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Analysis

  • max time kernel
    147s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230621-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230621-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03/07/2023, 16:01

General

  • Target

    file.exe

  • Size

    260KB

  • MD5

    f01168e4b610509f528bca4d244fa0a1

  • SHA1

    b617e4328af65e81135b77da92d6829f4dbc305f

  • SHA256

    0d10d157a9b1346c1f5c737e4912ce3738facda1e74fdd0a4a1fb2c36a6374ec

  • SHA512

    8717fbc01e6a67dc4a8a66cffbf8892ab883446831483a7b97c6260dded02b06e3bf3dbf24cc740dee607130e0204c9681e4b274369ac111692550b16ba67d72

  • SSDEEP

    3072:N9ksIUovdgSsy7mfeYqLez+wkNAf875or0FUzI6JrWPbB6jM:Q2Ssy7m1qKz+w4/7+RWzE

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
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • 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).

  • 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:1496
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\zfezdibp\
      2⤵
        PID:100
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\lszcrfyi.exe" C:\Windows\SysWOW64\zfezdibp\
        2⤵
          PID:3188
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create zfezdibp binPath= "C:\Windows\SysWOW64\zfezdibp\lszcrfyi.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4216
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description zfezdibp "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1900
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start zfezdibp
          2⤵
          • Launches sc.exe
          PID:1404
        • 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:4800
      • C:\Windows\SysWOW64\zfezdibp\lszcrfyi.exe
        C:\Windows\SysWOW64\zfezdibp\lszcrfyi.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2616
        • 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:2412
          • 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:2560

      Network

      MITRE ATT&CK Enterprise v6

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        Filesize

        11.3MB

        MD5

        c95a3043cb4134895d611aa102a9c733

        SHA1

        110357d8955b54a5ce7663ab60d9ec40cb11038a

        SHA256

        c8586b486021c724c3be5755487d115bc81dd2f40aab3ead5f54755929f37531

        SHA512

        842dba4353e2fe5756c665fb9a2154ab97a717b3507f638c3d61080d760020288d97a179ad9b497f2914d12ad9ef645fa428d30e83a0b67594f99af76acb655e

      • C:\Windows\SysWOW64\zfezdibp\lszcrfyi.exe

        Filesize

        11.3MB

        MD5

        c95a3043cb4134895d611aa102a9c733

        SHA1

        110357d8955b54a5ce7663ab60d9ec40cb11038a

        SHA256

        c8586b486021c724c3be5755487d115bc81dd2f40aab3ead5f54755929f37531

        SHA512

        842dba4353e2fe5756c665fb9a2154ab97a717b3507f638c3d61080d760020288d97a179ad9b497f2914d12ad9ef645fa428d30e83a0b67594f99af76acb655e

