Analysis

  • max time kernel
    159s
  • max time network
    166s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17-04-2024 13:35

General

  • Target

    755b1b45c26d282f094d504074bbdf897f6460968db67dd7d88a4702e03ef7f9.exe

  • Size

    203KB

  • MD5

    d88f7c78b3be6c96c33b80a8e1bb85de

  • SHA1

    ce07fb26b0ec69cdf563f98560aa4f7f298e6e8d

  • SHA256

    755b1b45c26d282f094d504074bbdf897f6460968db67dd7d88a4702e03ef7f9

  • SHA512

    1c396a26da383d01ddc317bc4c565c5825b0e452bcf262ac849cd720acb6cb7abcc08e895041e59246dd7686e72424990728745716815a5879bce30769e3e898

  • SSDEEP

    3072:Ef3B/ALaZdXUNc8iirJiM21K7uSbrF068c0E0rBNWRDxlH+cmH:Ef32clVO598c0EHxQco

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.

  • Creates new service(s) 1 TTPs
  • Modifies Windows Firewall 2 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.

  • Deletes itself 1 IoCs
  • 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 1 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 WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\755b1b45c26d282f094d504074bbdf897f6460968db67dd7d88a4702e03ef7f9.exe
    "C:\Users\Admin\AppData\Local\Temp\755b1b45c26d282f094d504074bbdf897f6460968db67dd7d88a4702e03ef7f9.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2432
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\gpltedac\
      2⤵
        PID:4672
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ugolreki.exe" C:\Windows\SysWOW64\gpltedac\
        2⤵
          PID:4308
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create gpltedac binPath= "C:\Windows\SysWOW64\gpltedac\ugolreki.exe /d\"C:\Users\Admin\AppData\Local\Temp\755b1b45c26d282f094d504074bbdf897f6460968db67dd7d88a4702e03ef7f9.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1764
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description gpltedac "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2336
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start gpltedac
          2⤵
          • Launches sc.exe
          PID:2552
        • 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:420
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2432 -s 1204
          2⤵
          • Program crash
          PID:3416
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 2432 -ip 2432
        1⤵
          PID:4040
        • C:\Windows\SysWOW64\gpltedac\ugolreki.exe
          C:\Windows\SysWOW64\gpltedac\ugolreki.exe /d"C:\Users\Admin\AppData\Local\Temp\755b1b45c26d282f094d504074bbdf897f6460968db67dd7d88a4702e03ef7f9.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:456
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe
            2⤵
            • Sets service image path in registry
            • Deletes itself
            • Drops file in System32 directory
            • Modifies data under HKEY_USERS
            PID:3308
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 456 -s 520
            2⤵
            • Program crash
            PID:4860
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 488 -p 456 -ip 456
          1⤵
            PID:5060
          • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
            "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=1412 --field-trial-handle=2744,i,16362475727591565961,3676688664819797550,262144 --variations-seed-version /prefetch:8
            1⤵
              PID:2868

            Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

            Loading Replay Monitor...

            Downloads

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

              Filesize

              11.3MB

              MD5

              4cf246f885f5ee2142b7403c01a5022f

              SHA1

              c7a440fe737e3dbff94fcd8628b345f231af01ce

              SHA256

              a9ae6ede0a21bf2757e5dc6a77ee60d8fd487f01f05155c03cbd350ee8de1d89

              SHA512

              6ffb6516bfab5cf310cfd7ed7e522d5026ad016a19ed8213107a74ff8c60ab49b631c84f5b7f6605761cd93b848b30977d6f08038983ca84fe5e3c0c38b9b40c

