General

  • Target
    Debug.zip
  • Size 2.3MB
  • Sample261104-h9em2sty4p
  • SHA256 6d4fc3b72e53bc2673b42bf28240835bb32b8876fcbe1607bd8a56f7bda811dd
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Extracted

Family
  • umbral

Version
  • v1.3

C2
  • https://discord.com/api/webhooks/1542436032425885706/O8RuUpRvQXRWJ4M6P93OpbjS_pYTemPlOMlK5iUzI5DOhCit3QIyz5d1Q6m2b2-rvyKj

Extracted

Family
  • neptunerat

Attributes
  • filename

    MasonUSB.exe

  • group

    MasonGroup

  • key

    b67QfGdzQcKREXAM

  • localhost

    127.0.0.1:1417

  • rat_name

    MasonRAT

Targets

    • Target
      Debug/EAX Console.exe
    • Size 2.0MB
    • SHA256 67f4ee97a3b3cc90ebc82b2f9fe49f84c8c1099c81061ddc8d30bc3b6cd1e587
    • MD5 SHA1 SHA512 SSDEEP TLSH
    • Detects NeptuneRAT stealer

    • Detects Umbral payload

    • Family: NeptuneRAT, MasonRAT

      NeptuneRAT aka MasonRAT is a trojan written in C#.

    • Family: Umbral

      Umbral stealer is an open-source modular stealer written in C#.

    • Suspicious use of NtCreateUserProcessOtherParentProcess

    • Checks computer location settings

      Looks up country code configured in the registry, likely geofence.

    • Executes dropped EXE

    • Loads dropped DLL

    • Reads user/profile data of web browsers

      Infostealers often target stored browser data, which can include saved credentials etc.

    • Uses the VBS compiler for execution

    • Drops file in System32 directory

    • Suspicious use of SetThreadContext

    • Target
      Debug/Guna.UI2.dll
    • Size 2.1MB
    • SHA256 6d876b257a97995d21072acd44580633468516121145cc218277edc18f971030
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    1/10
    • Target
      Debug/Melanchall.DryWetMidi.dll
    • Size 778KB
    • SHA256 ad4ac36ecd26a0dd9c79ed0fadd6a9a18fcbdef0032af22f083e9430e1c84e87
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    1/10
    • Target
      Debug/Melanchall_DryWetMidi_Native32.dll
    • Size 56KB
    • SHA256 080346c638e219ec7cd4748e370e5e11931ed3a228c17f76d84c4d10ba9c9e6f
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    3/10
    • Target
      Debug/Melanchall_DryWetMidi_Native64.dll
    • Size 65KB
    • SHA256 80ca89af931e43642a125ec82e253d9bd7002088d000daba6e0661cdad89f5aa
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    1/10
    • Target
      Debug/Melanchall_DryWetMidi_Native64.dylib
    • Size 88KB
    • SHA256 aa08c542e77b045fa1e00d4feab21080ceb415c4b6c343b0dbc5704d1fb02f92
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    1/10
    • Target
      Debug/VoicemeeterRemote.dll
    • Size 162KB
    • SHA256 11270aad74acc080b1b55d568e7656961392da55323846ca5f12a9c765517d47
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    3/10
    • Target
      Debug/VoicemeeterRemote64.dll
    • Size 192KB
    • SHA256 69a24e80c96d2d557c6a0ce46cc0add1f62e252c613bccfa7f27833ca5345d87
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    1/10

MITRE ATT&CK Enterprise v16

Tasks