A logic bomb attack is a type of cyber-attack where a programmer inserts a malicious code into a software program with the intention of causing damage or harm at a later time. This type of attack is often difficult to detect since the code is inserted into the program, and it can run unnoticed until it is triggered. However, there are some signs that can help identify a logic bomb attack.

1. A sudden increase in system usage: A logic bomb attack can cause a sudden increase in system resources usage, which can slow down the system and cause it to crash. Monitor your system resources regularly so you can quickly identify any unusual spikes.

2. Unusual network activity: A logic bomb attack could also cause unusual network activity such as increased traffic or suspicious connections. Monitor your network traffic logs regularly to stay aware of any new connections or unusual data transfers.

3. Changes in file size or location: If a logic bomb attack is present, you may notice changes in the file size or location of important system files. Regularly check your system files for any changes or modifications.

4. Unusual user behavior: Keep an eye out for any unusual user behavior such as frequent login attempts, attempted unauthorized access to files, or attempts to disable your security measures.

5. Increased errors or system crashes: A logic bomb attack can cause your system to crash frequently or produce a high number of error messages. Monitor your system logs to identify any unusual error patterns.

6. Unexplained system activity: A logic bomb could produce unexplained system activity, such as the execution of a program at a random time or the creation or deletion of files without any user input.

7. Unexpected delays: Keep track of the time it takes for your computer to start up or shut down. A logic bomb attack can cause unexpected delays in these processes.

8. Suspicious code: If you suspect a logic bomb is present, analyze your code for any suspicious segments. Look for code that is capable of modifying or deleting files or running a program without user input.

In conclusion, a logic bomb attack can cause significant damage or harm to your system. By staying vigilant and monitoring your system for any unusual activity, you can quickly identify and respond to a potential attack. Regularly updating and backing up your system can also help prevent a logic bomb attack from causing long term damage.