“Boss, did you… approve this change?”
Admin/CEO Account Hijacking
The problem began with this single remark from the settlement manager.
• The settlement account had been changed
• The order details were double the actual amount
• The payroll payment amounts also seemed suspicious
However, upon checking the logs, it was found that all changes had been processed normally using the ‘CEO account.’
“I never did that?”
From this moment on, the situation shifts from a simple hacking incident to a business accident.
The hijacking of an administrator or CEO account is the most fatal attack, capable of destroying all operations—from accounting and payroll to orders and contracts—in a single instance.
Why are administrator and CEO accounts the most dangerous?
They are on a completely different level compared to regular user accounts. What is possible when an administrator account is compromised
• Changing settlement accounts
• Manipulating salaries and allowances
• Creating fake orders
• Modifying contract terms
• Granting permissions and deleting logs
The compromise of just a single account equals damage equivalent to an internal incident
A bigger problem is that such incidents are often classified as ‘internal negligence’ rather than external hacking.
How did the actual attack begin?
The app involved in the incident was a business app designed to manage POS, settlements, and orders for business owners all at once.
The attack flow was very simple:
1. Fake login overlay
- Displays the same login screen when the legitimate app is launched
2. Keylogging
- Steals ID and password input values
3. Legitimate login
- From the server's perspective, it is a perfect administrator login
4. Abuse of administrator privileges
- Changing settlement accounts
- Registering fake orders
- Manipulating salary figures
There were no abnormalities on the server. Logins, requests, and processing were all normal.
The problem was not the server, but the ‘app execution environment, input, and screen.’
What was the core security issue? The essence of this incident is clear.
“Administrator authentication was performed, but the administrator ‘environment’ was not verified.”
Specific Security Gaps
• Absence of detection of fake login screens
• No detection of keylogging or overlay attacks
• Unverified trust in the administrator account’s execution environment
• Insufficient detection of anomalies regarding behavior after hijacking
In other words, they saw who logged in, but they did not see the environment in which they logged in.
How did LIAPP defend against this?
The service did not strengthen password policies or make the administrator UX inconvenient.
Instead, it applied ‘environment-based security’ to the administrator account.
• Detection of login screen overlays
• Detection of keylogging-based input hijacking
• Blocking the execution of modified or repackaged apps
• Immediate blocking of security threat environments upon administrator login
• Restrictions on settlements, payroll, and account changes in high-risk environments
What changed after implementation?
The results after the security was applied were clear.
• Preemptively blocking administrator account hijacking incidents
• Sharp decline in customer service related to settlement and payroll
• Reduction in cases of misidentification of internal incidents
• Minimization of audit and legal risks
Above all, the most significant change was this:
The establishment of the perception that “the CEO’s account is the company’s asset.”
Lessons from this case:
Most business app security incidents originate in the app execution environment, not the server.
• The administrator login screen
• Input methods
• The running app environment
If these three elements are not protected, incidents will recur no matter how robust the server is.
Admin and CEO accounts are not security options; they are the ‘business infrastructure.’
Therefore, LIAPP, LISS, and LIKEY are not choices, but essential equipment for business apps.
#BusinessApp #CEOApp #AdminAccountSecurity #POSSecurity #ERPSecurity #SettlementSecurity #PayrollSecurity #InternalIncident #AppSecurity #MobileSecurity #AccountHijacking #SecurityIncident #LIAPP #LISS #LIKEY
