A recently discovered Linux malware with backdoor capabilities has flown under the radar for years, allowing attackers to harvest and exfiltrate sensitive information from compromised devices.
If you target a binary for dropping a backdoor you usually want to build a binary that runs everywhere. My guess is that they could figure out how to build a drop-in systemd that they could compile once and worked on all major distros. This would be much harder with the kernel itself.
Regarding how it is setup: Often backdoors & exploits are sold in packages and combined when attacking the victims. Depending on the group behind the specific attack, the exploit used for setup may be different on each deployment.
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If you target a binary for dropping a backdoor you usually want to build a binary that runs everywhere. My guess is that they could figure out how to build a drop-in systemd that they could compile once and worked on all major distros. This would be much harder with the kernel itself.
Regarding how it is setup: Often backdoors & exploits are sold in packages and combined when attacking the victims. Depending on the group behind the specific attack, the exploit used for setup may be different on each deployment.