WellMess
WellMess is lightweight malware family with variants written in .NET and Golang that has been in use since at least 2018 by APT29.[1][2][3]
Techniques Used
| Domain | ID | Name | Use | |
|---|---|---|---|---|
| Enterprise | T1071 | .004 | Application Layer Protocol: DNS |
WellMess has the ability to use DNS tunneling for C2 communications.[2][3] |
| .001 | Application Layer Protocol: Web Protocols |
WellMess can use HTTP and HTTPS in C2 communications.[2][4][1][3] |
||
| Enterprise | T1059 | .003 | Command and Scripting Interpreter: Windows Command Shell |
WellMess can execute command line scripts received from C2.[2] |
| .001 | Command and Scripting Interpreter: PowerShell |
WellMess can execute PowerShell scripts received from C2.[2][1] |
||
| Enterprise | T1132 | .001 | Data Encoding: Standard Encoding |
WellMess has used Base64 encoding to uniquely identify communication to and from the C2.[1] |
| Enterprise | T1005 | Data from Local System |
WellMess can send files from the victim machine to C2.[2][1] |
|
| Enterprise | T1001 | .001 | Data Obfuscation: Junk Data |
WellMess can use junk data in the Base64 string for additional obfuscation.[1] |
| Enterprise | T1140 | Deobfuscate/Decode Files or Information |
WellMess can decode and decrypt data received from C2.[2][4][1] |
|
| Enterprise | T1573 | .001 | Encrypted Channel: Symmetric Cryptography |
WellMess can encrypt HTTP POST data using RC6 and a dynamically generated AES key encrypted with a hard coded RSA public key.[2][4][1] |
| .002 | Encrypted Channel: Asymmetric Cryptography |
WellMess can communicate to C2 with mutual TLS where client and server mutually check certificates.[2][4][1][3] |
||
| Enterprise | T1105 | Ingress Tool Transfer | ||
| Enterprise | T1069 | .002 | Permission Groups Discovery: Domain Groups |
WellMess can identify domain group membership for the current user.[1] |
| Enterprise | T1082 | System Information Discovery |
WellMess can identify the computer name of a compromised host.[2][1] |
|
| Enterprise | T1016 | System Network Configuration Discovery |
WellMess can identify the IP address and user domain on the target machine.[2][1] |
|
| Enterprise | T1033 | System Owner/User Discovery |
WellMess can collect the username on the victim machine to send to C2.[1] |
|
Groups That Use This Software
| ID | Name | References |
|---|---|---|
| G0016 | APT29 |