Analysis

  • max time kernel
    164s
  • max time network
    187s
  • 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 13:15

General

  • Target

    74d8ea75eaa0b08203bd607fc7b03b96ea3c45f5fda7d883d8587db4b85c1bed.exe

  • Size

    307KB

  • MD5

    3d4b04ef5fa77beaeef043f5a0fe5912

  • SHA1

    ad07caff0de5987592a648fbb9d4f240c088ac2a

  • SHA256

    74d8ea75eaa0b08203bd607fc7b03b96ea3c45f5fda7d883d8587db4b85c1bed

  • SHA512

    f6f3be5f5e78d4a97a96b8f1ed9d816000d063e3ec16e65ab3617cd86c28b68e0e4a5d5a835c36df731482541fe494b7d625d989adc7f176686d6178441ae959

  • SSDEEP

    3072:FIc+GjPykq8OdTpVbv+XeC6jRxK2s2mUn5wMT2UXdZ315U:mw7yFB1v7jjK3hMTFNhM

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\74d8ea75eaa0b08203bd607fc7b03b96ea3c45f5fda7d883d8587db4b85c1bed.exe
    "C:\Users\Admin\AppData\Local\Temp\74d8ea75eaa0b08203bd607fc7b03b96ea3c45f5fda7d883d8587db4b85c1bed.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4812
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\keangcwb\
      2⤵
        PID:1768
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\xedqyygk.exe" C:\Windows\SysWOW64\keangcwb\
        2⤵
          PID:2348
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create keangcwb binPath= "C:\Windows\SysWOW64\keangcwb\xedqyygk.exe /d\"C:\Users\Admin\AppData\Local\Temp\74d8ea75eaa0b08203bd607fc7b03b96ea3c45f5fda7d883d8587db4b85c1bed.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:400
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description keangcwb "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3436
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start keangcwb
          2⤵
          • Launches sc.exe
          PID:3424
        • 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:2496
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4812 -s 1052
          2⤵
          • Program crash
          PID:3796
      • C:\Windows\SysWOW64\keangcwb\xedqyygk.exe
        C:\Windows\SysWOW64\keangcwb\xedqyygk.exe /d"C:\Users\Admin\AppData\Local\Temp\74d8ea75eaa0b08203bd607fc7b03b96ea3c45f5fda7d883d8587db4b85c1bed.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2632
        • 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:1296
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2632 -s 548
          2⤵
          • Program crash
          PID:2676
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 484 -p 4812 -ip 4812
        1⤵
          PID:3152
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 476 -p 2632 -ip 2632
          1⤵
            PID:1088

          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\xedqyygk.exe
            Filesize

            11.5MB

            MD5

            bb36b657e5697de853951f3a2848662e

            SHA1

            7303d15b6e04bcbb8c40737a4eec34cb22186f9d

            SHA256

            7fb0e97d16c481af6345225fd660f6b89f56ed5c74cfca3df9f205ed2cdbff84

            SHA512

            a99dee013c09171ac91ef33870ac4171b132611c91e1cbe35f5180efac9cd41d28fc62b324b82def47e6b6245ace603951c6fe37a34a600690bf2947e1c552eb

          • memory/1296-35-0x0000000002370000-0x0000000002380000-memory.dmp
            Filesize

            64KB

          • memory/1296-49-0x00000000031D0000-0x00000000031D5000-memory.dmp
            Filesize

            20KB

          • memory/1296-61-0x0000000000DB0000-0x0000000000DC5000-memory.dmp
            Filesize

            84KB

          • memory/1296-34-0x0000000002370000-0x0000000002380000-memory.dmp
            Filesize

            64KB

          • memory/1296-56-0x0000000007B80000-0x0000000007F8B000-memory.dmp
            Filesize

            4.0MB

          • memory/1296-53-0x0000000007B80000-0x0000000007F8B000-memory.dmp
            Filesize

