The rain slicked the avenues, mirroring the digital grime of a case gone cold. Sina Keissar, a ghost in the machine, remains at large, wanted by the FBI for a conspiracy that reached into the heart of American finance over a decade ago. From 2011 to 2013, Keissar allegedly spearheaded a campaign of digital assaults – Distributed Denial of Service attacks – aimed at crippling the U.S. financial sector and other vital companies. He wasn’t some lone script kiddie, either. This was a calculated operation, allegedly orchestrated on behalf of the Islamic Revolutionary Guard Corps, Iran’s shadowy cyber warfare arm.
Keissar, born in Iran on May 20th, 1990, wasn’t hacking from a basement bedroom. He was an employee of Mersad, a private “computer security” firm – a polite term for a digital mercenary group, if you ask me – based in Tehran. The feds believe Mersad was the IRGC’s tool, and Keissar, a key operative, procuring the means to wage war in the cloud. A slender build, around 5’8” and 150 pounds, with unremarkable brown eyes and hair, he blends into a crowd. But don't mistake his appearance for harmlessness. This man is considered an international flight risk, a pawn in a larger geopolitical game, and a threat to our digital infrastructure.
The attacks weren't just about disruption; they were about probing defenses, testing vulnerabilities, and establishing a foothold. Each successful denial of service, each moment of chaos, was a lesson learned, a step toward a potential future disruption that could have far graver consequences. The FBI believes Keissar is now back in Iran, likely shielded by the very forces he served. But the hunt continues, a slow burn across continents and encrypted networks.
A substantial reward is offered for information leading to his capture. The Bureau isn’t just looking to check a name off a list; they want to dismantle the network that supported him, expose the methods he used, and send a message that cyber warfare will not go unpunished. The trail has gone cold, but the digital footprints remain, whispering of a man who weaponized code and traded in chaos.
If you have any information regarding the whereabouts of Sina Keissar, no matter how insignificant it may seem, contact the FBI immediately. Don't let this ghost fade into the digital shadows. Your tip could be the key to bringing him to justice.
🔠Key Facts
| Full Name | Sina Keissar |
| Charges | Conspiracy to Commit, and Aid and Abet, Computer Intrusion |
| Aliases | None known |
| Date of Birth | May 20, 1990 |
| Race / Sex | white / Male |
| Nationality | Iranian |
| Height | 5'8" |
| Weight | 150 lbs |
| Eyes / Hair | brown / brown |
| Scars & Marks | None reported |
| Location | New York |
📋 Source: FBI Most Wanted — Sina Keissar
If you have information about this fugitive, contact your local FBI field office or submit a tip at tips.fbi.gov.