Analysis

  • max time kernel
    150s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    20-06-2024 08:29

General

  • Target

    6175a58c579f7af51d21cc02cdc2a85e6f9a9622b1134dc2b105118a82c19900.exe

  • Size

    11.8MB

  • MD5

    1115bd97b549ced1b9c74e08e534d655

  • SHA1

    274950f5a96e621e789ab887dd2218ee792937b2

  • SHA256

    6175a58c579f7af51d21cc02cdc2a85e6f9a9622b1134dc2b105118a82c19900

  • SHA512

    e12cf306376ccbc23498c7a9b1b5f5eb8a5976ad182484758187151322397e5211c25fa5829c02f6183534113630f8a11ff3e29cf51a02a2485f0750a7a48b29

  • SSDEEP

    12288:jsWR4IPuw0m+MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMn:4643w0

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
  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\6175a58c579f7af51d21cc02cdc2a85e6f9a9622b1134dc2b105118a82c19900.exe
    "C:\Users\Admin\AppData\Local\Temp\6175a58c579f7af51d21cc02cdc2a85e6f9a9622b1134dc2b105118a82c19900.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4968
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\omlctzt\
      2⤵
        PID:872
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\vhtyvbao.exe" C:\Windows\SysWOW64\omlctzt\
        2⤵
          PID:4808
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create omlctzt binPath= "C:\Windows\SysWOW64\omlctzt\vhtyvbao.exe /d\"C:\Users\Admin\AppData\Local\Temp\6175a58c579f7af51d21cc02cdc2a85e6f9a9622b1134dc2b105118a82c19900.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4900
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description omlctzt "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3948
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start omlctzt
          2⤵
          • Launches sc.exe
          PID:720
        • 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
          PID:744
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4968 -s 1040
          2⤵
          • Program crash
          PID:4608
      • C:\Windows\SysWOW64\omlctzt\vhtyvbao.exe
        C:\Windows\SysWOW64\omlctzt\vhtyvbao.exe /d"C:\Users\Admin\AppData\Local\Temp\6175a58c579f7af51d21cc02cdc2a85e6f9a9622b1134dc2b105118a82c19900.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2244
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:4944
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2244 -s 532
          2⤵
          • Program crash
          PID:1288
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 4968 -ip 4968
        1⤵
          PID:3864
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 488 -p 2244 -ip 2244
          1⤵
            PID:3464
          • 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 --no-appcompat-clear --field-trial-handle=3988,i,18168883380598738769,14202261231630113808,262144 --variations-seed-version --mojo-platform-channel-handle=1036 /prefetch:8
            1⤵
              PID:408

            Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

            Loading Replay Monitor...

            Downloads

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

              Filesize

              13.9MB

              MD5

              837f1f22c6ecf3991d42a2708fa4b4d0

              SHA1

              3ee8f5f2b33942335b1785c457cb3dde3c4db4ce

              SHA256

              b7fdfa73ca3fa9e2f17f3bb05486a0fd3668bd714500bc38b87607476b9cb9ba

              SHA512

              bb83c6fa351649f19f0017f0af6cccc04b0dd14861d434887bf6fafb79642391b3ac006daaaaaffe2bb8a6fb0ebf4337cfe8a21e7fbb9e32793e4c9cf0faac92

