Overview

overview

7

Static

static

1

Merostomatous.exe

windows7-x64

7

Merostomatous.exe

windows10-2004-x64

7

Analysis

  • max time kernel
    146s
  • max time network
    130s
  • platform
    windows7_x64
  • resource
    win7-20230220-en
  • resource tags

    arch:x64arch:x86image:win7-20230220-enlocale:en-usos:windows7-x64system
  • submitted
    21/04/2023, 12:44

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General

  • Target
    Merostomatous.exe
  • Size 1.2MB
  • Sample230421-pygrlafe76
  • SHA256 bf08a37ece16dd2e5f8484b49437bb1d84ec62f8dd64b791cdcb6af1ff691568
  • MD5 SHA1 SHA512 SSDEEP
Score
7/10

Malware Config

Signatures

  • Checks QEMU agent file 2 TTPs 2 IoCs

    Checks presence of QEMU agent, possibly to detect virtualization.

  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Loads dropped DLL 1 IoCs
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs
  • Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs
  • Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs
  • Suspicious use of SetThreadContext 2 IoCs
  • Drops file in Windows directory 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Suspicious behavior: EnumeratesProcesses 18 IoCs
  • Suspicious behavior: MapViewOfSection 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 9 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Merostomatous.exe
    "C:\Users\Admin\AppData\Local\Temp\Merostomatous.exe"
    1⤵
    • Checks QEMU agent file
    • Loads dropped DLL
    • Suspicious use of NtSetInformationThreadHideFromDebugger
    • Suspicious use of SetThreadContext
    • Drops file in Windows directory
    • Suspicious behavior: MapViewOfSection
    • Suspicious use of WriteProcessMemory
    PID:624
    • C:\Users\Admin\AppData\Local\Temp\Merostomatous.exe
      "C:\Users\Admin\AppData\Local\Temp\Merostomatous.exe"
      2⤵
      • Checks QEMU agent file
      • Checks computer location settings
      • Suspicious use of NtCreateThreadExHideFromDebugger
      • Suspicious use of NtSetInformationThreadHideFromDebugger
      • Suspicious use of SetThreadContext
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious behavior: MapViewOfSection
      • Suspicious use of AdjustPrivilegeToken
      PID:772
    • C:\Windows\SysWOW64\mstsc.exe
      "C:\Windows\SysWOW64\mstsc.exe"
      2⤵
        PID:1000

    Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          System.dll
          • Path \Users\Admin\AppData\Local\Temp\nsy1151.tmp\System.dll
          • Size 11KB
          • SHA256 7fe77ca13121a113c59630a3dba0c8aaa6372e8082393274da8f8608c4ce4528
          • MD5 SHA1 SHA512 SSDEEP
          Submit Download

          memory/624-100-0x0000000001D20000-0x0000000001E06000-memory.dmp
          Download

          memory/772-72-0x0000000000400000-0x0000000001462000-memory.dmp
          Download

          memory/772-73-0x0000000000400000-0x0000000001462000-memory.dmp
          Download

          memory/772-74-0x0000000000400000-0x0000000001462000-memory.dmp
          Download

          memory/772-97-0x0000000000400000-0x0000000001462000-memory.dmp
          Download

          memory/772-98-0x0000000001470000-0x0000000005494000-memory.dmp
          Download

          memory/772-99-0x0000000035990000-0x0000000035C93000-memory.dmp
          Download

          memory/772-101-0x0000000000400000-0x0000000001462000-memory.dmp
          Download