Exploit.Script.CVE-2021-26855

Parent class: Malware

Malicious tools are malicious programs designed to automatically create viruses, worms, or Trojans, conduct DoS attacks on remote servers, hack other computers, etc. Unlike viruses, worms, and Trojans, malware in this subclass does not present a direct threat to the computer it runs on, and the program’s malicious payload is only delivered on the direct order of the user.

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Class: Exploit

Exploits are programs that contain data or executable code which take advantage of one or more vulnerabilities in software running on a local or remote computer for clearly malicious purposes. Often, malicious users employ an exploit to penetrate a victim computer in order to subsequently install malicious code (for example, to infect all visitors to a compromised website with a malicious program). Additionally, exploits are commonly used by Net-Worms in order to hack a victim computer without any action being required from the user. Nuker programs are notable among exploits; such programs send specially crafted requests to local or remote computers, causing the system to crash.

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Platform: Script

A script is a program or set of actions used to automate a task. Many different scripting languages exist.

Description

This family consists of malicious files that exploit the server-side request forgery (SSRF) vulnerability CVE-2021-26855. These files allow to send arbitrary HTTP requests and authenticate themselves as Microsoft Exchange Server.

Top 10 countries with most attacked users (% of total attacks)

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Find out the statistics of the vulnerabilities spreading in your region on statistics.securelist.com