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 09:21

General

  • Target

    21a5e8cf356706a639eee50ea97cecef91685eb906921245c314ac50950b9825.exe

  • Size

    10.5MB

  • MD5

    274d0ab4368246be7f22990d9d5cb4cf

  • SHA1

    d34547e852863893aef034effc726bf2ee227d02

  • SHA256

    21a5e8cf356706a639eee50ea97cecef91685eb906921245c314ac50950b9825

  • SHA512

    dab676f30f08c6719e26cc376c89803a14d89adf50c6ee31d941f724b3dae03ca1cce950a3dd7651e3ed5f40323b021c875cdd1dfbbba9952cd417d7a3f90e81

  • SSDEEP

    6144:Sc6OZDisWsD0Td2HJxO+m8PuG1R4WnWjrsaz:S1OZDisvwdaxO0PuG1R4CWs

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\21a5e8cf356706a639eee50ea97cecef91685eb906921245c314ac50950b9825.exe
    "C:\Users\Admin\AppData\Local\Temp\21a5e8cf356706a639eee50ea97cecef91685eb906921245c314ac50950b9825.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1856
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\yefbfkmm\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4032
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\aqmbwomu.exe" C:\Windows\SysWOW64\yefbfkmm\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3668
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create yefbfkmm binPath= "C:\Windows\SysWOW64\yefbfkmm\aqmbwomu.exe /d\"C:\Users\Admin\AppData\Local\Temp\21a5e8cf356706a639eee50ea97cecef91685eb906921245c314ac50950b9825.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3228
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description yefbfkmm "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2040
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start yefbfkmm
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4180
    • 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:1280
  • C:\Windows\SysWOW64\yefbfkmm\aqmbwomu.exe
    C:\Windows\SysWOW64\yefbfkmm\aqmbwomu.exe /d"C:\Users\Admin\AppData\Local\Temp\21a5e8cf356706a639eee50ea97cecef91685eb906921245c314ac50950b9825.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4924
    • 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:676

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    12.3MB

    MD5

    e2e2b8e8acd4d474743819be47ad0250

    SHA1

    28ff9751d5cdd369ad6dffc0566b871e562a45aa

    SHA256

    dbf1a5a1a8c175358479b801a9bb8d6362f36aeee549f35dfaef3da3071af30b

    SHA512

    53517b55db6e28ce021a0434a4e3cd3575cd62600e009471511ee370adcdf688471bc8e32634d5c040698fb5ada23aa9ba9166f79242f72d02c5cc2c1f1cad58

  • memory/676-50-0x00000000019F0000-0x00000000019F5000-memory.dmp

    Filesize

    20KB

  • memory/676-36-0x00000000019E0000-0x00000000019F0000-memory.dmp

    Filesize

    64KB

  • memory/676-45-0x00000000019E0000-0x00000000019F0000-memory.dmp

    Filesize

    64KB

  • memory/676-46-0x00000000019E0000-0x00000000019F0000-memory.dmp

    Filesize

    64KB

  • memory/676-24-0x00000000007F0000-0x00000000007F6000-memory.dmp

    Filesize

    24KB

  • memory/676-30-0x00000000019E0000-0x00000000019F0000-memory.dmp

    Filesize

    64KB

  • memory/676-31-0x00000000019E0000-0x00000000019F0000-memory.dmp

    Filesize

    64KB

  • memory/676-32-0x00000000019E0000-0x00000000019F0000-memory.dmp

    Filesize

    64KB

  • memory/676-47-0x00000000019F0000-0x00000000019F5000-memory.dmp

    Filesize

    20KB

  • memory/676-17-0x0000000000610000-0x0000000000625000-memory.dmp

    Filesize

    84KB

  • memory/676-33-0x00000000019E0000-0x00000000019F0000-memory.dmp

    Filesize

    64KB

  • memory/676-18-0x0000000000610000-0x0000000000625000-memory.dmp

    Filesize

    84KB

  • memory/676-20-0x0000000002200000-0x000000000240F000-memory.dmp

    Filesize

    2.1MB

  • memory/676-27-0x00000000019E0000-0x00000000019F0000-memory.dmp

    Filesize

    64KB

  • memory/676-55-0x00000000027D0000-0x00000000027D7000-memory.dmp

    Filesize

    28KB

  • memory/676-54-0x0000000007200000-0x000000000760B000-memory.dmp

    Filesize

    4.0MB

  • memory/676-51-0x0000000007200000-0x000000000760B000-memory.dmp

    Filesize

    4.0MB

  • memory/676-34-0x00000000019E0000-0x00000000019F0000-memory.dmp

    Filesize

    64KB

  • memory/676-13-0x0000000000610000-0x0000000000625000-memory.dmp

    Filesize

    84KB

  • memory/676-23-0x0000000002200000-0x000000000240F000-memory.dmp

    Filesize

    2.1MB

  • memory/676-39-0x00000000019E0000-0x00000000019F0000-memory.dmp

    Filesize

    64KB

  • memory/676-43-0x00000000019E0000-0x00000000019F0000-memory.dmp

    Filesize

    64KB

  • memory/676-42-0x00000000019E0000-0x00000000019F0000-memory.dmp

    Filesize

    64KB

  • memory/676-41-0x00000000019E0000-0x00000000019F0000-memory.dmp

    Filesize

    64KB

  • memory/676-40-0x00000000019E0000-0x00000000019F0000-memory.dmp

    Filesize

    64KB

  • memory/676-44-0x00000000019E0000-0x00000000019F0000-memory.dmp

    Filesize

    64KB

  • memory/676-38-0x00000000019E0000-0x00000000019F0000-memory.dmp

    Filesize

    64KB

  • memory/676-37-0x00000000019E0000-0x00000000019F0000-memory.dmp

    Filesize

    64KB

  • memory/676-35-0x00000000019E0000-0x00000000019F0000-memory.dmp

    Filesize

    64KB

  • memory/1856-3-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/1856-1-0x0000000000780000-0x0000000000880000-memory.dmp

    Filesize

    1024KB

  • memory/1856-7-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/1856-8-0x0000000002340000-0x0000000002353000-memory.dmp

    Filesize

    76KB

  • memory/1856-9-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/1856-2-0x0000000002340000-0x0000000002353000-memory.dmp

    Filesize

    76KB

  • memory/4924-15-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/4924-11-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/4924-12-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB