Analysis

  • max time kernel
    149s
  • max time network
    156s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17-04-2024 12:23

General

  • Target

    9f88f8dba6df3a1116c8444e9b03812fcadf4d8bf9f67d6cfcfb42eaae819e70.exe

  • Size

    299KB

  • MD5

    54b34c36efd4417cbcc35e2ac2c3e67c

  • SHA1

    1e8515d94951bdf686fc5e2ab33885fb99efbaeb

  • SHA256

    9f88f8dba6df3a1116c8444e9b03812fcadf4d8bf9f67d6cfcfb42eaae819e70

  • SHA512

    af0134597248b30fd78b3cc7d73760a9aea62d27edcb5be7874373fe8dc04b3e0c6327443fda38ac32a8ba74119cfd7b02b2b711ce3280abbe1335cb6fee62b4

  • SSDEEP

    3072:9LJYk6t5eTZuuC3rYFwHV6nRKgB2k3zjdCZr6TN8TiuFxAXc5OUZdu8HVZO7:9LKlsTa3rYfB24Mr2s4jUTu8HVc7

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\9f88f8dba6df3a1116c8444e9b03812fcadf4d8bf9f67d6cfcfb42eaae819e70.exe
    "C:\Users\Admin\AppData\Local\Temp\9f88f8dba6df3a1116c8444e9b03812fcadf4d8bf9f67d6cfcfb42eaae819e70.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:5008
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\rhwwpwai\
      2⤵
        PID:3608
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\wiuzwcbp.exe" C:\Windows\SysWOW64\rhwwpwai\
        2⤵
          PID:4000
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create rhwwpwai binPath= "C:\Windows\SysWOW64\rhwwpwai\wiuzwcbp.exe /d\"C:\Users\Admin\AppData\Local\Temp\9f88f8dba6df3a1116c8444e9b03812fcadf4d8bf9f67d6cfcfb42eaae819e70.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3992
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description rhwwpwai "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:5084
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start rhwwpwai
          2⤵
          • Launches sc.exe
          PID:3472
        • 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:3132
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 5008 -s 1056
          2⤵
          • Program crash
          PID:4180
      • C:\Windows\SysWOW64\rhwwpwai\wiuzwcbp.exe
        C:\Windows\SysWOW64\rhwwpwai\wiuzwcbp.exe /d"C:\Users\Admin\AppData\Local\Temp\9f88f8dba6df3a1116c8444e9b03812fcadf4d8bf9f67d6cfcfb42eaae819e70.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4472
        • 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:3000
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4472 -s 580
          2⤵
          • Program crash
          PID:3400
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 432 -p 5008 -ip 5008
        1⤵
          PID:4484
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 472 -p 4472 -ip 4472
          1⤵
            PID:4228
          • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
            "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=1408 --field-trial-handle=2676,i,447940133669489189,1353734109898858672,262144 --variations-seed-version /prefetch:8
            1⤵
              PID:900

            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\wiuzwcbp.exe
              Filesize

              10.7MB

              MD5

              97839981c2e147f7fa86436e3d816275

              SHA1

              dcd927efbf574f55a6067c7c9841224a9c6dfb75

              SHA256

              b7b7a650fcff91b62a4ff39f9a1e7050fcc06ee039ca373a7e3ff103bebd2a80

              SHA512

              a4867ca8dced8ee2d84711a2c5197c62408b5751174eb7a37cab2b2afbe35ee2b8110886ed300a94bdfb6e12896b111aa509c5d752150b1bcc00011c2366de0b

            • memory/3000-54-0x0000000006F40000-0x000000000734B000-memory.dmp
              Filesize

              4.0MB

            • memory/3000-26-0x0000000002000000-0x000000000220F000-memory.dmp
              Filesize

              2.1MB

            • memory/3000-62-0x0000000000150000-0x0000000000165000-memory.dmp
              Filesize

              84KB

            • memory/3000-35-0x0000000001720000-0x0000000001730000-memory.dmp
              Filesize

              64KB

            • memory/3000-37-0x0000000001720000-0x0000000001730000-memory.dmp
              Filesize

              64KB

            • memory/3000-40-0x0000000001720000-0x0000000001730000-memory.dmp
              Filesize

