Analysis

  • max time kernel
    147s
  • max time network
    159s
  • 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 14:14

General

  • Target

    aedba5939122af54e928bc355fbd3ffce10cc95f8d7efd007b8f9960d3c0cfe5.exe

  • Size

    256KB

  • MD5

    11d6fdab8ce0a4462699d12d8cc6e181

  • SHA1

    f79dd773636fb0c46346f08e9a36bea666e34350

  • SHA256

    aedba5939122af54e928bc355fbd3ffce10cc95f8d7efd007b8f9960d3c0cfe5

  • SHA512

    dd582a962bc9d3c50782a528a1c635d065530b96f7e1325d0c254f299b10b29218a8626b15f18b11aaf234b7393cea39d8025fa8d023fa9e79bdbdce2d6478a6

  • SSDEEP

    3072:DlrJL/wyRvNQG+FiOf5hqBNDo0Rpv01b8FbuW5hL4WeNH601:D3L/wUkFiOf5Ybon1gL4WeNa

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\aedba5939122af54e928bc355fbd3ffce10cc95f8d7efd007b8f9960d3c0cfe5.exe
    "C:\Users\Admin\AppData\Local\Temp\aedba5939122af54e928bc355fbd3ffce10cc95f8d7efd007b8f9960d3c0cfe5.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2648
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\dxiivkpa\
      2⤵
        PID:1656
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\bzowpfaw.exe" C:\Windows\SysWOW64\dxiivkpa\
        2⤵
          PID:4760
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create dxiivkpa binPath= "C:\Windows\SysWOW64\dxiivkpa\bzowpfaw.exe /d\"C:\Users\Admin\AppData\Local\Temp\aedba5939122af54e928bc355fbd3ffce10cc95f8d7efd007b8f9960d3c0cfe5.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1948
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description dxiivkpa "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4752
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start dxiivkpa
          2⤵
          • Launches sc.exe
          PID:3604
        • 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:3448
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2648 -s 652
          2⤵
          • Program crash
          PID:1108
      • C:\Windows\SysWOW64\dxiivkpa\bzowpfaw.exe
        C:\Windows\SysWOW64\dxiivkpa\bzowpfaw.exe /d"C:\Users\Admin\AppData\Local\Temp\aedba5939122af54e928bc355fbd3ffce10cc95f8d7efd007b8f9960d3c0cfe5.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:404
        • 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:1280
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 404 -s 532
          2⤵
          • Program crash
          PID:60
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 424 -p 2648 -ip 2648
        1⤵
          PID:3492
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 536 -p 404 -ip 404
          1⤵
            PID:1596

          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\bzowpfaw.exe
            Filesize

            12.2MB

            MD5

            e4de3fbdc269cf5b08c724bf928fd0bc

            SHA1

            3dbe1ad5027d231e0d16d2e03e673a85f6289089

            SHA256

            b971a7770a84bf24c7da5806adee97e7b3326c97c262fee0e5679f25ab60b9b1

            SHA512

            7e5bbd030c5146dd544e6f5a9119955f7b1260b8ca561da5421c794061120ca4f5d38e606ea69355e1dfb91f60b2afdf905ff5faed696201de98abe2986aad41

          • memory/404-13-0x0000000000400000-0x0000000000862000-memory.dmp
            Filesize

            4.4MB

          • memory/404-11-0x0000000000AF0000-0x0000000000BF0000-memory.dmp
            Filesize

            1024KB

          • memory/1280-32-0x0000000001DA0000-0x0000000001DB0000-memory.dmp
            Filesize

            64KB

          • memory/1280-42-0x0000000001DA0000-0x0000000001DB0000-memory.dmp
            Filesize

            64KB

          • memory/1280-58-0x0000000000A00000-0x0000000000A15000-memory.dmp
            Filesize

            84KB

          • memory/1280-34-0x0000000001DA0000-0x0000000001DB0000-memory.dmp
            Filesize

