Analysis

  • max time kernel
    146s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    10-05-2024 05:20

General

  • Target

    56c810d00957ea3eb8a5bc59ee7d5e04dde7c323131db0afff103c9830ae3bfd.exe

  • Size

    11.3MB

  • MD5

    aaac609f177376eeb5f5ce8c5320e85e

  • SHA1

    761a2bb1419572c47bf4d73a3f62b6b99059c043

  • SHA256

    56c810d00957ea3eb8a5bc59ee7d5e04dde7c323131db0afff103c9830ae3bfd

  • SHA512

    e15de40efac541439fce9e517b8377110c85c03df126f3b3e188eafbe9984acebc6dc9bdac9870870b89a43546e7ea99a9ed7af9c7ff21fadc8759cf4d8063ee

  • SSDEEP

    6144:qILpF81vOj1GcYGW5DSTLQaYpR/MUDoS:j84GcYGiDSLsoS

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) 2 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
  • UPX packed file 3 IoCs

    Detects executables packed with UPX/modified UPX open source packer.

  • 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 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\56c810d00957ea3eb8a5bc59ee7d5e04dde7c323131db0afff103c9830ae3bfd.exe
    "C:\Users\Admin\AppData\Local\Temp\56c810d00957ea3eb8a5bc59ee7d5e04dde7c323131db0afff103c9830ae3bfd.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:884
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\enrbtsuc\
      2⤵
        PID:5040
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\qzfqodv.exe" C:\Windows\SysWOW64\enrbtsuc\
        2⤵
          PID:4652
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create enrbtsuc binPath= "C:\Windows\SysWOW64\enrbtsuc\qzfqodv.exe /d\"C:\Users\Admin\AppData\Local\Temp\56c810d00957ea3eb8a5bc59ee7d5e04dde7c323131db0afff103c9830ae3bfd.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:768
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description enrbtsuc "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2832
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start enrbtsuc
          2⤵
          • Launches sc.exe
          PID:2836
        • 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:2752
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 884 -s 784
          2⤵
          • Program crash
          PID:4960
      • C:\Windows\SysWOW64\enrbtsuc\qzfqodv.exe
        C:\Windows\SysWOW64\enrbtsuc\qzfqodv.exe /d"C:\Users\Admin\AppData\Local\Temp\56c810d00957ea3eb8a5bc59ee7d5e04dde7c323131db0afff103c9830ae3bfd.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2528
        • 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:2400
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2528 -s 524
          2⤵
          • Program crash
          PID:428
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 884 -ip 884
        1⤵
          PID:412
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 484 -p 2528 -ip 2528
          1⤵
            PID:4824

          Network

          MITRE ATT&CK Matrix ATT&CK v13

          Execution

          System Services

          1
          T1569

          Service Execution

          1
          T1569.002

          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\qzfqodv.exe
            Filesize

            11.2MB

            MD5

            30a7d16ef1354e04f21fbb5a5f53dedc

            SHA1

            ff3080154d86e8b1c48fc01c17ed7b3865b6929c

            SHA256

            3fe5ef46bb3c995f7c28108404b8b0ec32eb4bf1af0aeee85c9077e374be79b1

            SHA512

            3ec7377187ba367aeba30f96aa1525af06bbb484cbf747a4f9e21c2e6333453b14ce01c561df5921757a7456af8b188b239481783e7213a2a97ffca128164adc

          • memory/884-11-0x0000000000950000-0x0000000000963000-memory.dmp
            Filesize

            76KB

          • memory/884-2-0x0000000000B90000-0x0000000000C90000-memory.dmp
            Filesize

            1024KB

          • memory/884-3-0x0000000000950000-0x0000000000963000-memory.dmp
            Filesize

            76KB

          • memory/884-4-0x0000000000400000-0x0000000000415000-memory.dmp
            Filesize

            84KB

          • memory/884-0-0x0000000000400000-0x00000000007F2000-memory.dmp
            Filesize

            3.9MB

          • memory/884-10-0x0000000000400000-0x00000000007F2000-memory.dmp
            Filesize

