The person at the center of this case
United States financial sector and companies targeted by DDoS attacks
Cold Case · Open
10 years waiting · since 2016
SINA KEISSAR
Justice for United States financial sector and companies targeted by DDoS attacks — the trail went cold in 2016, but the truth hasn't.
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Key leads to think about
🎯
suspect
Lead #1What is Sina Keissar's current location and operational status in Iran?
🔍
evidence
Lead #2What specific U.S.-based servers did Keissar procure and how were they traced?
👤
person
Lead #3What other Mersad employees were involved in the DDoS conspiracy and have they been identified?
Sina Keissar is wanted for his role in a coordinated conspiracy to conduct distributed denial of service (DDoS) attacks against U.S. financial institutions and companies between 2011 and 2013. Working as an employee of Mersad, an Iranian computer security firm allegedly operating on behalf of the Islamic Revolutionary Guard Corps, Keissar procured U.S.-based servers, tested botnets, and issued commands for the attacks. He was indicted on January 21, 2016, in the Southern District of New York and remains at large, believed to be in Iran.
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 #4What financial institutions and companies were targeted, and what was the extent of the damage?
📞
contact
Lead #5Does Keissar maintain any communications or financial ties outside Iran that could aid in apprehension?
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 Period Begins
Coordinated distributed denial of service attacks against U.S. financial sector and companies commence
🕵️
2013-12-31
DDoS Campaign Period Ends
Coordinated distributed denial of service attacks against U.S. financial sector and companies conclude
🕵️
2016-01-21
Federal Indictment
Grand jury in U.S. District Court, Southern District of New York, indicts Keissar for conspiracy to commit and aid and abet computer intrusion; federal warrant issued for arrest
Case Information
Incident:January 1, 2011
Last Updated:April 29, 2026
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Case Information
Incident:January 1, 2011
Last Updated:April 29, 2026