Analysis

  • max time kernel
    149s
  • 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 13:03

General

  • Target

    6b880d602f77fc4061a3f6b0a7619e9a8899d9e61eeeea4460eec1d900aeb66f.exe

  • Size

    214KB

  • MD5

    8b9be712ba5f26a1f6369833d52193fb

  • SHA1

    187b0a0888114923e4f611ed90402d7bf0e21733

  • SHA256

    6b880d602f77fc4061a3f6b0a7619e9a8899d9e61eeeea4460eec1d900aeb66f

  • SHA512

    33c457fab7b2910452de37d2a263d46b2391bb4b34b0c37793b6f5875180e92cb2caebfb2ab08e72393b0230407505c94eef6b41040c1500b2b4393fb3b58d08

  • SSDEEP

    3072:YASCGfSRnbJBJ0IQALHFv0raVXyPg9a+lfB0pyTbQ:0fSRnbJBJTLlr04C6

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\6b880d602f77fc4061a3f6b0a7619e9a8899d9e61eeeea4460eec1d900aeb66f.exe
    "C:\Users\Admin\AppData\Local\Temp\6b880d602f77fc4061a3f6b0a7619e9a8899d9e61eeeea4460eec1d900aeb66f.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4984
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\oqjtzhoc\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3292
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\dbqyrhcy.exe" C:\Windows\SysWOW64\oqjtzhoc\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2284
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create oqjtzhoc binPath= "C:\Windows\SysWOW64\oqjtzhoc\dbqyrhcy.exe /d\"C:\Users\Admin\AppData\Local\Temp\6b880d602f77fc4061a3f6b0a7619e9a8899d9e61eeeea4460eec1d900aeb66f.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2376
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description oqjtzhoc "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4800
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start oqjtzhoc
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2312
    • 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:616
  • C:\Windows\SysWOW64\oqjtzhoc\dbqyrhcy.exe
    C:\Windows\SysWOW64\oqjtzhoc\dbqyrhcy.exe /d"C:\Users\Admin\AppData\Local\Temp\6b880d602f77fc4061a3f6b0a7619e9a8899d9e61eeeea4460eec1d900aeb66f.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4832
    • 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:4424

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    13.9MB

    MD5

    baeead996f93cb5838143a567caf8774

    SHA1

    d87d39dc90a4b548d6fc883f3cceef9a66bdaac5

    SHA256

    17eb1c2ff8310133e15421e6892071be5b7ba473ba6b1d474e748c512e5995d6

    SHA512

    4bf4b60e86c9515a45975f66bc84d73cb777481a36d6a2dc718a5c1464753eec65146477d1ab8087fbac2a740a8867cfb8309690cf2bffa826b3b949f3376afe

  • memory/4424-56-0x00000000031E0000-0x00000000031E7000-memory.dmp

    Filesize

    28KB

  • memory/4424-41-0x00000000025B0000-0x00000000025C0000-memory.dmp

    Filesize

    64KB

  • memory/4424-24-0x0000000002E00000-0x000000000300F000-memory.dmp

    Filesize

    2.1MB

  • memory/4424-52-0x0000000007D00000-0x000000000810B000-memory.dmp

    Filesize

    4.0MB

  • memory/4424-33-0x00000000025B0000-0x00000000025C0000-memory.dmp

    Filesize

    64KB

  • memory/4424-34-0x00000000025B0000-0x00000000025C0000-memory.dmp

    Filesize

    64KB

  • memory/4424-35-0x00000000025B0000-0x00000000025C0000-memory.dmp

    Filesize

    64KB

  • memory/4424-37-0x00000000025B0000-0x00000000025C0000-memory.dmp

    Filesize

    64KB

  • memory/4424-38-0x00000000025B0000-0x00000000025C0000-memory.dmp

    Filesize

    64KB

  • memory/4424-14-0x00000000010F0000-0x0000000001105000-memory.dmp

    Filesize

    84KB

  • memory/4424-39-0x00000000025B0000-0x00000000025C0000-memory.dmp

    Filesize

    64KB

  • memory/4424-17-0x00000000010F0000-0x0000000001105000-memory.dmp

    Filesize

    84KB

  • memory/4424-19-0x00000000010F0000-0x0000000001105000-memory.dmp

    Filesize

    84KB

  • memory/4424-55-0x0000000007D00000-0x000000000810B000-memory.dmp

    Filesize

    4.0MB

  • memory/4424-31-0x00000000025B0000-0x00000000025C0000-memory.dmp

    Filesize

    64KB

  • memory/4424-21-0x0000000002E00000-0x000000000300F000-memory.dmp

    Filesize

    2.1MB

  • memory/4424-28-0x00000000025B0000-0x00000000025C0000-memory.dmp

    Filesize

    64KB

  • memory/4424-25-0x00000000025A0000-0x00000000025A6000-memory.dmp

    Filesize

    24KB

  • memory/4424-32-0x00000000025B0000-0x00000000025C0000-memory.dmp

    Filesize

    64KB

  • memory/4424-36-0x00000000025B0000-0x00000000025C0000-memory.dmp

    Filesize

    64KB

  • memory/4424-43-0x00000000025B0000-0x00000000025C0000-memory.dmp

    Filesize

    64KB

  • memory/4424-51-0x00000000031D0000-0x00000000031D5000-memory.dmp

    Filesize

    20KB

  • memory/4424-48-0x00000000031D0000-0x00000000031D5000-memory.dmp

    Filesize

    20KB

  • memory/4424-47-0x00000000025B0000-0x00000000025C0000-memory.dmp

    Filesize

    64KB

  • memory/4424-46-0x00000000025B0000-0x00000000025C0000-memory.dmp

    Filesize

    64KB

  • memory/4424-45-0x00000000025B0000-0x00000000025C0000-memory.dmp

    Filesize

    64KB

  • memory/4424-44-0x00000000025B0000-0x00000000025C0000-memory.dmp

    Filesize

    64KB

  • memory/4424-42-0x00000000025B0000-0x00000000025C0000-memory.dmp

    Filesize

    64KB

  • memory/4424-40-0x00000000025B0000-0x00000000025C0000-memory.dmp

    Filesize

    64KB

  • memory/4832-18-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/4832-13-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/4832-11-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/4832-12-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/4984-3-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/4984-1-0x0000000000670000-0x0000000000770000-memory.dmp

    Filesize

    1024KB

  • memory/4984-8-0x0000000002190000-0x00000000021A3000-memory.dmp

    Filesize

    76KB

  • memory/4984-9-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/4984-7-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/4984-2-0x0000000002190000-0x00000000021A3000-memory.dmp

    Filesize

    76KB