Analysis

  • max time kernel
    146s
  • max time network
    153s
  • 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 13:34

General

  • Target

    c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe

  • Size

    233KB

  • MD5

    9f72ad79bba9d398a150be4b676c624b

  • SHA1

    f06218c9fb624ba6a8040846c1a888e6dacc6fb6

  • SHA256

    c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981

  • SHA512

    bd7a919b1773115756c1b795fc3111132f7acd8290e2d82c25e6b6d03510bc61f7736c3b1fee2794bd3492e103121018d83565d2dea79287481b99f31bdbb393

  • SSDEEP

    3072:1oCTZcw8fGJiR21K9Np5Y4xL1JTp0C2bhUQiGkRo8DegwT:1ob/vFF2bhd8l

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\c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe
    "C:\Users\Admin\AppData\Local\Temp\c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:6016
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\clmomiot\
      2⤵
        PID:1928
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\brroamca.exe" C:\Windows\SysWOW64\clmomiot\
        2⤵
          PID:388
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create clmomiot binPath= "C:\Windows\SysWOW64\clmomiot\brroamca.exe /d\"C:\Users\Admin\AppData\Local\Temp\c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1784
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description clmomiot "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3120
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start clmomiot
          2⤵
          • Launches sc.exe
          PID:3224
        • 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:5776
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 6016 -s 1316
          2⤵
          • Program crash
          PID:4512
      • C:\Windows\SysWOW64\clmomiot\brroamca.exe
        C:\Windows\SysWOW64\clmomiot\brroamca.exe /d"C:\Users\Admin\AppData\Local\Temp\c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3700
        • 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:2208
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3700 -s 520
          2⤵
          • Program crash
          PID:1796
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 6016 -ip 6016
        1⤵
          PID:4208
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 508 -p 3700 -ip 3700
          1⤵
            PID:1904

          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\brroamca.exe
            Filesize

            12.6MB

            MD5

            f427bf205318891ecd18f60cb4663502

            SHA1

            2c785119566e7ae42c18f82d814700509794e43b

            SHA256

            b14de998814d8e442f1cde35bdaadc0826783bcfc9ffb35afebad6f55aec9882

            SHA512

            54bd16286a9bae7c55db9b8ed4daeabb9f55cef59f174b72cb9ec747e4d4962badf717e64828b315f44d5431d81005f8044225b819747cfb9bd716c8c79b7e23

          • memory/2208-41-0x0000000001BE0000-0x0000000001BF0000-memory.dmp
            Filesize

            64KB

          • memory/2208-35-0x0000000001BE0000-0x0000000001BF0000-memory.dmp
            Filesize

            64KB

          • memory/2208-57-0x0000000002DF0000-0x0000000002DF7000-memory.dmp
            Filesize

            28KB

          • memory/2208-38-0x0000000001BE0000-0x0000000001BF0000-memory.dmp
            Filesize

            64KB

          • memory/2208-32-0x0000000001BE0000-0x0000000001BF0000-memory.dmp
            Filesize

            64KB

          • memory/2208-33-0x0000000001BE0000-0x0000000001BF0000-memory.dmp
            Filesize

            64KB

          • memory/2208-34-0x0000000001BE0000-0x0000000001BF0000-memory.dmp
            Filesize

            64KB

          • memory/2208-12-0x0000000000860000-0x0000000000875000-memory.dmp
            Filesize

            84KB

          • memory/2208-45-0x0000000001BE0000-0x0000000001BF0000-memory.dmp
            Filesize

            64KB

          • memory/2208-16-0x0000000000860000-0x0000000000875000-memory.dmp
            Filesize

            84KB

          • memory/2208-17-0x0000000000860000-0x0000000000875000-memory.dmp
            Filesize

            84KB

          • memory/2208-19-0x0000000000860000-0x0000000000875000-memory.dmp
            Filesize

            84KB

          • memory/2208-21-0x0000000000860000-0x0000000000875000-memory.dmp
            Filesize

            84KB

          • memory/2208-40-0x0000000001BE0000-0x0000000001BF0000-memory.dmp
            Filesize

            64KB

          • memory/2208-29-0x0000000001BE0000-0x0000000001BF0000-memory.dmp
            Filesize

            64KB

          • memory/2208-26-0x00000000009F0000-0x00000000009F6000-memory.dmp
            Filesize

            24KB

          • memory/2208-25-0x0000000002400000-0x000000000260F000-memory.dmp
            Filesize

            2.1MB

          • memory/2208-39-0x0000000001BE0000-0x0000000001BF0000-memory.dmp
            Filesize

            64KB

          • memory/2208-56-0x0000000007A80000-0x0000000007E8B000-memory.dmp
            Filesize

            4.0MB

          • memory/2208-46-0x0000000001BE0000-0x0000000001BF0000-memory.dmp
            Filesize

            64KB

          • memory/2208-22-0x0000000002400000-0x000000000260F000-memory.dmp
            Filesize

            2.1MB

          • memory/2208-42-0x0000000001BE0000-0x0000000001BF0000-memory.dmp
            Filesize

            64KB

          • memory/2208-37-0x0000000001BE0000-0x0000000001BF0000-memory.dmp
            Filesize

            64KB

          • memory/2208-43-0x0000000001BE0000-0x0000000001BF0000-memory.dmp
            Filesize

            64KB

          • memory/2208-44-0x0000000001BE0000-0x0000000001BF0000-memory.dmp
            Filesize

            64KB

          • memory/2208-36-0x0000000001BE0000-0x0000000001BF0000-memory.dmp
            Filesize

            64KB

          • memory/2208-52-0x0000000002DE0000-0x0000000002DE5000-memory.dmp
            Filesize

            20KB

          • memory/2208-53-0x0000000007A80000-0x0000000007E8B000-memory.dmp
            Filesize

            4.0MB

          • memory/2208-49-0x0000000002DE0000-0x0000000002DE5000-memory.dmp
            Filesize

            20KB

          • memory/2208-48-0x0000000001BE0000-0x0000000001BF0000-memory.dmp
            Filesize

            64KB

          • memory/2208-47-0x0000000001BE0000-0x0000000001BF0000-memory.dmp
            Filesize

            64KB

          • memory/3700-13-0x0000000000400000-0x000000000043F000-memory.dmp
            Filesize

            252KB

          • memory/3700-11-0x00000000006C0000-0x00000000007C0000-memory.dmp
            Filesize

            1024KB

          • memory/6016-4-0x0000000000400000-0x000000000043F000-memory.dmp
            Filesize

            252KB

          • memory/6016-1-0x00000000004F0000-0x00000000005F0000-memory.dmp
            Filesize

            1024KB

          • memory/6016-9-0x00000000004C0000-0x00000000004D3000-memory.dmp
            Filesize

            76KB

          • memory/6016-8-0x0000000000400000-0x000000000043F000-memory.dmp
            Filesize

            252KB

          • memory/6016-6-0x0000000000400000-0x000000000043F000-memory.dmp
            Filesize

            252KB

          • memory/6016-2-0x00000000004C0000-0x00000000004D3000-memory.dmp
            Filesize

            76KB