Key facts
- Organisation
- A Singapore insurance firm
- Threat
- External attacker; perimeter firewall compromise and network-wide credential theft
- Initial access
- Brute-force of an internet-exposed firewall admin console with no MFA and no lockout policy
- Impact
- Every VPN credential exposed; firewall rules rewritten; staff cut off from cloud resources; hidden backdoor admin account planted
- Core issue
- The firewall's configuration backup stored all passwords under a fixed, publicly known key, turning one admin compromise into a network-wide credential loss
What this case shows
- An internet-facing management console with no MFA and no lockout is one lucky guess away from full control.
- A configuration backup is not a harmless file. If the credentials inside it are weakly encrypted, a single download exposes everyone.
- An attacker who can edit firewall rules can also switch off the logging that would reveal them.
- Firmware "above the affected version" is not the same as patched; inherited weaknesses survive upgrades.
Wondering whether an exposed device has already been touched? Start with a Compromise Assessment, or keep responders on standby with Blackpanda IR-1.
What this would have cost without Blackpanda IR-1 in place
| ODIR | IR-1 | |
|---|---|---|
| Type of engagement | On-demand incident response | Yearly subscription |
| Hours covered | 35.5 hours | Unlimited* |
| Pricing1 | USD $17,750 | USD $1,775 |
* Unlimited for one incident per year
1 Ad-hoc incident response pricing based on average market rates, from USD 500 per hour. Blackpanda IR-1 subscription pricing based on no. of endpoints, costing approx. 10x less than ad-hoc and retainer-based incident response. All figures are illustrative only, for guidance and marketing purposes and not to be relied upon by the reader. Actual incident response costs vary by scope, complexity, and provider.
CHALLENGE
A Singapore insurance firm ran its network behind a single perimeter firewall. The management console sat open to the internet, reachable by anyone who found the address. No multi-factor authentication guarded it. No lockout stopped repeated login attempts. And one administrator password had not changed in more than four years.
In April 2026, an attacker began guessing. Hundreds of failed logins piled up against a single admin account, none of them blocked, until one finally worked. With full control of the firewall, the attacker reached for the most valuable thing it held: a complete configuration backup. Inside that file, every user's password — credentials for more than 70 VPN accounts among them — sat encrypted under a fixed key that is identical on every device of its type and has been public for years. Downloading the file was enough. The attacker could now read every password offline, without touching the network again.
What looked at first like one compromised login was, in fact, the loss of the entire credential set. Staff noticed only when they could no longer reach the company's cloud resources, the visible symptom of an intrusion that had already burrowed deep.
SOLUTION
1. Contained the active intrusion and preserved the evidence
Blackpanda's first task was to stop the bleeding without destroying the record. The team identified the attacker's live access paths, secured the firewall's logs before they could be altered further, and collected the configuration files, event logs, and VPN session data that would anchor the investigation.
2. Reconstructed how the attacker got in
Working backward from the first confirmed compromise, Blackpanda traced the break-in to a brute-force campaign against the internet-facing admin console. The logs pinpointed the moment a guessed password succeeded, and the absence of any lockout policy that would have cut the attempt short.
3. Found the mechanism that turned one account into all of them
The pivotal discovery was the configuration backup. Blackpanda confirmed that the firewall stored every credential under a static, publicly known key, and that this weakness had survived a firmware upgrade the device's version number suggested it should have escaped. One download had handed the attacker the entire password set.
4. Mapped the full extent — movement, sabotage, and persistence
Blackpanda followed the attacker from the firewall into the internal network: authenticated VPN sessions from overseas, a rapid sweep that reached more than 250 internal systems in minutes, five deliberate edits to firewall rules that masked traffic and switched off logging, and a hidden administrator account planted for re-entry. The team also established what left the network — configuration backups, pulled four separate times — and, just as important, what did not. No business-data theft appeared in the available logs.
RESULTS
1. A complete, attributable timeline
Blackpanda delivered an hour-by-hour account of the intrusion, from the first guessed password to the final backdoored session, each action tied to specific log evidence.
