What are the signs of system intrusion? Abnormal signals and identification methods

in the current deep integration of digital office and life, all kinds of systems carry massive data and core business, once encountered security threats, not only will cause data leakage, but also may lead to business paralysis, property damage and other serious consequences. System intrusion is not without warning, in most cases, abnormal signals will be released through equipment, network, account and other levels. This article will deeply disassemble the various signs of system intrusion, share practical identification methods, help users quickly detect risks, build a strong system security line.

What are the abnormal signs of the system being invaded?

equipment is the carrier of the system operation, after the system is invaded, often take the lead in the equipment operation state shows an abnormality, such signs intuitive and easy to detect, is the first clue to identify the invasion.

1, equipment operation card or crash

system is invaded, attackers may implant mining programs, virus Trojans and other malicious software in the background, such programs will continue to occupy a lot of CPU, memory and other hardware resources, resulting in equipment without reason card, slow response, and even frequent crash restart. Even if all normal running programs are closed, the running state of the device cannot return to normal, which is a signal that the system has been invaded.

2, unfamiliar processes or programs start automatically

view through the task manager or system monitoring tools, if you find a process with an unfamiliar name, abnormal path, or an uninstalled program automatically starts after booting, and cannot be uninstalled or closed normally, it is likely that after the system is invaded, the attacker implants malicious processes running in the background, such processes are often used to steal data, control devices or launch follow-up attacks.

Second, what are the abnormal signs of network intrusion?

system is invaded, attackers usually transmit stolen data or receive control instructions through the network, so network-level anomalies are also an important basis for identifying intrusions.

1, abnormal fluctuations in network traffic

use network monitoring tools to view, if the device is found in the case of no download, upload operation, there is a continuous large traffic data transmission, or the Internet bandwidth is inexplicably full, resulting in normal Internet access, business operation card, which may be After the system is invaded, attackers steal data in the background and transmit to the outside, or use the device to initiate DDoS attacks caused by abnormal traffic.

2, unfamiliar network connections or open ports

view the tool through the network connection, if you find that the device has established a long-term connection with the unknown Internet Protocol Address, or the system has opened unused high-risk ports, such as 3389 remote desktop port, 22 SSH port, etc., and cannot be closed through normal settings, it is likely that after the system is invaded, the attacker left a backdoor channel for subsequent continuous access or control of the device.

Third, what are the abnormal signs of account authority when the system is invaded?

account is the entrance to access the system, after the system is hacked, attackers usually tamper with account permissions or create hidden accounts, in order to obtain long-term access to the system permissions, such anomalies require users to carefully check account info to find.

1, unfamiliar accounts or permission changes

view the system account list, if you find an unfamiliar administrator account, an ordinary account, or an account with lower permissions has been inexplicably upgraded to administrator permissions, and these accounts cannot be deleted normally, it can be determined that the system has been invaded. Attackers can bypass the normal verification process and access the system at any time to steal data by creating a hidden account or upgrading account permissions.

2, there is an abnormal log log

check the system login log, if there is a non-local login record of my operation, multiple login failure records, or abnormal login records during non-working hours, indicating that an attacker is trying to crack the account password, or has successfully invaded the system and login operation, such log records are direct evidence of system intrusion.

What are the abnormal signs of file data when the system is invaded?

data is the core asset of the system. After the system is invaded, the ultimate goal of the attacker is often to steal or tamper with the data. Therefore, the abnormality of the file data level is also an important intrusion symptom.

1, documents inexplicably lost or tampered with

if it is found that important documents, photos, videos and other files stored are inexplicably lost, or the file content is tampered with, the file name is modified, and cannot be retrieved through Recycle Bin or data recovery tools, it may be that after the system is invaded, the attacker deletes or tampered with the data to cover up traces, or implements ransomware attacks through encrypted files.

2, unfamiliar encrypted files or blackmail letters

suddenly appear in the system a large number of unfamiliar suffix encrypted files, while the desktop or folder appeared in TXT, PDF format saved ransomware, demanding to pay the ransom to unlock the file, which is a typical system was invaded after the ransomware attack symptoms, such attacks will lead to core data can not be normal access, causing serious business losses.

To sum up, the symptoms of system intrusion cover multiple levels such as devices, networks, accounts, files, etc. From device cards, abnormal traffic to account changes, data tampering, every abnormal signal may be a risk warning. Daily to develop regular monitoring of system status, check the habit of log records, once the above signs are found, timely measures such as network disconnection, virus detection, and reset permissions can effectively reduce the security losses caused by system intrusion.