File and Directory Permissions Modification

Adversaries may modify file or directory permissions to evade defenses.

Cryptocurrency Miner

Makes network request to known mining pool URL.

Executes dropped EXE

Modifies the /etc/hosts DNS resolution file

Modifying the /etc/hosts name-resolution file changes IP routing, which can facilitate traffic hijacking or the blocking of (security update) endpoints.

Checks hardware identifiers (DMI)

Checks DMI information which indicate if the system is a virtual machine.

Creates/modifies Cron job

Cron allows running tasks on a schedule, and is commonly used for malware persistence.

Creates/modifies environment variables

Creating/modifying environment variables is a common persistence mechanism.

Disables SELinux

Disables SELinux security module.

Enumerates active TCP sockets

Gets active TCP sockets from /proc virtual filesystem.

Enumerates running processes

Discovers information about currently running processes on the system

Modifies systemd

Adds/ modifies systemd service files. Likely to achieve persistence.

Reads hardware information

Accesses system info like serial numbers, manufacturer names etc.

Removes the immutable protection flag from a file

Uses chattr to remove the immutable flag from a file, allowing previously write-protected files to be modified or deleted.

Write file to user bin folder

Modifies Bash startup script

UPX packed file

Detects executables packed with UPX/modified UPX open source packer.