Analysis

  • max time kernel
    145s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231023-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231023-enlocale:en-usos:windows10-2004-x64system
  • submitted
    20/11/2023, 02:02

General

  • Target

    7e9ccdf57f7fe03c9e2efd738b6490aabed53615f70a101a8c1cd008716fa6d2.exe

  • Size

    338KB

  • MD5

    5c5387efb7f70cd46012c6f8f4cc0e1a

  • SHA1

    c2ad2a7be652d8b73cdeb794b498c03d8f783bc4

  • SHA256

    7e9ccdf57f7fe03c9e2efd738b6490aabed53615f70a101a8c1cd008716fa6d2

  • SHA512

    bc6a38573e87fc6bc7b945ee76f5b8102e5adfa1ff6262356212a0fb66f2b4cb071193df75f05da715627d1d4c5cb2cd733f786371bf271e5ee94f88557de65d

  • SSDEEP

    3072:M9xApN8qo8I+HI0C+iUn9wYaA8MqfvJLAiT12Rerybp80C:wTqoQHIbYatRJLAiT3ry3

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 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.

  • Deletes itself 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 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
  • GoLang User-Agent 1 IoCs

    Uses default user-agent string defined by GoLang HTTP packages.

  • Modifies data under HKEY_USERS 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\7e9ccdf57f7fe03c9e2efd738b6490aabed53615f70a101a8c1cd008716fa6d2.exe
    "C:\Users\Admin\AppData\Local\Temp\7e9ccdf57f7fe03c9e2efd738b6490aabed53615f70a101a8c1cd008716fa6d2.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1392
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\dmmvlhqw\
      2⤵
        PID:1908
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\xateenoo.exe" C:\Windows\SysWOW64\dmmvlhqw\
        2⤵
          PID:3356
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create dmmvlhqw binPath= "C:\Windows\SysWOW64\dmmvlhqw\xateenoo.exe /d\"C:\Users\Admin\AppData\Local\Temp\7e9ccdf57f7fe03c9e2efd738b6490aabed53615f70a101a8c1cd008716fa6d2.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3076
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description dmmvlhqw "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2692
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start dmmvlhqw
          2⤵
          • Launches sc.exe
          PID:1244
        • 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:60
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1392 -s 596
          2⤵
          • Program crash
          PID:3468
      • C:\Windows\SysWOW64\dmmvlhqw\xateenoo.exe
        C:\Windows\SysWOW64\dmmvlhqw\xateenoo.exe /d"C:\Users\Admin\AppData\Local\Temp\7e9ccdf57f7fe03c9e2efd738b6490aabed53615f70a101a8c1cd008716fa6d2.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1916
        • 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:3632
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1916 -s 192
          2⤵
          • Program crash
          PID:3992
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 464 -p 1392 -ip 1392
        1⤵
          PID:2288
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 1916 -ip 1916
          1⤵
            PID:864

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

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                Downloads

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

                  Filesize

                  13.2MB

                  MD5

                  05044f12a31f2d40107ed32bfb2c3715

                  SHA1

                  fce1ecc50ccda4a380b138c13992c446ce2c5d1a

                  SHA256

                  9f428f1e731e6b40c0bcb684db2a8b0d82dfc21e94ac04cc13adad1c3908330d

                  SHA512

                  9c63ea864da707582974028cf7f45be13541b6f983a75ec5f272a2fbecc9c6f3987c6cfa8958e1ed1f3d368d3866b4b7ce8b3fe9938413d3401cd62c1e844c7f

                • C:\Windows\SysWOW64\dmmvlhqw\xateenoo.exe

                  Filesize

                  13.2MB

                  MD5

                  05044f12a31f2d40107ed32bfb2c3715

                  SHA1

                  fce1ecc50ccda4a380b138c13992c446ce2c5d1a

                  SHA256

                  9f428f1e731e6b40c0bcb684db2a8b0d82dfc21e94ac04cc13adad1c3908330d

                  SHA512

                  9c63ea864da707582974028cf7f45be13541b6f983a75ec5f272a2fbecc9c6f3987c6cfa8958e1ed1f3d368d3866b4b7ce8b3fe9938413d3401cd62c1e844c7f

