What to Do When You're Prompted to Install an App? Steps to Block Malicious Apps and Remote Control
Collection Finance 2026.07.25

What to Do When You're Prompted to Install an App? Steps to Block Malicious Apps and Remote Control

8 Steps to Stop Malicious Apps and Screen Sharing Requests and Protect Your Account with a Safe Device

What should you do when prompted to install an app? In situations involving blocked malicious apps and remote control, it’s easy to feel like it’s real when you hear the name of the organization, incident number, and your personal information. However, the key indicator of whether it’s true isn’t how much the other party knows but if you can hang up and independently verify through an official number.

This list organizes the channels and actions needed to stop malicious apps and screen sharing requests, and protect your account with a secure device in 8 steps. We’ve based it on not redialing the numbers or text links from the call screen, but rather using the official website and representative numbers found directly on another secure device.

Each item includes warning signs, immediate actions, verification channels, information to prepare, and precautions. We've differentiated the roles of the police, financial companies, telecommunications providers, and security agencies, and included follow-up measures to minimize additional damage even if you’ve already sent money or installed an app.

If reading with family, decide on a phrase like “I will hang up now and verify with the official number.” It’s also important not to make decisions alone and to have a habit of keeping records.

Stop Immediately Before Installation

Immediately Stop Before Installation

If an organization, delivery, or loan consultant instructs you to install an app, start verifying from this step. Even if the other party pushes, do not try to prove anything while continuing the call.

Stop downloading and granting permissions. The official channel is KISA (Korea Internet & Security Agency) National Damage Response, and if you organize the app name, download path, and required permissions before reporting, you can describe the situation more accurately.

Do not trust just because it says it’s in the official app store. Since the guidance screen and operating procedures may vary, proceed based on the connected official page.

위험 신호 기관·택배·대출 상담원이 앱 설치를 지시함 즉시 행동 다운로드와 권한 허용을 멈춥니다. 확인 채널 KISA 국민피해 대응 준비 정보 앱 이름·다운로드 경로·요구 권한 주의사항 공식 앱스토어에 있다는 말만으로 신뢰하지 않습니다.

End Screen Sharing and Remote Control

Terminate Screen Sharing and Remote Control

If the other party demands screen sharing or remote control while offering help, start verifying from this step. Even if the other party pushes, do not try to prove anything while continuing the call.

End the session and cut off contact with the other party. The official channel is KISA, and if you organize the app used, access code, and time before reporting, you can describe the situation more accurately.

Do not resend the access code. Since the guidance screen and operating procedures may vary, proceed based on the connected official page.

위험 신호 상담을 돕겠다며 화면 공유나 원격제어를 요구함 즉시 행동 세션을 종료하고 상대와 연락을 끊습니다. 확인 채널 KISA 준비 정보 사용 앱·접속 코드·시각 주의사항 접속 코드를 다시 전달하지 않습니다.

Disconnect the Network of the Suspicious Device

Disconnect the Network of Suspicious Devices

If you notice unusual symptoms like pop-ups, overheating, or call interception after installation, start verifying from this step. Even if the other party pushes, do not try to prove anything while continuing the call.

Turn off Wi-Fi and mobile data, and stop using the device. The official channel is KISA 118, and if you organize the installation time, symptoms, and app list before reporting, you can describe the situation more accurately.

Do not call the bank or police using that device. Since the guidance screen and operating procedures may vary, proceed based on the connected official page.

위험 신호 설치 후 팝업·발열·통화 가로채기 등 이상이 생김 즉시 행동 와이파이와 모바일 데이터를 끄고 기기 사용을 멈춥니다. 확인 채널 KISA 118 준비 정보 설치 시각·증상·앱 목록 주의사항 해당 기기로 은행이나 경찰에 전화하지 않습니다.

Report from Another Safe Device

Report Using Another Secure Device

If you’re unsure whether you can connect to a legitimate organization from the suspicious device, start verifying from this step. Even if the other party pushes, do not try to prove anything while continuing the call.

Contact 112 and financial companies from a separate phone. The official channels are the police and financial companies, and if you organize identification information and relevant account details before reporting, you can describe the situation more accurately.

Use the official representative number instead of search ad numbers. Since the guidance screen and operating procedures may vary, proceed based on the connected official page.

위험 신호 의심 기기에서 전화가 정상 기관으로 연결되는지 확신할 수 없음 즉시 행동 별도 전화로 112와 금융회사에 연락합니다. 확인 채널 경찰청·금융회사 준비 정보 본인 확인 정보·관련 계좌 주의사항 검색광고 번호 대신 공식 대표번호를 사용합니다.

Request Temporary Blocking of Financial Transactions

If you’ve exposed certificate, security card, or password screens, start verifying from this step. Even if the other party pushes, do not try to prove anything while continuing the call.

Request electronic financial transaction blocking and inspection from financial companies. The official channels are the Financial Supervisory Service's “Fine” and the transaction financial companies, and if you organize account, card, and exposed authentication tools before reporting, you can describe the situation more accurately.

Do not end actions by just changing passwords. Since the guidance screen and operating procedures may vary, proceed based on the connected official page.

위험 신호 인증서·보안카드·비밀번호 화면을 노출했음 즉시 행동 금융회사에 전자금융 거래 차단과 점검을 요청합니다. 확인 채널 금융감독원 파인·거래 금융회사 준비 정보 계좌·카드·노출된 인증수단 주의사항 비밀번호 변경만으로 조치를 끝내지 않습니다.

Get Guidance on Malicious Apps from 118

Receive Guidance on Malicious App Action from 118

If you find it difficult to understand the deletion method and evidence preservation order, start verifying from this step. Even if the other party pushes, do not try to prove anything while continuing the call.

