Analysis

  • max time kernel
    93s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    28/02/2024, 11:57

General

  • Target
    abd3541e61a13ebab33906793d93e1c6.exe
  • Size 1.7MB
  • Sample240228-n4qe9aba45
  • SHA256 488ea10db6631490747d75fa0f2230ba06e1abbff091fc23a72cc365caeedf91
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • mercurialgrabber

C2
  • https://discord.com/api/webhooks/877844271204536361/2xC1dXN4WejNm9qJB3-QdC-SB8wvkAIDX_HqiaFmSU4EWdp95OLmJ0nZemeDXsBlbQ-h

Signatures

  • Mercurial Grabber Stealer

    Mercurial Grabber is an open source stealer targeting Chrome, Discord and some game clients as well as generic system information.

  • Looks for VirtualBox Guest Additions in registry 2 TTPs 1 IoCs
  • Looks for VMWare Tools registry key 2 TTPs 1 IoCs
  • Checks BIOS information in registry 2 TTPs 1 IoCs

    BIOS information is often read in order to detect sandboxing environments.

  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Executes dropped EXE 2 IoCs
  • Reads user/profile data of web browsers 2 TTPs

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

  • Adds Run key to start application 2 TTPs 1 IoCs
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs 3 IoCs
  • Looks up external IP address via web service 3 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Maps connected drives based on registry 3 TTPs 2 IoCs

    Disk information is often read in order to detect sandboxing environments.

  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Program crash 1 IoCs
  • Checks SCSI registry key(s) 3 TTPs 1 IoCs

    SCSI information is often read in order to detect sandboxing environments.

  • Checks processor information in registry 2 TTPs 2 IoCs

    Processor information is often read in order to detect sandboxing environments.

  • Enumerates system info in registry 2 TTPs 4 IoCs
  • Modifies system certificate store 2 TTPs 5 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 9 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\abd3541e61a13ebab33906793d93e1c6.exe
    "C:\Users\Admin\AppData\Local\Temp\abd3541e61a13ebab33906793d93e1c6.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2728
    • C:\Users\Admin\AppData\Local\Temp\Windows Explorer.exe
      "C:\Users\Admin\AppData\Local\Temp\Windows Explorer.exe"
      2⤵
      • Looks for VirtualBox Guest Additions in registry
      • Looks for VMWare Tools registry key
      • Checks BIOS information in registry
      • Executes dropped EXE
      • Adds Run key to start application
      • Maps connected drives based on registry
      • Checks SCSI registry key(s)
      • Checks processor information in registry
      • Enumerates system info in registry
      • Modifies system certificate store
      • Suspicious use of AdjustPrivilegeToken
      PID:4284
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 4284 -s 2512
        3⤵
        • Program crash
        PID:2352
    • C:\Users\Admin\AppData\Local\Temp\FREELOUDER.exe
      "C:\Users\Admin\AppData\Local\Temp\FREELOUDER.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of WriteProcessMemory
      PID:4456
      • C:\Windows\system32\cmd.exe
        C:\Windows\system32\cmd.exe /c cls
        3⤵
          PID:2496
        • C:\Windows\system32\cmd.exe
          C:\Windows\system32\cmd.exe /c cls
          3⤵
            PID:776
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 464 -p 4284 -ip 4284
        1⤵
          PID:1396

        Network

              MITRE ATT&CK Enterprise v15

              Replay Monitor

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              Downloads

              FREELOUDER.exe

              • Path C:\Users\Admin\AppData\Local\Temp\FREELOUDER.exe
              • Size 25KB
              • SHA256 9a14cf634ea2edab64318e80a6886332ad4146aa95117f14044f336070b2367d
              • MD5 SHA1 SHA512 SSDEEP

              Windows Explorer.exe

              • Path C:\Users\Admin\AppData\Local\Temp\Windows Explorer.exe
              • Size 4.1MB
              • SHA256 4f47eec655324ba45416ad929915c814eaa93a0021dc81e322615e7623ea1121
              • MD5 SHA1 SHA512 SSDEEP

              memory/4284-20-0x0000000073990000-0x0000000074140000-memory.dmp

              memory/4284-19-0x00000000001E0000-0x00000000005FC000-memory.dmp

              memory/4284-21-0x0000000004FD0000-0x000000000506C000-memory.dmp

              memory/4284-22-0x0000000005620000-0x0000000005BC4000-memory.dmp

              memory/4284-24-0x0000000005070000-0x000000000508C000-memory.dmp

              memory/4284-25-0x00000000050B0000-0x00000000050C0000-memory.dmp

              memory/4284-26-0x0000000006A30000-0x0000000006A96000-memory.dmp

              memory/4284-30-0x0000000073990000-0x0000000074140000-memory.dmp