              64KB

            • memory/3000-38-0x0000000001720000-0x0000000001730000-memory.dmp
              Filesize

              64KB

            • memory/3000-36-0x0000000001720000-0x0000000001730000-memory.dmp
              Filesize

              64KB

            • memory/3000-13-0x0000000000150000-0x0000000000165000-memory.dmp
              Filesize

              84KB

            • memory/3000-39-0x0000000001720000-0x0000000001730000-memory.dmp
              Filesize

              64KB

            • memory/3000-17-0x0000000000150000-0x0000000000165000-memory.dmp
              Filesize

              84KB

            • memory/3000-42-0x0000000001720000-0x0000000001730000-memory.dmp
              Filesize

              64KB

            • memory/3000-20-0x0000000000150000-0x0000000000165000-memory.dmp
              Filesize

              84KB

            • memory/3000-21-0x0000000000150000-0x0000000000165000-memory.dmp
              Filesize

              84KB

            • memory/3000-23-0x0000000002000000-0x000000000220F000-memory.dmp
              Filesize

              2.1MB

            • memory/3000-50-0x00000000017F0000-0x00000000017F5000-memory.dmp
              Filesize

              20KB

            • memory/3000-27-0x0000000001710000-0x0000000001716000-memory.dmp
              Filesize

              24KB

            • memory/3000-30-0x0000000001720000-0x0000000001730000-memory.dmp
              Filesize

              64KB

            • memory/3000-33-0x0000000001720000-0x0000000001730000-memory.dmp
              Filesize

              64KB

            • memory/3000-34-0x0000000001720000-0x0000000001730000-memory.dmp
              Filesize

              64KB

            • memory/3000-48-0x0000000001720000-0x0000000001730000-memory.dmp
              Filesize

              64KB

            • memory/3000-57-0x0000000006F40000-0x000000000734B000-memory.dmp
              Filesize

              4.0MB

            • memory/3000-58-0x00000000025D0000-0x00000000025D7000-memory.dmp
              Filesize

              28KB

            • memory/3000-41-0x0000000001720000-0x0000000001730000-memory.dmp
              Filesize

              64KB

            • memory/3000-44-0x0000000001720000-0x0000000001730000-memory.dmp
              Filesize

              64KB

            • memory/3000-45-0x0000000001720000-0x0000000001730000-memory.dmp
              Filesize

              64KB

            • memory/3000-46-0x0000000001720000-0x0000000001730000-memory.dmp
              Filesize

              64KB

            • memory/3000-43-0x0000000001720000-0x0000000001730000-memory.dmp
              Filesize

              64KB

            • memory/3000-47-0x0000000001720000-0x0000000001730000-memory.dmp
              Filesize

              64KB

            • memory/3000-49-0x0000000001720000-0x0000000001730000-memory.dmp
              Filesize

              64KB

            • memory/3000-53-0x00000000017F0000-0x00000000017F5000-memory.dmp
              Filesize

              20KB

            • memory/4472-18-0x0000000000400000-0x000000000086C000-memory.dmp
              Filesize

              4.4MB

            • memory/4472-11-0x0000000001150000-0x0000000001163000-memory.dmp
              Filesize

              76KB

            • memory/4472-12-0x0000000000400000-0x000000000086C000-memory.dmp
              Filesize

              4.4MB

            • memory/4472-10-0x0000000000BC0000-0x0000000000CC0000-memory.dmp
              Filesize

              1024KB

            • memory/5008-1-0x0000000000B30000-0x0000000000C30000-memory.dmp
              Filesize

              1024KB

            • memory/5008-2-0x0000000000B10000-0x0000000000B23000-memory.dmp
              Filesize

              76KB

            • memory/5008-3-0x0000000000400000-0x000000000086C000-memory.dmp
              Filesize

              4.4MB

            • memory/5008-16-0x0000000000B30000-0x0000000000C30000-memory.dmp
              Filesize

              1024KB

            • memory/5008-9-0x0000000000400000-0x000000000086C000-memory.dmp
              Filesize

              4.4MB

            • memory/5008-5-0x0000000000400000-0x000000000086C000-memory.dmp
              Filesize

              4.4MB