Jam Tangan Data Breach
Status: Confirmed
Breach Intelligence Summary
Entity: Jam Tangan · Actor: Unknown · Source: Have I Been Pwned / ObscureIQ intelligence
Attack: Data Exfiltration via Under investigation
Timeline: Breach (Jul, 2021) · Reported (Nov, 2023) · Leak (11/27/23)
Exposure: 435K+ records · Email, IP addresses, Names, Passwords, Phone numbers, Physical addresses
Status: Confirmed · Risk: Moderate (Account takeover + Phishing / SIM swap)
Summary
In July 2021 the online Indonesian watch store Jam Tangan (AKA Machtwatch) suffered a data breach that exposed over 400k customer records which were subsequently posted to a popular hacking forum. The data included email and IP addresses names phone numbers physical addresses and passwords stored as either unsalted MD5 or bcrypt hashes.
About Jam Tangan
Jam Tangan is the organization affected by this breach. User data may have been generated through account creation, service usage, or business operations.
If you have interacted with Jam Tangan in any capacity, your data may be included in this breach.
Threat Actor: Unknown
The threat actor responsible for this breach has not been publicly identified or confirmed at this time.
- Under investigation
Breach Exploitation Status
Moderate
Status
Detected
Detected
Possible
Unknown
Unknown
3–5 years
Phone numbers and addresses change over time but remain valid long enough for sustained exploitation campaigns.
Data Points Exposed
Dark Web Verification
Status: Confirmed
- Dataset containing approximately 435K+ records has been identified in breach intelligence sources.
- The data is indexed and searchable across breach notification platforms.
Impact
This breach carries moderate risk due to the nature of exposed data fields and the scale of affected records.
- Targeted phishing referencing Jam Tangan accounts or services
- Credential stuffing against accounts sharing the same password
- SIM-swap attempts where phone numbers are present
- Physical mail scams and address-based identity verification fraud
- Data broker enrichment and resale
Recommendations for Impacted Individuals
If you believe your information may be included:
Non-clients may request a breach impact review.
Jam Tangan account updates
Password reset requests
Verify directly through official channels.
Email compromise is often the first pivot point.
Frequently Asked Questions
In Jul, 2021, Jam Tangan experienced a data breach that resulted in the exposure of approximately 435K+ records containing personal information.
The exposed data includes Email, IP addresses, Names, Passwords, Phone numbers, Physical addresses.
Approximately 435K+ records were affected based on current breach intelligence.
Yes. This breach is treated as confirmed based on data observed in breach intelligence platforms.
Data circulation has been detected across breach-sharing channels. Downstream exploitation risk exists based on the nature of the exposed fields.
Rotate passwords associated with Jam Tangan, enable multi-factor authentication on email and financial accounts, and monitor for suspicious activity.
Protect Yourself
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Corporate Accountability
Organizations that collect personal data have a duty to implement reasonable safeguards and to notify affected individuals when breaches occur.
Scope assessments may evolve as investigations continue. Users should not rely solely on early estimates when making risk decisions.
ObscureIQ Advisory
We combine proprietary dark web access with commercial and restricted breach intelligence to verify exposure and assess real-world risk.
- A public-facing individual
- A high-profile executive
- A customer of Jam Tangan
- Or simply concerned about credential reuse
We can confirm whether your information is circulating and evaluate downstream threat vectors.