Analysis

  • max time kernel
    161s
  • max time network
    179s
  • 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 14:50

General

  • Target

    b557b082890ce023270e4291073976f24d7e68b1ab58890bb95b310785142992.exe

  • Size

    229KB

  • MD5

    68502dbaf73be1eca888f78e3b06d55a

  • SHA1

    14654e87e085e07b91535c7e4e8bc5f41ced65e4

  • SHA256

    b557b082890ce023270e4291073976f24d7e68b1ab58890bb95b310785142992

  • SHA512

    d87cad3ac8f7f18cb12e63c9bb6a74f29dabf09d5374c64d51ce7a1b3621fd65e454ecf6ff0d0551b80685117b450abf50494b669ad48d5a9906b44e7364d6cb

  • SSDEEP

    3072:+nBlv1nZAbXsdUs0vEJier1K2x5b2CZ/P20DMb9rAn5M23R8Gj7mkg+cmH:+nBXk1fmK+G0DMb9rA6Gj7mkHco

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 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\b557b082890ce023270e4291073976f24d7e68b1ab58890bb95b310785142992.exe
    "C:\Users\Admin\AppData\Local\Temp\b557b082890ce023270e4291073976f24d7e68b1ab58890bb95b310785142992.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4080
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\eihhixbs\
      2⤵
        PID:4828
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\hovynbue.exe" C:\Windows\SysWOW64\eihhixbs\
        2⤵
          PID:2352
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create eihhixbs binPath= "C:\Windows\SysWOW64\eihhixbs\hovynbue.exe /d\"C:\Users\Admin\AppData\Local\Temp\b557b082890ce023270e4291073976f24d7e68b1ab58890bb95b310785142992.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2820
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description eihhixbs "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3068
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start eihhixbs
          2⤵
          • Launches sc.exe
          PID:432
        • 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:2064
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4080 -s 1040
          2⤵
          • Program crash
          PID:4032
      • C:\Windows\SysWOW64\eihhixbs\hovynbue.exe
        C:\Windows\SysWOW64\eihhixbs\hovynbue.exe /d"C:\Users\Admin\AppData\Local\Temp\b557b082890ce023270e4291073976f24d7e68b1ab58890bb95b310785142992.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3952
        • 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:4236
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3952 -s 548
          2⤵
          • Program crash
          PID:3596
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 4080 -ip 4080
        1⤵
          PID:1980
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 3952 -ip 3952
          1⤵
            PID:3208

          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\hovynbue.exe
            Filesize

            12.1MB

            MD5

            6a161cf86f67b62ea651f6161da87bbc

            SHA1

            ed2d48704633ca090fc925ac27168209082250eb

            SHA256

            343c0cf88aa6865b8906220bb668ed6e8a92f2356fae2357cc77e0b647cb6357

            SHA512

            83716ea54052780800dea3ff174db36f530ea6fdcbac5b837cf626da250c892ebb4614ab23231b225a50c6f9da413c25bc3cc81d3bd01f0f2ca0164056e4c446

          • memory/3952-15-0x0000000000400000-0x000000000043E000-memory.dmp
            Filesize

            248KB

          • memory/3952-8-0x0000000000450000-0x0000000000550000-memory.dmp
            Filesize

            1024KB

          • memory/3952-9-0x0000000000D00000-0x0000000000D13000-memory.dmp
            Filesize

            76KB

          • memory/3952-11-0x0000000000400000-0x000000000043E000-memory.dmp
            Filesize

            248KB

          • memory/4080-2-0x00000000005E0000-0x00000000005F3000-memory.dmp
            Filesize

            76KB

          • memory/4080-4-0x0000000000400000-0x000000000043E000-memory.dmp
            Filesize

            248KB

          • memory/4080-1-0x0000000000620000-0x0000000000720000-memory.dmp
            Filesize

            1024KB

          • memory/4080-16-0x0000000000400000-0x000000000043E000-memory.dmp
            Filesize

            248KB

          • memory/4236-33-0x0000000001D40000-0x0000000001D50000-memory.dmp
            Filesize

            64KB

          • memory/4236-36-0x0000000001D40000-0x0000000001D50000-memory.dmp
            Filesize

            64KB

          • memory/4236-17-0x0000000000770000-0x0000000000785000-memory.dmp
            Filesize

            84KB

          • memory/4236-18-0x0000000000770000-0x0000000000785000-memory.dmp
            Filesize

            84KB

          • memory/4236-20-0x0000000002600000-0x000000000280F000-memory.dmp
            Filesize

            2.1MB

          • memory/4236-23-0x0000000002600000-0x000000000280F000-memory.dmp
            Filesize

            2.1MB

          • memory/4236-24-0x0000000001D30000-0x0000000001D36000-memory.dmp
            Filesize

            24KB

          • memory/4236-27-0x0000000001D40000-0x0000000001D50000-memory.dmp
            Filesize

            64KB

          • memory/4236-30-0x0000000001D40000-0x0000000001D50000-memory.dmp
            Filesize

            64KB

          • memory/4236-31-0x0000000001D40000-0x0000000001D50000-memory.dmp
            Filesize

            64KB

          • memory/4236-32-0x0000000001D40000-0x0000000001D50000-memory.dmp
            Filesize

            64KB

          • memory/4236-10-0x0000000000770000-0x0000000000785000-memory.dmp
            Filesize

            84KB

          • memory/4236-34-0x0000000001D40000-0x0000000001D50000-memory.dmp
            Filesize

            64KB

          • memory/4236-35-0x0000000001D40000-0x0000000001D50000-memory.dmp
            Filesize

            64KB

          • memory/4236-37-0x0000000001D40000-0x0000000001D50000-memory.dmp
            Filesize

            64KB

          • memory/4236-14-0x0000000000770000-0x0000000000785000-memory.dmp
            Filesize

            84KB

          • memory/4236-38-0x0000000001D40000-0x0000000001D50000-memory.dmp
            Filesize

            64KB

          • memory/4236-40-0x0000000001D40000-0x0000000001D50000-memory.dmp
            Filesize

            64KB

          • memory/4236-39-0x0000000001D40000-0x0000000001D50000-memory.dmp
            Filesize

            64KB

          • memory/4236-41-0x0000000001D40000-0x0000000001D50000-memory.dmp
            Filesize

            64KB

          • memory/4236-43-0x0000000001D40000-0x0000000001D50000-memory.dmp
            Filesize

            64KB

          • memory/4236-42-0x0000000001D40000-0x0000000001D50000-memory.dmp
            Filesize

            64KB

          • memory/4236-44-0x0000000001D40000-0x0000000001D50000-memory.dmp
            Filesize

            64KB

          • memory/4236-45-0x0000000001D40000-0x0000000001D50000-memory.dmp
            Filesize

            64KB

          • memory/4236-46-0x0000000001D40000-0x0000000001D50000-memory.dmp
            Filesize

            64KB

          • memory/4236-47-0x0000000001DD0000-0x0000000001DD5000-memory.dmp
            Filesize

            20KB

          • memory/4236-50-0x0000000001DD0000-0x0000000001DD5000-memory.dmp
            Filesize

            20KB

          • memory/4236-51-0x0000000007580000-0x000000000798B000-memory.dmp
            Filesize

            4.0MB

          • memory/4236-54-0x0000000007580000-0x000000000798B000-memory.dmp
            Filesize

            4.0MB

          • memory/4236-55-0x0000000001DE0000-0x0000000001DE7000-memory.dmp
            Filesize

            28KB

          • memory/4236-59-0x0000000000770000-0x0000000000785000-memory.dmp
            Filesize

            84KB