Analysis

  • max time kernel
    147s
  • max time network
    156s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240802-en
  • resource tags

    arch:x64arch:x86image:win11-20240802-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    09/09/2024, 08:48

General

  • Target

    9cc7ca2bf581e20dbe35e337991bcbdd7ed6cec3d34f71eefc41e4db12698866.exe

  • Size

    383KB

  • MD5

    a7b9d804ad2ead7a1f44135d3e54604e

  • SHA1

    522a5510602009783a7bb3eef2bcabb0cc0a37d8

  • SHA256

    9cc7ca2bf581e20dbe35e337991bcbdd7ed6cec3d34f71eefc41e4db12698866

  • SHA512

    90a844e9d807d7617b1c5482dfa64ad7b75ffd9352c8ec977ef13e772c5c10af868c74363773e4372ce0c8d6b8d8958759e6393bbfac482f2d3d2129db251f5b

  • SSDEEP

    6144:QEKJk5GefGfSmKiE6j7+JZBob0iJbY6B5fo7HEaKf:Qa5BufYw+fBobrhEL

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
  • 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.

  • 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\9cc7ca2bf581e20dbe35e337991bcbdd7ed6cec3d34f71eefc41e4db12698866.exe
    "C:\Users\Admin\AppData\Local\Temp\9cc7ca2bf581e20dbe35e337991bcbdd7ed6cec3d34f71eefc41e4db12698866.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:860
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\tpwsiyuk\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1548
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ipobjjrv.exe" C:\Windows\SysWOW64\tpwsiyuk\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3292
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create tpwsiyuk binPath= "C:\Windows\SysWOW64\tpwsiyuk\ipobjjrv.exe /d\"C:\Users\Admin\AppData\Local\Temp\9cc7ca2bf581e20dbe35e337991bcbdd7ed6cec3d34f71eefc41e4db12698866.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3120
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description tpwsiyuk "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2436
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start tpwsiyuk
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1468
    • 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:4360
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 860 -s 1236
      2⤵
      • Program crash
      PID:4532
  • C:\Windows\SysWOW64\tpwsiyuk\ipobjjrv.exe
    C:\Windows\SysWOW64\tpwsiyuk\ipobjjrv.exe /d"C:\Users\Admin\AppData\Local\Temp\9cc7ca2bf581e20dbe35e337991bcbdd7ed6cec3d34f71eefc41e4db12698866.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1028
    • 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:2856
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1028 -s 556
      2⤵
      • Program crash
      PID:3684
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 860 -ip 860
    1⤵
      PID:2088
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 1028 -ip 1028
      1⤵
        PID:4168

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        Filesize

        10.1MB

        MD5

        46689c1c0d1c07298f88e7de329a41f1

        SHA1

        a5aef7477d654331f8c621ac647b474d8f0cf957

        SHA256

        e5e5b0698118baaba532f941faf101a92561792a99a0a5a8f287e49bfcbd33f2

        SHA512

        cfe5c0e0632dba6afc3a50b8f34fa9419932e9d3fabeedc598eca11ed30487958a4726266bd44809ef22d4ef07699a7b071f10e195ba35316ac026fff95d4d29

      • memory/860-2-0x0000000002720000-0x0000000002733000-memory.dmp

        Filesize

        76KB

      • memory/860-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/860-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/860-8-0x0000000002720000-0x0000000002733000-memory.dmp

        Filesize

        76KB

      • memory/860-7-0x0000000000400000-0x0000000002478000-memory.dmp

        Filesize

        32.5MB

      • memory/860-1-0x0000000002770000-0x0000000002870000-memory.dmp

        Filesize

        1024KB

      • memory/1028-15-0x0000000000400000-0x0000000002478000-memory.dmp

        Filesize

        32.5MB

      • memory/2856-42-0x0000000001960000-0x0000000001970000-memory.dmp

        Filesize

        64KB

      • memory/2856-37-0x0000000001960000-0x0000000001970000-memory.dmp

        Filesize

        64KB

      • memory/2856-13-0x00000000004D0000-0x00000000004E5000-memory.dmp

        Filesize

        84KB

      • memory/2856-17-0x0000000002200000-0x000000000240F000-memory.dmp

        Filesize

        2.1MB

      • memory/2856-52-0x00000000027D0000-0x00000000027D7000-memory.dmp

        Filesize

        28KB

      • memory/2856-51-0x0000000007180000-0x000000000758B000-memory.dmp

        Filesize

        4.0MB

      • memory/2856-49-0x0000000007180000-0x000000000758B000-memory.dmp

        Filesize

        4.0MB

      • memory/2856-47-0x00000000019F0000-0x00000000019F5000-memory.dmp

        Filesize

        20KB

      • memory/2856-44-0x00000000019F0000-0x00000000019F5000-memory.dmp

        Filesize

        20KB

      • memory/2856-43-0x0000000001960000-0x0000000001970000-memory.dmp

        Filesize

        64KB

      • memory/2856-11-0x00000000004D0000-0x00000000004E5000-memory.dmp

        Filesize

        84KB

      • memory/2856-41-0x0000000001960000-0x0000000001970000-memory.dmp

        Filesize

        64KB

      • memory/2856-40-0x0000000001960000-0x0000000001970000-memory.dmp

        Filesize

        64KB

      • memory/2856-39-0x0000000001960000-0x0000000001970000-memory.dmp

        Filesize

        64KB

      • memory/2856-38-0x0000000001960000-0x0000000001970000-memory.dmp

        Filesize

        64KB

      • memory/2856-14-0x00000000004D0000-0x00000000004E5000-memory.dmp

        Filesize

        84KB

      • memory/2856-36-0x0000000001960000-0x0000000001970000-memory.dmp

        Filesize

        64KB

      • memory/2856-35-0x0000000001960000-0x0000000001970000-memory.dmp

        Filesize

        64KB

      • memory/2856-34-0x0000000001960000-0x0000000001970000-memory.dmp

        Filesize

        64KB

      • memory/2856-33-0x0000000001960000-0x0000000001970000-memory.dmp

        Filesize

        64KB

      • memory/2856-32-0x0000000001960000-0x0000000001970000-memory.dmp

        Filesize

        64KB

      • memory/2856-31-0x0000000001960000-0x0000000001970000-memory.dmp

        Filesize

        64KB

      • memory/2856-30-0x0000000001960000-0x0000000001970000-memory.dmp

        Filesize

        64KB

      • memory/2856-29-0x0000000001960000-0x0000000001970000-memory.dmp

        Filesize

        64KB

      • memory/2856-28-0x0000000001960000-0x0000000001970000-memory.dmp

        Filesize

        64KB

      • memory/2856-27-0x0000000001960000-0x0000000001970000-memory.dmp

        Filesize

        64KB

      • memory/2856-24-0x0000000001960000-0x0000000001970000-memory.dmp

        Filesize

        64KB

      • memory/2856-21-0x0000000001950000-0x0000000001956000-memory.dmp

        Filesize

        24KB

      • memory/2856-20-0x0000000002200000-0x000000000240F000-memory.dmp

        Filesize

        2.1MB