            4.0MB

          • memory/1296-12-0x0000000000DB0000-0x0000000000DC5000-memory.dmp
            Filesize

            84KB

          • memory/1296-52-0x00000000031D0000-0x00000000031D5000-memory.dmp
            Filesize

            20KB

          • memory/1296-48-0x0000000002370000-0x0000000002380000-memory.dmp
            Filesize

            64KB

          • memory/1296-18-0x0000000000DB0000-0x0000000000DC5000-memory.dmp
            Filesize

            84KB

          • memory/1296-19-0x0000000000DB0000-0x0000000000DC5000-memory.dmp
            Filesize

            84KB

          • memory/1296-20-0x0000000000DB0000-0x0000000000DC5000-memory.dmp
            Filesize

            84KB

          • memory/1296-22-0x0000000002C00000-0x0000000002E0F000-memory.dmp
            Filesize

            2.1MB

          • memory/1296-36-0x0000000002370000-0x0000000002380000-memory.dmp
            Filesize

            64KB

          • memory/1296-26-0x0000000002360000-0x0000000002366000-memory.dmp
            Filesize

            24KB

          • memory/1296-29-0x0000000002370000-0x0000000002380000-memory.dmp
            Filesize

            64KB

          • memory/1296-32-0x0000000002370000-0x0000000002380000-memory.dmp
            Filesize

            64KB

          • memory/1296-33-0x0000000002370000-0x0000000002380000-memory.dmp
            Filesize

            64KB

          • memory/1296-57-0x00000000031E0000-0x00000000031E7000-memory.dmp
            Filesize

            28KB

          • memory/1296-47-0x0000000002370000-0x0000000002380000-memory.dmp
            Filesize

            64KB

          • memory/1296-25-0x0000000002C00000-0x0000000002E0F000-memory.dmp
            Filesize

            2.1MB

          • memory/1296-37-0x0000000002370000-0x0000000002380000-memory.dmp
            Filesize

            64KB

          • memory/1296-38-0x0000000002370000-0x0000000002380000-memory.dmp
            Filesize

            64KB

          • memory/1296-39-0x0000000002370000-0x0000000002380000-memory.dmp
            Filesize

            64KB

          • memory/1296-40-0x0000000002370000-0x0000000002380000-memory.dmp
            Filesize

            64KB

          • memory/1296-41-0x0000000002370000-0x0000000002380000-memory.dmp
            Filesize

            64KB

          • memory/1296-43-0x0000000002370000-0x0000000002380000-memory.dmp
            Filesize

            64KB

          • memory/1296-42-0x0000000002370000-0x0000000002380000-memory.dmp
            Filesize

            64KB

          • memory/1296-44-0x0000000002370000-0x0000000002380000-memory.dmp
            Filesize

            64KB

          • memory/1296-45-0x0000000002370000-0x0000000002380000-memory.dmp
            Filesize

            64KB

          • memory/1296-46-0x0000000002370000-0x0000000002380000-memory.dmp
            Filesize

            64KB

          • memory/2632-17-0x0000000000400000-0x0000000002AC3000-memory.dmp
            Filesize

            38.8MB

          • memory/2632-13-0x0000000002B50000-0x0000000002B63000-memory.dmp
            Filesize

            76KB

          • memory/2632-11-0x0000000002B90000-0x0000000002C90000-memory.dmp
            Filesize

            1024KB

          • memory/4812-4-0x0000000000400000-0x0000000002AC3000-memory.dmp
            Filesize

            38.8MB

          • memory/4812-1-0x0000000002D50000-0x0000000002E50000-memory.dmp
            Filesize

            1024KB

          • memory/4812-9-0x0000000000400000-0x0000000002AC3000-memory.dmp
            Filesize

            38.8MB

          • memory/4812-6-0x0000000000400000-0x0000000002AC3000-memory.dmp
            Filesize

            38.8MB

          • memory/4812-2-0x0000000002C70000-0x0000000002C83000-memory.dmp
            Filesize

            76KB