Analysis

  • max time kernel
    149s
  • max time network
    149s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    18/12/2022, 20:10

General

  • Target

    file.exe

  • Size

    214KB

  • MD5

    951bcafb0a4e4b3a828af9a1cf16534b

  • SHA1

    f1ab2768fc107871852b73b5881284ebd40e6f9c

  • SHA256

    9441c5f3046b82e81197d9b09682bb13e6d1ed6e42afeacdbc9d627cf34d9c7d

  • SHA512

    cd8d9bd0cafcc04b8a65abaf43fb54ee01c869f5342225f6199f236805408b074858f3969fbbe8c2d839283ece900345dd014bd32c1147ae62b537cdf6c4711a

  • SSDEEP

    3072:c0F5wLy/9TwzaWR1i4zhshWWK97Reh1V/BYSENRAtOba+WCdVjcbImdzmuX:dFGLy/9wz31yhWD9Ne/+0YnjcbXF

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:2204
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\yneirlxp\
      2⤵
        PID:4808
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\wcujohy.exe" C:\Windows\SysWOW64\yneirlxp\
        2⤵
          PID:5048
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create yneirlxp binPath= "C:\Windows\SysWOW64\yneirlxp\wcujohy.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4964
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description yneirlxp "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2364
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start yneirlxp
          2⤵
          • Launches sc.exe
          PID:4172
        • 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:4456
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2204 -s 1044
          2⤵
          • Program crash
          PID:364
      • C:\Windows\SysWOW64\yneirlxp\wcujohy.exe
        C:\Windows\SysWOW64\yneirlxp\wcujohy.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4220
        • 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:3788
          • 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:2216
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4220 -s 532
          2⤵
          • Program crash
          PID:3204
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 2204 -ip 2204
        1⤵
          PID:224
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 528 -p 4220 -ip 4220
          1⤵
            PID:3324

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

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

                  Filesize

                  12.2MB

                  MD5

                  e1bceb5e4a5a4ff1ca51cc47d0d94717

                  SHA1

                  5f3176833006953ca11cfdb5567aaa9781e89d23

                  SHA256

                  9444cf635a5475289fa1528f336b8a231f1c808ed3ee2c7e53baa661436f1829

                  SHA512

                  2101e4fa9d83f62dcd103d321dbaebe52a8107693e708618517762970140eeb1ecddea92b7c00a9494e2af41dc39490de2bbe784a530d941bfb919c2ac0187d4

                • C:\Windows\SysWOW64\yneirlxp\wcujohy.exe

                  Filesize

                  12.2MB

                  MD5

                  e1bceb5e4a5a4ff1ca51cc47d0d94717

                  SHA1

                  5f3176833006953ca11cfdb5567aaa9781e89d23

                  SHA256

                  9444cf635a5475289fa1528f336b8a231f1c808ed3ee2c7e53baa661436f1829

                  SHA512

                  2101e4fa9d83f62dcd103d321dbaebe52a8107693e708618517762970140eeb1ecddea92b7c00a9494e2af41dc39490de2bbe784a530d941bfb919c2ac0187d4

                • memory/2204-144-0x00000000006F0000-0x0000000000703000-memory.dmp

                  Filesize

                  76KB

                • memory/2204-133-0x00000000006F0000-0x0000000000703000-memory.dmp

                  Filesize

                  76KB

                • memory/2204-135-0x0000000000400000-0x000000000045F000-memory.dmp

                  Filesize

                  380KB

                • memory/2204-132-0x0000000000729000-0x000000000073A000-memory.dmp

                  Filesize

                  68KB

                • memory/2204-145-0x0000000000400000-0x000000000045F000-memory.dmp

                  Filesize

                  380KB

                • memory/2204-143-0x0000000000729000-0x000000000073A000-memory.dmp

                  Filesize

                  68KB

                • memory/2216-178-0x0000000001200000-0x00000000012F1000-memory.dmp

                  Filesize

                  964KB

                • memory/2216-173-0x0000000001200000-0x00000000012F1000-memory.dmp

                  Filesize

                  964KB

                • memory/3788-169-0x00000000027E0000-0x00000000027E7000-memory.dmp

                  Filesize

                  28KB

                • memory/3788-166-0x0000000007140000-0x000000000754B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/3788-147-0x00000000003A0000-0x00000000003B5000-memory.dmp

                  Filesize

                  84KB

                • memory/3788-163-0x00000000027D0000-0x00000000027D5000-memory.dmp

                  Filesize

                  20KB

                • memory/3788-160-0x0000000001930000-0x0000000001940000-memory.dmp

                  Filesize

                  64KB

                • memory/3788-152-0x00000000003A0000-0x00000000003B5000-memory.dmp

                  Filesize

                  84KB

                • memory/3788-153-0x00000000003A0000-0x00000000003B5000-memory.dmp

                  Filesize

                  84KB

                • memory/3788-154-0x0000000002200000-0x000000000240F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/3788-157-0x0000000000C70000-0x0000000000C76000-memory.dmp

                  Filesize

                  24KB

                • memory/4220-151-0x0000000000400000-0x000000000045F000-memory.dmp

                  Filesize

                  380KB

                • memory/4220-150-0x0000000000772000-0x0000000000782000-memory.dmp

                  Filesize

                  64KB