Overview

overview

7

Static

static

1

Merostomatous.exe

windows7-x64

7

Merostomatous.exe

windows10-2004-x64

7

Analysis

  • max time kernel
    147s
  • max time network
    146s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-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 1 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 34 IoCs
  • Suspicious behavior: MapViewOfSection 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 4 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:3772
    • 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 behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:2276

Network

        MITRE ATT&CK Enterprise v6

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        Downloads

        System.dll
        • Path C:\Users\Admin\AppData\Local\Temp\nsn840A.tmp\System.dll
        • Size 11KB
        • SHA256 7fe77ca13121a113c59630a3dba0c8aaa6372e8082393274da8f8608c4ce4528
        • MD5 SHA1 SHA512 SSDEEP
        Submit Download

        memory/2276-151-0x0000000000400000-0x0000000001654000-memory.dmp
        Download

        memory/2276-152-0x0000000000400000-0x0000000001654000-memory.dmp
        Download

        memory/2276-165-0x0000000000400000-0x0000000001654000-memory.dmp
        Download

        memory/2276-166-0x0000000001660000-0x0000000005684000-memory.dmp
        Download

        memory/2276-167-0x0000000035C40000-0x0000000035F8A000-memory.dmp
        Download

        memory/2276-168-0x0000000000400000-0x0000000001654000-memory.dmp
        Download