Analysis

  • max time kernel
    150s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-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.

  • 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.

  • Program crash 2 IoCs
  • 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⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4836
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\nrtuezfm\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3456
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\elojiccw.exe" C:\Windows\SysWOW64\nrtuezfm\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1036
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create nrtuezfm binPath= "C:\Windows\SysWOW64\nrtuezfm\elojiccw.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:1412
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description nrtuezfm "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3460
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start nrtuezfm
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2932
    • 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:1456
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4836 -s 672
      2⤵
      • Program crash
      PID:4220
  • C:\Windows\SysWOW64\nrtuezfm\elojiccw.exe
    C:\Windows\SysWOW64\nrtuezfm\elojiccw.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:2836
    • 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:4548
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2836 -s 524
      2⤵
      • Program crash
      PID:2684
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 4836 -ip 4836
    1⤵
      PID:3252
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 2836 -ip 2836
      1⤵
        PID:912

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        Filesize

        11.0MB

        MD5

        56b7329be07a5fd5ad3b5393934dac95

        SHA1

        bfb6acaedb3fbaaf93d2283a844eb392742e14a7

        SHA256

        8c596822f4c11ad2c52db9c4139eaa523589cddf768f7a7f77fd01a713b43752

        SHA512

        e530c3611e968fa2b1a809370afe4c8aeb26b5c3ceb233dfd5a740f87e6e734f04c2629599fee4d141f787605d51c5ab059c0ee1f419081b56bbf3b7f1d3709c

      • memory/2836-12-0x0000000000400000-0x0000000000448000-memory.dmp

        Filesize

        288KB

      • memory/2836-19-0x0000000000400000-0x0000000000448000-memory.dmp

        Filesize

        288KB

      • memory/2836-13-0x0000000000400000-0x0000000000448000-memory.dmp

        Filesize

        288KB

      • memory/2836-11-0x0000000000400000-0x0000000000448000-memory.dmp

        Filesize

        288KB

      • memory/4548-46-0x00000000025D0000-0x00000000025E0000-memory.dmp

        Filesize

        64KB

      • memory/4548-44-0x00000000025D0000-0x00000000025E0000-memory.dmp

        Filesize

        64KB

      • memory/4548-24-0x0000000002E00000-0x000000000300F000-memory.dmp

        Filesize

        2.1MB

      • memory/4548-22-0x0000000002E00000-0x000000000300F000-memory.dmp

        Filesize

        2.1MB

      • memory/4548-25-0x00000000025C0000-0x00000000025C6000-memory.dmp

        Filesize

        24KB

      • memory/4548-14-0x0000000001210000-0x0000000001225000-memory.dmp

        Filesize

        84KB

      • memory/4548-16-0x0000000001210000-0x0000000001225000-memory.dmp

        Filesize

        84KB

      • memory/4548-17-0x0000000001210000-0x0000000001225000-memory.dmp

        Filesize

        84KB

      • memory/4548-28-0x00000000025D0000-0x00000000025E0000-memory.dmp

        Filesize

        64KB

      • memory/4548-56-0x00000000025F0000-0x00000000025F7000-memory.dmp

        Filesize

        28KB

      • memory/4548-55-0x0000000007E00000-0x000000000820B000-memory.dmp

        Filesize

        4.0MB

      • memory/4548-52-0x0000000007E00000-0x000000000820B000-memory.dmp

        Filesize

        4.0MB

      • memory/4548-51-0x00000000025E0000-0x00000000025E5000-memory.dmp

        Filesize

        20KB

      • memory/4548-48-0x00000000025E0000-0x00000000025E5000-memory.dmp

        Filesize

        20KB

      • memory/4548-47-0x00000000025D0000-0x00000000025E0000-memory.dmp

        Filesize

        64KB

      • memory/4548-31-0x00000000025D0000-0x00000000025E0000-memory.dmp

        Filesize

        64KB

      • memory/4548-45-0x00000000025D0000-0x00000000025E0000-memory.dmp

        Filesize

        64KB

      • memory/4548-32-0x00000000025D0000-0x00000000025E0000-memory.dmp

        Filesize

        64KB

      • memory/4548-43-0x00000000025D0000-0x00000000025E0000-memory.dmp

        Filesize

        64KB

      • memory/4548-42-0x00000000025D0000-0x00000000025E0000-memory.dmp

        Filesize

        64KB

      • memory/4548-41-0x00000000025D0000-0x00000000025E0000-memory.dmp

        Filesize

        64KB

      • memory/4548-40-0x00000000025D0000-0x00000000025E0000-memory.dmp

        Filesize

        64KB

      • memory/4548-39-0x00000000025D0000-0x00000000025E0000-memory.dmp

        Filesize

        64KB

      • memory/4548-38-0x00000000025D0000-0x00000000025E0000-memory.dmp

        Filesize

        64KB

      • memory/4548-37-0x00000000025D0000-0x00000000025E0000-memory.dmp

        Filesize

        64KB

      • memory/4548-36-0x00000000025D0000-0x00000000025E0000-memory.dmp

        Filesize

        64KB

      • memory/4548-35-0x00000000025D0000-0x00000000025E0000-memory.dmp

        Filesize

        64KB

      • memory/4548-34-0x00000000025D0000-0x00000000025E0000-memory.dmp

        Filesize

        64KB

      • memory/4548-33-0x00000000025D0000-0x00000000025E0000-memory.dmp

        Filesize

        64KB

      • memory/4836-8-0x0000000002050000-0x0000000002063000-memory.dmp

        Filesize

        76KB

      • memory/4836-1-0x00000000004C0000-0x00000000005C0000-memory.dmp

        Filesize

        1024KB

      • memory/4836-2-0x0000000002050000-0x0000000002063000-memory.dmp

        Filesize

        76KB

      • memory/4836-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/4836-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/4836-7-0x0000000000400000-0x0000000000448000-memory.dmp

        Filesize

        288KB