Cyber Resilience

Threat actor · all actors

Silent LibrarianG0122 state

🇮🇷 IR

aka Silent Librarian, TA407, COBALT DICKENS, Mabna Institute, TA4900, Yellow Nabu, Mabna Institute Group

Last updated: 2026-08-20

0attributed CVEs
20ATT&CK techniques
0.0IDF score (tooling uniqueness)
0exclusive CVEs
—years active

About this actor

Last Friday, Deputy Attorney General Rod Rosenstein announced the indictment of nine Iranians who worked for an organization named the Mabna Institute. According to prosecutors, the defendants stole more than 31 terabytes of data from universities, companies, and government agencies around the world. The cost to the universities alone reportedly amounted to approximately $3.4 billion. The information stolen from these universities was used by the Islamic Revolutionary Guard Corps (IRGC) or sold for profit inside Iran. PhishLabs has been tracking this same threat group since late-2017, designating them Silent Librarian. Since discovery, we have been working with the FBI, ISAC partners, and other international law enforcement agencies to help understand and mitigate these attacks.

Source: MITRE ATT&CK

Names & naming systems

Each vendor coins its own name for the same actor. Where a name follows a known scheme we attribute it; the rest are listed honestly as unclassified.

MITRE ATT&CKG-number catalogue id

G0122

Secureworkscolour-metal names

COBALT DICKENS

ProofpointTA threat-actor id

TA407TA4900

Unclassifiedno scheme matched

Silent LibrarianMabna InstituteYellow NabuMabna Institute Group

How we know this

Data origin
MITRE ATT&CK Imported from the MITRE ATT&CK STIX bundle as an intrusion-set object.
Techniques
MITRE ATT&CK STIX mappings — 20 ATT&CK techniques on file.
Named victims
None on file.

See how actor data is built for the full pipeline.

Activity timeline

No activity events recorded.

Profile

CVERiskCVSSEPSSPublishedProducts
No attributed CVEs.

Mitigating controls (NIST 800-53)

ControlTechniques coveredCoverage
CM-67 / 2035%
SI-47 / 2035%
CA-75 / 2025%
CM-25 / 2025%
SC-75 / 2025%
AC-204 / 2020%
AC-34 / 2020%
AC-44 / 2020%
IA-24 / 2020%
IA-54 / 2020%
AC-23 / 2015%
AC-53 / 2015%
AC-63 / 2015%
AC-162 / 2010%
AC-172 / 2010%

Co-occurring actors

None.

Similar actors

Similar TTPs

Same nation-state

Same category