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
    08-09-2024 01:42

General

  • Target

    c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe

  • Size

    213KB

  • MD5

    8e456f932787fcd0cadbb598174575b2

  • SHA1

    22b069c76b86bdb6be8cdafc78019b55c583062e

  • SHA256

    c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5

  • SHA512

    cb26a33dacdcfe804bdd587ecd44b9bf1c59f357e8701fc4f5e1b04d8d8882466c7743fac51969fe8912e1197a5653986eb4a71edc35eee89051b6c98d546c9d

  • SSDEEP

    6144:MGDLD6Tj3Vyg0mwiRjaVlodEFjvn/Mq0Vdh1HQ:M+L2n3VygtzRWJjv+Vdz

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.

  • 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 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe
    "C:\Users\Admin\AppData\Local\Temp\c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4664
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\tmaqzbol\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3584
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ombjcsnj.exe" C:\Windows\SysWOW64\tmaqzbol\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4752
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create tmaqzbol binPath= "C:\Windows\SysWOW64\tmaqzbol\ombjcsnj.exe /d\"C:\Users\Admin\AppData\Local\Temp\c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1832
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description tmaqzbol "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3680
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start tmaqzbol
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3068
    • 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:3600
  • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
    "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --field-trial-handle=3964,i,15436195446242760253,4000484513008731869,262144 --variations-seed-version --mojo-platform-channel-handle=4216 /prefetch:8
    1⤵
      PID:3752
    • C:\Windows\SysWOW64\tmaqzbol\ombjcsnj.exe
      C:\Windows\SysWOW64\tmaqzbol\ombjcsnj.exe /d"C:\Users\Admin\AppData\Local\Temp\c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of SetThreadContext
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:3912
      • C:\Windows\SysWOW64\svchost.exe
        svchost.exe
        2⤵
        • Sets service image path in registry
        • Drops file in System32 directory
        • System Location Discovery: System Language Discovery
        • Modifies data under HKEY_USERS
        PID:2840

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

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

      Filesize

      14.1MB

      MD5

      40d2e6e22596f8baf36f91d4f7d720bd

      SHA1

      90615e59eff358db76018c00d7bc184fd401059f

      SHA256

      5ba038457df08dd1922dcf7e58d73890fd51829e67d85291b5b2ba1fc6c9c163

      SHA512

      c1b817f948bfa539ff58d70350f2f9ce0d329eff07caf11da6d9a2073370d89e8c333c1c26fad6dc0a83e1893c0dc6c3fbd63890bbbfb713ad6c539b06ec3602

    • memory/2840-50-0x0000000002580000-0x0000000002590000-memory.dmp

      Filesize

      64KB

    • memory/2840-41-0x0000000002580000-0x0000000002590000-memory.dmp

      Filesize

      64KB

    • memory/2840-27-0x0000000002E00000-0x000000000300F000-memory.dmp

      Filesize

      2.1MB

    • memory/2840-51-0x00000000025D0000-0x00000000025D5000-memory.dmp

      Filesize

      20KB

    • memory/2840-31-0x0000000002580000-0x0000000002590000-memory.dmp

      Filesize

      64KB

    • memory/2840-34-0x0000000002580000-0x0000000002590000-memory.dmp

      Filesize

      64KB

    • memory/2840-35-0x0000000002580000-0x0000000002590000-memory.dmp

      Filesize

      64KB

    • memory/2840-37-0x0000000002580000-0x0000000002590000-memory.dmp

      Filesize

      64KB

    • memory/2840-38-0x0000000002580000-0x0000000002590000-memory.dmp

      Filesize

      64KB

    • memory/2840-14-0x0000000000FC0000-0x0000000000FD5000-memory.dmp

      Filesize

      84KB

    • memory/2840-39-0x0000000002580000-0x0000000002590000-memory.dmp

      Filesize

      64KB

    • memory/2840-18-0x0000000000FC0000-0x0000000000FD5000-memory.dmp

      Filesize

      84KB

    • memory/2840-19-0x0000000000FC0000-0x0000000000FD5000-memory.dmp

      Filesize

      84KB

    • memory/2840-49-0x0000000002580000-0x0000000002590000-memory.dmp

      Filesize

      64KB

    • memory/2840-55-0x0000000007E00000-0x000000000820B000-memory.dmp

      Filesize

      4.0MB

    • memory/2840-59-0x00000000025E0000-0x00000000025E7000-memory.dmp

      Filesize

      28KB

    • memory/2840-58-0x0000000007E00000-0x000000000820B000-memory.dmp

      Filesize

      4.0MB

    • memory/2840-54-0x00000000025D0000-0x00000000025D5000-memory.dmp

      Filesize

      20KB

    • memory/2840-28-0x0000000002570000-0x0000000002576000-memory.dmp

      Filesize

      24KB

    • memory/2840-36-0x0000000002580000-0x0000000002590000-memory.dmp

      Filesize

      64KB

    • memory/2840-24-0x0000000002E00000-0x000000000300F000-memory.dmp

      Filesize

      2.1MB

    • memory/2840-48-0x0000000002580000-0x0000000002590000-memory.dmp

      Filesize

      64KB

    • memory/2840-47-0x0000000002580000-0x0000000002590000-memory.dmp

      Filesize

      64KB

    • memory/2840-46-0x0000000002580000-0x0000000002590000-memory.dmp

      Filesize

      64KB

    • memory/2840-45-0x0000000002580000-0x0000000002590000-memory.dmp

      Filesize

      64KB

    • memory/2840-44-0x0000000002580000-0x0000000002590000-memory.dmp

      Filesize

      64KB

    • memory/2840-43-0x0000000002580000-0x0000000002590000-memory.dmp

      Filesize

      64KB

    • memory/2840-42-0x0000000002580000-0x0000000002590000-memory.dmp

      Filesize

      64KB

    • memory/2840-40-0x0000000002580000-0x0000000002590000-memory.dmp

      Filesize

      64KB

    • memory/3912-16-0x0000000000400000-0x000000000043C000-memory.dmp

      Filesize

      240KB

    • memory/3912-13-0x0000000000400000-0x000000000043C000-memory.dmp

      Filesize

      240KB

    • memory/3912-11-0x0000000000400000-0x000000000043C000-memory.dmp

      Filesize

      240KB

    • memory/4664-3-0x0000000000400000-0x0000000000415000-memory.dmp

      Filesize

      84KB

    • memory/4664-10-0x00000000006A0000-0x00000000006B3000-memory.dmp

      Filesize

      76KB

    • memory/4664-1-0x0000000000700000-0x0000000000800000-memory.dmp

      Filesize

      1024KB

    • memory/4664-12-0x0000000000400000-0x0000000000415000-memory.dmp

      Filesize

      84KB

    • memory/4664-7-0x0000000000400000-0x000000000043C000-memory.dmp

      Filesize

      240KB

    • memory/4664-8-0x0000000000700000-0x0000000000800000-memory.dmp

      Filesize

      1024KB

    • memory/4664-2-0x00000000006A0000-0x00000000006B3000-memory.dmp

      Filesize

      76KB