Windows Analysis Report
G1kkgNRuTw.dll

# Malware Analysis Summary

## Overview
The sample is a .NET-based loader (loaddll64.exe) that executes a malicious DLL (G1kkgNRuTw.dll) through multiple execution methods and injects CobaltStrike payload into Internet Explorer processes.

## Execution Flow

**Initial Access:**
- loaddll64.exe (PID 9160) is launched as the entry point and serves as the primary orchestrator.

**Payload Staging:**
The malware loads the DLL (G1kkgNRuTw.dll) via multiple execution vectors:
1. rundll32.exe with CPlApplet export (PID 8996)
2. rundll32.exe with DllRegisterServer export (PID 5548)
3. rundll32.exe with DllUnregisterServer export (PID 4588)
4. cmd.exe  rundll32.exe with ordinal #1 export (PID 9208  9008)
5. regsvr32.exe with silent flag (PID 6488)
6. Direct iexplore.exe launch (PID 9180)

This multi-method approach suggests an attempt to maximize execution reliability and evade detection through varied execution patterns.

## Malicious Behavior

**Code Injection:**
- The DLL contains process injection code (identified in Runner.cs) that uses VirtualAllocEx, WriteProcessMemory, and VirtualProtectEx APIs.
- Multiple rundll32.exe and regsvr32.exe instances inject code into Internet Explorer processes (PIDs 8848, 276, 3384, 5536, 9180) at various memory addresses.
- Thread injection is performed into iexplore.exe with execution instruction pointers at 0x17B0000, 0x93060000, and 0x44380000.

**Payload Delivery:**
- CobaltStrike beacon detected in memory of iexplore.exe (PID 3384) and associated memory dumps.
- The injected payload is identified as CobaltStrike through Yara signatures and community detection rules.

## Process Relationships
- loaddll64.exe spawns all child processes
- rundll32.exe and regsvr32.exe instances execute the malicious DLL
- cmd.exe is used as an intermediary to invoke rundll32.exe
- conhost.exe is spawned (likely for console output during execution)
- WerFault.exe is triggered by rundll32.exe (PID 8996), possibly as a side effect of DLL execution

## MITRE ATT&CK Techniques

- **T1055.001**  Process Injection: DLL Injection (injection into iexplore.exe via VirtualAllocEx/WriteProcessMemory)
- **T1218.009**  System Binary Proxy Execution: Regsvr32 (regsvr32.exe used to load malicious DLL)
- **T1218.011**  System Binary Proxy Execution: Rundll32 (rundll32.exe used with multiple DLL exports)
- **T1059.003**  Command and Scripting Interpreter: Windows Command Shell (cmd.exe used to invoke rundll32.exe)
- **T1105**  Ingress Tool Transfer (CobaltStrike beacon delivery and execution)