Analysis

  • max time kernel
    144s
  • max time network
    146s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    01-10-2024 11:29

General

  • Target

    102e9252691dc8857840ffae6582731c2077bff8ac04d054407ba804a058e9c4.exe

  • Size

    10.2MB

  • MD5

    eb701a894f2e3202f26d9e0199a6d440

  • SHA1

    4f635af1c4e7669ad5522c999bc632d9d4d53a9a

  • SHA256

    102e9252691dc8857840ffae6582731c2077bff8ac04d054407ba804a058e9c4

  • SHA512

    d87d3b460fd9948da454df80ecde3b49700760bc15c3f3dc0391875fccec8911b29c7e1c88a31c031d2ed40295adcbee0cbcdde612b1225e3d8f1ccf7f7b6df7

  • SSDEEP

    6144:UDVCynACXFFpI0zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzj:k8vmFFp

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\102e9252691dc8857840ffae6582731c2077bff8ac04d054407ba804a058e9c4.exe
    "C:\Users\Admin\AppData\Local\Temp\102e9252691dc8857840ffae6582731c2077bff8ac04d054407ba804a058e9c4.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:5060
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\zvdxorhu\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2496
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\dxcavyvx.exe" C:\Windows\SysWOW64\zvdxorhu\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1140
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create zvdxorhu binPath= "C:\Windows\SysWOW64\zvdxorhu\dxcavyvx.exe /d\"C:\Users\Admin\AppData\Local\Temp\102e9252691dc8857840ffae6582731c2077bff8ac04d054407ba804a058e9c4.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3688
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description zvdxorhu "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2276
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start zvdxorhu
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:5080
    • 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:4600
  • C:\Windows\SysWOW64\zvdxorhu\dxcavyvx.exe
    C:\Windows\SysWOW64\zvdxorhu\dxcavyvx.exe /d"C:\Users\Admin\AppData\Local\Temp\102e9252691dc8857840ffae6582731c2077bff8ac04d054407ba804a058e9c4.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2036
    • 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:3992

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    12.9MB

    MD5

    e239d97290af53ee2132a8d883b89c09

    SHA1

    ef989821aa7437c8d3cb9605d31e8a367a2c3205

    SHA256

    e6f6c6d4bdddf506a909ec2ae0596a60c34b0fbf771fb0cd52d66d4326eba3f0

    SHA512

    a0fea3f8406301f84e2424ba8d409b09c0beac59087e68a450f8dc47bca054af7aa6318a2f5448826f651d17917ee16d2b40760300fb05b2cfe1b6d709863951

  • memory/3992-3-0x0000000000570000-0x0000000000585000-memory.dmp

    Filesize

    84KB

  • memory/3992-6-0x0000000000570000-0x0000000000585000-memory.dmp

    Filesize

    84KB

  • memory/3992-7-0x0000000000570000-0x0000000000585000-memory.dmp

    Filesize

    84KB

  • memory/3992-8-0x0000000000570000-0x0000000000585000-memory.dmp

    Filesize

    84KB

  • memory/3992-10-0x0000000000570000-0x0000000000585000-memory.dmp

    Filesize

    84KB

  • memory/3992-12-0x0000000002400000-0x000000000260F000-memory.dmp

    Filesize

    2.1MB

  • memory/3992-46-0x0000000001BE0000-0x0000000001BE7000-memory.dmp

    Filesize

    28KB

  • memory/3992-42-0x0000000007380000-0x000000000778B000-memory.dmp

    Filesize

    4.0MB

  • memory/3992-41-0x0000000001BD0000-0x0000000001BD5000-memory.dmp

    Filesize

    20KB

  • memory/3992-38-0x0000000001BD0000-0x0000000001BD5000-memory.dmp

    Filesize

    20KB

  • memory/3992-37-0x0000000001B40000-0x0000000001B50000-memory.dmp

    Filesize

    64KB

  • memory/3992-36-0x0000000001B40000-0x0000000001B50000-memory.dmp

    Filesize

    64KB

  • memory/3992-35-0x0000000001B40000-0x0000000001B50000-memory.dmp

    Filesize

    64KB

  • memory/3992-34-0x0000000001B40000-0x0000000001B50000-memory.dmp

    Filesize

    64KB

  • memory/3992-33-0x0000000001B40000-0x0000000001B50000-memory.dmp

    Filesize

    64KB

  • memory/3992-32-0x0000000001B40000-0x0000000001B50000-memory.dmp

    Filesize

    64KB

  • memory/3992-31-0x0000000001B40000-0x0000000001B50000-memory.dmp

    Filesize

    64KB

  • memory/3992-30-0x0000000001B40000-0x0000000001B50000-memory.dmp

    Filesize

    64KB

  • memory/3992-29-0x0000000001B40000-0x0000000001B50000-memory.dmp

    Filesize

    64KB

  • memory/3992-28-0x0000000001B40000-0x0000000001B50000-memory.dmp

    Filesize

    64KB

  • memory/3992-27-0x0000000001B40000-0x0000000001B50000-memory.dmp

    Filesize

    64KB

  • memory/3992-26-0x0000000001B40000-0x0000000001B50000-memory.dmp

    Filesize

    64KB

  • memory/3992-25-0x0000000001B40000-0x0000000001B50000-memory.dmp

    Filesize

    64KB

  • memory/3992-24-0x0000000001B40000-0x0000000001B50000-memory.dmp

    Filesize

    64KB

  • memory/3992-23-0x0000000001B40000-0x0000000001B50000-memory.dmp

    Filesize

    64KB

  • memory/3992-22-0x0000000001B40000-0x0000000001B50000-memory.dmp

    Filesize

    64KB

  • memory/3992-21-0x0000000001B40000-0x0000000001B50000-memory.dmp

    Filesize

    64KB

  • memory/3992-18-0x0000000001B40000-0x0000000001B50000-memory.dmp

    Filesize

    64KB

  • memory/3992-15-0x00000000007F0000-0x00000000007F6000-memory.dmp

    Filesize

    24KB

  • memory/3992-14-0x0000000002400000-0x000000000260F000-memory.dmp

    Filesize

    2.1MB

  • memory/3992-45-0x0000000007380000-0x000000000778B000-memory.dmp

    Filesize

    4.0MB