2. Every compromised credential identified
The investigation confirmed exactly which accounts the attacker held, administrator and VPN alike, so the firm could reset the right credentials instead of guessing.
3. The hidden backdoor exposed
A rogue administrator account, created to preserve access independent of the original compromise, was found and flagged for immediate removal.
4. A clear containment and hardening path
Blackpanda's recommendations covered both the immediate cleanup — revert the malicious rule changes, rotate every credential, remove the backdoor — and the structural fixes that prevent a repeat: enforce MFA, pull the management console off the public internet, add lockout and geographic restrictions, and forward logs to a tamper-resistant system that alerts the moment logging is touched.
The instructive part of this case is not the guessed password; it is everything the password unlocked. A management interface open to the internet, a credential store anyone could decrypt, and logging an intruder could quietly disable — each was survivable alone, but together they let one weak password escalate into a network-wide compromise. The organisations least likely to repeat it are the ones that treat a configuration backup as sensitive as the network it describes, and that assume any internet-facing admin portal will eventually be found.
FREQUENTLY ASKED QUESTIONS
1. How did attackers get in if the passwords were encrypted?
The password on the admin account was weak and years old, so it fell to simple guessing. The encryption that mattered was elsewhere — inside the firewall's configuration backup, where every credential was scrambled with a fixed key that is publicly known. Encryption only protects you when the key is secret.
2. Would multi-factor authentication have stopped this?
It would have helped, because credentials alone would no longer have been enough to log in. But MFA is one layer. This case turned on several missing controls at once — no lockout, an exposed console, a decryptable backup — which is why Blackpanda favours layered hardening over any single fix.
3. The firewall ran a newer version than the one with the known flaw. Why was it still vulnerable?
Because the way the device stored passwords carried over when the firmware was upgraded. A version number above the officially affected range is not the same as being patched against an inherited weakness. Confirming that distinction meant examining the actual configuration, not the version label.
4. Was any customer or business data stolen?
In the logs available, Blackpanda found no evidence of business-data theft; the confirmed exfiltration was limited to firewall configuration backups holding credentials and network architecture. The attacker had also disabled logging on one internal path, so absence of evidence is not the same as evidence of absence — one reason a thorough forensic investigation matters.
5. How would we know if this had already happened to us?
Often you don't, until something visible breaks — here, staff losing access to their cloud. A Compromise Assessment looks for the quieter signs: unexpected admin accounts, altered rules, logins from unusual places, and the gaps where logging should be.
6. What should we do first if we suspect our firewall is compromised?
Treat every credential it stored as exposed, and get expert eyes on the evidence before changing anything that might erase it. The first hours decide how much you can reconstruct, which is why a response team on retainer shortens the distance between discovery and containment.
WHAT THIS MEANS FOR YOUR ORGANISATION
Perimeter devices have quietly become prime targets, precisely because they sit at the edge, are often forgotten after installation, and hold the keys to everything behind them. The pattern here — exposed console, stale credentials, a configuration file that doubles as a password vault — repeats across organisations that bought a firewall years ago and assumed the box would keep protecting itself. It will not.
Two moves close most of this gap. Take administrative interfaces off the public internet and put strong authentication in front of whatever remains; then treat configuration backups as crown-jewel data, stored and encrypted accordingly. For organisations without an in-house forensics capability, the faster route to that posture is a standing relationship with responders who can assess exposure now and move immediately when something slips. That is the role Blackpanda IR-1 is built to play.
ABOUT BLACKPANDA
Blackpanda is a Lloyd's of London–accredited insurance coverholder and Asia's leading local cyber incident response firm, delivering end-to-end digital emergency support across the region. We are pioneering the A2I (Assurance-to-Insurance) model in cybersecurity — uniting preparation, response, and insurance into a seamless pathway that minimises financial and operational impact from cyber attack. Through expert consulting services, response assurance subscriptions, and innovative cyber insurance, we help organisations get ready, respond, and recover from cyber attacks — all delivered by local specialists working in concert.
Our mission is clear: to bring complete cyber peace of mind to every organisation in Asia, from the first moment of breach through full recovery and beyond.
