Analysis

  • max time kernel
    144s
  • max time network
    151s
  • 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

    4da2cf296ff1402fe8a6e0bdbfb00a06008b8ba5a3825b42f4f75ef2101c8ce4.exe

  • Size

    203KB

  • MD5

    6a029324fa243a4b1cad4a6bbcc2e9a3

  • SHA1

    8187f39aaa95e89707c479db4115b4679110547c

  • SHA256

    4da2cf296ff1402fe8a6e0bdbfb00a06008b8ba5a3825b42f4f75ef2101c8ce4

  • SHA512

    ae92eb275eb0e7b44a1baf80233cc7ccb8ed3d94ad7833ea1de8b040bf4917a1a7de6f952dae0ced3fc307919c20e6748561bbe6eecc771d79f0540f4934fcdf

  • SSDEEP

    3072:FJ9RtZYNXsdUsBGQJiE/1KWvEDAKPeubjLzkYd+IrVXsfR80B+cmH:3bUVu7KPeuvJUAV95co

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\4da2cf296ff1402fe8a6e0bdbfb00a06008b8ba5a3825b42f4f75ef2101c8ce4.exe
    "C:\Users\Admin\AppData\Local\Temp\4da2cf296ff1402fe8a6e0bdbfb00a06008b8ba5a3825b42f4f75ef2101c8ce4.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2076
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\pcmybgpi\
      2⤵
        PID:4884
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\nhhzcmqc.exe" C:\Windows\SysWOW64\pcmybgpi\
        2⤵
          PID:4436
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create pcmybgpi binPath= "C:\Windows\SysWOW64\pcmybgpi\nhhzcmqc.exe /d\"C:\Users\Admin\AppData\Local\Temp\4da2cf296ff1402fe8a6e0bdbfb00a06008b8ba5a3825b42f4f75ef2101c8ce4.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3968
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description pcmybgpi "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4644
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start pcmybgpi
          2⤵
          • Launches sc.exe
          PID:4408
        • 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:1204
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2076 -s 1208
          2⤵
          • Program crash
          PID:5076
      • C:\Windows\SysWOW64\pcmybgpi\nhhzcmqc.exe
        C:\Windows\SysWOW64\pcmybgpi\nhhzcmqc.exe /d"C:\Users\Admin\AppData\Local\Temp\4da2cf296ff1402fe8a6e0bdbfb00a06008b8ba5a3825b42f4f75ef2101c8ce4.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2832
        • 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:544
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2832 -s 520
          2⤵
          • Program crash
          PID:2528
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 2832 -ip 2832
        1⤵
          PID:3688
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 472 -p 2076 -ip 2076
          1⤵
            PID:1776

          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\nhhzcmqc.exe
            Filesize

            13.4MB

            MD5

            be2da2a52bc0057955096622d178a6b8

            SHA1

            4a4c3e688f97529863c5a34f5e2b012a15e83046

            SHA256

            fb0d2e87a5e69cfd3b1f0d20821e90e86e084cc15578983fa57778058e11377f

            SHA512

            cc2251389ab33b360664153c454130efc53a4831beec279c2030dca34edf57f333772208ef1345c521dbde2f88f09d9141bf3aaacd405bd2a6a699e17b60b38e

          • memory/544-43-0x00000000025E0000-0x00000000025F0000-memory.dmp
            Filesize

            64KB

          • memory/544-35-0x00000000025E0000-0x00000000025F0000-memory.dmp
            Filesize

            64KB

          • memory/544-59-0x0000000001220000-0x0000000001235000-memory.dmp
            Filesize

            84KB

          • memory/544-8-0x0000000001220000-0x0000000001235000-memory.dmp
            Filesize

            84KB

          • memory/544-33-0x00000000025E0000-0x00000000025F0000-memory.dmp
            Filesize

            64KB

          • memory/544-36-0x00000000025E0000-0x00000000025F0000-memory.dmp
            Filesize

            64KB

          • memory/544-37-0x00000000025E0000-0x00000000025F0000-memory.dmp
            Filesize

            64KB

          • memory/544-14-0x0000000001220000-0x0000000001235000-memory.dmp
            Filesize

            84KB

          • memory/544-34-0x00000000025E0000-0x00000000025F0000-memory.dmp
            Filesize

            64KB

          • memory/544-17-0x0000000001220000-0x0000000001235000-memory.dmp
            Filesize

            84KB

          • memory/544-18-0x0000000001220000-0x0000000001235000-memory.dmp
            Filesize

            84KB

          • memory/544-20-0x0000000002E00000-0x000000000300F000-memory.dmp
            Filesize

            2.1MB

          • memory/544-23-0x0000000002E00000-0x000000000300F000-memory.dmp
            Filesize

            2.1MB

          • memory/544-24-0x00000000013F0000-0x00000000013F6000-memory.dmp
            Filesize

            24KB

          • memory/544-27-0x00000000025E0000-0x00000000025F0000-memory.dmp
            Filesize

            64KB

          • memory/544-30-0x00000000025E0000-0x00000000025F0000-memory.dmp
            Filesize

            64KB

          • memory/544-32-0x00000000025E0000-0x00000000025F0000-memory.dmp
            Filesize

            64KB

          • memory/544-31-0x00000000025E0000-0x00000000025F0000-memory.dmp
            Filesize

            64KB

          • memory/544-38-0x00000000025E0000-0x00000000025F0000-memory.dmp
            Filesize

            64KB

          • memory/544-55-0x00000000033D0000-0x00000000033D7000-memory.dmp
            Filesize

            28KB

          • memory/544-44-0x00000000025E0000-0x00000000025F0000-memory.dmp
            Filesize

            64KB

          • memory/544-51-0x0000000007E00000-0x000000000820B000-memory.dmp
            Filesize

            4.0MB

          • memory/544-50-0x00000000025F0000-0x00000000025F5000-memory.dmp
            Filesize

            20KB

          • memory/544-47-0x00000000025F0000-0x00000000025F5000-memory.dmp
            Filesize

            20KB

          • memory/544-46-0x00000000025E0000-0x00000000025F0000-memory.dmp
            Filesize

            64KB

          • memory/544-45-0x00000000025E0000-0x00000000025F0000-memory.dmp
            Filesize

            64KB

          • memory/544-39-0x00000000025E0000-0x00000000025F0000-memory.dmp
            Filesize

            64KB

          • memory/544-42-0x00000000025E0000-0x00000000025F0000-memory.dmp
            Filesize

            64KB

          • memory/544-41-0x00000000025E0000-0x00000000025F0000-memory.dmp
            Filesize

            64KB

          • memory/544-54-0x0000000007E00000-0x000000000820B000-memory.dmp
            Filesize

            4.0MB

          • memory/544-40-0x00000000025E0000-0x00000000025F0000-memory.dmp
            Filesize

            64KB

          • memory/2076-1-0x00000000004D0000-0x00000000005D0000-memory.dmp
            Filesize

            1024KB

          • memory/2076-4-0x0000000000400000-0x0000000000437000-memory.dmp
            Filesize

            220KB

          • memory/2076-15-0x0000000000400000-0x0000000000437000-memory.dmp
            Filesize

            220KB

          • memory/2076-2-0x0000000002040000-0x0000000002053000-memory.dmp
            Filesize

            76KB

          • memory/2832-12-0x0000000000400000-0x0000000000437000-memory.dmp
            Filesize

            220KB

          • memory/2832-10-0x00000000004D0000-0x00000000004E3000-memory.dmp
            Filesize

            76KB

          • memory/2832-9-0x0000000000520000-0x0000000000620000-memory.dmp
            Filesize

            1024KB