Common Backdoors Hackers Use to Hack Network Systems

Hackers use different methods to access a network and a backdoor is just one of them. A backdoor allows hackers to access the network and gives them the means to return and enter the system. There are a lot of complex problems that backdoors present for system administrators as they need to understand the methods used by hackers before they can identify the challenge of blocking their access. Additionally, some of the backdoors used by hackers are designed to hack network systems without being detected by administrators, making the issue more complex. These include the following:

Using Backdoor Utilities

Some backdoor utilities let hackers access a network and keep returning through the same exploit. While the administrator changes the password during an attack detection, backdoors can be programmed to offer the hacker repeat access to the networks. The use rarely used machines on the network to accomplish this. 

Moreover, hackers can also use another backdoor utility that allows them to return to the network within a short amount of time, preventing them from going through the effort of finding a hotel they can exploit. If the hacker things they have been detected, they will locate a vulnerability to avoid detection.

Cracking Passwords

Password crackers locate the accounts with weak passwords. These accounts are either used infrequently or unused and the hacker changes the password to make an access point. If the system administrator searches for the fragile accounts, the accounts with the passwords changed will no longer be found. Hackers crack passwords through the following:

  • Libraries. Network systems can use libraries shared to recycle frequently used routines to minimize program sizes. Hackers will use a backdoor for accessing the routines with a backdoor password. If the login program is checked by the administrator, the library won’t be visible as a source for backdoor passwords.
  • Timestamps. Timestamps are used for replacing binary files with a trojan without being detected. This can be accomplished by recreating the timestamp on the binary file and placing it on the trojan file. Hackers will set back the clock on the binary file and adjust the clock on the trojan file to the system clock to reflect the same time as the original file. 
  • Bootblock. A network’s bootblock section is where viruses can go undetected. The reason is that administrators don’t have software that periodically checks the bootblock. To exploit this, hackers hide backdoors inside the bootblock. 

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