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 #1Where is Sina Keissar currently located in Iran and what is his status with Iranian authorities?
🔍
evidence
Lead #2What specific U.S. financial institutions were targeted and what was the total financial impact of the DDoS attacks?
👤
person
Lead #3What other Mersad employees were involved in the conspiracy and have they been identified or apprehended?
Sina Keissar is wanted by the FBI for his alleged role in coordinating distributed denial of service (DDoS) attacks against U.S. financial institutions and companies between 2011 and 2013 while working for Mersad, an Iranian computer security firm. He allegedly procured U.S.-based servers, tested botnets, and issued commands for attacks that targeted critical American infrastructure. Keissar was indicted in January 2016 and is believed to be in Iran; locating him requires international cooperation and intelligence regarding his current whereabouts.
Case
#624
Iran
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.
💡
clue
Lead #4Which U.S.-based computer servers did Keissar procure and are they still operational or traceable?
Have information about any of these leads?
Even the smallest detail could be the key to solving this case.
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
📋
2011-01-01
DDoS Campaign Begins
Coordinated distributed denial of service attacks against U.S. financial sector and companies commence
📋
2013-12-31
DDoS Campaign Ends
Campaign of DDoS attacks against U.S. targets concludes
🕵️
2016-01-21
Indictment Issued
Grand jury in U.S. District Court, Southern District of New York, indicts Sina Keissar for conspiracy to commit and aid and abet computer intrusion; federal warrant issued for arrest
Case Information
Incident:January 1, 2011
Last Updated:October 29, 2026
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Case Information
Incident:January 1, 2011
Last Updated:October 29, 2026