How to build your own botnet in less than 15 minutes,
Today on How to build your own botnet in less than 15 minutes-
Firstly Step 1: Find a builder kit (3 minutes)
Using a combination of search terms, you can usually find a link to a version of a popular builder kit in 3 minutes or less. Our chosen kit was originally an underground – yet commercial – product based on the ZeuS code, and originally cost $600 for a hardcoded command-and-control (CnC) server and $1,800 for an unlimited builder license. But considering that youâ€™re building a botnet to steal massive amounts of sensitive data, weâ€™ll assume that you have no qualms about using a pirated copy.
Our bot has the following core components:
A settings.txt file for configuring the CnC callback channel
The Full_builder.exe file for compiling the bot payload
CnC host files. This is a PHP-based website used for reporting and CnC functions
bot-bc.exe. This process allows your malware to back-connect through the Socket Secure (SOCKS) protocol for remotely controlling compromised machines
Figure 1: The builder kit’s settings.txt file
Figure 1 shows the settings.txt file, highlighting a number of options. The â€œURL Masksâ€ section lets you specify certain actions if the user of the compromised machine visits a website whose URL matches a given text string. These URLs can be anything you want. In Figure 1, the URL masks include ebay.com and owa (Outlook Web access, for gaining control of the targetâ€™s corporate email account).
The â€œURL Masksâ€ options enable any of the following when the user visits any of the sites defined in the URL Masks section:
N â€” do not write data in reports
S â€” make screenshot with mouse clicks on the page area
C â€”preserve all cookies associated with that site and block access to it
B â€” block access to the site
The injects.txt file highlighted in Figure 1 is arguably the killer feature of the Zeus family of bots. Essentially, the â€œinjectsâ€ capability lets you interact with any site that the compromised machine accesses. Because it works on the infected userâ€™s machine directly, the feature renders meaningless security features on those sites, such as two-factor authentication and SSL/TLS encryption. Forget man-in-the-middle attacks â€” this is a â€œman-at-the-keyboardâ€ attack!
Figure 2: Example use-cases of the “Injects” functionality
In Example 1, the contents of the accountOverview section are uploaded to the CnC server whenever the compromised host goes to a URL containing â€œhttps://www.payment-site.com/*/webscr?cmd=_login-done*.â€ With this handy report of usersâ€™ account balances, you can focus on targeting those with the most money in their accounts.
Further more in Example 2, a “Big Bank Corp” site viewed by a compromised system would show an additional field on the password page asking for userâ€™s â€œATM PIN.â€ Because your grafted-in field is designed in the same style as the standard page, it looks like it belongs there. Sensing nothing amiss, many computer users would not hesitate to enter this information â€” which is immediately sent to you, the attacker.
Those are only two examples. As a botnet owner, you could create all sorts of targeted injects files to steal new and useful information. If thatâ€™s too much work, you can download ready-to-use injects definitions that serve as recipe books of sorts for specific attacks. Need to target end-users in France? Simply download the French Banks injects pack containing recipes for the purely illustrative and imaginary â€œLa Banque Centraleâ€ or â€œCrÃ©dit FranÃ§aisâ€, among others.
Step 2: Build your payload (5 minutes)
Once your injects file is ready, open the easy-to-use GUI interface to build the executable malware file (see Figure 3).
Lastly you’ll need two pieces of information to build the malware:
Firstly The URL to your setting.txt file (youâ€™ll store the file on your CnC server so you can change it at will)
Then A symmetric-key encryption key to embed in the payload, so that it can communicate securely with your CnC server. This key can be any string of characters
Figure 3: The builder GUI for compiling the malware payload
After you have compiled the malware, youâ€™ll run your executable through a file compressor or obfuscator, also known as a packer or a crypter. Originally designed to reduce the file size of an executable file, these packers have the added benefit of disguising files when scanned by anti-virus software. For this example, I have used popular compressors which is this example I have called packers “A” to “C”.
Further more to see whether the compressed files are sufficiently camouflaged, youâ€™ll submit your files to VirusTotal, a free site that scans uploaded files using a number of anti-virus engines. “(Note: if you were a real cybercriminal, youâ€™d probably choose a different virus-scanning site such as Scan4You, Chk4Me, or ElementScanner. VirusTotal shares its scanning results with anyone â€” including IT security companies â€” which could.
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