Analysis

  • max time kernel
    148s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240412-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17-04-2024 13:20

General

  • Target

    9dc0085f64473ca82753f59552bae76c64b5165e72899d727cd18f4d1afbd9d1.exe

  • Size

    233KB

  • MD5

    e1fd44ce08b0383dc59e732bb0b1f2d9

  • SHA1

    70dc0dba88f5b4d02f554627ec8fce32b9237fcc

  • SHA256

    9dc0085f64473ca82753f59552bae76c64b5165e72899d727cd18f4d1afbd9d1

  • SHA512

    7db8ae6bbead6c8603fda377b70cf05f793a795ca29cef50a97c6df148c4ecf5677880177016d7e65e51b204bbeed22b07e31f9d021305ea7a350b7130121d0d

  • SSDEEP

    3072:TcYelBc/ctFykDqPogVwsvhQNW3k1QxCJ18YcRfIBvd4rm5qe4EY3jXO9ZJwVQk:TcdBJ+PojEk1QEJq1FIBv74E2OTF

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
  • 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\9dc0085f64473ca82753f59552bae76c64b5165e72899d727cd18f4d1afbd9d1.exe
    "C:\Users\Admin\AppData\Local\Temp\9dc0085f64473ca82753f59552bae76c64b5165e72899d727cd18f4d1afbd9d1.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2760
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\fedhpogv\
      2⤵
        PID:3856
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\eqchekjx.exe" C:\Windows\SysWOW64\fedhpogv\
        2⤵
          PID:1132
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create fedhpogv binPath= "C:\Windows\SysWOW64\fedhpogv\eqchekjx.exe /d\"C:\Users\Admin\AppData\Local\Temp\9dc0085f64473ca82753f59552bae76c64b5165e72899d727cd18f4d1afbd9d1.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2328
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description fedhpogv "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2640
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start fedhpogv
          2⤵
          • Launches sc.exe
          PID:3184
        • 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:4652
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2760 -s 1036
          2⤵
          • Program crash
          PID:716
      • C:\Windows\SysWOW64\fedhpogv\eqchekjx.exe
        C:\Windows\SysWOW64\fedhpogv\eqchekjx.exe /d"C:\Users\Admin\AppData\Local\Temp\9dc0085f64473ca82753f59552bae76c64b5165e72899d727cd18f4d1afbd9d1.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2024
        • 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:888
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2024 -s 520
          2⤵
          • Program crash
          PID:5064
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 2024 -ip 2024
        1⤵
          PID:1676
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 516 -p 2760 -ip 2760
          1⤵
            PID:3728

          Network

          MITRE ATT&CK Matrix ATT&CK v13

          Persistence

          Create or Modify System Process

          2
          T1543

          Windows Service

          2
          T1543.003

          Boot or Logon Autostart Execution

          1
          T1547

          Registry Run Keys / Startup Folder

          1
          T1547.001

          Privilege Escalation

          Create or Modify System Process

          2
          T1543

          Windows Service

          2
          T1543.003

          Boot or Logon Autostart Execution

          1
          T1547

          Registry Run Keys / Startup Folder

          1
          T1547.001

          Defense Evasion

          Impair Defenses

          1
          T1562

          Disable or Modify System Firewall

          1
          T1562.004

          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\eqchekjx.exe
            Filesize

            14.6MB

            MD5

            0643e89bfa0be97d0d40bd06557dc45d

            SHA1

            dc248ed6a7a883deaa01f7eb75e8c6d0a62d2ef8

            SHA256

            238f59054f2ce4f76c2b8b5359ccccbdb2cbf16a2bc14a0e653f9bcff171be7a

            SHA512

            4b8077e89754aa1d6aeb81f30681b97328a3650c0a6dcdb0d5a5fe8328b6cdb58a4a380d66df755753612829e4c369d4afbef9b0413c4e4e7a2cd2cf75a02c93

          • memory/888-36-0x0000000001F60000-0x0000000001F70000-memory.dmp
            Filesize

            64KB

          • memory/888-32-0x0000000001F60000-0x0000000001F70000-memory.dmp
            Filesize

            64KB

          • memory/888-59-0x00000000009A0000-0x00000000009B5000-memory.dmp
            Filesize

