Analysis

  • max time kernel
    149s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240412-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-x64system
  • submitted
    18-04-2024 19:32

General

  • Target

    1d4e2d006bff0bb6eb9cb7cf757b4003fd87386da931f844fede941868849749.exe

  • Size

    267KB

  • MD5

    6736700e3dfb47ac9beba3c2eff9e7ca

  • SHA1

    00d5f83f5bfd1bf889a0991882457db790c95c17

  • SHA256

    1d4e2d006bff0bb6eb9cb7cf757b4003fd87386da931f844fede941868849749

  • SHA512

    ffd04ada229530484d250ecba1c51b5175ac62dbdc872045c4b3426367c1545ee0eff9a90bba617d75f034d6e452e4a56ea753f7b0810b9268fefb41f55bdc5a

  • SSDEEP

    3072:7QOPm6aPQb9A3Hd1fWSol++S8/5QvstAj9gQ7HUjzNR4hT/ydzUtmMG/:Lm6aoiXd13olaesstABE4hCwtY/

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\1d4e2d006bff0bb6eb9cb7cf757b4003fd87386da931f844fede941868849749.exe
    "C:\Users\Admin\AppData\Local\Temp\1d4e2d006bff0bb6eb9cb7cf757b4003fd87386da931f844fede941868849749.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:456
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\esweuwox\
      2⤵
        PID:2044
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\cjivddlp.exe" C:\Windows\SysWOW64\esweuwox\
        2⤵
          PID:3652
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create esweuwox binPath= "C:\Windows\SysWOW64\esweuwox\cjivddlp.exe /d\"C:\Users\Admin\AppData\Local\Temp\1d4e2d006bff0bb6eb9cb7cf757b4003fd87386da931f844fede941868849749.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4396
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description esweuwox "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4816
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start esweuwox
          2⤵
          • Launches sc.exe
          PID:392
        • 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:1256
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 456 -s 1040
          2⤵
          • Program crash
          PID:208
      • C:\Windows\SysWOW64\esweuwox\cjivddlp.exe
        C:\Windows\SysWOW64\esweuwox\cjivddlp.exe /d"C:\Users\Admin\AppData\Local\Temp\1d4e2d006bff0bb6eb9cb7cf757b4003fd87386da931f844fede941868849749.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4848
        • 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:2252
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4848 -s 548
          2⤵
          • Program crash
          PID:820
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 456 -ip 456
        1⤵
          PID:2568
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 4848 -ip 4848
          1⤵
            PID:4592

          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\cjivddlp.exe
            Filesize

            11.2MB

            MD5

            85a26537dc6a4848770c52bb099fbc5e

            SHA1

            a4426ef4da7379d3e591a380ebab8082cc15ceaa

            SHA256

            6f0c1691a66a079adac657ab5e0e0110fcf1bea0fa42bb6fe6de13d04fa691dd

            SHA512

            9136cc7c3fff53965a186dccf4c74d8efa0b27ce6abbaa45f776212aa25899848dd0eae9b7c6270fad735e21322896c83c7836277674ddefa28bc622e78e4b17

          • memory/456-15-0x0000000000400000-0x0000000000547000-memory.dmp
            Filesize

            1.3MB

          • memory/456-3-0x0000000002150000-0x0000000002163000-memory.dmp
            Filesize

            76KB

          • memory/456-4-0x0000000000400000-0x0000000000547000-memory.dmp
            Filesize

            1.3MB

          • memory/456-1-0x0000000000550000-0x0000000000650000-memory.dmp
            Filesize

            1024KB

          • memory/2252-31-0x0000000002190000-0x00000000021A0000-memory.dmp
            Filesize

            64KB

          • memory/2252-35-0x0000000002190000-0x00000000021A0000-memory.dmp
            Filesize

            64KB

          • memory/2252-13-0x0000000000BD0000-0x0000000000BE5000-memory.dmp
            Filesize

            84KB

          • memory/2252-58-0x0000000000BD0000-0x0000000000BE5000-memory.dmp
            Filesize

            84KB

          • memory/2252-54-0x00000000035E0000-0x00000000035E7000-memory.dmp
            Filesize

            28KB

          • memory/2252-16-0x0000000000BD0000-0x0000000000BE5000-memory.dmp
            Filesize

            84KB

          • memory/2252-17-0x0000000000BD0000-0x0000000000BE5000-memory.dmp
            Filesize

            84KB

          • memory/2252-19-0x0000000002A00000-0x0000000002C0F000-memory.dmp
            Filesize

            2.1MB

          • memory/2252-22-0x0000000002A00000-0x0000000002C0F000-memory.dmp
            Filesize

            2.1MB

          • memory/2252-23-0x0000000002180000-0x0000000002186000-memory.dmp
            Filesize

            24KB

          • memory/2252-26-0x0000000002190000-0x00000000021A0000-memory.dmp
            Filesize

            64KB

          • memory/2252-29-0x0000000002190000-0x00000000021A0000-memory.dmp
            Filesize

            64KB

          • memory/2252-30-0x0000000002190000-0x00000000021A0000-memory.dmp
            Filesize

            64KB

          • memory/2252-53-0x0000000008140000-0x000000000854B000-memory.dmp
            Filesize

            4.0MB

          • memory/2252-32-0x0000000002190000-0x00000000021A0000-memory.dmp
            Filesize

            64KB

          • memory/2252-33-0x0000000002190000-0x00000000021A0000-memory.dmp
            Filesize

            64KB

          • memory/2252-34-0x0000000002190000-0x00000000021A0000-memory.dmp
            Filesize

            64KB

          • memory/2252-10-0x0000000000BD0000-0x0000000000BE5000-memory.dmp
            Filesize

            84KB

          • memory/2252-36-0x0000000002190000-0x00000000021A0000-memory.dmp
            Filesize

            64KB

          • memory/2252-37-0x0000000002190000-0x00000000021A0000-memory.dmp
            Filesize

            64KB

          • memory/2252-38-0x0000000002190000-0x00000000021A0000-memory.dmp
            Filesize

            64KB

          • memory/2252-39-0x0000000002190000-0x00000000021A0000-memory.dmp
            Filesize

            64KB

          • memory/2252-40-0x0000000002190000-0x00000000021A0000-memory.dmp
            Filesize

            64KB

          • memory/2252-41-0x0000000002190000-0x00000000021A0000-memory.dmp
            Filesize

            64KB

          • memory/2252-42-0x0000000002190000-0x00000000021A0000-memory.dmp
            Filesize

            64KB

          • memory/2252-43-0x0000000002190000-0x00000000021A0000-memory.dmp
            Filesize

            64KB

          • memory/2252-44-0x0000000002190000-0x00000000021A0000-memory.dmp
            Filesize

            64KB

          • memory/2252-45-0x0000000002190000-0x00000000021A0000-memory.dmp
            Filesize

            64KB

          • memory/2252-46-0x00000000031D0000-0x00000000031D5000-memory.dmp
            Filesize

            20KB

          • memory/2252-49-0x00000000031D0000-0x00000000031D5000-memory.dmp
            Filesize

            20KB

          • memory/2252-50-0x0000000008140000-0x000000000854B000-memory.dmp
            Filesize

            4.0MB

          • memory/4848-8-0x0000000000870000-0x0000000000970000-memory.dmp
            Filesize

            1024KB

          • memory/4848-9-0x0000000000400000-0x0000000000547000-memory.dmp
            Filesize

            1.3MB

          • memory/4848-14-0x0000000000400000-0x0000000000547000-memory.dmp
            Filesize

            1.3MB