Analysis

  • max time kernel
    149s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-en-20220112
  • submitted
    16/02/2022, 03:03

General

  • Target
    Bakuras.exe
  • Size 295KB
  • Sample220216-dj2bxabca5
  • SHA256 9ceceb144ec9613aaef8b7e653711623f17e6e983abd50f5c47fda97f87e9549
  • MD5 SHA1 SHA512

Malware Config

Extracted

Family
  • formbook

Version
  • 4.1

Campaign
  • b1s5

Decoy
  • stockdistance100.com

  • bit-latino.com

  • paradimetempest.com

  • budgetmdfdoors.com

  • huacadao.com

  • rezcoat.online

  • p1122.com

  • tongtaigj.com

  • gashouseweeds.com

  • statewide-inspections.com

  • fan1234.com

  • shishang.show

  • metaplumbers.xyz

  • yaojiaoks.com

  • sowiesoverzekerd.site

  • navifoil.com

  • goodlandfabrics.com

  • leongeo.com

  • happy-planet.space

  • inproinfra.com

Signatures

  • Formbook

    Formbook is a data stealing malware which is capable of stealing data.

  • Formbook Payload 2 IoCs
  • Executes dropped EXE 2 IoCs
  • Suspicious use of SetThreadContext 3 IoCs
  • Drops file in Windows directory 3 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Checks processor information in registry 2 TTPs 2 IoCs

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

  • Modifies data under HKEY_USERS 52 IoCs
  • Suspicious behavior: EnumeratesProcesses 60 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious behavior: MapViewOfSection 5 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 15 IoCs

Processes

  • C:\Windows\Explorer.EXE
    C:\Windows\Explorer.EXE
    1⤵
    • Suspicious behavior: GetForegroundWindowSpam
    • Suspicious use of WriteProcessMemory
    PID:2460
    • C:\Users\Admin\AppData\Local\Temp\Bakuras.exe
      "C:\Users\Admin\AppData\Local\Temp\Bakuras.exe"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3976
      • C:\Users\Admin\AppData\Local\Temp\lmdbldip.exe
        C:\Users\Admin\AppData\Local\Temp\lmdbldip.exe C:\Users\Admin\AppData\Local\Temp\vsoyu
        3⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2888
        • C:\Users\Admin\AppData\Local\Temp\lmdbldip.exe
          C:\Users\Admin\AppData\Local\Temp\lmdbldip.exe C:\Users\Admin\AppData\Local\Temp\vsoyu
          4⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious behavior: MapViewOfSection
          • Suspicious use of AdjustPrivilegeToken
          PID:1448
    • C:\Windows\SysWOW64\autoconv.exe
      "C:\Windows\SysWOW64\autoconv.exe"
      2⤵
        PID:1244
      • C:\Windows\SysWOW64\colorcpl.exe
        "C:\Windows\SysWOW64\colorcpl.exe"
        2⤵
        • Suspicious use of SetThreadContext
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious behavior: MapViewOfSection
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1980
        • C:\Windows\SysWOW64\cmd.exe
          /c del "C:\Users\Admin\AppData\Local\Temp\lmdbldip.exe"
          3⤵
            PID:460
      • C:\Windows\System32\svchost.exe
        C:\Windows\System32\svchost.exe -k NetworkService -p
        1⤵
        • Drops file in Windows directory
        • Modifies data under HKEY_USERS
        PID:1308
      • C:\Windows\system32\MusNotifyIcon.exe
        %systemroot%\system32\MusNotifyIcon.exe NotifyTrayIcon 13
        1⤵
        • Checks processor information in registry
        PID:3016
      • C:\Windows\winsxs\amd64_microsoft-windows-servicingstack_31bf3856ad364e35_10.0.19041.1220_none_7e21bc567c7ed16b\TiWorker.exe
        C:\Windows\winsxs\amd64_microsoft-windows-servicingstack_31bf3856ad364e35_10.0.19041.1220_none_7e21bc567c7ed16b\TiWorker.exe -Embedding
        1⤵
        • Drops file in Windows directory
        • Suspicious use of AdjustPrivilegeToken
        PID:3040

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            memory/1448-137-0x0000000001AE0000-0x0000000001E2A000-memory.dmp

            memory/1448-134-0x0000000000400000-0x000000000042F000-memory.dmp

            memory/1448-138-0x000000000041F000-0x0000000000420000-memory.dmp

            memory/1448-139-0x00000000019E0000-0x00000000019F5000-memory.dmp

            memory/1980-141-0x0000000000B90000-0x0000000000BA9000-memory.dmp

            memory/1980-142-0x0000000002F00000-0x0000000002F2F000-memory.dmp

            memory/1980-143-0x0000000004EA0000-0x00000000051EA000-memory.dmp

            memory/1980-144-0x0000000004CE0000-0x0000000004D74000-memory.dmp

            memory/2460-140-0x00000000030E0000-0x00000000031D7000-memory.dmp

            memory/2460-145-0x00000000084C0000-0x00000000085AE000-memory.dmp