Emissary
Emissary is a Trojan that has been used by Lotus Blossom. It shares code with Elise, with both Trojans being part of a malware group referred to as LStudio. [1]
Techniques Used
Domain | ID | Name | Use | |
---|---|---|---|---|
Enterprise | T1071 | .001 | Application Layer Protocol: Web Protocols | |
Enterprise | T1547 | .001 | Boot or Logon Autostart Execution: Registry Run Keys / Startup Folder |
Variants of Emissary have added Run Registry keys to establish persistence.[2] |
Enterprise | T1059 | .003 | Command and Scripting Interpreter: Windows Command Shell |
Emissary has the capability to create a remote shell and execute specified commands.[1] |
Enterprise | T1543 | .003 | Create or Modify System Process: Windows Service | |
Enterprise | T1573 | .001 | Encrypted Channel: Symmetric Cryptography |
The C2 server response to a beacon sent by a variant of Emissary contains a 36-character GUID value that is used as an encryption key for subsequent network communications. Some variants of Emissary use various XOR operations to encrypt C2 data.[1] |
Enterprise | T1105 | Ingress Tool Transfer |
Emissary has the capability to download files from the C2 server.[1] |
|
Enterprise | T1027 | Obfuscated Files or Information |
Variants of Emissary encrypt payloads using various XOR ciphers, as well as a custom algorithm that uses the "srand" and "rand" functions.[1][2] |
|
.001 | Binary Padding |
A variant of Emissary appends junk data to the end of its DLL file to create a large file that may exceed the maximum size that anti-virus programs can scan.[2] |
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Enterprise | T1069 | .001 | Permission Groups Discovery: Local Groups |
Emissary has the capability to execute the command |
Enterprise | T1055 | .001 | Process Injection: Dynamic-link Library Injection |
Emissary injects its DLL file into a newly spawned Internet Explorer process.[1] |
Enterprise | T1218 | .011 | Signed Binary Proxy Execution: Rundll32 |
Variants of Emissary have used rundll32.exe in Registry values added to establish persistence.[2] |
Enterprise | T1082 | System Information Discovery |
Emissary has the capability to execute ver, systeminfo, and gpresult commands.[2] |
|
Enterprise | T1016 | System Network Configuration Discovery |
Emissary has the capability to execute the command |
|
Enterprise | T1007 | System Service Discovery |
Emissary has the capability to execute the command |
Groups That Use This Software
ID | Name | References |
---|---|---|
G0030 | Lotus Blossom |