INCIDENT: Complete State Postal System Outage in Bulgaria

A major Russian-originated ransomware attack occurred on the Bulgarian State Post Office system. Hackers moved laterally into all IT and OT systems affecting all 26 services offered.

Besides affecting systems for payment and transfer of money, pensions, etc, the sending and receiving of post, domestic and international was interrupted for weeks. After a time, post could be received but only if the recipient did not owe amounts at time of delivery.

Incident Date

April 16, 2022



Estimated Cost

unknown - Complete state postal system outage - halting postal delivery, for 2+ weeks

Type of Malware:

No Malware identified

Threat Source:

No threat source identified


  • Poor cyber defense and delayed reaction to hacking have led to massive damage to Bulgarian Posts
  • The Work of Bulgarian Posts remains Blocked for Two Weeks




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