Analysis

  • max time kernel
    149s
  • max time network
    147s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
  • submitted
    12-05-2023 15:06

General

  • Target

    file.exe

  • Size

    322KB

  • MD5

    c5b9c27223bd12c6e6a0c46e5b411e27

  • SHA1

    68a98a64db6df5bd1feb25288220d186da8fd718

  • SHA256

    8cc3efde2ca85f0d6fcb6c96beb65869fdf024b3f948c1de79194e7988446a48

  • SHA512

    a3d3cdb3b4b1ba88000fc458a4def99973d4a0794b9e85bd0f156643c925f3baaebe9f3a900f8b260568af484671c6c0d541e7403a6d7075a1783088ba630299

  • SSDEEP

    3072:1KPtaVfzJ+xzpxIUgpnvKxvGbqqV7gPCs5lQYFwGfABn/9vOsJp7t:QetWkUIy4bVyCs5ZQ/OI

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\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2548
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\fetwgez\
      2⤵
        PID:2024
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ybuffopp.exe" C:\Windows\SysWOW64\fetwgez\
        2⤵
          PID:3204
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create fetwgez binPath= "C:\Windows\SysWOW64\fetwgez\ybuffopp.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2808
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description fetwgez "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3544
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start fetwgez
          2⤵
          • Launches sc.exe
          PID:4800
        • 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:3164
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2548 -s 1160
          2⤵
          • Program crash
          PID:3244
      • C:\Windows\SysWOW64\fetwgez\ybuffopp.exe
        C:\Windows\SysWOW64\fetwgez\ybuffopp.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1784
        • 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:2096
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe --algo=cn-heavy/xhv -o fastpool.xyz:10162 -u abLocBRHmSKSwfZexhaPDFFpUd1Szsp1RWPZktGDuK2w76S3KYNSLGndi55YtoHoKYbSFMCCWjxzTfwHxZSm7sNLe2rAq4DqbAF.70000 -p x -k
            3⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:936
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1784 -s 508
          2⤵
          • Program crash
          PID:700
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 464 -p 2548 -ip 2548
        1⤵
          PID:5092
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 528 -p 1784 -ip 1784
          1⤵
            PID:4312

          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\ybuffopp.exe
            Filesize

            11.2MB

            MD5

            01d00032e39c5729b872bfb406e8de91

            SHA1

            daa7944bfac8f809c3351f5f3980767358c9830c

            SHA256

            820f4835253fdf092f9bad54dde05ea041486ea3d0c0304c17e66c08986723e8

            SHA512

            c5c3e23ba263bf541b9a28acb70671c0d1824cf470e76e856182444e9397bbdaa2ff1c01ceafba2b5de8a98909585a09c90e696159d32f18e1e5048518e14892

          • C:\Windows\SysWOW64\fetwgez\ybuffopp.exe
            Filesize

            11.2MB

            MD5

            01d00032e39c5729b872bfb406e8de91

            SHA1

            daa7944bfac8f809c3351f5f3980767358c9830c

            SHA256

            820f4835253fdf092f9bad54dde05ea041486ea3d0c0304c17e66c08986723e8

            SHA512

            c5c3e23ba263bf541b9a28acb70671c0d1824cf470e76e856182444e9397bbdaa2ff1c01ceafba2b5de8a98909585a09c90e696159d32f18e1e5048518e14892

          • memory/936-188-0x0000000000D20000-0x0000000000E11000-memory.dmp
            Filesize

            964KB

          • memory/936-199-0x0000000000D20000-0x0000000000E11000-memory.dmp
            Filesize

            964KB

          • memory/936-198-0x0000000000D20000-0x0000000000E11000-memory.dmp
            Filesize

            964KB

          • memory/936-197-0x0000000000D20000-0x0000000000E11000-memory.dmp
            Filesize

            964KB

          • memory/936-195-0x0000000000D20000-0x0000000000E11000-memory.dmp
            Filesize

            964KB

          • memory/936-196-0x0000000000D20000-0x0000000000E11000-memory.dmp
            Filesize

            964KB

          • memory/936-194-0x0000000000D20000-0x0000000000E11000-memory.dmp
            Filesize

