Analysis

  • max time kernel
    150s
  • max time network
    159s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    26/03/2024, 17:25

General

  • Target

    dfb4e28eaefda8e7dd87cda8bc66d12c.exe

  • Size

    10.5MB

  • MD5

    dfb4e28eaefda8e7dd87cda8bc66d12c

  • SHA1

    01f793ffbddfedd0be3d9336431070985946aece

  • SHA256

    447be4372af7afa914f4cbeacbeb1e0c5a2df26e1730598f44e4ad0609399cd7

  • SHA512

    4996cc63e96be5ec785bb6df41c83898048005ceec75f701f439ebf82a744651575e86fd4c52c2c517c4c4c9e0c353eeaff0878a0db7ca4eae086444829e4454

  • SSDEEP

    24576:uj8tdiKEvdYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYw:6Kg

Malware Config

Extracted

Family

tofsee

C2

43.231.4.6

lazystax.ru

Signatures

  • Tofsee

    Backdoor/botnet which carries out malicious activities based on commands from a C2 server.

  • Creates new service(s) 1 TTPs
  • Modifies Windows Firewall 2 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Deletes itself 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Launches sc.exe 3 IoCs

    Sc.exe is a Windows utlilty to control services on the system.

  • Enumerates physical storage devices 1 TTPs

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

  • Program crash 2 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\dfb4e28eaefda8e7dd87cda8bc66d12c.exe
    "C:\Users\Admin\AppData\Local\Temp\dfb4e28eaefda8e7dd87cda8bc66d12c.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:5112
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\lljiyuec\
      2⤵
        PID:4416
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\yvnearnl.exe" C:\Windows\SysWOW64\lljiyuec\
        2⤵
          PID:4676
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create lljiyuec binPath= "C:\Windows\SysWOW64\lljiyuec\yvnearnl.exe /d\"C:\Users\Admin\AppData\Local\Temp\dfb4e28eaefda8e7dd87cda8bc66d12c.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4420
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description lljiyuec "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4744
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start lljiyuec
          2⤵
          • Launches sc.exe
          PID:4356
        • C:\Windows\SysWOW64\netsh.exe
          "C:\Windows\System32\netsh.exe" advfirewall firewall add rule name="Host-process for services of Windows" dir=in action=allow program="C:\Windows\SysWOW64\svchost.exe" enable=yes>nul
          2⤵
          • Modifies Windows Firewall
          PID:3824
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 5112 -s 1308
          2⤵
          • Program crash
          PID:3052
      • C:\Windows\SysWOW64\lljiyuec\yvnearnl.exe
        C:\Windows\SysWOW64\lljiyuec\yvnearnl.exe /d"C:\Users\Admin\AppData\Local\Temp\dfb4e28eaefda8e7dd87cda8bc66d12c.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3192
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Deletes itself
          PID:2500
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3192 -s 508
          2⤵
          • Program crash
          PID:2156
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 5112 -ip 5112
        1⤵
          PID:3620
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 360 -p 3192 -ip 3192
          1⤵
            PID:1568
          • 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 --no-appcompat-clear --mojo-platform-channel-handle=3872 --field-trial-handle=2496,i,15897292497548307209,13920214570023230813,262144 --variations-seed-version /prefetch:8
            1⤵
              PID:2600

            Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

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            Downloads

            • C:\Users\Admin\AppData\Local\Temp\yvnearnl.exe

              Filesize

              13.6MB

              MD5

              d2f577cd3b923131d7c4c47ceaa0dd20

              SHA1

              d309fca7d9d5c140d3326dafe7da469e212ed794

              SHA256

              cc516a83cbce9bc9ff809a3db887f9963b2c3355065b24c11904dd3970d5f426

              SHA512

              a1996955a3046818817f341129d34116035082effe038c87aa8a4aeae24ccf433fd403ed3e250bfb88bab48e97e10c4b045ccc9a95bb928fb917487e9e05e1e2

            • C:\Windows\SysWOW64\lljiyuec\yvnearnl.exe

              Filesize

              13.1MB

              MD5

              9af44930987c5c502268c2486891cfe2

              SHA1

              0500844cedb60b5c8478c79711743b9cf4f24fc4

              SHA256

              fa8a43df56a294f54d98065c5369fe35f1da18334c05bd53d9363fe5a9420f7f

              SHA512

              50e65c0842e0694f3ddc47caa3912d91d7493610ea119ede88b2aa763e8098b0e4779e6e77ccfa7dc538a50fa0e3fcfad189addf1a139c242d0a4a6c6906ad01

            • memory/2500-12-0x00000000010C0000-0x00000000010D5000-memory.dmp

              Filesize

              84KB

            • memory/2500-15-0x00000000010C0000-0x00000000010D5000-memory.dmp

              Filesize

              84KB

            • memory/2500-16-0x00000000010C0000-0x00000000010D5000-memory.dmp

              Filesize

              84KB

            • memory/2500-17-0x00000000010C0000-0x00000000010D5000-memory.dmp

              Filesize

              84KB

            • memory/2500-19-0x00000000010C0000-0x00000000010D5000-memory.dmp

              Filesize

              84KB

            • memory/3192-10-0x00000000008F0000-0x00000000009F0000-memory.dmp

              Filesize

              1024KB

            • memory/3192-11-0x0000000000400000-0x00000000008E9000-memory.dmp

              Filesize

              4.9MB

            • memory/3192-18-0x0000000000400000-0x00000000008E9000-memory.dmp

              Filesize

              4.9MB

            • memory/5112-4-0x0000000000400000-0x00000000008E9000-memory.dmp

              Filesize

              4.9MB

            • memory/5112-2-0x0000000000A40000-0x0000000000A53000-memory.dmp

              Filesize

              76KB

            • memory/5112-8-0x0000000000A40000-0x0000000000A53000-memory.dmp

              Filesize

              76KB

            • memory/5112-7-0x0000000000400000-0x00000000008E9000-memory.dmp

              Filesize

              4.9MB

            • memory/5112-1-0x0000000000BD0000-0x0000000000CD0000-memory.dmp

              Filesize

              1024KB