            3.9MB

          • memory/884-12-0x0000000000400000-0x0000000000415000-memory.dmp
            Filesize

            84KB

          • memory/2400-40-0x00000000009E0000-0x00000000009F0000-memory.dmp
            Filesize

            64KB

          • memory/2400-45-0x00000000009E0000-0x00000000009F0000-memory.dmp
            Filesize

            64KB

          • memory/2400-24-0x0000000002200000-0x000000000240F000-memory.dmp
            Filesize

            2.1MB

          • memory/2400-26-0x0000000002200000-0x000000000240F000-memory.dmp
            Filesize

            2.1MB

          • memory/2400-18-0x00000000003B0000-0x00000000003C5000-memory.dmp
            Filesize

            84KB

          • memory/2400-16-0x00000000003B0000-0x00000000003C5000-memory.dmp
            Filesize

            84KB

          • memory/2400-21-0x00000000003B0000-0x00000000003C5000-memory.dmp
            Filesize

            84KB

          • memory/2400-44-0x00000000009E0000-0x00000000009F0000-memory.dmp
            Filesize

            64KB

          • memory/2400-58-0x00000000019E0000-0x00000000019E7000-memory.dmp
            Filesize

            28KB

          • memory/2400-57-0x0000000007200000-0x000000000760B000-memory.dmp
            Filesize

            4.0MB

          • memory/2400-54-0x0000000007200000-0x000000000760B000-memory.dmp
            Filesize

            4.0MB

          • memory/2400-53-0x00000000009F0000-0x00000000009F5000-memory.dmp
            Filesize

            20KB

          • memory/2400-50-0x00000000009F0000-0x00000000009F5000-memory.dmp
            Filesize

            20KB

          • memory/2400-49-0x00000000009E0000-0x00000000009F0000-memory.dmp
            Filesize

            64KB

          • memory/2400-48-0x00000000009E0000-0x00000000009F0000-memory.dmp
            Filesize

            64KB

          • memory/2400-47-0x00000000009E0000-0x00000000009F0000-memory.dmp
            Filesize

            64KB

          • memory/2400-46-0x00000000009E0000-0x00000000009F0000-memory.dmp
            Filesize

            64KB

          • memory/2400-27-0x00000000009D0000-0x00000000009D6000-memory.dmp
            Filesize

            24KB

          • memory/2400-43-0x00000000009E0000-0x00000000009F0000-memory.dmp
            Filesize

            64KB

          • memory/2400-42-0x00000000009E0000-0x00000000009F0000-memory.dmp
            Filesize

            64KB

          • memory/2400-41-0x00000000009E0000-0x00000000009F0000-memory.dmp
            Filesize

            64KB

          • memory/2400-39-0x00000000009E0000-0x00000000009F0000-memory.dmp
            Filesize

            64KB

          • memory/2400-30-0x00000000009E0000-0x00000000009F0000-memory.dmp
            Filesize

            64KB

          • memory/2400-38-0x00000000009E0000-0x00000000009F0000-memory.dmp
            Filesize

            64KB

          • memory/2400-37-0x00000000009E0000-0x00000000009F0000-memory.dmp
            Filesize

            64KB

          • memory/2400-36-0x00000000009E0000-0x00000000009F0000-memory.dmp
            Filesize

            64KB

          • memory/2400-35-0x00000000009E0000-0x00000000009F0000-memory.dmp
            Filesize

            64KB

          • memory/2400-34-0x00000000009E0000-0x00000000009F0000-memory.dmp
            Filesize

            64KB

          • memory/2400-33-0x00000000009E0000-0x00000000009F0000-memory.dmp
            Filesize

            64KB

          • memory/2528-8-0x0000000000400000-0x00000000007F2000-memory.dmp
            Filesize

            3.9MB

          • memory/2528-14-0x0000000000400000-0x00000000007F2000-memory.dmp
            Filesize

            3.9MB

          • memory/2528-19-0x0000000000400000-0x00000000007F2000-memory.dmp
            Filesize

            3.9MB

          • memory/2528-15-0x0000000000400000-0x00000000007F2000-memory.dmp
            Filesize

            3.9MB