bankbsi.co.id Listed by lockbit3 Ransomware Group: Ransomware Claim — What’s Alleged & What To Do

On or around May 2023, the ransomware group known as lockbit3 listed bankbsi.co.id on its leak site, claiming responsibility for an attack on Bank Syariah Indonesia. Public reporting of the listing is dated May 12, 2023. The group asserted that it had struck on May 8, halted the bank’s services, and exfiltrated internal files. The number of people affected remains unknown, and independent confirmation of the full scope is limited.

For customers, partners, and staff of an Indonesian Islamic bank, any credible claim of internal-file theft and service disruption raises immediate questions about operational continuity and the possible exposure of sensitive records. What follows summarises only what has been stated in the available record and places it in clear context.

What happened

According to the lockbit3 listing reported on May 12, 2023, the group claimed it attacked Bank Syariah Indonesia on May 8 and completely stopped all of its services. The same claim states that internal files were exfiltrated in a ransomware attack. In the group’s own wording, bank management responded by telling customers and partners that the outage was “technical work,” a characterisation lockbit3 described as false. No verified public figure has been given for the volume of data taken, the precise systems affected, or the duration of any outage. The number of individuals whose information may have been involved is recorded as unknown. Method details beyond the ransomware-and-exfiltration claim are undisclosed.

Who is lockbit3?

Lockbit3 is the name used by a well-documented ransomware operation that has appeared repeatedly in public breach reporting since earlier LockBit iterations. Like other ransomware-as-a-service groups, it typically gains access to corporate networks, encrypts systems, and steals data before demanding payment, often threatening to publish the stolen material on a dedicated leak site if the victim does not pay. The group has been linked to numerous incidents across finance, manufacturing, and public-sector organisations worldwide. Its leak-site postings are claims made by the actors themselves; they are not independent verification that every asserted detail is accurate. In this case, the listing of bankbsi.co.id and the accompanying narrative about a May 8 attack and service stoppage should be read as the group’s unverified assertions unless corroborated by the organisation or regulators.

bankbsi.co.id and its sector

bankbsi.co.id is the online presence of Bank Syariah Indonesia, a major Islamic (Sharia-compliant) bank operating in Indonesia. Institutions of this type hold customer identity and contact data, account and transaction records, financing and deposit information, and internal operational and employee files. They also maintain connections with regulators, payment networks, and business partners. Because banking services are essential to daily financial life, any sustained disruption or credible theft of internal files can affect not only the institution’s reputation and continuity but also the confidence of depositors and the broader financial ecosystem in which it operates. A ransomware claim against such an organisation is therefore consequential even when the precise technical details remain limited in public sources.

What data was at risk

The available record states that internal files were exfiltrated in the ransomware attack. No further breakdown of data types—such as customer lists, account details, identity documents, or employee records—has been disclosed in the facts at hand. Organisations in the banking sector typically store substantial volumes of personal and financial information, authentication credentials, and proprietary operational material. Whether any of those categories were among the files the group claims to have taken is unconfirmed. Readers should treat the exposure as involving internal bank files whose exact contents have not been publicly itemised.

Why it matters

If internal files from a bank are copied by unauthorised parties, the practical risks include possible misuse of personal or financial information, targeted phishing or social-engineering attempts that reference real account or transaction details, and longer-term identity or fraud concerns for anyone whose data appears in the material. For the organisation, the incident raises issues of service availability, regulatory notification duties, forensic cost, and customer trust. Because the count of affected people is unknown and the precise file inventory is undisclosed, the scale of individual harm cannot yet be measured from public information alone. Calm monitoring of official bank and regulator statements remains the most reliable way to learn whether specific customer cohorts were involved.

If your data was in this claimed breach

Public detail on exactly whose information was taken is limited. If you hold accounts or have had dealings with Bank Syariah Indonesia, the following steps are prudent:

• Monitor account statements and transaction alerts for unfamiliar activity and report anomalies to the bank through official channels only.
• Treat unsolicited messages that reference the incident or urge urgent action with caution; verify any communication independently.
• Consider updating passwords and enabling stronger authentication on banking and related email accounts where available.
• Remain alert for phishing or impersonation attempts that may use stolen internal context.
• You can run a free exposure scan of your email address to check whether your information has already surfaced in known breach data sets.

Continue to rely on statements from the bank and relevant Indonesian authorities for confirmed guidance. The lockbit3 listing is a claim; further independent reporting may clarify what was actually taken and who, if anyone, needs to take additional protective measures.

AICompiled with AI assistance from public sources and published under our editorial standards.