Analysis

  • max time kernel
    144s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240426-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
  • submitted
    22-05-2024 02:11

General

  • Target

    b7ab94357342f73380569c9b23bc81741e1784b8a7cfdfe8df680000a1f3da1f.exe

  • Size

    178KB

  • MD5

    a6c7dd82eace106350d20d93956360e6

  • SHA1

    19c5ea0607b527e4c2b08a39583db38f503933e0

  • SHA256

    b7ab94357342f73380569c9b23bc81741e1784b8a7cfdfe8df680000a1f3da1f

  • SHA512

    6e3d950e1a16103710985e9e0993f26ece5f7d67eadbd711941e826117d0d884624ddf166d3a70e25453518bb2f7d9a9c2dede25f6785dcb24d6031ba29c419e

  • SSDEEP

    1536:DAc76NGJEzLoCPMkXzxIGzA9aRmNjo/Phcnr6xMtxUtoIlESP5tA9bDQqpN+X:D7kXzxIGzA9aUo/PhcnVHUtoe5K9

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\b7ab94357342f73380569c9b23bc81741e1784b8a7cfdfe8df680000a1f3da1f.exe
    "C:\Users\Admin\AppData\Local\Temp\b7ab94357342f73380569c9b23bc81741e1784b8a7cfdfe8df680000a1f3da1f.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1704
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\bjsblri\
      2⤵
        PID:5072
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\vtiqjzuq.exe" C:\Windows\SysWOW64\bjsblri\
        2⤵
          PID:2568
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create bjsblri binPath= "C:\Windows\SysWOW64\bjsblri\vtiqjzuq.exe /d\"C:\Users\Admin\AppData\Local\Temp\b7ab94357342f73380569c9b23bc81741e1784b8a7cfdfe8df680000a1f3da1f.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3372
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description bjsblri "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2876
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start bjsblri
          2⤵
          • Launches sc.exe
          PID:5068
        • 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:4228
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1704 -s 800
          2⤵
          • Program crash
          PID:4492
      • C:\Windows\SysWOW64\bjsblri\vtiqjzuq.exe
        C:\Windows\SysWOW64\bjsblri\vtiqjzuq.exe /d"C:\Users\Admin\AppData\Local\Temp\b7ab94357342f73380569c9b23bc81741e1784b8a7cfdfe8df680000a1f3da1f.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4488
        • 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:4756
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4488 -s 516
          2⤵
          • Program crash
          PID:3016
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 4488 -ip 4488
        1⤵
          PID:640
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 500 -p 1704 -ip 1704
          1⤵
            PID:4012

          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\vtiqjzuq.exe
            Filesize

            10.1MB

            MD5

            f0fb19ed457122343c97919558fef0f4

            SHA1

            b27d3befed2d068f64e6b53833d78ad6b43d9132

            SHA256

            9c1b4eb2e56b8cb958bdbf8057b330339cc5e2bc5c59b3201640541622d66aed

            SHA512

            d1cff03fd852a8d6148bb20e2406500eb195f653c4a4fa0f44c049ba840760ad139269c7ea371cc24051f055227ed1967fad6b6df0a70a3037d9c91e0a32389c

          • memory/1704-11-0x0000000000400000-0x0000000002349000-memory.dmp
            Filesize

            31.3MB

          • memory/1704-1-0x00000000023B0000-0x00000000024B0000-memory.dmp
            Filesize

            1024KB

          • memory/1704-3-0x0000000000400000-0x0000000000415000-memory.dmp
            Filesize

            84KB

          • memory/1704-2-0x00000000024D0000-0x00000000024E3000-memory.dmp
            Filesize

            76KB

          • memory/1704-13-0x0000000000400000-0x0000000000415000-memory.dmp
            Filesize

            84KB

          • memory/1704-12-0x00000000024D0000-0x00000000024E3000-memory.dmp
            Filesize

            76KB

          • memory/4488-10-0x0000000000400000-0x0000000002349000-memory.dmp
            Filesize

            31.3MB

          • memory/4756-41-0x0000000003110000-0x0000000003120000-memory.dmp
            Filesize

            64KB

          • memory/4756-36-0x0000000003110000-0x0000000003120000-memory.dmp
            Filesize

            64KB

          • memory/4756-15-0x0000000001240000-0x0000000001255000-memory.dmp
            Filesize

            84KB

          • memory/4756-34-0x0000000003110000-0x0000000003120000-memory.dmp
            Filesize

            64KB

          • memory/4756-52-0x00000000033F0000-0x00000000033F7000-memory.dmp
            Filesize

            28KB

          • memory/4756-48-0x0000000007E00000-0x000000000820B000-memory.dmp
            Filesize

            4.0MB

          • memory/4756-47-0x00000000033E0000-0x00000000033E5000-memory.dmp
            Filesize

            20KB

          • memory/4756-44-0x00000000033E0000-0x00000000033E5000-memory.dmp
            Filesize

            20KB

          • memory/4756-43-0x0000000003110000-0x0000000003120000-memory.dmp
            Filesize

            64KB

          • memory/4756-42-0x0000000003110000-0x0000000003120000-memory.dmp
            Filesize

            64KB

          • memory/4756-8-0x0000000001240000-0x0000000001255000-memory.dmp
            Filesize

            84KB

          • memory/4756-40-0x0000000003110000-0x0000000003120000-memory.dmp
            Filesize

            64KB

          • memory/4756-39-0x0000000003110000-0x0000000003120000-memory.dmp
            Filesize

            64KB

          • memory/4756-38-0x0000000003110000-0x0000000003120000-memory.dmp
            Filesize

            64KB

          • memory/4756-37-0x0000000003110000-0x0000000003120000-memory.dmp
            Filesize

            64KB

          • memory/4756-14-0x0000000001240000-0x0000000001255000-memory.dmp
            Filesize

            84KB

          • memory/4756-35-0x0000000003110000-0x0000000003120000-memory.dmp
            Filesize

            64KB

          • memory/4756-33-0x0000000003110000-0x0000000003120000-memory.dmp
            Filesize

            64KB

          • memory/4756-51-0x0000000007E00000-0x000000000820B000-memory.dmp
            Filesize

            4.0MB

          • memory/4756-32-0x0000000003110000-0x0000000003120000-memory.dmp
            Filesize

            64KB

          • memory/4756-31-0x0000000003110000-0x0000000003120000-memory.dmp
            Filesize

            64KB

          • memory/4756-30-0x0000000003110000-0x0000000003120000-memory.dmp
            Filesize

            64KB

          • memory/4756-29-0x0000000003110000-0x0000000003120000-memory.dmp
            Filesize

            64KB

          • memory/4756-28-0x0000000003110000-0x0000000003120000-memory.dmp
            Filesize

            64KB

          • memory/4756-27-0x0000000003110000-0x0000000003120000-memory.dmp
            Filesize

            64KB

          • memory/4756-24-0x0000000003110000-0x0000000003120000-memory.dmp
            Filesize

            64KB

          • memory/4756-21-0x00000000025F0000-0x00000000025F6000-memory.dmp
            Filesize

            24KB

          • memory/4756-20-0x0000000002E00000-0x000000000300F000-memory.dmp
            Filesize

            2.1MB

          • memory/4756-18-0x0000000002E00000-0x000000000300F000-memory.dmp
            Filesize

            2.1MB