            • memory/456-17-0x0000000000400000-0x0000000000438000-memory.dmp

              Filesize

              224KB

            • memory/456-13-0x0000000000670000-0x0000000000770000-memory.dmp

              Filesize

              1024KB

            • memory/456-14-0x0000000000400000-0x0000000000438000-memory.dmp

              Filesize

              224KB

            • memory/2432-2-0x0000000000520000-0x0000000000533000-memory.dmp

              Filesize

              76KB

            • memory/2432-3-0x0000000000400000-0x0000000000438000-memory.dmp

              Filesize

              224KB

            • memory/2432-4-0x0000000000400000-0x0000000000438000-memory.dmp

              Filesize

              224KB

            • memory/2432-6-0x0000000000400000-0x0000000000438000-memory.dmp

              Filesize

              224KB

            • memory/2432-8-0x0000000000540000-0x0000000000640000-memory.dmp

              Filesize

              1024KB

            • memory/2432-10-0x0000000000520000-0x0000000000533000-memory.dmp

              Filesize

              76KB

            • memory/2432-11-0x0000000000400000-0x0000000000438000-memory.dmp

              Filesize

              224KB

            • memory/2432-1-0x0000000000540000-0x0000000000640000-memory.dmp

              Filesize

              1024KB

            • memory/3308-33-0x00000000023C0000-0x00000000023D0000-memory.dmp

              Filesize

              64KB

            • memory/3308-40-0x00000000023C0000-0x00000000023D0000-memory.dmp

              Filesize

              64KB

            • memory/3308-20-0x0000000000F00000-0x0000000000F15000-memory.dmp

              Filesize

              84KB

            • memory/3308-21-0x0000000000F00000-0x0000000000F15000-memory.dmp

              Filesize

              84KB

            • memory/3308-23-0x0000000002C00000-0x0000000002E0F000-memory.dmp

              Filesize

              2.1MB

            • memory/3308-26-0x0000000002C00000-0x0000000002E0F000-memory.dmp

              Filesize

              2.1MB

            • memory/3308-27-0x00000000023B0000-0x00000000023B6000-memory.dmp

              Filesize

              24KB

            • memory/3308-30-0x00000000023C0000-0x00000000023D0000-memory.dmp

              Filesize

              64KB

            • memory/3308-15-0x0000000000F00000-0x0000000000F15000-memory.dmp

              Filesize

              84KB

            • memory/3308-34-0x00000000023C0000-0x00000000023D0000-memory.dmp

              Filesize

              64KB

            • memory/3308-37-0x00000000023C0000-0x00000000023D0000-memory.dmp

              Filesize

              64KB

            • memory/3308-38-0x00000000023C0000-0x00000000023D0000-memory.dmp

              Filesize

              64KB

            • memory/3308-36-0x00000000023C0000-0x00000000023D0000-memory.dmp

              Filesize

              64KB

            • memory/3308-35-0x00000000023C0000-0x00000000023D0000-memory.dmp

              Filesize

              64KB

            • memory/3308-39-0x00000000023C0000-0x00000000023D0000-memory.dmp

              Filesize

              64KB

            • memory/3308-19-0x0000000000F00000-0x0000000000F15000-memory.dmp

              Filesize

              84KB

            • memory/3308-41-0x00000000023C0000-0x00000000023D0000-memory.dmp

              Filesize

              64KB

            • memory/3308-42-0x00000000023C0000-0x00000000023D0000-memory.dmp

              Filesize

              64KB

            • memory/3308-43-0x00000000023C0000-0x00000000023D0000-memory.dmp

              Filesize

              64KB

            • memory/3308-44-0x00000000023C0000-0x00000000023D0000-memory.dmp

              Filesize

              64KB

            • memory/3308-46-0x00000000023C0000-0x00000000023D0000-memory.dmp

              Filesize

              64KB

            • memory/3308-47-0x00000000023C0000-0x00000000023D0000-memory.dmp

              Filesize

              64KB

            • memory/3308-50-0x00000000023D0000-0x00000000023D5000-memory.dmp

              Filesize

              20KB

            • memory/3308-49-0x00000000023C0000-0x00000000023D0000-memory.dmp

              Filesize

              64KB

            • memory/3308-53-0x00000000023D0000-0x00000000023D5000-memory.dmp

              Filesize

              20KB

            • memory/3308-54-0x0000000007B00000-0x0000000007F0B000-memory.dmp

              Filesize

              4.0MB

            • memory/3308-48-0x00000000023C0000-0x00000000023D0000-memory.dmp

              Filesize

              64KB

            • memory/3308-45-0x00000000023C0000-0x00000000023D0000-memory.dmp

              Filesize

              64KB

            • memory/3308-57-0x0000000007B00000-0x0000000007F0B000-memory.dmp

              Filesize

              4.0MB

            • memory/3308-58-0x00000000023E0000-0x00000000023E7000-memory.dmp

              Filesize

              28KB

            • memory/3308-62-0x0000000000F00000-0x0000000000F15000-memory.dmp

              Filesize

              84KB