FBI sanctions listing
GUAN TIANFENG
GUAN TIANFENG is an individual designated on the U.S. Federal Bureau of Investigation — Wanted (FBI) sanctions list under the Cyber's Most Wanted programme, listed on 2024-12-03. Cyber's Most Wanted. This page summarises the public designation — known aliases, Chinese nationality, identifying particulars, the stated reason for listing and linked parties — alongside an independent, transparent risk indicator.
Reason for listing
Conspiracy to Commit Computer Fraud; Conspiracy to Commit Wire Fraud Guan Tianfeng is wanted for his alleged role in conspiring to access Sophos firewalls without authorization, cause damage to them, and retrieve and exfiltrate data from both the firewalls themselves and the computers behind these firewalls. The exploit was used to infiltrate approximately 81,000 firewalls. It is alleged that Guan Tianfeng's role in the conspiracy was to develop and test the zero-day vulnerability used to conduct the attack. A federal arrest warrant was issued for Guan Tianfeng in the United States District Court, Northern District of Indiana, Hammond Division, after he was charged with conspiracy to commit computer fraud and conspiracy to commit wire fraud. The Rewards For Justice Program, United States Department of State, is offering a reward of up to $10 million for information on Guan Tianfeng, Sichuan Silence Technology Company Ltd., associated individuals or entities, or their malicious cyber activity.
Statement of reasons as published by US FBI. This is the issuing authority's wording, reproduced for reference.
Designation record
| List / authority | US FBI (FBI) — FBI — Cyber's Most Wanted |
|---|---|
| Entity type | Person |
| Programmes / regime | Cyber's Most Wanted |
| Date listed | 2024-12-03 |
| Source record ID | fbi:e2b25be8f1244943b138a748373da489 |
| Last updated (our copy) | 2026-06-04 |
Identity & particulars
| Position / role | Cyber's Most Wanted |
|---|---|
| Date of birth | January 7, 1994 |
| Place of birth | China |
| Nationality / country | Chinese |
| Gender | Male |
Known aliases (2)
Deep-research dossier
Not yet deep-researched
The instant review above is drawn from the public lists. A deep-research dossier goes much further — an analyst-grade OSINT report: associate & co-investment network screening, structural / ownership opacity, a dated risk trajectory, an 8-factor scoring model, and numbered, source-linked evidence. See the format in the design system.
Clarifications & right of reply
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Source & provenance
| Issuing authority | U.S. Federal Bureau of Investigation — Wanted |
|---|---|
| Source identifier | fbi:e2b25be8f1244943b138a748373da489 |
| Aggregated by | Sanctiometer (independent) — verify against the issuing authority's official list before acting. |