The person at the center of this case
United States financial sector and companies
Cold Case · Open
10 years waiting · since 2016
SINA KEISSAR
Justice for United States financial sector and companies — the trail went cold in 2016, but the truth hasn't.
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Key leads to think about
🎯
suspect
Lead #1What was Keissar's specific technical role in executing the botnet commands during the DDoS attacks?
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evidence
Lead #2How were the U.S.-based servers procured and what records exist of their acquisition and use?
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person
Lead #3What connections exist between Keissar and other Mersad employees involved in the conspiracy?
Sina Keissar is wanted for his alleged role in a conspiracy to conduct distributed denial of service (DDoS) attacks against U.S. financial institutions and companies between 2011 and 2013 while employed by Mersad, an Iranian computer security firm. Keissar allegedly procured U.S.-based servers, tested botnets, and issued commands for attacks that targeted the financial sector. He was indicted on January 21, 2016, in the Southern District of New York and is believed to be residing in Iran, making his apprehension and prosecution a significant cybercrime objective.
Case
#624
United States District Court, Southern District of New York; Federal Bureau of Investigation
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More leads to consider
Beyond the top three above — each detail below could be the thread that pulls this case open.
📍
location
Lead #4Where in Iran is Keissar believed to be hiding and does he maintain any international communications?
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Official wording
Source Narrative
Conspiracy to Commit, and Aid and Abet, Computer Intrusion Caution: Sina Keissar is wanted for his alleged involvement in a conspiracy to conduct a coordinated campaign of distributed denial of service ("DDoS") attacks against the United States financial sector and other United States companies from 2011 through 2013. Keissar was an employee of Mersad, a private computer security company based in the Islamic Republic of Iran which allegedly performed computer attack projects on behalf of the Islamic Revolutionary Guard Corps (IRGC).
He allegedly procured United States-based computer servers used by Mersad to access and manipulate the Mersad botnet used in the financial industry DDoS attacks. Keissar also allegedly performed preliminary testing of the same botnet prior to its use in the DDoS attacks, and accessed and issued commands to the botnet.
On January 21, 2016, a grand jury in the United States District Court, Southern District of New York, indicted Keissar for his involvement in the scheme and a federal warrant was issued for his arrest after he was charged with conspiracy to commit, and aid and abet, computer intrusion. Remarks: Keissar is known to speak Farsi and is thought to be living in Iran.
Timeline of Events
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2011-01-01
DDoS Campaign Begins
Coordinated campaign of distributed denial of service attacks against U.S. financial sector initiated
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2013-12-31
DDoS Campaign Concludes
Campaign of DDoS attacks against U.S. companies ends
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2016-01-21
Federal Indictment Issued
Grand jury in U.S. District Court, Southern District of New York indicted Keissar for conspiracy to commit and aid and abet computer intrusion; federal warrant issued for arrest
Key Locations
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Case Information
Incident:January 1, 2011
Last Updated:June 15, 2026
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Case Information
Incident:January 1, 2011
Last Updated:June 15, 2026