Persistence

When attackers break into a network, they don’t want to lose access — even if the company discovers part of the intrusion.
So they create backup ways to get back in.

This is called persistence.

Persistence is when an attacker installs tools, accounts, or backdoors that let them stay in the environment — or return later — even after defenses are reset.

Think of it like a burglar who:

hides a spare key under the doormat
wedges a window so it won’t lock
installs a secret keypad code
or leaves a rope hanging from the roof

Even if you fix the original break‑in, they still have ways to re‑enter.

Digitally, attackers use persistence by:

creating new admin accounts
installing remote‑access tools
modifying startup scripts
abusing legitimate IT tools
planting scheduled tasks
hiding malware deep in the system

Why this matters for insurance:
Persistence is one of the biggest reasons incidents turn into prolonged, expensive claims.
A company may think they “removed the attacker,” but if persistence mechanisms remain, the attacker can:

re‑enter the network
restart ransomware deployment
continue stealing data
sabotage recovery efforts

When a company says they “cleaned up the incident,” the real question is:
“Did they check for persistence — and did they remove every way the attacker could get back in?”

The takeaway:
Persistence is how attackers maintain long‑term access.
If it isn’t found and removed, the incident isn’t truly over.

Spy / Crime Novel Parallel:
If you’ve read Tinker, Tailor, Soldier, Spy, the idea of a mole quietly remaining inside an organization — long after leadership thinks the threat is gone — mirrors exactly how digital persistence works. The danger isn’t the initial breach; it’s the hidden foothold that lets the attacker return at will.

Real‑World Example:
During the 2021 Microsoft Exchange attacks, the Hafnium group installed multiple persistence mechanisms, allowing them to maintain access even after initial cleanup — a reminder that without thorough eradication, attackers can simply walk back in.

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