Agent Tesla and Formbook Hit Polish Businesses

Information-stealing malware such as Agent Tesla and Formbook is a long-running threat to small and mid-sized businesses everywhere, including in Poland. These tools quietly collect passwords, browser data and keystrokes, and they usually arrive through ordinary looking email attachments.

How these stealers work

Both families are sold as ready-made kits, so even low-skill criminals can run campaigns. A victim opens a document or archive, a hidden script runs, and the malware starts recording credentials and sending them to a remote server. Because it runs quietly, infections can go unnoticed for weeks.

Why businesses are targeted

Companies hold payment details, customer data and access to cloud services. A single stolen mailbox password can be used to impersonate staff, redirect invoices or break into other systems. Invoices, shipping notices and purchase orders are common lures because employees open them routinely.

Warning signs to watch for

Unexpected password reset emails, logins from unfamiliar countries, security software that switches itself off and slow computers after opening an attachment are all worth investigating. Treat any of them as a reason to isolate the device and change passwords from a clean machine.

Practical defences

Block risky attachment types such as scripts and macro-enabled files, keep endpoint protection updated and apply multi-factor authentication to every account. Stolen passwords are far less useful when a second factor is required.

Training and response

Short, regular awareness sessions help staff spot fake invoices. Prepare a simple response plan so everyone knows to disconnect the device, report the incident and reset credentials quickly.

Key takeaways

• How these stealers work: Both families are sold as ready-made kits, so even low-skill criminals can run campaigns. A victim opens a document or archive, a hidden script runs, and the malware starts recording credentials and sending them to a remote server.
• Why businesses are targeted: Companies hold payment details, customer data and access to cloud services. A single stolen mailbox password can be used to impersonate staff, redirect invoices or break into other systems.
• Warning signs to watch for: Unexpected password reset emails, logins from unfamiliar countries, security software that switches itself off and slow computers after opening an attachment are all worth investigating. Treat any of them as a reason to isolate the device and change passwords from a clean machine.
• Practical defences: Block risky attachment types such as scripts and macro-enabled files, keep endpoint protection updated and apply multi-factor authentication to every account. Stolen passwords are far less useful when a second factor is required.
• Training and response: Short, regular awareness sessions help staff spot fake invoices. Prepare a simple response plan so everyone knows to disconnect the device, report the incident and reset credentials quickly.

Frequently asked questions

What is Agent Tesla?

Agent Tesla is a commercial-style information stealer that records keystrokes, screenshots and saved passwords, then sends them to the attacker.

Does antivirus stop Formbook?

Good endpoint protection detects many variants, but new builds appear often, so combine it with email filtering and multi-factor sign-in.

Final thoughts

Stealer malware relies on habit and haste rather than advanced hacking. Careful email handling, layered protection and quick reporting remove most of its advantage.