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Threat Group Cards: A Threat Actor Encyclopedia

Permanent link Tool: SeDLL

NamesSeDLL
CategoryMalware
TypeLoader
Description(Proofpoint) This DLL is used for decrypting and executing another JavaScript backdoor such as AIRBREAK. The DLL is registered by the installer using regsvr32. The DllRegisterServer export is then called, which performs checks on the commandline parameter. If the string “DR” is passed as an argument, or if the DLL is running in the active session with a username that is not “system”, the final JavaScript backdoor is decoded using a custom base64 alphabet. This backdoor has to be present in the same directory as the dll, with a “.tmp” file extension. The backdoor script is then executed using the IActiveScript and IActiveScriptParse32 COM interfaces.
Information<https://www.proofpoint.com/us/threat-insight/post/leviathan-espionage-actor-spearphishes-maritime-and-defense-targets>
<https://www.fireeye.com/blog/threat-research/2018/03/suspected-chinese-espionage-group-targeting-maritime-and-engineering-industries.html>
<https://www.recordedfuture.com/chinese-threat-actor-tempperiscope/>
Malpedia<https://malpedia.caad.fkie.fraunhofer.de/details/win.sedll>

Last change to this tool card: 24 April 2021

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All groups using tool SeDLL

ChangedNameCountryObserved

APT groups

 Leviathan, APT 40, TEMP.PeriscopeChina2013-Jul 2021 HOTX

1 group listed (1 APT, 0 other, 0 unknown)

Thailand Computer Emergency Response Team (ThaiCERT)
Electronic Transactions Development Agency

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