Analysis

  • max time kernel
    149s
  • max time network
    149s
  • platform
    windows7_x64
  • resource
    win7-20240729-en
  • resource tags

    arch:x64arch:x86image:win7-20240729-enlocale:en-usos:windows7-x64system
  • submitted
    04-09-2024 14:49

General

  • Target

    a8264147bc22a02d977fa5d57b3169ccbc313dc35ba2b788da0cb7dce84f0b02.exe

  • Size

    190KB

  • MD5

    62947f28aedffbba7b8424fa764d33ac

  • SHA1

    baca398418a7e83b07ae924694897428660f936a

  • SHA256

    a8264147bc22a02d977fa5d57b3169ccbc313dc35ba2b788da0cb7dce84f0b02

  • SHA512

    5be7ecc2c6ec5056cc9db02fb0e8f694154a55bafa96f2943ead5c2b0730ddbcb82739ea6b2769fb93fee62bc15a9b2bc30de24d90dcc40cc64be6186f2b9279

  • SSDEEP

    3072:aH+lBBpz9/vh9yx37T/xvyNvypa7spopsUyqpr3xFbQ:nBpz9/vh9yxrbxvyN/pdJtz

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\a8264147bc22a02d977fa5d57b3169ccbc313dc35ba2b788da0cb7dce84f0b02.exe
    "C:\Users\Admin\AppData\Local\Temp\a8264147bc22a02d977fa5d57b3169ccbc313dc35ba2b788da0cb7dce84f0b02.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2232
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\rngmuubf\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1308
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ybuffopp.exe" C:\Windows\SysWOW64\rngmuubf\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:548
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create rngmuubf binPath= "C:\Windows\SysWOW64\rngmuubf\ybuffopp.exe /d\"C:\Users\Admin\AppData\Local\Temp\a8264147bc22a02d977fa5d57b3169ccbc313dc35ba2b788da0cb7dce84f0b02.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2796
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description rngmuubf "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2508
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start rngmuubf
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2808
    • 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:2844
  • C:\Windows\SysWOW64\rngmuubf\ybuffopp.exe
    C:\Windows\SysWOW64\rngmuubf\ybuffopp.exe /d"C:\Users\Admin\AppData\Local\Temp\a8264147bc22a02d977fa5d57b3169ccbc313dc35ba2b788da0cb7dce84f0b02.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2872
    • 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:2732

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    12.7MB

    MD5

    1ff344d47a93992a44efaa44cf538ea5

    SHA1

    8de6614943d7effa33256e4611d4ecc25dbd8791

    SHA256

    4436873810012d7f839e817e0a9657b7e0f41931ccecab0ee65f748eb276943e

    SHA512

    a1f910798db74e92ed206cba810a8d2a92d5aa6d3c31a991ef9a295a46e79121132be22964115b200fc76ce5d76f220df40c9ebaed9dca6694bcbb8a98438496

  • memory/2232-16-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/2232-2-0x0000000000220000-0x0000000000233000-memory.dmp

    Filesize

    76KB

  • memory/2232-3-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/2232-1-0x0000000000540000-0x0000000000640000-memory.dmp

    Filesize

    1024KB

  • memory/2232-14-0x0000000000400000-0x0000000000437000-memory.dmp

    Filesize

    220KB

  • memory/2232-15-0x0000000000220000-0x0000000000233000-memory.dmp

    Filesize

    76KB

  • memory/2732-54-0x00000000054F0000-0x00000000058FB000-memory.dmp

    Filesize

    4.0MB

  • memory/2732-46-0x0000000000260000-0x0000000000270000-memory.dmp

    Filesize

    64KB

  • memory/2732-10-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

    Filesize

    4KB

  • memory/2732-11-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2732-17-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2732-18-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2732-20-0x0000000001830000-0x0000000001A3F000-memory.dmp

    Filesize

    2.1MB

  • memory/2732-27-0x0000000000260000-0x0000000000270000-memory.dmp

    Filesize

    64KB

  • memory/2732-24-0x00000000000A0000-0x00000000000A6000-memory.dmp

    Filesize

    24KB

  • memory/2732-23-0x0000000001830000-0x0000000001A3F000-memory.dmp

    Filesize

    2.1MB

  • memory/2732-55-0x0000000000280000-0x0000000000287000-memory.dmp

    Filesize

    28KB

  • memory/2732-8-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2732-51-0x00000000054F0000-0x00000000058FB000-memory.dmp

    Filesize

    4.0MB

  • memory/2732-50-0x0000000000270000-0x0000000000275000-memory.dmp

    Filesize

    20KB

  • memory/2732-47-0x0000000000270000-0x0000000000275000-memory.dmp

    Filesize

    20KB

  • memory/2732-30-0x0000000000260000-0x0000000000270000-memory.dmp

    Filesize

    64KB

  • memory/2732-45-0x0000000000260000-0x0000000000270000-memory.dmp

    Filesize

    64KB

  • memory/2732-44-0x0000000000260000-0x0000000000270000-memory.dmp

    Filesize

    64KB

  • memory/2732-43-0x0000000000260000-0x0000000000270000-memory.dmp

    Filesize

    64KB

  • memory/2732-42-0x0000000000260000-0x0000000000270000-memory.dmp

    Filesize

    64KB

  • memory/2732-41-0x0000000000260000-0x0000000000270000-memory.dmp

    Filesize

    64KB

  • memory/2732-40-0x0000000000260000-0x0000000000270000-memory.dmp

    Filesize

    64KB

  • memory/2732-39-0x0000000000260000-0x0000000000270000-memory.dmp

    Filesize

    64KB

  • memory/2732-38-0x0000000000260000-0x0000000000270000-memory.dmp

    Filesize

    64KB

  • memory/2732-37-0x0000000000260000-0x0000000000270000-memory.dmp

    Filesize

    64KB

  • memory/2732-36-0x0000000000260000-0x0000000000270000-memory.dmp

    Filesize

    64KB

  • memory/2732-35-0x0000000000260000-0x0000000000270000-memory.dmp

    Filesize

    64KB

  • memory/2732-34-0x0000000000260000-0x0000000000270000-memory.dmp

    Filesize

    64KB

  • memory/2732-33-0x0000000000260000-0x0000000000270000-memory.dmp

    Filesize

    64KB

  • memory/2732-32-0x0000000000260000-0x0000000000270000-memory.dmp

    Filesize

    64KB

  • memory/2732-31-0x0000000000260000-0x0000000000270000-memory.dmp

    Filesize

    64KB

  • memory/2872-12-0x0000000000400000-0x0000000000437000-memory.dmp

    Filesize

    220KB