More_eggs
More_eggs is a JScript backdoor used by Cobalt Group and FIN6. Its name was given based on the variable "More_eggs" being present in its code. There are at least two different versions of the backdoor being used, version 2.0 and version 4.4. [1][2]
Associated Software Descriptions
| Name | Description |
|---|---|
| SKID | |
| Terra Loader | |
| SpicyOmelette |
Techniques Used
| Domain | ID | Name | Use | |
|---|---|---|---|---|
| Enterprise | T1071 | .001 | Application Layer Protocol: Web Protocols | |
| Enterprise | T1059 | .003 | Command and Scripting Interpreter: Windows Command Shell | |
| Enterprise | T1132 | .001 | Data Encoding: Standard Encoding |
More_eggs has used basE91 encoding, along with encryption, for C2 communication.[2] |
| Enterprise | T1140 | Deobfuscate/Decode Files or Information |
More_eggs will decode malware components that are then dropped to the system.[2] |
|
| Enterprise | T1573 | .001 | Encrypted Channel: Symmetric Cryptography |
More_eggs has used an RC4-based encryption method for its C2 communications.[2] |
| Enterprise | T1070 | .004 | Indicator Removal on Host: File Deletion | |
| Enterprise | T1105 | Ingress Tool Transfer |
More_eggs can download and launch additional payloads.[1][2] |
|
| Enterprise | T1027 | Obfuscated Files or Information |
More_eggs's payload has been encrypted with a key that has the hostname and processor family information appended to the end.[5] |
|
| Enterprise | T1518 | .001 | Software Discovery: Security Software Discovery |
More_eggs can obtain information on installed anti-malware programs.[1] |
| Enterprise | T1553 | .002 | Subvert Trust Controls: Code Signing |
More_eggs has used a signed binary shellcode loader and a signed Dynamic Link Library (DLL) to create a reverse shell.[2] |
| Enterprise | T1218 | .010 | System Binary Proxy Execution: Regsvr32 |
More_eggs has used regsvr32.exe to execute the malicious DLL.[2] |
| Enterprise | T1082 | System Information Discovery |
More_eggs has the capability to gather the OS version and computer name.[1][2] |
|
| Enterprise | T1016 | System Network Configuration Discovery |
More_eggs has the capability to gather the IP address from the victim's machine.[1] |
|
| .001 | Internet Connection Discovery |
More_eggs has used HTTP GET requests to check internet connectivity.[2] |
||
| Enterprise | T1033 | System Owner/User Discovery |
More_eggs has the capability to gather the username from the victim's machine.[1][2] |
|
Groups That Use This Software
| ID | Name | References |
|---|---|---|
| G0120 | Evilnum | |
| G0080 | Cobalt Group | |
| G0037 | FIN6 |