            964KB

          • memory/936-193-0x0000000000D20000-0x0000000000E11000-memory.dmp
            Filesize

            964KB

          • memory/1784-144-0x0000000000400000-0x00000000006CE000-memory.dmp
            Filesize

            2.8MB

          • memory/2096-167-0x00000000007F0000-0x0000000000800000-memory.dmp
            Filesize

            64KB

          • memory/2096-173-0x00000000007F0000-0x0000000000800000-memory.dmp
            Filesize

            64KB

          • memory/2096-156-0x00000000007F0000-0x0000000000800000-memory.dmp
            Filesize

            64KB

          • memory/2096-159-0x00000000007F0000-0x0000000000800000-memory.dmp
            Filesize

            64KB

          • memory/2096-160-0x00000000007F0000-0x0000000000800000-memory.dmp
            Filesize

            64KB

          • memory/2096-161-0x00000000007F0000-0x0000000000800000-memory.dmp
            Filesize

            64KB

          • memory/2096-163-0x00000000007F0000-0x0000000000800000-memory.dmp
            Filesize

            64KB

          • memory/2096-162-0x00000000007F0000-0x0000000000800000-memory.dmp
            Filesize

            64KB

          • memory/2096-164-0x00000000007F0000-0x0000000000800000-memory.dmp
            Filesize

            64KB

          • memory/2096-165-0x00000000007F0000-0x0000000000800000-memory.dmp
            Filesize

            64KB

          • memory/2096-166-0x00000000007F0000-0x0000000000800000-memory.dmp
            Filesize

            64KB

          • memory/2096-140-0x0000000000610000-0x0000000000625000-memory.dmp
            Filesize

            84KB

          • memory/2096-169-0x00000000007F0000-0x0000000000800000-memory.dmp
            Filesize

            64KB

          • memory/2096-170-0x00000000007F0000-0x0000000000800000-memory.dmp
            Filesize

            64KB

          • memory/2096-171-0x00000000007F0000-0x0000000000800000-memory.dmp
            Filesize

            64KB

          • memory/2096-168-0x00000000007F0000-0x0000000000800000-memory.dmp
            Filesize

            64KB

          • memory/2096-172-0x00000000007F0000-0x0000000000800000-memory.dmp
            Filesize

            64KB

          • memory/2096-153-0x00000000007E0000-0x00000000007E6000-memory.dmp
            Filesize

            24KB

          • memory/2096-174-0x00000000007F0000-0x0000000000800000-memory.dmp
            Filesize

            64KB

          • memory/2096-175-0x00000000007F0000-0x0000000000800000-memory.dmp
            Filesize

            64KB

          • memory/2096-176-0x0000000000FD0000-0x0000000000FD5000-memory.dmp
            Filesize

            20KB

          • memory/2096-179-0x0000000000FD0000-0x0000000000FD5000-memory.dmp
            Filesize

            20KB

          • memory/2096-180-0x0000000007200000-0x000000000760B000-memory.dmp
            Filesize

            4.0MB

          • memory/2096-183-0x0000000007200000-0x000000000760B000-memory.dmp
            Filesize

            4.0MB

          • memory/2096-184-0x0000000000FE0000-0x0000000000FE7000-memory.dmp
            Filesize

            28KB

          • memory/2096-152-0x0000000002200000-0x000000000240F000-memory.dmp
            Filesize

            2.1MB

          • memory/2096-149-0x0000000002200000-0x000000000240F000-memory.dmp
            Filesize

            2.1MB

          • memory/2096-148-0x0000000000610000-0x0000000000625000-memory.dmp
            Filesize

            84KB

          • memory/2096-146-0x0000000000610000-0x0000000000625000-memory.dmp
            Filesize

            84KB

          • memory/2096-145-0x0000000000610000-0x0000000000625000-memory.dmp
            Filesize

            84KB

          • memory/2096-143-0x0000000000610000-0x0000000000625000-memory.dmp
            Filesize

            84KB

          • memory/2548-135-0x0000000000820000-0x0000000000833000-memory.dmp
            Filesize

            76KB

          • memory/2548-138-0x0000000000400000-0x00000000006CE000-memory.dmp
            Filesize

            2.8MB