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: The use of a password-protected ZIP (with the password 12345 ) is a known method for delivering "Copy-Paste Compromises," where the user manually executes the threat after the archive bypasses initial network defenses. mimounidllx64v5200password12345zip hot

| Step | Action | Observations | |------|--------|--------------| | 1 | rundll32.exe payload.dll,Initialize launched by a PowerShell script. | The DLL is loaded via LoadLibraryW . | | 2 | Initialize reads config.json (base64‑decoded) to retrieve two C2 URLs and an AES‑256 key. | The URLs are: https://a1b2c3d4.ngrok.io/recv and https://x9y8z7.wormhole.io/ping . | | 3 | The DLL spawns a that calls CreateProcessW to launch powershell.exe -NoProfile -WindowStyle Hidden -EncodedCommand … . | The PowerShell command downloads a secondary payload ( stage2.bin ) via HTTPS, decrypts it using the AES key, and writes it to %TEMP%\GUID.tmp . | | 4 | stage2.bin is a file‑less shellcode injected into the svchost.exe process using VirtualAllocEx + WriteProcessMemory + CreateRemoteThread . | The shellcode establishes a C2 over TLS (mutual authentication) and begins a credential‑harvesting routine targeting browsers and Outlook. | | 5 | Registry modifications: HKCU\Software\Microsoft\Windows\CurrentVersion\Run\Updater → C:\Windows\system32\svchost.exe -k netsvcs . | Persistence via Run key. | | 6 | The DLL deletes the extracted files ( payload.dll , config.json , readme.txt ) from the temporary directory. | Anti‑forensic cleanup. | | 7 | Network: Two outbound TLS connections (SNI: a1b2c3d4.ngrok.io , x9y8z7.wormhole.io ). Both use TLS 1.3 with self‑signed certificates. No obvious beaconing pattern (encrypted payload). | C2 traffic is disguised as legitimate HTTPS. | : A great essay helps the reader understand

| Attribute | Observation | |-----------|-------------| | | “mimounid” appears in a handful of samples posted on underground forums in 2024‑2025, linked to APT‑Cobalt (a financially motivated group that targets corporate credentials). | | Code reuse | The DLL imports crypt32.dll for DPAPI decryption, a technique also used by the Emotet loader in 2023. | | Infrastructure | Use of ngrok tunnels for short‑lived C2 is consistent with FIN7 and DarkSide post‑2024 operational changes. | | Payload | The credential‑stealing module matches the “ CredentialGrabber v5 ” module sold on the Malware-as-a-Service (MaaS) marketplace “ ShadowBot ”. | | The DLL is loaded via LoadLibraryW

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