            64KB

          • memory/1280-10-0x0000000000A00000-0x0000000000A15000-memory.dmp
            Filesize

            84KB

          • memory/1280-35-0x0000000001DA0000-0x0000000001DB0000-memory.dmp
            Filesize

            64KB

          • memory/1280-15-0x0000000000A00000-0x0000000000A15000-memory.dmp
            Filesize

            84KB

          • memory/1280-16-0x0000000000A00000-0x0000000000A15000-memory.dmp
            Filesize

            84KB

          • memory/1280-19-0x0000000002600000-0x000000000280F000-memory.dmp
            Filesize

            2.1MB

          • memory/1280-22-0x0000000002600000-0x000000000280F000-memory.dmp
            Filesize

            2.1MB

          • memory/1280-23-0x0000000000BF0000-0x0000000000BF6000-memory.dmp
            Filesize

            24KB

          • memory/1280-26-0x0000000001DA0000-0x0000000001DB0000-memory.dmp
            Filesize

            64KB

          • memory/1280-30-0x0000000001DA0000-0x0000000001DB0000-memory.dmp
            Filesize

            64KB

          • memory/1280-29-0x0000000001DA0000-0x0000000001DB0000-memory.dmp
            Filesize

            64KB

          • memory/1280-31-0x0000000001DA0000-0x0000000001DB0000-memory.dmp
            Filesize

            64KB

          • memory/1280-33-0x0000000001DA0000-0x0000000001DB0000-memory.dmp
            Filesize

            64KB

          • memory/1280-54-0x0000000001DE0000-0x0000000001DE7000-memory.dmp
            Filesize

            28KB

          • memory/1280-53-0x0000000007880000-0x0000000007C8B000-memory.dmp
            Filesize

            4.0MB

          • memory/1280-50-0x0000000007880000-0x0000000007C8B000-memory.dmp
            Filesize

            4.0MB

          • memory/1280-36-0x0000000001DA0000-0x0000000001DB0000-memory.dmp
            Filesize

            64KB

          • memory/1280-37-0x0000000001DA0000-0x0000000001DB0000-memory.dmp
            Filesize

            64KB

          • memory/1280-38-0x0000000001DA0000-0x0000000001DB0000-memory.dmp
            Filesize

            64KB

          • memory/1280-39-0x0000000001DA0000-0x0000000001DB0000-memory.dmp
            Filesize

            64KB

          • memory/1280-40-0x0000000001DA0000-0x0000000001DB0000-memory.dmp
            Filesize

            64KB

          • memory/1280-41-0x0000000001DA0000-0x0000000001DB0000-memory.dmp
            Filesize

            64KB

          • memory/1280-49-0x0000000001DD0000-0x0000000001DD5000-memory.dmp
            Filesize

            20KB

          • memory/1280-43-0x0000000001DA0000-0x0000000001DB0000-memory.dmp
            Filesize

            64KB

          • memory/1280-45-0x0000000001DA0000-0x0000000001DB0000-memory.dmp
            Filesize

            64KB

          • memory/1280-44-0x0000000001DA0000-0x0000000001DB0000-memory.dmp
            Filesize

            64KB

          • memory/1280-46-0x0000000001DD0000-0x0000000001DD5000-memory.dmp
            Filesize

            20KB

          • memory/2648-8-0x0000000000400000-0x0000000000862000-memory.dmp
            Filesize

            4.4MB

          • memory/2648-2-0x0000000000AC0000-0x0000000000AD3000-memory.dmp
            Filesize

            76KB

          • memory/2648-4-0x0000000000400000-0x0000000000862000-memory.dmp
            Filesize

            4.4MB

          • memory/2648-1-0x0000000000B80000-0x0000000000C80000-memory.dmp
            Filesize

            1024KB

          • memory/2648-9-0x0000000000AC0000-0x0000000000AD3000-memory.dmp
            Filesize

            76KB