                • memory/1392-2-0x0000000000B50000-0x0000000000B63000-memory.dmp

                  Filesize

                  76KB

                • memory/1392-4-0x0000000000400000-0x000000000089D000-memory.dmp

                  Filesize

                  4.6MB

                • memory/1392-7-0x0000000000400000-0x000000000089D000-memory.dmp

                  Filesize

                  4.6MB

                • memory/1392-8-0x0000000000B50000-0x0000000000B63000-memory.dmp

                  Filesize

                  76KB

                • memory/1392-1-0x0000000000BB0000-0x0000000000CB0000-memory.dmp

                  Filesize

                  1024KB

                • memory/1916-17-0x0000000000400000-0x000000000089D000-memory.dmp

                  Filesize

                  4.6MB

                • memory/1916-10-0x0000000000A80000-0x0000000000B80000-memory.dmp

                  Filesize

                  1024KB

                • memory/1916-12-0x0000000000400000-0x000000000089D000-memory.dmp

                  Filesize

                  4.6MB

                • memory/3632-33-0x0000000002B60000-0x0000000002B70000-memory.dmp

                  Filesize

                  64KB

                • memory/3632-36-0x0000000002B60000-0x0000000002B70000-memory.dmp

                  Filesize

                  64KB

                • memory/3632-15-0x0000000000C90000-0x0000000000CA5000-memory.dmp

                  Filesize

                  84KB

                • memory/3632-18-0x0000000000C90000-0x0000000000CA5000-memory.dmp

                  Filesize

                  84KB

                • memory/3632-20-0x0000000002800000-0x0000000002A0F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/3632-23-0x0000000002800000-0x0000000002A0F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/3632-24-0x0000000002B50000-0x0000000002B56000-memory.dmp

                  Filesize

                  24KB

                • memory/3632-27-0x0000000002B60000-0x0000000002B70000-memory.dmp

                  Filesize

                  64KB

                • memory/3632-31-0x0000000002B60000-0x0000000002B70000-memory.dmp

                  Filesize

                  64KB

                • memory/3632-32-0x0000000002B60000-0x0000000002B70000-memory.dmp

                  Filesize

                  64KB

                • memory/3632-11-0x0000000000C90000-0x0000000000CA5000-memory.dmp

                  Filesize

                  84KB

                • memory/3632-30-0x0000000002B60000-0x0000000002B70000-memory.dmp

                  Filesize

                  64KB

                • memory/3632-35-0x0000000002B60000-0x0000000002B70000-memory.dmp

                  Filesize

                  64KB

                • memory/3632-34-0x0000000002B60000-0x0000000002B70000-memory.dmp

                  Filesize

                  64KB

                • memory/3632-37-0x0000000002B60000-0x0000000002B70000-memory.dmp

                  Filesize

                  64KB

                • memory/3632-16-0x0000000000C90000-0x0000000000CA5000-memory.dmp

                  Filesize

                  84KB

                • memory/3632-38-0x0000000002B60000-0x0000000002B70000-memory.dmp

                  Filesize

                  64KB

                • memory/3632-39-0x0000000002B60000-0x0000000002B70000-memory.dmp

                  Filesize

                  64KB

                • memory/3632-40-0x0000000002B60000-0x0000000002B70000-memory.dmp

                  Filesize

                  64KB

                • memory/3632-41-0x0000000002B60000-0x0000000002B70000-memory.dmp

                  Filesize

                  64KB

                • memory/3632-42-0x0000000002B60000-0x0000000002B70000-memory.dmp

                  Filesize

                  64KB

                • memory/3632-43-0x0000000002B60000-0x0000000002B70000-memory.dmp

                  Filesize

                  64KB

                • memory/3632-44-0x0000000002B60000-0x0000000002B70000-memory.dmp

                  Filesize

                  64KB

                • memory/3632-45-0x0000000002B60000-0x0000000002B70000-memory.dmp

                  Filesize

                  64KB

                • memory/3632-46-0x0000000002B60000-0x0000000002B70000-memory.dmp

                  Filesize

                  64KB

                • memory/3632-47-0x0000000002DF0000-0x0000000002DF5000-memory.dmp

                  Filesize

                  20KB

                • memory/3632-50-0x0000000002DF0000-0x0000000002DF5000-memory.dmp

                  Filesize

                  20KB

                • memory/3632-51-0x0000000007840000-0x0000000007C4B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/3632-54-0x0000000007840000-0x0000000007C4B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/3632-55-0x0000000007D90000-0x0000000007D97000-memory.dmp

                  Filesize

                  28KB

                • memory/3632-59-0x0000000000C90000-0x0000000000CA5000-memory.dmp

                  Filesize

                  84KB