Analysis

  • max time kernel
    147s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    04-09-2024 06:44

General

  • Target

    2d49ab2f33264eb29d38ab91a7c6dc193a6a0fa65260b0295b1123c18612d7c5.exe

  • Size

    11.8MB

  • MD5

    b32f61c5c47e9473cf4a0ac98e8143c1

  • SHA1

    d6de6d48a87510f4ba641785e56311a4732dcf26

  • SHA256

    2d49ab2f33264eb29d38ab91a7c6dc193a6a0fa65260b0295b1123c18612d7c5

  • SHA512

    cc0cc0499616d0277920597b7beb8ee0b53d99c9e8d8c827c6e2244dc9a98785a848f17368f6991d362f9b6f76cd3a1f7ebcc31e99c34097c458872336ab5c21

  • SSDEEP

    6144:9c6OZDisWsD0Td2HJxO+m8PuG1R4WnWjrsaz:91OZDisvwdaxO0PuG1R4CWs

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).

  • Event Triggered Execution: Netsh Helper DLL 1 TTPs 3 IoCs

    Netsh.exe (also referred to as Netshell) is a command-line scripting utility used to interact with the network configuration of a system.

  • System Location Discovery: System Language Discovery 1 TTPs 9 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Modifies data under HKEY_USERS 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2d49ab2f33264eb29d38ab91a7c6dc193a6a0fa65260b0295b1123c18612d7c5.exe
    "C:\Users\Admin\AppData\Local\Temp\2d49ab2f33264eb29d38ab91a7c6dc193a6a0fa65260b0295b1123c18612d7c5.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4420
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\kjozuhqj\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4552
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\oaiflyec.exe" C:\Windows\SysWOW64\kjozuhqj\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1992
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create kjozuhqj binPath= "C:\Windows\SysWOW64\kjozuhqj\oaiflyec.exe /d\"C:\Users\Admin\AppData\Local\Temp\2d49ab2f33264eb29d38ab91a7c6dc193a6a0fa65260b0295b1123c18612d7c5.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:944
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description kjozuhqj "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3064
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start kjozuhqj
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2040
    • 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
      • Event Triggered Execution: Netsh Helper DLL
      • System Location Discovery: System Language Discovery
      PID:4572
  • C:\Windows\SysWOW64\kjozuhqj\oaiflyec.exe
    C:\Windows\SysWOW64\kjozuhqj\oaiflyec.exe /d"C:\Users\Admin\AppData\Local\Temp\2d49ab2f33264eb29d38ab91a7c6dc193a6a0fa65260b0295b1123c18612d7c5.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2540
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Sets service image path in registry
      • Deletes itself
      • Drops file in System32 directory
      • System Location Discovery: System Language Discovery
      • Modifies data under HKEY_USERS
      PID:1408

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Temp\oaiflyec.exe

    Filesize

    11.2MB

    MD5

    3482cbbb23d7548633dde35f128ea40a

    SHA1

    b8cba7389b8e195b30ceb2e1a2b1d1fd6129adbd

    SHA256

    8777baf9f5a68be1faf17fa6f7c5ab3de0113392784cc150b822b7db5426e380

    SHA512

    db334c6aae52045ff3ce7597f172cce21f5a3a61a85b8dd4c5517eac649b60e429df968e1538c99080449d0ebfb5d8e917cb43bfa105e27d0a790ca2463748c7

  • memory/1408-45-0x00000000021A0000-0x00000000021B0000-memory.dmp

    Filesize

    64KB

  • memory/1408-46-0x00000000021A0000-0x00000000021B0000-memory.dmp

    Filesize

    64KB

  • memory/1408-25-0x0000000002190000-0x0000000002196000-memory.dmp

    Filesize

    24KB

  • memory/1408-47-0x00000000021A0000-0x00000000021B0000-memory.dmp

    Filesize

    64KB

  • memory/1408-31-0x00000000021A0000-0x00000000021B0000-memory.dmp

    Filesize

    64KB

  • memory/1408-36-0x00000000021A0000-0x00000000021B0000-memory.dmp

    Filesize

    64KB

  • memory/1408-22-0x0000000002A00000-0x0000000002C0F000-memory.dmp

    Filesize

    2.1MB

  • memory/1408-24-0x0000000002A00000-0x0000000002C0F000-memory.dmp

    Filesize

    2.1MB

  • memory/1408-32-0x00000000021A0000-0x00000000021B0000-memory.dmp

    Filesize

    64KB

  • memory/1408-14-0x0000000000CE0000-0x0000000000CF5000-memory.dmp

    Filesize

    84KB

  • memory/1408-17-0x0000000000CE0000-0x0000000000CF5000-memory.dmp

    Filesize

    84KB

  • memory/1408-33-0x00000000021A0000-0x00000000021B0000-memory.dmp

    Filesize

    64KB

  • memory/1408-19-0x0000000000CE0000-0x0000000000CF5000-memory.dmp

    Filesize

    84KB

  • memory/1408-44-0x00000000021A0000-0x00000000021B0000-memory.dmp

    Filesize

    64KB

  • memory/1408-56-0x0000000002DD0000-0x0000000002DD7000-memory.dmp

    Filesize

    28KB

  • memory/1408-52-0x0000000007900000-0x0000000007D0B000-memory.dmp

    Filesize

    4.0MB

  • memory/1408-51-0x00000000021F0000-0x00000000021F5000-memory.dmp

    Filesize

    20KB

  • memory/1408-48-0x00000000021F0000-0x00000000021F5000-memory.dmp

    Filesize

    20KB

  • memory/1408-28-0x00000000021A0000-0x00000000021B0000-memory.dmp

    Filesize

    64KB

  • memory/1408-34-0x00000000021A0000-0x00000000021B0000-memory.dmp

    Filesize

    64KB

  • memory/1408-55-0x0000000007900000-0x0000000007D0B000-memory.dmp

    Filesize

    4.0MB

  • memory/1408-43-0x00000000021A0000-0x00000000021B0000-memory.dmp

    Filesize

    64KB

  • memory/1408-42-0x00000000021A0000-0x00000000021B0000-memory.dmp

    Filesize

    64KB

  • memory/1408-41-0x00000000021A0000-0x00000000021B0000-memory.dmp

    Filesize

    64KB

  • memory/1408-40-0x00000000021A0000-0x00000000021B0000-memory.dmp

    Filesize

    64KB

  • memory/1408-39-0x00000000021A0000-0x00000000021B0000-memory.dmp

    Filesize

    64KB

  • memory/1408-38-0x00000000021A0000-0x00000000021B0000-memory.dmp

    Filesize

    64KB

  • memory/1408-37-0x00000000021A0000-0x00000000021B0000-memory.dmp

    Filesize

    64KB

  • memory/1408-35-0x00000000021A0000-0x00000000021B0000-memory.dmp

    Filesize

    64KB

  • memory/2540-18-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/2540-12-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/2540-13-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/2540-11-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/4420-3-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/4420-1-0x00000000007B0000-0x00000000008B0000-memory.dmp

    Filesize

    1024KB

  • memory/4420-7-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/4420-8-0x0000000000760000-0x0000000000773000-memory.dmp

    Filesize

    76KB

  • memory/4420-9-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/4420-2-0x0000000000760000-0x0000000000773000-memory.dmp

    Filesize

    76KB