Distributing Trojan horse programs disguised as legitimate software.

An IP used for the diffusion of unwanted emails.

A comment spammer recognized for generating mass posts across various blog platforms and forums. These posts invariably embed promotional links designed to attract user traffic and enhance search engine visibility.

Undertaking SQL injection attacks to manipulate a website’s database.

Sure, below are 50 possible suspicious activities a system administrator might identify. This is on top of the previous 20 examples already provided.

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The reference IP associated with a spam handler serves as a launchpad for mass discharging of unsolicited mails.

An IP used to circulate emails to validate their delivery, with the goal of compiling a list of valid emails.

An IP involved in generating spam posts on diverse forums, including links to specific websites, intended to increase human clicks and improve search engine positioning.

Important

This guy has been harrassing our train server for months now...

Changes in file modification times that don't match authorized changes.

An automated script that combs the web to find email addresses for spamming operations.

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A host operating a bot that tirelessly mines the rich veins of the internet, extracting email addresses to be used for spam.

The comment spammer is recognised for creating posts embedded with promotional links across forums and blogs. The purpose of these links is to increase viewer interactions and enhance the search engine ranking of the linked site.

An IP that delivers emails to confirm their receipt, thereby compiling a list of effective emails.

The specified IP, linked with a distinguished spammer, sets forth to distribute bulk emails to distinguish the active email IDs and accordingly generate a valid email list.

An IP used for the diffusion of unsolicited emails.

An IP used for the propagation of spam emails.

Frequent ‘HTTP 503’ Service Unavailable codes indicating potential DDoS attacks.

Using virtual currencies for illicit transactions.

Running malicious ad campaigns (malvertising).

Excessive uploads being made to the server.

The noted IP, linked with a spammer, supervises a regular digital mail bombing via non-consented messages.