            84KB

          • memory/888-11-0x00000000009A0000-0x00000000009B5000-memory.dmp
            Filesize

            84KB

          • memory/888-45-0x0000000001F60000-0x0000000001F70000-memory.dmp
            Filesize

            64KB

          • memory/888-30-0x0000000001F60000-0x0000000001F70000-memory.dmp
            Filesize

            64KB

          • memory/888-31-0x0000000001F60000-0x0000000001F70000-memory.dmp
            Filesize

            64KB

          • memory/888-14-0x00000000009A0000-0x00000000009B5000-memory.dmp
            Filesize

            84KB

          • memory/888-54-0x0000000007780000-0x0000000007B8B000-memory.dmp
            Filesize

            4.0MB

          • memory/888-44-0x0000000001F60000-0x0000000001F70000-memory.dmp
            Filesize

            64KB

          • memory/888-17-0x00000000009A0000-0x00000000009B5000-memory.dmp
            Filesize

            84KB

          • memory/888-18-0x00000000009A0000-0x00000000009B5000-memory.dmp
            Filesize

            84KB

          • memory/888-20-0x0000000002800000-0x0000000002A0F000-memory.dmp
            Filesize

            2.1MB

          • memory/888-47-0x0000000001FF0000-0x0000000001FF5000-memory.dmp
            Filesize

            20KB

          • memory/888-27-0x0000000001F60000-0x0000000001F70000-memory.dmp
            Filesize

            64KB

          • memory/888-24-0x0000000001F50000-0x0000000001F56000-memory.dmp
            Filesize

            24KB

          • memory/888-41-0x0000000001F60000-0x0000000001F70000-memory.dmp
            Filesize

            64KB

          • memory/888-43-0x0000000001F60000-0x0000000001F70000-memory.dmp
            Filesize

            64KB

          • memory/888-55-0x0000000002DD0000-0x0000000002DD7000-memory.dmp
            Filesize

            28KB

          • memory/888-33-0x0000000001F60000-0x0000000001F70000-memory.dmp
            Filesize

            64KB

          • memory/888-23-0x0000000002800000-0x0000000002A0F000-memory.dmp
            Filesize

            2.1MB

          • memory/888-51-0x0000000007780000-0x0000000007B8B000-memory.dmp
            Filesize

            4.0MB

          • memory/888-50-0x0000000001FF0000-0x0000000001FF5000-memory.dmp
            Filesize

            20KB

          • memory/888-46-0x0000000001F60000-0x0000000001F70000-memory.dmp
            Filesize

            64KB

          • memory/888-42-0x0000000001F60000-0x0000000001F70000-memory.dmp
            Filesize

            64KB

          • memory/888-40-0x0000000001F60000-0x0000000001F70000-memory.dmp
            Filesize

            64KB

          • memory/888-39-0x0000000001F60000-0x0000000001F70000-memory.dmp
            Filesize

            64KB

          • memory/888-38-0x0000000001F60000-0x0000000001F70000-memory.dmp
            Filesize

            64KB

          • memory/888-37-0x0000000001F60000-0x0000000001F70000-memory.dmp
            Filesize

            64KB

          • memory/888-34-0x0000000001F60000-0x0000000001F70000-memory.dmp
            Filesize

            64KB

          • memory/888-35-0x0000000001F60000-0x0000000001F70000-memory.dmp
            Filesize

            64KB

          • memory/2024-15-0x0000000000400000-0x000000000043F000-memory.dmp
            Filesize

            252KB

          • memory/2024-8-0x0000000000710000-0x0000000000810000-memory.dmp
            Filesize

            1024KB

          • memory/2024-9-0x0000000000590000-0x00000000005A3000-memory.dmp
            Filesize

            76KB

          • memory/2024-10-0x0000000000400000-0x000000000043F000-memory.dmp
            Filesize

            252KB

          • memory/2760-1-0x00000000006D0000-0x00000000007D0000-memory.dmp
            Filesize

            1024KB

          • memory/2760-4-0x0000000000400000-0x000000000043F000-memory.dmp
            Filesize

            252KB

          • memory/2760-16-0x0000000000400000-0x000000000043F000-memory.dmp
            Filesize

            252KB

          • memory/2760-2-0x00000000004C0000-0x00000000004D3000-memory.dmp
            Filesize

            76KB