Analysis

  • max time kernel
    147s
  • max time network
    150s
  • 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

    755b1b45c26d282f094d504074bbdf897f6460968db67dd7d88a4702e03ef7f9.exe

  • Size

    203KB

  • MD5

    d88f7c78b3be6c96c33b80a8e1bb85de

  • SHA1

    ce07fb26b0ec69cdf563f98560aa4f7f298e6e8d

  • SHA256

    755b1b45c26d282f094d504074bbdf897f6460968db67dd7d88a4702e03ef7f9

  • SHA512

    1c396a26da383d01ddc317bc4c565c5825b0e452bcf262ac849cd720acb6cb7abcc08e895041e59246dd7686e72424990728745716815a5879bce30769e3e898

  • SSDEEP

    3072:Ef3B/ALaZdXUNc8iirJiM21K7uSbrF068c0E0rBNWRDxlH+cmH:Ef32clVO598c0EHxQco

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\755b1b45c26d282f094d504074bbdf897f6460968db67dd7d88a4702e03ef7f9.exe
    "C:\Users\Admin\AppData\Local\Temp\755b1b45c26d282f094d504074bbdf897f6460968db67dd7d88a4702e03ef7f9.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3412
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\eywpzuur\
      2⤵
        PID:2472
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\lbbykwmk.exe" C:\Windows\SysWOW64\eywpzuur\
        2⤵
          PID:796
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create eywpzuur binPath= "C:\Windows\SysWOW64\eywpzuur\lbbykwmk.exe /d\"C:\Users\Admin\AppData\Local\Temp\755b1b45c26d282f094d504074bbdf897f6460968db67dd7d88a4702e03ef7f9.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3836
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description eywpzuur "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4664
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start eywpzuur
          2⤵
          • Launches sc.exe
          PID:4072
        • 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:4680
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3412 -s 1028
          2⤵
          • Program crash
          PID:4028
      • C:\Windows\SysWOW64\eywpzuur\lbbykwmk.exe
        C:\Windows\SysWOW64\eywpzuur\lbbykwmk.exe /d"C:\Users\Admin\AppData\Local\Temp\755b1b45c26d282f094d504074bbdf897f6460968db67dd7d88a4702e03ef7f9.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4896
        • 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:4024
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4896 -s 512
          2⤵
          • Program crash
          PID:1544
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 4896 -ip 4896
        1⤵
          PID:4864
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 540 -p 3412 -ip 3412
          1⤵
            PID:3892

          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\lbbykwmk.exe
            Filesize

            14.2MB

            MD5

            57488c03b455045ffacde79105d0dbe2

            SHA1

            a461b1611b091585a0346df9f6164c7f95bea842

            SHA256

            110e72d5aed2f82fd209efe4eeaaa6924495be4d25f4205a12e1fb28c57da494

            SHA512

            05b29405af14141776fb5f27d8c67b691ccdbfe4127e69d5346b5587e5f1321fc7a9604568d9256fcd5591585e0eca5d0d886bfe8ce6735e6be05560e12161b4

          • memory/3412-16-0x0000000000400000-0x0000000000438000-memory.dmp
            Filesize

            224KB

          • memory/3412-2-0x0000000000510000-0x0000000000523000-memory.dmp
            Filesize

            76KB

          • memory/3412-3-0x0000000000400000-0x0000000000438000-memory.dmp
            Filesize

            224KB

          • memory/3412-1-0x0000000000560000-0x0000000000660000-memory.dmp
            Filesize

            1024KB

          • memory/4024-50-0x00000000039F0000-0x00000000039F5000-memory.dmp
            Filesize

            20KB

          • memory/4024-44-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/4024-59-0x0000000001270000-0x0000000001285000-memory.dmp
            Filesize

            84KB

          • memory/4024-14-0x0000000001270000-0x0000000001285000-memory.dmp
            Filesize

            84KB

          • memory/4024-9-0x0000000001270000-0x0000000001285000-memory.dmp
            Filesize

            84KB

          • memory/4024-17-0x0000000001270000-0x0000000001285000-memory.dmp
            Filesize

            84KB

          • memory/4024-18-0x0000000001270000-0x0000000001285000-memory.dmp
            Filesize

            84KB

          • memory/4024-20-0x0000000002E00000-0x000000000300F000-memory.dmp
            Filesize

            2.1MB

          • memory/4024-23-0x0000000002E00000-0x000000000300F000-memory.dmp
            Filesize

            2.1MB

          • memory/4024-24-0x00000000025E0000-0x00000000025E6000-memory.dmp
            Filesize

            24KB

          • memory/4024-33-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/4024-32-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/4024-51-0x0000000008480000-0x000000000888B000-memory.dmp
            Filesize

            4.0MB

          • memory/4024-27-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/4024-47-0x00000000039F0000-0x00000000039F5000-memory.dmp
            Filesize

            20KB

          • memory/4024-46-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/4024-45-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/4024-30-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/4024-54-0x0000000008480000-0x000000000888B000-memory.dmp
            Filesize

            4.0MB

          • memory/4024-43-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/4024-55-0x00000000089D0000-0x00000000089D7000-memory.dmp
            Filesize

            28KB

          • memory/4024-42-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/4024-41-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/4024-40-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/4024-39-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/4024-38-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/4024-37-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/4024-36-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/4024-35-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/4024-34-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/4024-31-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/4896-11-0x0000000000400000-0x0000000000438000-memory.dmp
            Filesize

            224KB

          • memory/4896-8-0x0000000000610000-0x0000000000710000-memory.dmp
            Filesize

            1024KB

          • memory/4896-10-0x0000000000C00000-0x0000000000C13000-memory.dmp
            Filesize

            76KB