ETDA สำนักงานพัฒนาธุรกรรมทางอิเล็กทรอนิกส์
Electronic Transactions Development Agency
Home > List all groups > List all tools > List all groups using tool SeDLL

Threat Group Cards: A Threat Actor Encyclopedia

Permanent link Tool: SeDLL

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.

Last change to this tool card: 24 April 2021

Download this tool card in JSON format

All groups using tool SeDLL


APT groups

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

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

Digital Service Security Center
Electronic Transactions Development Agency

Follow us on

Facebook Twitter

Report incidents

Telephone +66 (0)2-123-1227
E-mail [email protected]