Analysis

  • max time kernel
    149s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17-09-2024 10:40

General

  • Target

    keulompy.exe

  • Size

    13.0MB

  • MD5

    2303196f2416629f0fe3ea16d6eb89c0

  • SHA1

    5d37ba77ce2839d3875876a2f61b3782e7d81ebb

  • SHA256

    51ac9e66490d43f06ad67e19e241b2a45489c558bc75a35f2d3403bfdc3adef4

  • SHA512

    02cbf4613104265bc8f07bb7337d4a60163e41344ca2e64b139c148d42b6711bea669305cdb6123625c4460ddcf41120650fbe3d393c618cf2766494d2a92894

  • SSDEEP

    6144:ROdTCzZzsvqZ+6PVaTkUmvK+YMdkTgdSki4TZt5IXXXXXXXXXXXXXXXXXXXXXXXX:R7g8+6PZvK+YMdk

Malware Config

Extracted

Family

tofsee

C2

svartalfheim.top

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\keulompy.exe
    "C:\Users\Admin\AppData\Local\Temp\keulompy.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3024
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\iuaocfgf\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4768
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\firccyyv.exe" C:\Windows\SysWOW64\iuaocfgf\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4588
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create iuaocfgf binPath= "C:\Windows\SysWOW64\iuaocfgf\firccyyv.exe /d\"C:\Users\Admin\AppData\Local\Temp\keulompy.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2560
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description iuaocfgf "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3984
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start iuaocfgf
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:784
    • 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:4380
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3024 -s 1032
      2⤵
      • Program crash
      PID:5016
  • C:\Windows\SysWOW64\iuaocfgf\firccyyv.exe
    C:\Windows\SysWOW64\iuaocfgf\firccyyv.exe /d"C:\Users\Admin\AppData\Local\Temp\keulompy.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:5076
    • 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:4968
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 5076 -s 528
      2⤵
      • Program crash
      PID:2500
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 3024 -ip 3024
    1⤵
      PID:2068
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 5076 -ip 5076
      1⤵
        PID:2940

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        10.8MB

        MD5

        8693747adbf5bc21e9020340fb764aaa

        SHA1

        8788aa597b22cabe0fc0f1bf2a0d59b43acd8bc7

        SHA256

        72bac2466726a93c49139e7f2f6075dd3d42bd646208a47e82f3130660da6f69

        SHA512

        779d002cb2d001dd5431f34a0f0cd97abc64ccd6366bb3721d6cf76a0a0d73cfca5998d481958c34555fb7bbd1f49a7a6e4ea6cad16e7ab604a45b24e5226903

      • memory/3024-1-0x00000000006E0000-0x00000000007E0000-memory.dmp

        Filesize

        1024KB

      • memory/3024-2-0x00000000021C0000-0x00000000021D3000-memory.dmp

        Filesize

        76KB

      • memory/3024-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/3024-10-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/3024-9-0x00000000021C0000-0x00000000021D3000-memory.dmp

        Filesize

        76KB

      • memory/3024-8-0x0000000000400000-0x000000000046E000-memory.dmp

        Filesize

        440KB

      • memory/4968-45-0x0000000001DF0000-0x0000000001E00000-memory.dmp

        Filesize

        64KB

      • memory/4968-41-0x0000000001DF0000-0x0000000001E00000-memory.dmp

        Filesize

        64KB

      • memory/4968-55-0x0000000002DE0000-0x0000000002DE7000-memory.dmp

        Filesize

        28KB

      • memory/4968-16-0x0000000000A70000-0x0000000000A85000-memory.dmp

        Filesize

        84KB

      • memory/4968-14-0x0000000000A70000-0x0000000000A85000-memory.dmp

        Filesize

        84KB

      • memory/4968-17-0x0000000000A70000-0x0000000000A85000-memory.dmp

        Filesize

        84KB

      • memory/4968-23-0x0000000002800000-0x0000000002A0F000-memory.dmp

        Filesize

        2.1MB

      • memory/4968-21-0x0000000002800000-0x0000000002A0F000-memory.dmp

        Filesize

        2.1MB

      • memory/4968-51-0x0000000007780000-0x0000000007B8B000-memory.dmp

        Filesize

        4.0MB

      • memory/4968-54-0x0000000007780000-0x0000000007B8B000-memory.dmp

        Filesize

        4.0MB

      • memory/4968-50-0x0000000002DD0000-0x0000000002DD5000-memory.dmp

        Filesize

        20KB

      • memory/4968-47-0x0000000002DD0000-0x0000000002DD5000-memory.dmp

        Filesize

        20KB

      • memory/4968-46-0x0000000001DF0000-0x0000000001E00000-memory.dmp

        Filesize

        64KB

      • memory/4968-24-0x0000000001DE0000-0x0000000001DE6000-memory.dmp

        Filesize

        24KB

      • memory/4968-44-0x0000000001DF0000-0x0000000001E00000-memory.dmp

        Filesize

        64KB

      • memory/4968-43-0x0000000001DF0000-0x0000000001E00000-memory.dmp

        Filesize

        64KB

      • memory/4968-42-0x0000000001DF0000-0x0000000001E00000-memory.dmp

        Filesize

        64KB

      • memory/4968-27-0x0000000001DF0000-0x0000000001E00000-memory.dmp

        Filesize

        64KB

      • memory/4968-40-0x0000000001DF0000-0x0000000001E00000-memory.dmp

        Filesize

        64KB

      • memory/4968-39-0x0000000001DF0000-0x0000000001E00000-memory.dmp

        Filesize

        64KB

      • memory/4968-38-0x0000000001DF0000-0x0000000001E00000-memory.dmp

        Filesize

        64KB

      • memory/4968-37-0x0000000001DF0000-0x0000000001E00000-memory.dmp

        Filesize

        64KB

      • memory/4968-36-0x0000000001DF0000-0x0000000001E00000-memory.dmp

        Filesize

        64KB

      • memory/4968-35-0x0000000001DF0000-0x0000000001E00000-memory.dmp

        Filesize

        64KB

      • memory/4968-34-0x0000000001DF0000-0x0000000001E00000-memory.dmp

        Filesize

        64KB

      • memory/4968-33-0x0000000001DF0000-0x0000000001E00000-memory.dmp

        Filesize

        64KB

      • memory/4968-32-0x0000000001DF0000-0x0000000001E00000-memory.dmp

        Filesize

        64KB

      • memory/4968-31-0x0000000001DF0000-0x0000000001E00000-memory.dmp

        Filesize

        64KB

      • memory/4968-30-0x0000000001DF0000-0x0000000001E00000-memory.dmp

        Filesize

        64KB

      • memory/5076-12-0x0000000000400000-0x000000000046E000-memory.dmp

        Filesize

        440KB

      • memory/5076-13-0x0000000000400000-0x000000000046E000-memory.dmp

        Filesize

        440KB

      • memory/5076-18-0x0000000000400000-0x000000000046E000-memory.dmp

        Filesize

        440KB

      • memory/5076-11-0x0000000000400000-0x000000000046E000-memory.dmp

        Filesize

        440KB