Analysis

  • max time kernel
    147s
  • max time network
    157s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03-09-2024 16:58

General

  • Target

    knkduwqg.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\knkduwqg.exe
    "C:\Users\Admin\AppData\Local\Temp\knkduwqg.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2564
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\nfncwwxh\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3232
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\jvhmjpoc.exe" C:\Windows\SysWOW64\nfncwwxh\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1664
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create nfncwwxh binPath= "C:\Windows\SysWOW64\nfncwwxh\jvhmjpoc.exe /d\"C:\Users\Admin\AppData\Local\Temp\knkduwqg.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2464
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description nfncwwxh "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:5028
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start nfncwwxh
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1948
    • 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:3780
  • C:\Windows\SysWOW64\nfncwwxh\jvhmjpoc.exe
    C:\Windows\SysWOW64\nfncwwxh\jvhmjpoc.exe /d"C:\Users\Admin\AppData\Local\Temp\knkduwqg.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4860
    • 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:696

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    12.9MB

    MD5

    8af999b2462ec43e59823da11b9f0c46

    SHA1

    c87d0be3e9f000bf3feeb006e757627c73b9a36b

    SHA256

    34840b51a7736e75ec7049e7e3cbfed7f0a22623b6d684156e72b04557245ed0

    SHA512

    0949bbba87262a5c71fff80164cc16dfe32a52e8745bb9ef3c65be2cbeeaf9ef3f321a4f93f3793d1946f90171115e039045b49169fa1442717bc34817c42376

  • memory/696-47-0x0000000001DE0000-0x0000000001DE5000-memory.dmp

    Filesize

    20KB

  • memory/696-24-0x0000000001DC0000-0x0000000001DC6000-memory.dmp

    Filesize

    24KB

  • memory/696-23-0x0000000002600000-0x000000000280F000-memory.dmp

    Filesize

    2.1MB

  • memory/696-45-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

    Filesize

    64KB

  • memory/696-27-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

    Filesize

    64KB

  • memory/696-30-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

    Filesize

    64KB

  • memory/696-31-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

    Filesize

    64KB

  • memory/696-32-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

    Filesize

    64KB

  • memory/696-46-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

    Filesize

    64KB

  • memory/696-54-0x0000000007500000-0x000000000790B000-memory.dmp

    Filesize

    4.0MB

  • memory/696-16-0x0000000000900000-0x0000000000915000-memory.dmp

    Filesize

    84KB

  • memory/696-18-0x0000000000900000-0x0000000000915000-memory.dmp

    Filesize

    84KB

  • memory/696-50-0x0000000001DE0000-0x0000000001DE5000-memory.dmp

    Filesize

    20KB

  • memory/696-34-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

    Filesize

    64KB

  • memory/696-21-0x0000000002600000-0x000000000280F000-memory.dmp

    Filesize

    2.1MB

  • memory/696-51-0x0000000007500000-0x000000000790B000-memory.dmp

    Filesize

    4.0MB

  • memory/696-55-0x0000000001DF0000-0x0000000001DF7000-memory.dmp

    Filesize

    28KB

  • memory/696-33-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

    Filesize

    64KB

  • memory/696-13-0x0000000000900000-0x0000000000915000-memory.dmp

    Filesize

    84KB

  • memory/696-35-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

    Filesize

    64KB

  • memory/696-39-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

    Filesize

    64KB

  • memory/696-43-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

    Filesize

    64KB

  • memory/696-42-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

    Filesize

    64KB

  • memory/696-41-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

    Filesize

    64KB

  • memory/696-40-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

    Filesize

    64KB

  • memory/696-44-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

    Filesize

    64KB

  • memory/696-38-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

    Filesize

    64KB

  • memory/696-37-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

    Filesize

    64KB

  • memory/696-36-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

    Filesize

    64KB

  • memory/2564-3-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/2564-1-0x0000000000630000-0x0000000000730000-memory.dmp

    Filesize

    1024KB

  • memory/2564-7-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/2564-8-0x0000000002200000-0x0000000002213000-memory.dmp

    Filesize

    76KB

  • memory/2564-9-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/2564-2-0x0000000002200000-0x0000000002213000-memory.dmp

    Filesize

    76KB

  • memory/4860-17-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/4860-12-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/4860-11-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB