Analysis

  • max time kernel
    150s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    05/09/2024, 01:34

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 7 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:3012
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\rsmpbjd\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:920
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\dknihbbv.exe" C:\Windows\SysWOW64\rsmpbjd\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2296
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create rsmpbjd binPath= "C:\Windows\SysWOW64\rsmpbjd\dknihbbv.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:4664
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description rsmpbjd "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3776
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start rsmpbjd
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4752
    • 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:4888
  • C:\Windows\SysWOW64\rsmpbjd\dknihbbv.exe
    C:\Windows\SysWOW64\rsmpbjd\dknihbbv.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:1564
    • 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:4972

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    10.3MB

    MD5

    dd41914927aeacccc4836aa0383187b4

    SHA1

    efccbde415a7fd69569d2369d3ad8a594a6e624c

    SHA256

    8d31cc9ae3b08690b505514a1c5628333581ab7d30e10571918603fda6439a6c

    SHA512

    b2e869a6f10186286c1c06d5a8b762ed0a197fee6d0b7fbfc8262b84a08df6b3a8b3181eaaccaa3e7a20c475818fafa45b5f4556ba3f1a09d12cdf833dc31b8f

  • memory/1564-17-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/1564-12-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/1564-11-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/3012-1-0x0000000000900000-0x0000000000A00000-memory.dmp

    Filesize

    1024KB

  • memory/3012-3-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/3012-9-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/3012-8-0x0000000000780000-0x0000000000793000-memory.dmp

    Filesize

    76KB

  • memory/3012-7-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/3012-2-0x0000000000780000-0x0000000000793000-memory.dmp

    Filesize

    76KB

  • memory/4972-45-0x0000000001990000-0x00000000019A0000-memory.dmp

    Filesize

    64KB

  • memory/4972-36-0x0000000001990000-0x00000000019A0000-memory.dmp

    Filesize

    64KB

  • memory/4972-18-0x00000000004D0000-0x00000000004E5000-memory.dmp

    Filesize

    84KB

  • memory/4972-55-0x00000000019F0000-0x00000000019F7000-memory.dmp

    Filesize

    28KB

  • memory/4972-54-0x0000000007100000-0x000000000750B000-memory.dmp

    Filesize

    4.0MB

  • memory/4972-50-0x00000000019E0000-0x00000000019E5000-memory.dmp

    Filesize

    20KB

  • memory/4972-47-0x00000000019E0000-0x00000000019E5000-memory.dmp

    Filesize

    20KB

  • memory/4972-46-0x0000000001990000-0x00000000019A0000-memory.dmp

    Filesize

    64KB

  • memory/4972-13-0x00000000004D0000-0x00000000004E5000-memory.dmp

    Filesize

    84KB

  • memory/4972-44-0x0000000001990000-0x00000000019A0000-memory.dmp

    Filesize

    64KB

  • memory/4972-42-0x0000000001990000-0x00000000019A0000-memory.dmp

    Filesize

    64KB

  • memory/4972-41-0x0000000001990000-0x00000000019A0000-memory.dmp

    Filesize

    64KB

  • memory/4972-40-0x0000000001990000-0x00000000019A0000-memory.dmp

    Filesize

    64KB

  • memory/4972-39-0x0000000001990000-0x00000000019A0000-memory.dmp

    Filesize

    64KB

  • memory/4972-38-0x0000000001990000-0x00000000019A0000-memory.dmp

    Filesize

    64KB

  • memory/4972-16-0x00000000004D0000-0x00000000004E5000-memory.dmp

    Filesize

    84KB

  • memory/4972-35-0x0000000001990000-0x00000000019A0000-memory.dmp

    Filesize

    64KB

  • memory/4972-34-0x0000000001990000-0x00000000019A0000-memory.dmp

    Filesize

    64KB

  • memory/4972-33-0x0000000001990000-0x00000000019A0000-memory.dmp

    Filesize

    64KB

  • memory/4972-32-0x0000000001990000-0x00000000019A0000-memory.dmp

    Filesize

    64KB

  • memory/4972-30-0x0000000001990000-0x00000000019A0000-memory.dmp

    Filesize

    64KB

  • memory/4972-23-0x0000000002200000-0x000000000240F000-memory.dmp

    Filesize

    2.1MB

  • memory/4972-51-0x0000000007100000-0x000000000750B000-memory.dmp

    Filesize

    4.0MB

  • memory/4972-43-0x0000000001990000-0x00000000019A0000-memory.dmp

    Filesize

    64KB

  • memory/4972-37-0x0000000001990000-0x00000000019A0000-memory.dmp

    Filesize

    64KB

  • memory/4972-21-0x0000000002200000-0x000000000240F000-memory.dmp

    Filesize

    2.1MB

  • memory/4972-31-0x0000000001990000-0x00000000019A0000-memory.dmp

    Filesize

    64KB

  • memory/4972-27-0x0000000001990000-0x00000000019A0000-memory.dmp

    Filesize

    64KB

  • memory/4972-24-0x0000000001980000-0x0000000001986000-memory.dmp

    Filesize

    24KB