high severity March 16, 2023 · 3 min read Unverified claim — what this is

mandirisekuritas.co.id Listed by lockbit3 Ransomware Group

If you are a customer of mandirisekuritas.co.id, here’s what is being claimed, and what it would mean for you.

Mandiri Sekuritas merupakan mitra investasi tepercaya yang menyediakan solusi pasar modal komprehensif dengan beragam produk dan layanan unggulan
— from LockBit’s own leak-site posting. This is the group’s claim, quoted verbatim; it is not GalaxyWarden’s reporting and has not been independently verified.

mandirisekuritas.co.id Listed by lockbit3 Ransomware Group

On March 16, 2023, Indonesian investment firm Mandiri Sekuritas appeared on the LockBit 3.0 ransomware leak site, claiming that its internal files had been exfiltrated during a ransomware attack. The listing indicates that anyone whose personal or financial data was held by the company may now face heightened risk of identity theft, account takeover, or targeted fraud.

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Reported Details from the Listing

The LockBit 3.0 leak site entry states that Mandiri Sekuritas suffered a ransomware incident in which attackers successfully exfiltrated internal files. The disclosure does not quantify the number of affected records, list specific data types beyond “internal files,” or reveal any ransom demand. It simply marks the company as having been compromised and lists the domain mandirisekuritas.co.id. No customer notification letter or regulatory filing has surfaced publicly that adds further granularity, so the exact scope of exposed customer information remains unknown to the public.

Why This Matters for You and Your Family

If you or any member of your household maintains an investment account, has traded securities, or supplied identity documents through Mandiri Sekuritas, your personal data may have been taken. Investment firms routinely hold full names, addresses, tax identification numbers, bank account details, transaction histories, and scanned copies of passports or national IDs. When such records leave the company’s control, they become raw material for identity thieves who can open fraudulent accounts, file fake tax returns, or impersonate you with banks and brokers. Even if the leak site does not publish every file, the mere confirmation that data was allegedly stolen changes your risk profile immediately.

The Doxxing and Identity-Chain Risk

Ransomware groups rarely stop at one dataset. A single leaked email or phone number from an investment portal can be chained with credentials from earlier breaches, gaming accounts, or social-media profiles to build a complete picture of you and your family. Children’s usernames or shared family email addresses are especially dangerous because gaming platforms often reuse the same passwords or recovery details. Once attackers link these handles to a real-world identity and home address, harassment, SIM-swapping, and physical threats become realistic. Credential leaks like this one cascade into account takeovers and doxxing chains that can unfold over months.

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Found on people-search siteswe remove these

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value redacted in this sampleage, relatives, address historySpokeo

value redacted in this samplephone, household, property recordsBeenVerified

value redacted in this sample580 companies checked

Found in breach recordsverifiedreported — unverified

Each record is labeled: confirmed breach data, or an attacker’s claim no one has verified.

verifiedvalue redacted in this samplepassword + phone · 2024telecom breach

unverifiedvalue redacted in this sampleclaimed in ransomware listing · 2026leak-site claim

Leaked data cannot be deleted from the internet — anyone claiming otherwise is lying. Broker listings can be removed. We do the second, and show you exactly what to fix from the first.

Report details & sourcing

Attributed to LockBit · 3412 incidents tracked →

Severity High the filing does not enumerate what was exposed

Disclosed March 16, 2023

Last reviewed August 8, 2026

Affected Unconfirmed

By GalaxyWarden Threat Research · Editorial & sourcing standards

Unverified claim — what this report is

This page documents a public listing on a ransomware/extortion group’s leak site, tracked via public threat-intelligence sources. A listing is the attacker’s claim. GalaxyWarden aggregates and reports such claims; we have not independently verified that a breach occurred, what data (if any) was taken, or the accuracy of anything the group asserts, and the named organisation has not necessarily confirmed the incident. Sections above describe what the listing shows and the group’s documented history — not verified findings about the named organisation. If you represent this organisation and believe anything here is inaccurate, tell us and we’ll review it promptly.

Editorial & sourcing policy

GalaxyWarden is a breach-monitoring service and news aggregator. We do not exfiltrate, host, purchase, or redistribute stolen data. Breach information is compiled from publicly accessible sources and threat-intelligence platforms, and is reported as claims attributed to their source. We promptly correct or remove material shown to be inaccurate — see our content & takedown policy or write to support@galaxywarden.com.

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LockBit — 3412 incidents tracked

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