Analysis

  • max time kernel
    149s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240426-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
  • submitted
    15-05-2024 08:17

General

  • Target

    ddb7e1a9417893472e31106235b6e99d9da5b3c2813616fb2d7c4decc9f9e6da.exe

  • Size

    12.8MB

  • MD5

    17518f56ceacd77eacca522bc510b316

  • SHA1

    9c1011aa585e4072b179fd38866dc60a96233a8d

  • SHA256

    ddb7e1a9417893472e31106235b6e99d9da5b3c2813616fb2d7c4decc9f9e6da

  • SHA512

    be5ffd052fca16d01fdbc29f8d5b20487548bae723eb90560338064dd89bef2ee9e75d299683b245283c98de0dd986af54cfe8180cda058bac15d13fe62194ff

  • SSDEEP

    6144:9b1OA891BbPY8WckxrFFJeOC3Je7ozzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzf:9Jp+vbPY8W1xhFJeRJe7

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) 2 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\ddb7e1a9417893472e31106235b6e99d9da5b3c2813616fb2d7c4decc9f9e6da.exe
    "C:\Users\Admin\AppData\Local\Temp\ddb7e1a9417893472e31106235b6e99d9da5b3c2813616fb2d7c4decc9f9e6da.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2496
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\thdrlhao\
      2⤵
        PID:1996
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\nlvwyuxd.exe" C:\Windows\SysWOW64\thdrlhao\
        2⤵
          PID:1516
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create thdrlhao binPath= "C:\Windows\SysWOW64\thdrlhao\nlvwyuxd.exe /d\"C:\Users\Admin\AppData\Local\Temp\ddb7e1a9417893472e31106235b6e99d9da5b3c2813616fb2d7c4decc9f9e6da.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1860
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description thdrlhao "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1220
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start thdrlhao
          2⤵
          • Launches sc.exe
          PID:1804
        • 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:4964
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2496 -s 768
          2⤵
          • Program crash
          PID:1768
      • C:\Windows\SysWOW64\thdrlhao\nlvwyuxd.exe
        C:\Windows\SysWOW64\thdrlhao\nlvwyuxd.exe /d"C:\Users\Admin\AppData\Local\Temp\ddb7e1a9417893472e31106235b6e99d9da5b3c2813616fb2d7c4decc9f9e6da.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:736
        • 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:912
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 736 -s 516
          2⤵
          • Program crash
          PID:1216
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 2496 -ip 2496
        1⤵
          PID:5040
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 472 -p 736 -ip 736
          1⤵
            PID:4460

          Network

          MITRE ATT&CK Matrix ATT&CK v13

          Execution

          System Services

          1
          T1569

          Service Execution

          1
          T1569.002

          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\nlvwyuxd.exe
            Filesize

            14.4MB

            MD5

            6d20118bb10c5ba92cd29d880db2b875

            SHA1

            3543c990092527e881cdc7019813eaa09ddca24d

            SHA256

            0b36b3c2084065f658fa2b4b36ba64e112e5f5c0b272555c269dd1ebd6db10ed

            SHA512

            15f1926027e0bf75bcb721d0874622bb30ba3f80a0bc344be73ce255af3547ade84aaef7114d3355ef0ef68410d30a7f704f1ac6e43346471555ca6004669383

          • memory/736-11-0x0000000000400000-0x00000000007CA000-memory.dmp
            Filesize

            3.8MB

          • memory/736-15-0x0000000000400000-0x00000000007CA000-memory.dmp
            Filesize

            3.8MB

          • memory/736-16-0x0000000000400000-0x00000000007CA000-memory.dmp
            Filesize

            3.8MB

          • memory/912-46-0x00000000021A0000-0x00000000021B0000-memory.dmp
            Filesize

            64KB

          • memory/912-43-0x00000000021A0000-0x00000000021B0000-memory.dmp
            Filesize

