Analysis

  • max time kernel
    150s
  • max time network
    156s
  • platform
    windows7_x64
  • resource
    win7-20240704-en
  • resource tags

    arch:x64arch:x86image:win7-20240704-enlocale:en-usos:windows7-x64system
  • submitted
    23-07-2024 15:16

General

  • Target

    rRBVVlBwia.exe

  • Size

    301KB

  • MD5

    547d22725d299a21760e957f1522d03b

  • SHA1

    5fc9a7b3d3b118b38d1b76f33eba59ba3f49e33e

  • SHA256

    d99e41c304f50b2548a79f43cfea1de5d96ceb38b254ed8057b59ae190916200

  • SHA512

    ee486698fa1952464d08a9987679b2a28fc1d54cb9635ed92392f896368375f60ed139bc82ee846d35ea1f6ec409989a7aa9bbd1c39912fdbec15f375a0cb4ea

  • SSDEEP

    3072:eMbOOm6/FBMTUrZXzYzRbWW2DA6mMY0bX2pk0Bhi25P3SSklv9ATu:eMDLt5ZXkzRitDcMpbXMk0Dvx3kN9AT

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.

  • Windows security bypass 2 TTPs 1 IoCs
  • Creates new service(s) 2 TTPs
  • Modifies Windows Firewall 2 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • 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 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\rRBVVlBwia.exe
    "C:\Users\Admin\AppData\Local\Temp\rRBVVlBwia.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2080
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\iglbchnw\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2112
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\cfcvmoiy.exe" C:\Windows\SysWOW64\iglbchnw\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2348
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create iglbchnw binPath= "C:\Windows\SysWOW64\iglbchnw\cfcvmoiy.exe /d\"C:\Users\Admin\AppData\Local\Temp\rRBVVlBwia.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2808
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description iglbchnw "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2748
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start iglbchnw
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2700
    • 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:2728
  • C:\Windows\SysWOW64\iglbchnw\cfcvmoiy.exe
    C:\Windows\SysWOW64\iglbchnw\cfcvmoiy.exe /d"C:\Users\Admin\AppData\Local\Temp\rRBVVlBwia.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2640
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Windows security bypass
      • 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:2660

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Temp\cfcvmoiy.exe
    Filesize

    10.9MB

    MD5

    eafd225e384ce9588b69cefcbb3cb3ea

    SHA1

    e16029b1e9ccf730d38e4091dcac76ee0fba3867

    SHA256

    465f4afd069a9043bb8b6d1a6f8301934437890fad9f27a0ab83f8a45eb51229

    SHA512

    748c2ce53c81f1f854f0a466522d19cc068a3b9b06eeaee8265edabdc45b15027dd75b03190948c67cbdc32e268e14a8db0dc81f1d45741eb4dbad88357c4810

  • memory/2080-2-0x0000000000220000-0x0000000000233000-memory.dmp
    Filesize

    76KB

  • memory/2080-3-0x0000000000400000-0x0000000000415000-memory.dmp
    Filesize

    84KB

  • memory/2080-8-0x0000000000400000-0x0000000000415000-memory.dmp
    Filesize

    84KB

  • memory/2080-7-0x0000000000220000-0x0000000000233000-memory.dmp
    Filesize

    76KB

  • memory/2080-6-0x0000000000400000-0x0000000002464000-memory.dmp
    Filesize

    32.4MB

  • memory/2080-1-0x00000000025F0000-0x00000000026F0000-memory.dmp
    Filesize

    1024KB

  • memory/2640-17-0x0000000000400000-0x0000000002464000-memory.dmp
    Filesize

    32.4MB

  • memory/2660-31-0x0000000000120000-0x0000000000130000-memory.dmp
    Filesize

    64KB

  • memory/2660-34-0x0000000000120000-0x0000000000130000-memory.dmp
    Filesize

    64KB

  • memory/2660-11-0x0000000000080000-0x0000000000095000-memory.dmp
    Filesize

    84KB

  • memory/2660-18-0x0000000000080000-0x0000000000095000-memory.dmp
    Filesize

    84KB

  • memory/2660-14-0x0000000000080000-0x0000000000095000-memory.dmp
    Filesize

    84KB

  • memory/2660-27-0x0000000000120000-0x0000000000130000-memory.dmp
    Filesize

    64KB

  • memory/2660-24-0x0000000000110000-0x0000000000116000-memory.dmp
    Filesize

    24KB

  • memory/2660-23-0x0000000001A80000-0x0000000001C8F000-memory.dmp
    Filesize

    2.1MB

  • memory/2660-20-0x0000000001A80000-0x0000000001C8F000-memory.dmp
    Filesize

    2.1MB

  • memory/2660-32-0x0000000000120000-0x0000000000130000-memory.dmp
    Filesize

    64KB

  • memory/2660-16-0x0000000000080000-0x0000000000095000-memory.dmp
    Filesize

    84KB

  • memory/2660-30-0x0000000000120000-0x0000000000130000-memory.dmp
    Filesize

    64KB

  • memory/2660-37-0x0000000000120000-0x0000000000130000-memory.dmp
    Filesize

    64KB

  • memory/2660-36-0x0000000000120000-0x0000000000130000-memory.dmp
    Filesize

    64KB

  • memory/2660-35-0x0000000000120000-0x0000000000130000-memory.dmp
    Filesize

    64KB

  • memory/2660-13-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
    Filesize

    4KB

  • memory/2660-33-0x0000000000120000-0x0000000000130000-memory.dmp
    Filesize

    64KB

  • memory/2660-38-0x0000000000120000-0x0000000000130000-memory.dmp
    Filesize

    64KB

  • memory/2660-50-0x0000000000270000-0x0000000000275000-memory.dmp
    Filesize

    20KB

  • memory/2660-51-0x0000000005410000-0x000000000581B000-memory.dmp
    Filesize

    4.0MB

  • memory/2660-47-0x0000000000270000-0x0000000000275000-memory.dmp
    Filesize

    20KB

  • memory/2660-46-0x0000000000120000-0x0000000000130000-memory.dmp
    Filesize

    64KB

  • memory/2660-45-0x0000000000120000-0x0000000000130000-memory.dmp
    Filesize

    64KB

  • memory/2660-44-0x0000000000120000-0x0000000000130000-memory.dmp
    Filesize

    64KB

  • memory/2660-43-0x0000000000120000-0x0000000000130000-memory.dmp
    Filesize

    64KB

  • memory/2660-42-0x0000000000120000-0x0000000000130000-memory.dmp
    Filesize

    64KB

  • memory/2660-41-0x0000000000120000-0x0000000000130000-memory.dmp
    Filesize

    64KB

  • memory/2660-40-0x0000000000120000-0x0000000000130000-memory.dmp
    Filesize

    64KB

  • memory/2660-39-0x0000000000120000-0x0000000000130000-memory.dmp
    Filesize

    64KB

  • memory/2660-55-0x00000000002C0000-0x00000000002C7000-memory.dmp
    Filesize

    28KB

  • memory/2660-54-0x0000000005410000-0x000000000581B000-memory.dmp
    Filesize

    4.0MB