script will be connecting to. Differences between HA1QE and meterpreter.py The major changes between the downloaded file (HA1QE) and the original file are the following:įigure 4.
VISUAL BASIC FOR MAC OS CODE
The source code of the project can be downloaded from the following URL: hxxps:///rapid7/metasploit-payloads/blob/master/python/meterpreter/meterpreter.py. The downloaded python script is a slightly modified version of the Python meterpreter file, which is also part of the Metasploit framework. When the python script is executed, it downloads a file from “hxxps://:443/HA1QE”, and executes it. It is decoded below, and as you can see, it is a very clear python script. It extracts the code from a base64-encoded string, and then executes it. As you can see above, the base64-decoded python script is passed to the ExecuteForOSX function that is going to execute it at the bottom of the function (see Figure 3). This allows it to execute python scripts by default.
![visual basic for mac os visual basic for mac os](https://code.visualstudio.com/assets/docs/editor/whyvscode/macwinlinux2.png)
VISUAL BASIC FOR MAC OS MAC OS X
We have found that this malicious VBA code uses slightly modified code taken from a metasploit framework which you can find at hxxps:///rapid7/metasploit-framework/blob/master/external/source/exploits/office_word_macro/macro.vba How it Works for Apple Mac OS XĪs you probably know, Mac OS X comes with Python pre-installed by Apple. Calling different route according to OS type You can see this in the the flow chart in Figure 3.įigure 3. Next, it takes a different route depending on the OS type, Apple Mac OS X or Microsoft Windows, that it is running on. The value of the “Comments” is base64 encoded, which can be read out and decoded by the VBA code below:Īfter it’s base64-decoded, we can capture the code in plaintext, which is python script, as shown below. The first thing it does is read the data from the “Comments” property of the Word file.įigure 2. Once the malicious VBA code is executed, the AutoOpen() function is automatically called. Asks victim to enable Macro security option When the Word file is opened, it shows notifies victims to enable the Macro security option, which allows the malicious VBA code to be executed. We then analyzed the sample, and in this blog we are going to explain how it works, step by step.
VISUAL BASIC FOR MAC OS WINDOWS
The sample targeted both Apple Mac OS X and Microsoft Windows systems. On March 16, FortiGuard Labs captured a new Word file that spreads malware by executing malicious VBA (Visual Basic for Applications) code.