      • memory/1496-135-0x0000000001C90000-0x0000000001CA3000-memory.dmp

        Filesize

        76KB

      • memory/1496-138-0x0000000000400000-0x0000000001B44000-memory.dmp

        Filesize

        23.3MB

      • memory/2412-167-0x0000000001BF0000-0x0000000001C00000-memory.dmp

        Filesize

        64KB

      • memory/2412-163-0x0000000001BF0000-0x0000000001C00000-memory.dmp

        Filesize

        64KB

      • memory/2412-145-0x0000000000560000-0x0000000000575000-memory.dmp

        Filesize

        84KB

      • memory/2412-184-0x00000000027E0000-0x00000000027E7000-memory.dmp

        Filesize

        28KB

      • memory/2412-146-0x0000000000560000-0x0000000000575000-memory.dmp

        Filesize

        84KB

      • memory/2412-148-0x0000000000560000-0x0000000000575000-memory.dmp

        Filesize

        84KB

      • memory/2412-149-0x0000000002400000-0x000000000260F000-memory.dmp

        Filesize

        2.1MB

      • memory/2412-152-0x0000000002400000-0x000000000260F000-memory.dmp

        Filesize

        2.1MB

      • memory/2412-153-0x0000000001BE0000-0x0000000001BE6000-memory.dmp

        Filesize

        24KB

      • memory/2412-156-0x0000000001BF0000-0x0000000001C00000-memory.dmp

        Filesize

        64KB

      • memory/2412-159-0x0000000001BF0000-0x0000000001C00000-memory.dmp

        Filesize

        64KB

      • memory/2412-160-0x0000000001BF0000-0x0000000001C00000-memory.dmp

        Filesize

        64KB

      • memory/2412-161-0x0000000001BF0000-0x0000000001C00000-memory.dmp

        Filesize

        64KB

      • memory/2412-162-0x0000000001BF0000-0x0000000001C00000-memory.dmp

        Filesize

        64KB

      • memory/2412-168-0x0000000001BF0000-0x0000000001C00000-memory.dmp

        Filesize

        64KB

      • memory/2412-164-0x0000000001BF0000-0x0000000001C00000-memory.dmp

        Filesize

        64KB

      • memory/2412-166-0x0000000001BF0000-0x0000000001C00000-memory.dmp

        Filesize

        64KB

      • memory/2412-165-0x0000000001BF0000-0x0000000001C00000-memory.dmp

        Filesize

        64KB

      • memory/2412-144-0x0000000000560000-0x0000000000575000-memory.dmp

        Filesize

        84KB

      • memory/2412-140-0x0000000000560000-0x0000000000575000-memory.dmp

        Filesize

        84KB

      • memory/2412-175-0x0000000001BF0000-0x0000000001C00000-memory.dmp

        Filesize

        64KB

      • memory/2412-170-0x0000000001BF0000-0x0000000001C00000-memory.dmp

        Filesize

        64KB

      • memory/2412-171-0x0000000001BF0000-0x0000000001C00000-memory.dmp

        Filesize

        64KB

      • memory/2412-172-0x0000000001BF0000-0x0000000001C00000-memory.dmp

        Filesize

        64KB

      • memory/2412-173-0x0000000001BF0000-0x0000000001C00000-memory.dmp

        Filesize

        64KB

      • memory/2412-169-0x0000000001BF0000-0x0000000001C00000-memory.dmp

        Filesize

        64KB

      • memory/2412-174-0x0000000001BF0000-0x0000000001C00000-memory.dmp

        Filesize

        64KB

      • memory/2412-176-0x00000000027D0000-0x00000000027D5000-memory.dmp

        Filesize

        20KB

      • memory/2412-179-0x00000000027D0000-0x00000000027D5000-memory.dmp

        Filesize

        20KB

      • memory/2412-180-0x0000000007300000-0x000000000770B000-memory.dmp

        Filesize

        4.0MB

      • memory/2412-183-0x0000000007300000-0x000000000770B000-memory.dmp

        Filesize

        4.0MB

      • memory/2560-188-0x0000000000680000-0x0000000000771000-memory.dmp

        Filesize

        964KB

      • memory/2560-193-0x0000000000680000-0x0000000000771000-memory.dmp

        Filesize

        964KB

      • memory/2560-194-0x0000000000680000-0x0000000000771000-memory.dmp

        Filesize

        964KB

      • memory/2560-195-0x0000000000680000-0x0000000000771000-memory.dmp

        Filesize

        964KB

      • memory/2560-196-0x0000000000680000-0x0000000000771000-memory.dmp

        Filesize

        964KB

      • memory/2560-197-0x0000000000680000-0x0000000000771000-memory.dmp

        Filesize

        964KB

      • memory/2560-198-0x0000000000680000-0x0000000000771000-memory.dmp

        Filesize

        964KB

      • memory/2560-199-0x0000000000680000-0x0000000000771000-memory.dmp

        Filesize

        964KB

      • memory/2616-141-0x0000000000400000-0x0000000001B44000-memory.dmp

        Filesize

        23.3MB