After consulting with 118, follow the guidance for checks. The official channel is KISA 118, and if you organize model, operating system, and app name before reporting, you can describe the situation more accurately.

Check necessary records before random resetting. Since the guidance screen and operating procedures may vary, proceed based on the connected official page.

위험 신호 삭제 방법과 증거 보존 순서를 알기 어려움 즉시 행동 118 상담 후 안내에 따라 점검합니다. 확인 채널 KISA 118 준비 정보 기종·운영체제·앱 이름 주의사항 임의 초기화 전에 필요한 기록을 확인합니다.

Change Password on a Clean Device

Change Passwords on a Clean Device

If you’re using the same password for email, messenger, and financial accounts, start verifying from this step. Even if the other party pushes, do not try to prove anything while continuing the call.

Change the passwords of core accounts to different ones. The official channel is the personal information portal, and if you organize the exposed account list and recovery methods before reporting, you can describe the situation more accurately.

Do not change passwords on suspected infected devices. Since the guidance screen and operating procedures may vary, proceed based on the connected official page.

위험 신호 메일·메신저·금융 계정이 같은 비밀번호를 사용함 즉시 행동 핵심 계정부터 서로 다른 비밀번호로 변경합니다. 확인 채널 개인정보 포털 준비 정보 노출 계정 목록·복구 수단 주의사항 감염 의심 기기에서는 변경하지 않습니다.

Check Your Communication Subscription Status

Check Communication Subscription Status

If identification documents and identity verification information are also exposed, start verifying from this step. Even if the other party pushes, do not try to prove anything while continuing the call.

Check the lines under your name and review subscription restrictions. The official channel is Msafer, and if you organize joint and financial authentication methods before reporting, you can describe the situation more accurately.

Ensure you authenticate directly and handle it through official services. Since the guidance screen and operating procedures may vary, proceed based on the connected official page.

위험 신호 신분증과 본인인증 정보도 함께 노출됨 즉시 행동 본인 명의 회선을 조회하고 가입제한을 검토합니다. 확인 채널 Msafer 준비 정보 공동·금융 인증수단 주의사항 본인이 직접 인증해 공식 서비스에서 처리합니다.

What should you do when prompted to install an app? The key to responding to steps for blocking malicious apps and remote control is to stop transactions and device manipulations, and change your verification routes. By executing the 8 steps in order to stop malicious apps and screen sharing requests, and protect your account with a safe device, you can reduce the time spent wavering. However, please note that reporting or stopping payments does not guarantee refunds.

Keep records of the time of calls, transfers, and app installations, along with the other party's number, account number, and chat screen. Do not log into financial apps on suspected infected phones and verify the official representative number directly from another secure device.

After initial measures, check account, loan, and mobile phone activation statuses and change any exposed passwords on a clean device. Also, watch for unfamiliar authentication messages, small payments, and new account notifications for a certain period.

When making an actual report, prioritize the latest official guidance. There are secondary scams that may attempt to re-approach you under the pretense of property recovery or refund agency, so do not respond to requests for prepayment or remote control. Procedures and operating hours may change, so verify the connected official guidance just before execution again.

한눈에 보기 8개
Stop Immediately Before Installation
기관·택배·대출 상담원이 앱 설치를 지시함 · 다운로드와 권한 허용을 멈춥니다. · KISA 국민피해 대응 · 앱 이름·다운로드 경로·요구 권한 · 공식 앱스토어에 있다는 말만으로 신뢰하지 않습니다.
End Screen Sharing and Remote Control
상담을 돕겠다며 화면 공유나 원격제어를 요구함 · 세션을 종료하고 상대와 연락을 끊습니다. · KISA · 사용 앱·접속 코드·시각 · 접속 코드를 다시 전달하지 않습니다.
Disconnect the Network of the Suspicious Device
설치 후 팝업·발열·통화 가로채기 등 이상이 생김 · 와이파이와 모바일 데이터를 끄고 기기 사용을 멈춥니다. · KISA 118 · 설치 시각·증상·앱 목록 · 해당 기기로 은행이나 경찰에 전화하지 않습니다.
Report from Another Safe Device
의심 기기에서 전화가 정상 기관으로 연결되는지 확신할 수 없음 · 별도 전화로 112와 금융회사에 연락합니다. · 경찰청·금융회사 · 본인 확인 정보·관련 계좌 · 검색광고 번호 대신 공식 대표번호를 사용합니다.
Request Temporary Blocking of Financial Transactions
인증서·보안카드·비밀번호 화면을 노출했음 · 금융회사에 전자금융 거래 차단과 점검을 요청합니다. · 금융감독원 파인·거래 금융회사 · 계좌·카드·노출된 인증수단 · 비밀번호 변경만으로 조치를 끝내지 않습니다.
Get Guidance on Malicious Apps from 118
삭제 방법과 증거 보존 순서를 알기 어려움 · 118 상담 후 안내에 따라 점검합니다. · KISA 118 · 기종·운영체제·앱 이름 · 임의 초기화 전에 필요한 기록을 확인합니다.
Change Password on a Clean Device
메일·메신저·금융 계정이 같은 비밀번호를 사용함 · 핵심 계정부터 서로 다른 비밀번호로 변경합니다. · 개인정보 포털 · 노출 계정 목록·복구 수단 · 감염 의심 기기에서는 변경하지 않습니다.
Check Your Communication Subscription Status
신분증과 본인인증 정보도 함께 노출됨 · 본인 명의 회선을 조회하고 가입제한을 검토합니다. · Msafer · 공동·금융 인증수단 · 본인이 직접 인증해 공식 서비스에서 처리합니다.

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