Analysis

  • max time kernel
    147s
  • max time network
    153s
  • platform
    windows10-1703_x64
  • resource
    win10-20240404-en
  • resource tags

    arch:x64arch:x86image:win10-20240404-enlocale:en-usos:windows10-1703-x64system
  • submitted
    02-09-2024 14:46

General

  • Target

    bEsOrli29K.exe

  • Size

    213KB

  • MD5

    a3247152e18ba6e88311f082a86515d3

  • SHA1

    80da2f14bb17f2d3ff1df6faf25622ebb8cf00c8

  • SHA256

    02c6f9163a5d988cee3ab12c11e03b18329c26d6b4863004f943133654693e97

  • SHA512

    b09fc49d7126b37c37f499be522c4b57e7538d2f64600bd789c93d90a315a023f0fbed9466c6069a38bb8c80bc9a6b250fcaec03b59ecfb3a40754c235c3e6d8

  • SSDEEP

    3072:AOFL8HN3BB33u/iMUk6efofpWqX2hnesi5kb:tLqN3Bt36iM/ofpKhn9

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
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • 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\bEsOrli29K.exe
    "C:\Users\Admin\AppData\Local\Temp\bEsOrli29K.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1572
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\kcwrccnj\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2260
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ipobjjrv.exe" C:\Windows\SysWOW64\kcwrccnj\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3848
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create kcwrccnj binPath= "C:\Windows\SysWOW64\kcwrccnj\ipobjjrv.exe /d\"C:\Users\Admin\AppData\Local\Temp\bEsOrli29K.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4924
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description kcwrccnj "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3328
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start kcwrccnj
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4416
    • 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:4680
  • C:\Windows\SysWOW64\kcwrccnj\ipobjjrv.exe
    C:\Windows\SysWOW64\kcwrccnj\ipobjjrv.exe /d"C:\Users\Admin\AppData\Local\Temp\bEsOrli29K.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3660
    • 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:4176

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    10.0MB

    MD5

    3a29ec25093ac0866f77e4cc35a0c4a6

    SHA1

    336cb6724b284e125dd8eeabbc8a05e17a644052

    SHA256

    a20c0822ae355d212dddd7ca09bfa83b9fad800a6a5cccb261aacd226605679b

    SHA512

    60b41800ae9425a572e412f27f20c22705ba7ae71286ef77a2e5328997c3c43bdac5f4615729d1d40cf69dcf234b1124f33a4b3d2cd3aa08e472c0f72c93b795

  • memory/1572-1-0x0000000000500000-0x0000000000600000-memory.dmp

    Filesize

    1024KB

  • memory/1572-3-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/1572-9-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/1572-8-0x00000000004D0000-0x00000000004E3000-memory.dmp

    Filesize

    76KB

  • memory/1572-7-0x0000000000400000-0x0000000000448000-memory.dmp

    Filesize

    288KB

  • memory/1572-2-0x00000000004D0000-0x00000000004E3000-memory.dmp

    Filesize

    76KB

  • memory/3660-12-0x0000000000400000-0x0000000000448000-memory.dmp

    Filesize

    288KB

  • memory/4176-44-0x0000000001130000-0x0000000001140000-memory.dmp

    Filesize

    64KB

  • memory/4176-39-0x0000000001130000-0x0000000001140000-memory.dmp

    Filesize

    64KB

  • memory/4176-17-0x0000000000F50000-0x0000000000F65000-memory.dmp

    Filesize

    84KB

  • memory/4176-20-0x0000000004D50000-0x0000000004F5F000-memory.dmp

    Filesize

    2.1MB

  • memory/4176-22-0x0000000004D50000-0x0000000004F5F000-memory.dmp

    Filesize

    2.1MB

  • memory/4176-54-0x00000000031F0000-0x00000000031F7000-memory.dmp

    Filesize

    28KB

  • memory/4176-50-0x0000000009450000-0x000000000985B000-memory.dmp

    Filesize

    4.0MB

  • memory/4176-49-0x0000000001140000-0x0000000001145000-memory.dmp

    Filesize

    20KB

  • memory/4176-46-0x0000000001140000-0x0000000001145000-memory.dmp

    Filesize

    20KB

  • memory/4176-45-0x0000000001130000-0x0000000001140000-memory.dmp

    Filesize

    64KB

  • memory/4176-11-0x0000000000F50000-0x0000000000F65000-memory.dmp

    Filesize

    84KB

  • memory/4176-43-0x0000000001130000-0x0000000001140000-memory.dmp

    Filesize

    64KB

  • memory/4176-42-0x0000000001130000-0x0000000001140000-memory.dmp

    Filesize

    64KB

  • memory/4176-41-0x0000000001130000-0x0000000001140000-memory.dmp

    Filesize

    64KB

  • memory/4176-40-0x0000000001130000-0x0000000001140000-memory.dmp

    Filesize

    64KB

  • memory/4176-16-0x0000000000F50000-0x0000000000F65000-memory.dmp

    Filesize

    84KB

  • memory/4176-38-0x0000000001130000-0x0000000001140000-memory.dmp

    Filesize

    64KB

  • memory/4176-37-0x0000000001130000-0x0000000001140000-memory.dmp

    Filesize

    64KB

  • memory/4176-36-0x0000000001130000-0x0000000001140000-memory.dmp

    Filesize

    64KB

  • memory/4176-35-0x0000000001130000-0x0000000001140000-memory.dmp

    Filesize

    64KB

  • memory/4176-34-0x0000000001130000-0x0000000001140000-memory.dmp

    Filesize

    64KB

  • memory/4176-33-0x0000000001130000-0x0000000001140000-memory.dmp

    Filesize

    64KB

  • memory/4176-32-0x0000000001130000-0x0000000001140000-memory.dmp

    Filesize

    64KB

  • memory/4176-31-0x0000000001130000-0x0000000001140000-memory.dmp

    Filesize

    64KB

  • memory/4176-30-0x0000000001130000-0x0000000001140000-memory.dmp

    Filesize

    64KB

  • memory/4176-29-0x0000000001130000-0x0000000001140000-memory.dmp

    Filesize

    64KB

  • memory/4176-26-0x0000000001130000-0x0000000001140000-memory.dmp

    Filesize

    64KB

  • memory/4176-23-0x0000000000FC0000-0x0000000000FC6000-memory.dmp

    Filesize

    24KB

  • memory/4176-53-0x0000000009450000-0x000000000985B000-memory.dmp

    Filesize

    4.0MB