            64KB

          • memory/912-24-0x0000000000FF0000-0x0000000000FF6000-memory.dmp
            Filesize

            24KB

          • memory/912-27-0x00000000021A0000-0x00000000021B0000-memory.dmp
            Filesize

            64KB

          • memory/912-14-0x0000000000BE0000-0x0000000000BF5000-memory.dmp
            Filesize

            84KB

          • memory/912-20-0x0000000002A00000-0x0000000002C0F000-memory.dmp
            Filesize

            2.1MB

          • memory/912-23-0x0000000002A00000-0x0000000002C0F000-memory.dmp
            Filesize

            2.1MB

          • memory/912-12-0x0000000000BE0000-0x0000000000BF5000-memory.dmp
            Filesize

            84KB

          • memory/912-17-0x0000000000BE0000-0x0000000000BF5000-memory.dmp
            Filesize

            84KB

          • memory/912-55-0x0000000002FD0000-0x0000000002FD7000-memory.dmp
            Filesize

            28KB

          • memory/912-54-0x0000000007A00000-0x0000000007E0B000-memory.dmp
            Filesize

            4.0MB

          • memory/912-51-0x0000000007A00000-0x0000000007E0B000-memory.dmp
            Filesize

            4.0MB

          • memory/912-50-0x00000000021F0000-0x00000000021F5000-memory.dmp
            Filesize

            20KB

          • memory/912-47-0x00000000021F0000-0x00000000021F5000-memory.dmp
            Filesize

            20KB

          • memory/912-30-0x00000000021A0000-0x00000000021B0000-memory.dmp
            Filesize

            64KB

          • memory/912-45-0x00000000021A0000-0x00000000021B0000-memory.dmp
            Filesize

            64KB

          • memory/912-44-0x00000000021A0000-0x00000000021B0000-memory.dmp
            Filesize

            64KB

          • memory/912-31-0x00000000021A0000-0x00000000021B0000-memory.dmp
            Filesize

            64KB

          • memory/912-42-0x00000000021A0000-0x00000000021B0000-memory.dmp
            Filesize

            64KB

          • memory/912-41-0x00000000021A0000-0x00000000021B0000-memory.dmp
            Filesize

            64KB

          • memory/912-40-0x00000000021A0000-0x00000000021B0000-memory.dmp
            Filesize

            64KB

          • memory/912-39-0x00000000021A0000-0x00000000021B0000-memory.dmp
            Filesize

            64KB

          • memory/912-38-0x00000000021A0000-0x00000000021B0000-memory.dmp
            Filesize

            64KB

          • memory/912-37-0x00000000021A0000-0x00000000021B0000-memory.dmp
            Filesize

            64KB

          • memory/912-36-0x00000000021A0000-0x00000000021B0000-memory.dmp
            Filesize

            64KB

          • memory/912-35-0x00000000021A0000-0x00000000021B0000-memory.dmp
            Filesize

            64KB

          • memory/912-34-0x00000000021A0000-0x00000000021B0000-memory.dmp
            Filesize

            64KB

          • memory/912-33-0x00000000021A0000-0x00000000021B0000-memory.dmp
            Filesize

            64KB

          • memory/912-32-0x00000000021A0000-0x00000000021B0000-memory.dmp
            Filesize

            64KB

          • memory/2496-8-0x0000000000860000-0x0000000000873000-memory.dmp
            Filesize

            76KB

          • memory/2496-1-0x0000000000890000-0x0000000000990000-memory.dmp
            Filesize

            1024KB

          • memory/2496-2-0x0000000000860000-0x0000000000873000-memory.dmp
            Filesize

            76KB

          • memory/2496-4-0x0000000000400000-0x0000000000415000-memory.dmp
            Filesize

            84KB

          • memory/2496-9-0x0000000000400000-0x0000000000415000-memory.dmp
            Filesize

            84KB

          • memory/2496-7-0x0000000000400000-0x00000000007CA000-memory.dmp
            Filesize

            3.8MB