Analysis

  • max time kernel
    141s
  • max time network
    129s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240611-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240611-enlocale:en-usos:windows10-2004-x64system
  • submitted
    15-06-2024 06:58

General

  • Target

    1.3.1.1002/LemonCalendar.exe

  • Size

    968KB

  • MD5

    6316d6cbb865715433fabb26ef40475c

  • SHA1

    26fe47aa5a8cba00724437f48ff2a945f6438388

  • SHA256

    e85fcae499aa5adb7655fb969faeeddfd29d533848c2bb024d3cd5cbdabb1800

  • SHA512

    8c199d0b84272a5604884895dbf48fe48ca3000d7a6010a51d1e65ad4f708e733077453c61ea11dc2cf16ea1f552feb86468d1ff3cc5feea1aae75084fd93587

  • SSDEEP

    12288:8GMJPzFmrIyaAn+FJqbtMGapym5mWaaj6jIRnA3CKvFmdY8/riVjcP55CI7kqhpf:8Tx3Ak6KUm5gSRorX4bCI7kG4J7Y

Score
7/10

Malware Config

Signatures

  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Adds Run key to start application 2 TTPs 1 IoCs
  • Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs

    Bootkits write to the MBR to gain persistence at a level below the operating system.

  • Enumerates physical storage devices 1 TTPs

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

  • Suspicious use of FindShellTrayWindow 8 IoCs
  • Suspicious use of SendNotifyMessage 2 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 2 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\1.3.1.1002\LemonCalendar.exe
    "C:\Users\Admin\AppData\Local\Temp\1.3.1.1002\LemonCalendar.exe"
    1⤵
    • Checks computer location settings
    • Adds Run key to start application
    • Writes to the Master Boot Record (MBR)
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of SendNotifyMessage
    • Suspicious use of WriteProcessMemory
    PID:3588
    • C:\Users\Admin\AppData\Local\Temp\1.3.1.1002\RunningHelper64.exe
      "C:\Users\Admin\AppData\Local\Temp\1.3.1.1002\RunningHelper64.exe" /dll_launch=Install_Force
      2⤵
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SetWindowsHookEx
      PID:2044
  • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
    "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --field-trial-handle=4156,i,16866810346450717340,3849854439116899380,262144 --variations-seed-version --mojo-platform-channel-handle=4356 /prefetch:8
    1⤵
      PID:1364

    Network

    MITRE ATT&CK Matrix ATT&CK v13

    Persistence

    Boot or Logon Autostart Execution

    1
    T1547

    Registry Run Keys / Startup Folder

    1
    T1547.001

    Pre-OS Boot

    1
    T1542

    Bootkit

    1
    T1542.003

    Privilege Escalation

    Boot or Logon Autostart Execution

    1
    T1547

    Registry Run Keys / Startup Folder

    1
    T1547.001

    Defense Evasion

    Modify Registry

    1
    T1112

    Pre-OS Boot

    1
    T1542

    Bootkit

    1
    T1542.003

    Discovery

    Query Registry

    1
    T1012

    System Information Discovery

    2
    T1082

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • memory/2044-0-0x000001649B0D0000-0x000001649B183000-memory.dmp
      Filesize

      716KB