Analysis

  • max time kernel
    148s
  • 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, 11:03

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 6 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:1828
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\bkftgwar\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4124
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\wzsddmnn.exe" C:\Windows\SysWOW64\bkftgwar\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:836
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create bkftgwar binPath= "C:\Windows\SysWOW64\bkftgwar\wzsddmnn.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:440
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description bkftgwar "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2664
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start bkftgwar
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:768
    • 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:3664
  • C:\Windows\SysWOW64\bkftgwar\wzsddmnn.exe
    C:\Windows\SysWOW64\bkftgwar\wzsddmnn.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: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:3964

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    12.6MB

    MD5

    e876b481e2343514eb990e9729ebb651

    SHA1

    8feec4b0d0dde68549ec49ff7d1a544eb7ef6a6e

    SHA256

    8e9c76c9d00d146754aba268b3d9db7a14195f030c58d698297b577ee0fee88f

    SHA512

    f73799dad50b2c095aafbcce043088c1e02c34d374d1f27c2ed36944bf232cab4bacc93ece074b57c9b95d40cb1955e703295dde93892b7a6aeba3897af74b4c

  • memory/1828-1-0x00000000008D0000-0x00000000009D0000-memory.dmp

    Filesize

    1024KB

  • memory/1828-2-0x0000000000890000-0x00000000008A3000-memory.dmp

    Filesize

    76KB

  • memory/1828-4-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/1828-9-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/1828-8-0x0000000000890000-0x00000000008A3000-memory.dmp

    Filesize

    76KB

  • memory/1828-7-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/3964-45-0x0000000001740000-0x0000000001750000-memory.dmp

    Filesize

    64KB

  • memory/3964-41-0x0000000001740000-0x0000000001750000-memory.dmp

    Filesize

    64KB

  • memory/3964-13-0x0000000000180000-0x0000000000195000-memory.dmp

    Filesize

    84KB

  • memory/3964-17-0x0000000000180000-0x0000000000195000-memory.dmp

    Filesize

    84KB

  • memory/3964-24-0x0000000001730000-0x0000000001736000-memory.dmp

    Filesize

    24KB

  • memory/3964-18-0x0000000000180000-0x0000000000195000-memory.dmp

    Filesize

    84KB

  • memory/3964-46-0x0000000001740000-0x0000000001750000-memory.dmp

    Filesize

    64KB

  • memory/3964-55-0x00000000017E0000-0x00000000017E7000-memory.dmp

    Filesize

    28KB

  • memory/3964-51-0x0000000006F80000-0x000000000738B000-memory.dmp

    Filesize

    4.0MB

  • memory/3964-50-0x00000000017D0000-0x00000000017D5000-memory.dmp

    Filesize

    20KB

  • memory/3964-47-0x00000000017D0000-0x00000000017D5000-memory.dmp

    Filesize

    20KB

  • memory/3964-27-0x0000000001740000-0x0000000001750000-memory.dmp

    Filesize

    64KB

  • memory/3964-44-0x0000000001740000-0x0000000001750000-memory.dmp

    Filesize

    64KB

  • memory/3964-43-0x0000000001740000-0x0000000001750000-memory.dmp

    Filesize

    64KB

  • memory/3964-42-0x0000000001740000-0x0000000001750000-memory.dmp

    Filesize

    64KB

  • memory/3964-21-0x0000000002000000-0x000000000220F000-memory.dmp

    Filesize

    2.1MB

  • memory/3964-40-0x0000000001740000-0x0000000001750000-memory.dmp

    Filesize

    64KB

  • memory/3964-39-0x0000000001740000-0x0000000001750000-memory.dmp

    Filesize

    64KB

  • memory/3964-38-0x0000000001740000-0x0000000001750000-memory.dmp

    Filesize

    64KB

  • memory/3964-37-0x0000000001740000-0x0000000001750000-memory.dmp

    Filesize

    64KB

  • memory/3964-36-0x0000000001740000-0x0000000001750000-memory.dmp

    Filesize

    64KB

  • memory/3964-34-0x0000000001740000-0x0000000001750000-memory.dmp

    Filesize

    64KB

  • memory/3964-33-0x0000000001740000-0x0000000001750000-memory.dmp

    Filesize

    64KB

  • memory/3964-32-0x0000000001740000-0x0000000001750000-memory.dmp

    Filesize

    64KB

  • memory/3964-31-0x0000000001740000-0x0000000001750000-memory.dmp

    Filesize

    64KB

  • memory/3964-30-0x0000000001740000-0x0000000001750000-memory.dmp

    Filesize

    64KB

  • memory/3964-23-0x0000000002000000-0x000000000220F000-memory.dmp

    Filesize

    2.1MB

  • memory/3964-54-0x0000000006F80000-0x000000000738B000-memory.dmp

    Filesize

    4.0MB

  • memory/3964-35-0x0000000001740000-0x0000000001750000-memory.dmp

    Filesize

    64KB

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

    Filesize

    2.0MB

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

    Filesize

    2.0MB

  • memory/4860-16-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB