Analysis

  • max time kernel
    149s
  • max time network
    154s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240426-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
  • submitted
    10-05-2024 05:20

General

  • Target

    f00b17829026124838d62c5d1f920a720476547d5e8309c5027614d29a416e05.exe

  • Size

    10.5MB

  • MD5

    400992e89f640ced83313c8d0cec106e

  • SHA1

    abcc1616d181034b37b6e2aee2b274a4b241ed7f

  • SHA256

    f00b17829026124838d62c5d1f920a720476547d5e8309c5027614d29a416e05

  • SHA512

    8ef86fc13c10e0867111159265d0f6e3a011e35aa07b51aa94b6a52bf80272fff5a0339e3dea13e9c87a0c3f319d87014326256372dfb27bd2c74d58d7e42e15

  • SSDEEP

    12288:xucqxGrf50Fqwswswswswswswswswswswswswswswswswswswswswswswswswswv:xuM6F

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
  • 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\f00b17829026124838d62c5d1f920a720476547d5e8309c5027614d29a416e05.exe
    "C:\Users\Admin\AppData\Local\Temp\f00b17829026124838d62c5d1f920a720476547d5e8309c5027614d29a416e05.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3088
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\avibvxwu\
      2⤵
        PID:2040
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\getbukfb.exe" C:\Windows\SysWOW64\avibvxwu\
        2⤵
          PID:4520
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create avibvxwu binPath= "C:\Windows\SysWOW64\avibvxwu\getbukfb.exe /d\"C:\Users\Admin\AppData\Local\Temp\f00b17829026124838d62c5d1f920a720476547d5e8309c5027614d29a416e05.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2044
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description avibvxwu "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4768
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start avibvxwu
          2⤵
          • Launches sc.exe
          PID:5076
        • 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:2220
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3088 -s 656
          2⤵
          • Program crash
          PID:832
      • C:\Windows\SysWOW64\avibvxwu\getbukfb.exe
        C:\Windows\SysWOW64\avibvxwu\getbukfb.exe /d"C:\Users\Admin\AppData\Local\Temp\f00b17829026124838d62c5d1f920a720476547d5e8309c5027614d29a416e05.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2828
        • 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:408
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2828 -s 508
          2⤵
          • Program crash
          PID:3988
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 3088 -ip 3088
        1⤵
          PID:3928
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 2828 -ip 2828
          1⤵
            PID:1688

          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\getbukfb.exe
            Filesize

            14.6MB

            MD5

            ed3adc023002af7d984b12757995835a

            SHA1

            93f2ad1a849238aeee21186528a937c0dec5537a

            SHA256

            0617ccf14e1725c3dfb352276c6123adbfbfa6b1460a4acbf65ca328670c6322

            SHA512

            65569f0d51bd96b492e68983320c4d7aa34ed6c7e09d88db693cbba21087dab29bf575879182065480e5d2a541f2f32ccd20489329a2b50a8d2412ac5b62f517

          • memory/408-43-0x0000000001FB0000-0x0000000001FC0000-memory.dmp
            Filesize

            64KB

          • memory/408-8-0x0000000000C00000-0x0000000000C15000-memory.dmp
            Filesize

            84KB

          • memory/408-44-0x0000000002DD0000-0x0000000002DD5000-memory.dmp
            Filesize

            20KB

          • memory/408-20-0x0000000002800000-0x0000000002A0F000-memory.dmp
            Filesize

            2.1MB

          • memory/408-24-0x0000000001FB0000-0x0000000001FC0000-memory.dmp
            Filesize

            64KB

          • memory/408-27-0x0000000001FB0000-0x0000000001FC0000-memory.dmp
            Filesize

            64KB

          • memory/408-28-0x0000000001FB0000-0x0000000001FC0000-memory.dmp
            Filesize

            64KB

          • memory/408-29-0x0000000001FB0000-0x0000000001FC0000-memory.dmp
            Filesize

            64KB

          • memory/408-14-0x0000000000C00000-0x0000000000C15000-memory.dmp
            Filesize

            84KB

          • memory/408-15-0x0000000000C00000-0x0000000000C15000-memory.dmp
            Filesize

            84KB

          • memory/408-17-0x0000000002800000-0x0000000002A0F000-memory.dmp
            Filesize

            2.1MB

          • memory/408-52-0x0000000002DE0000-0x0000000002DE7000-memory.dmp
            Filesize

            28KB

          • memory/408-21-0x0000000001FA0000-0x0000000001FA6000-memory.dmp
            Filesize

            24KB

          • memory/408-48-0x0000000007800000-0x0000000007C0B000-memory.dmp
            Filesize

            4.0MB

          • memory/408-51-0x0000000007800000-0x0000000007C0B000-memory.dmp
            Filesize

            4.0MB

          • memory/408-47-0x0000000002DD0000-0x0000000002DD5000-memory.dmp
            Filesize

            20KB

          • memory/408-30-0x0000000001FB0000-0x0000000001FC0000-memory.dmp
            Filesize

            64KB

          • memory/408-42-0x0000000001FB0000-0x0000000001FC0000-memory.dmp
            Filesize

            64KB

          • memory/408-31-0x0000000001FB0000-0x0000000001FC0000-memory.dmp
            Filesize

            64KB

          • memory/408-41-0x0000000001FB0000-0x0000000001FC0000-memory.dmp
            Filesize

            64KB

          • memory/408-40-0x0000000001FB0000-0x0000000001FC0000-memory.dmp
            Filesize

            64KB

          • memory/408-39-0x0000000001FB0000-0x0000000001FC0000-memory.dmp
            Filesize

            64KB

          • memory/408-38-0x0000000001FB0000-0x0000000001FC0000-memory.dmp
            Filesize

            64KB

          • memory/408-37-0x0000000001FB0000-0x0000000001FC0000-memory.dmp
            Filesize

            64KB

          • memory/408-36-0x0000000001FB0000-0x0000000001FC0000-memory.dmp
            Filesize

            64KB

          • memory/408-35-0x0000000001FB0000-0x0000000001FC0000-memory.dmp
            Filesize

            64KB

          • memory/408-34-0x0000000001FB0000-0x0000000001FC0000-memory.dmp
            Filesize

            64KB

          • memory/408-33-0x0000000001FB0000-0x0000000001FC0000-memory.dmp
            Filesize

            64KB

          • memory/408-32-0x0000000001FB0000-0x0000000001FC0000-memory.dmp
            Filesize

            64KB

          • memory/2828-13-0x0000000000400000-0x0000000002B6C000-memory.dmp
            Filesize

            39.4MB

          • memory/3088-4-0x0000000000400000-0x0000000000415000-memory.dmp
            Filesize

            84KB

          • memory/3088-2-0x0000000004770000-0x0000000004783000-memory.dmp
            Filesize

            76KB

          • memory/3088-10-0x0000000000400000-0x0000000002B6C000-memory.dmp
            Filesize

            39.4MB

          • memory/3088-11-0x0000000004770000-0x0000000004783000-memory.dmp
            Filesize

            76KB

          • memory/3088-12-0x0000000000400000-0x0000000000415000-memory.dmp
            Filesize

            84KB

          • memory/3088-1-0x0000000002CC0000-0x0000000002DC0000-memory.dmp
            Filesize

            1024KB