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Analysis

  • max time kernel
    148s
  • max time network
    150s
  • 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, 01:16

General

  • Target

    2cccbfbe95b716e6f8b5ed1634b9ae4e6ab87e1355804ca5aea8d353673ff6a2.exe

  • Size

    423KB

  • MD5

    b2e864c2f8f6e243822a5c133bb41061

  • SHA1

    5571df4cdc5b65cdc315c95ee52344dda7f12b20

  • SHA256

    2cccbfbe95b716e6f8b5ed1634b9ae4e6ab87e1355804ca5aea8d353673ff6a2

  • SHA512

    32a6087702abe92daab3e2c194b07006f5b9d3cdf48c692d23775f0d75e2941882920767148564ac7fedc417beadb1ae75734f240d07bec30eb262ae4f534e73

  • SSDEEP

    6144:qc6OZDisWsD0Td2HJxO+m8PuG1R4WnWjrsaz:q1OZDisvwdaxO0PuG1R4CWs

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 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2cccbfbe95b716e6f8b5ed1634b9ae4e6ab87e1355804ca5aea8d353673ff6a2.exe
    "C:\Users\Admin\AppData\Local\Temp\2cccbfbe95b716e6f8b5ed1634b9ae4e6ab87e1355804ca5aea8d353673ff6a2.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4880
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\grsgfnea\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1580
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ombjcsnj.exe" C:\Windows\SysWOW64\grsgfnea\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1428
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create grsgfnea binPath= "C:\Windows\SysWOW64\grsgfnea\ombjcsnj.exe /d\"C:\Users\Admin\AppData\Local\Temp\2cccbfbe95b716e6f8b5ed1634b9ae4e6ab87e1355804ca5aea8d353673ff6a2.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:728
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description grsgfnea "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1332
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start grsgfnea
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:5100
    • 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:2528
  • C:\Windows\SysWOW64\grsgfnea\ombjcsnj.exe
    C:\Windows\SysWOW64\grsgfnea\ombjcsnj.exe /d"C:\Users\Admin\AppData\Local\Temp\2cccbfbe95b716e6f8b5ed1634b9ae4e6ab87e1355804ca5aea8d353673ff6a2.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4732
    • 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:4728

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    11.5MB

    MD5

    d35bc0600048219c1d54e00fc83f1cc8

    SHA1

    045cc809ebd2499796d6a2b9dc95212541b4cae0

    SHA256

    5fd213722d6bbe5239189eb7b3b2809489c1c6dbca1d1b42b723e888d8e21212

    SHA512

    5591dff0b177b5d863c4b6bae4be1087bd618dfb0e1695d975b8de266acc5062435bc171092e5655a9d75af3e431385a348be7e2fe18cd326518343dec7085ea

  • memory/4728-46-0x00000000023B0000-0x00000000023C0000-memory.dmp

    Filesize

    64KB

  • memory/4728-35-0x00000000023B0000-0x00000000023C0000-memory.dmp

    Filesize

    64KB

  • memory/4728-23-0x0000000002C00000-0x0000000002E0F000-memory.dmp

    Filesize

    2.1MB

  • memory/4728-24-0x00000000023A0000-0x00000000023A6000-memory.dmp

    Filesize

    24KB

  • memory/4728-27-0x00000000023B0000-0x00000000023C0000-memory.dmp

    Filesize

    64KB

  • memory/4728-54-0x0000000007B00000-0x0000000007F0B000-memory.dmp

    Filesize

    4.0MB

  • memory/4728-30-0x00000000023B0000-0x00000000023C0000-memory.dmp

    Filesize

    64KB

  • memory/4728-13-0x0000000000EF0000-0x0000000000F05000-memory.dmp

    Filesize

    84KB

  • memory/4728-17-0x0000000000EF0000-0x0000000000F05000-memory.dmp

    Filesize

    84KB

  • memory/4728-43-0x00000000023B0000-0x00000000023C0000-memory.dmp

    Filesize

    64KB

  • memory/4728-31-0x00000000023B0000-0x00000000023C0000-memory.dmp

    Filesize

    64KB

  • memory/4728-18-0x0000000000EF0000-0x0000000000F05000-memory.dmp

    Filesize

    84KB

  • memory/4728-21-0x0000000002C00000-0x0000000002E0F000-memory.dmp

    Filesize

    2.1MB

  • memory/4728-55-0x0000000002FE0000-0x0000000002FE7000-memory.dmp

    Filesize

    28KB

  • memory/4728-51-0x0000000007B00000-0x0000000007F0B000-memory.dmp

    Filesize

    4.0MB

  • memory/4728-50-0x0000000002FD0000-0x0000000002FD5000-memory.dmp

    Filesize

    20KB

  • memory/4728-47-0x0000000002FD0000-0x0000000002FD5000-memory.dmp

    Filesize

    20KB

  • memory/4728-32-0x00000000023B0000-0x00000000023C0000-memory.dmp

    Filesize

    64KB

  • memory/4728-33-0x00000000023B0000-0x00000000023C0000-memory.dmp

    Filesize

    64KB

  • memory/4728-44-0x00000000023B0000-0x00000000023C0000-memory.dmp

    Filesize

    64KB

  • memory/4728-34-0x00000000023B0000-0x00000000023C0000-memory.dmp

    Filesize

    64KB

  • memory/4728-42-0x00000000023B0000-0x00000000023C0000-memory.dmp

    Filesize

    64KB

  • memory/4728-41-0x00000000023B0000-0x00000000023C0000-memory.dmp

    Filesize

    64KB

  • memory/4728-40-0x00000000023B0000-0x00000000023C0000-memory.dmp

    Filesize

    64KB

  • memory/4728-39-0x00000000023B0000-0x00000000023C0000-memory.dmp

    Filesize

    64KB

  • memory/4728-38-0x00000000023B0000-0x00000000023C0000-memory.dmp

    Filesize

    64KB

  • memory/4728-37-0x00000000023B0000-0x00000000023C0000-memory.dmp

    Filesize

    64KB

  • memory/4728-36-0x00000000023B0000-0x00000000023C0000-memory.dmp

    Filesize

    64KB

  • memory/4728-45-0x00000000023B0000-0x00000000023C0000-memory.dmp

    Filesize

    64KB

  • memory/4732-16-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/4732-11-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/4732-12-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/4880-3-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/4880-1-0x0000000000660000-0x0000000000760000-memory.dmp

    Filesize

    1024KB

  • memory/4880-7-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/4880-8-0x0000000002340000-0x0000000002353000-memory.dmp

    Filesize

    76KB

  • memory/4880-9-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/4880-2-0x0000000002340000-0x0000000002353000-memory.dmp

    Filesize

    76KB