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Analysis

  • max time kernel
    148s
  • max time network
    154s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230703-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230703-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03/07/2023, 23:19

General

  • Target

    file.exe

  • Size

    304KB

  • MD5

    f7a4259a3b2ab96e30cb58c4e5cda3e6

  • SHA1

    40bb757854553230616307cd50c811ac25ba535f

  • SHA256

    3c7379928cdae48f4a016111467d0ecf2abba802e3e0003b79fa93dc48e62087

  • SHA512

    3c0a22e0692c964013f3799686647cab9f37f88fe4121c18d18d9c62b33d52da612780fd69ff055d7b8104197ea7483294575ef996c3fe83cf4718aa4a9eae84

  • SSDEEP

    3072:qnlW2D7U6wBsgnSPpXU1ReqVY9qnGw7nHHVKJ0TN6YrhHwCD25Gja:QU6gSRXU1lVY9SGink0NzrdDX

Malware Config

Extracted

Family

tofsee

C2

vanaheim.cn

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 8 IoCs
  • Creates new service(s) 1 TTPs
  • 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.

  • Executes dropped EXE 1 IoCs
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • 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).

  • Program crash 2 IoCs
  • GoLang User-Agent 1 IoCs

    Uses default user-agent string defined by GoLang HTTP packages.

  • 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:1948
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\smforcuf\
      2⤵
        PID:3016
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\kaaxjvlj.exe" C:\Windows\SysWOW64\smforcuf\
        2⤵
          PID:3440
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create smforcuf binPath= "C:\Windows\SysWOW64\smforcuf\kaaxjvlj.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4340
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description smforcuf "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4596
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start smforcuf
          2⤵
          • Launches sc.exe
          PID:3844
        • 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:2664
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1948 -s 1036
          2⤵
          • Program crash
          PID:4376
      • C:\Windows\SysWOW64\smforcuf\kaaxjvlj.exe
        C:\Windows\SysWOW64\smforcuf\kaaxjvlj.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:812
        • 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:1424
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe -o fastpool.xyz:10060 -u 9mLwUkiK8Yp89zQQYodWKN29jVVVz1cWDFZctWxge16Zi3TpHnSBnnVcCDhSRXdesnMBdVjtDwh1N71KD9z37EzgKSM1tmS.70000 -p x -k -a cn/half
            3⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:3612
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 812 -s 512
          2⤵
          • Program crash
          PID:2492
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 1948 -ip 1948
        1⤵
          PID:4972
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 412 -p 812 -ip 812
          1⤵
            PID:4144

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            14.0MB

            MD5

            7a479a94e11b73292a37bf4ce72daddf

            SHA1

            51a75c2c1097bdf59e254f2f070c4af15a8210f4

            SHA256

            edec4f0dc22b1243a5c322ae6fa09039fdfc445d181dc86bfe19032371ad1d34

            SHA512

            c3a4166580e282bda26360725e866ed6d961d6be236faa9e7fc0eb1b601758c49b6338c13438ca51ce34afc60dcccdad3ec877b95dd438527388abdcb7652049

          • C:\Windows\SysWOW64\smforcuf\kaaxjvlj.exe

            Filesize

            14.0MB

            MD5

            7a479a94e11b73292a37bf4ce72daddf

            SHA1

            51a75c2c1097bdf59e254f2f070c4af15a8210f4

            SHA256

            edec4f0dc22b1243a5c322ae6fa09039fdfc445d181dc86bfe19032371ad1d34

            SHA512

            c3a4166580e282bda26360725e866ed6d961d6be236faa9e7fc0eb1b601758c49b6338c13438ca51ce34afc60dcccdad3ec877b95dd438527388abdcb7652049

          • memory/812-144-0x0000000000400000-0x0000000000461000-memory.dmp

            Filesize

            388KB

          • memory/1424-168-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

            Filesize

            64KB

          • memory/1424-167-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

            Filesize

            64KB

          • memory/1424-143-0x0000000000C40000-0x0000000000C55000-memory.dmp

            Filesize

            84KB

          • memory/1424-184-0x0000000001FF0000-0x0000000001FF7000-memory.dmp

            Filesize

            28KB

          • memory/1424-145-0x0000000000C40000-0x0000000000C55000-memory.dmp

            Filesize

            84KB

          • memory/1424-146-0x0000000000C40000-0x0000000000C55000-memory.dmp

            Filesize

            84KB

          • memory/1424-148-0x0000000000C40000-0x0000000000C55000-memory.dmp

            Filesize

            84KB

          • memory/1424-149-0x0000000002800000-0x0000000002A0F000-memory.dmp

            Filesize

            2.1MB

          • memory/1424-152-0x0000000002800000-0x0000000002A0F000-memory.dmp

            Filesize

            2.1MB

          • memory/1424-153-0x0000000001FC0000-0x0000000001FC6000-memory.dmp

            Filesize

            24KB

          • memory/1424-156-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

            Filesize

            64KB

          • memory/1424-159-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

            Filesize

            64KB

          • memory/1424-160-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

            Filesize

            64KB

          • memory/1424-161-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

            Filesize

            64KB

          • memory/1424-163-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

            Filesize

            64KB

          • memory/1424-162-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

            Filesize

            64KB

          • memory/1424-164-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

            Filesize

            64KB

          • memory/1424-165-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

            Filesize

            64KB

          • memory/1424-166-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

            Filesize

            64KB

          • memory/1424-183-0x0000000007800000-0x0000000007C0B000-memory.dmp

            Filesize

            4.0MB

          • memory/1424-140-0x0000000000C40000-0x0000000000C55000-memory.dmp

            Filesize

            84KB

          • memory/1424-171-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

            Filesize

            64KB

          • memory/1424-169-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

            Filesize

            64KB

          • memory/1424-170-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

            Filesize

            64KB

          • memory/1424-172-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

            Filesize

            64KB

          • memory/1424-174-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

            Filesize

            64KB

          • memory/1424-175-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

            Filesize

            64KB

          • memory/1424-173-0x0000000001FD0000-0x0000000001FE0000-memory.dmp

            Filesize

            64KB

          • memory/1424-176-0x0000000001FE0000-0x0000000001FE5000-memory.dmp

            Filesize

            20KB

          • memory/1424-179-0x0000000001FE0000-0x0000000001FE5000-memory.dmp

            Filesize

            20KB

          • memory/1424-180-0x0000000007800000-0x0000000007C0B000-memory.dmp

            Filesize

            4.0MB

          • memory/1948-135-0x00000000008D0000-0x00000000008E3000-memory.dmp

            Filesize

            76KB

          • memory/1948-138-0x0000000000400000-0x0000000000461000-memory.dmp

            Filesize

            388KB

          • memory/3612-188-0x0000000000C30000-0x0000000000D21000-memory.dmp

            Filesize

            964KB

          • memory/3612-193-0x0000000000C30000-0x0000000000D21000-memory.dmp

            Filesize

            964KB

          • memory/3612-194-0x0000000000C30000-0x0000000000D21000-memory.dmp

            Filesize

            964KB

          • memory/3612-195-0x0000000000C30000-0x0000000000D21000-memory.dmp

            Filesize

            964KB

          • memory/3612-196-0x0000000000C30000-0x0000000000D21000-memory.dmp

            Filesize

            964KB

          • memory/3612-197-0x0000000000C30000-0x0000000000D21000-memory.dmp

            Filesize

            964KB

          • memory/3612-198-0x0000000000C30000-0x0000000000D21000-memory.dmp

            Filesize

            964KB

          • memory/3612-199-0x0000000000C30000-0x0000000000D21000-memory.dmp

            Filesize

            964KB