            • memory/2244-8-0x0000000000400000-0x000000000068D000-memory.dmp

              Filesize

              2.6MB

            • memory/2244-17-0x0000000000400000-0x000000000068D000-memory.dmp

              Filesize

              2.6MB

            • memory/2244-9-0x0000000000400000-0x000000000068D000-memory.dmp

              Filesize

              2.6MB

            • memory/4944-37-0x0000000001DF0000-0x0000000001E00000-memory.dmp

              Filesize

              64KB

            • memory/4944-13-0x0000000000A20000-0x0000000000A35000-memory.dmp

              Filesize

              84KB

            • memory/4944-48-0x0000000002BD0000-0x0000000002BD5000-memory.dmp

              Filesize

              20KB

            • memory/4944-47-0x0000000001DF0000-0x0000000001E00000-memory.dmp

              Filesize

              64KB

            • memory/4944-60-0x0000000000A20000-0x0000000000A35000-memory.dmp

              Filesize

              84KB

            • memory/4944-56-0x0000000002BE0000-0x0000000002BE7000-memory.dmp

              Filesize

              28KB

            • memory/4944-24-0x0000000002600000-0x000000000280F000-memory.dmp

              Filesize

              2.1MB

            • memory/4944-18-0x0000000000A20000-0x0000000000A35000-memory.dmp

              Filesize

              84KB

            • memory/4944-19-0x0000000000A20000-0x0000000000A35000-memory.dmp

              Filesize

              84KB

            • memory/4944-46-0x0000000001DF0000-0x0000000001E00000-memory.dmp

              Filesize

              64KB

            • memory/4944-36-0x0000000001DF0000-0x0000000001E00000-memory.dmp

              Filesize

              64KB

            • memory/4944-34-0x0000000001DF0000-0x0000000001E00000-memory.dmp

              Filesize

              64KB

            • memory/4944-22-0x0000000002600000-0x000000000280F000-memory.dmp

              Filesize

              2.1MB

            • memory/4944-52-0x0000000007600000-0x0000000007A0B000-memory.dmp

              Filesize

              4.0MB

            • memory/4944-55-0x0000000007600000-0x0000000007A0B000-memory.dmp

              Filesize

              4.0MB

            • memory/4944-51-0x0000000002BD0000-0x0000000002BD5000-memory.dmp

              Filesize

              20KB

            • memory/4944-25-0x0000000001DE0000-0x0000000001DE6000-memory.dmp

              Filesize

              24KB

            • memory/4944-45-0x0000000001DF0000-0x0000000001E00000-memory.dmp

              Filesize

              64KB

            • memory/4944-10-0x0000000000A20000-0x0000000000A35000-memory.dmp

              Filesize

              84KB

            • memory/4944-44-0x0000000001DF0000-0x0000000001E00000-memory.dmp

              Filesize

              64KB

            • memory/4944-43-0x0000000001DF0000-0x0000000001E00000-memory.dmp

              Filesize

              64KB

            • memory/4944-42-0x0000000001DF0000-0x0000000001E00000-memory.dmp

              Filesize

              64KB

            • memory/4944-41-0x0000000001DF0000-0x0000000001E00000-memory.dmp

              Filesize

              64KB

            • memory/4944-40-0x0000000001DF0000-0x0000000001E00000-memory.dmp

              Filesize

              64KB

            • memory/4944-39-0x0000000001DF0000-0x0000000001E00000-memory.dmp

              Filesize

              64KB

            • memory/4944-38-0x0000000001DF0000-0x0000000001E00000-memory.dmp

              Filesize

              64KB

            • memory/4944-28-0x0000000001DF0000-0x0000000001E00000-memory.dmp

              Filesize

              64KB

            • memory/4944-35-0x0000000001DF0000-0x0000000001E00000-memory.dmp

              Filesize

              64KB

            • memory/4944-33-0x0000000001DF0000-0x0000000001E00000-memory.dmp

              Filesize

              64KB

            • memory/4944-32-0x0000000001DF0000-0x0000000001E00000-memory.dmp

              Filesize

              64KB

            • memory/4944-31-0x0000000001DF0000-0x0000000001E00000-memory.dmp

              Filesize

              64KB

            • memory/4968-1-0x00000000008B0000-0x00000000009B0000-memory.dmp

              Filesize

              1024KB

            • memory/4968-2-0x00000000007F0000-0x0000000000803000-memory.dmp

              Filesize

              76KB

            • memory/4968-15-0x0000000000400000-0x0000000000415000-memory.dmp

              Filesize

              84KB

            • memory/4968-3-0x0000000000400000-0x0000000000415000-memory.dmp

              Filesize

              84KB

            • memory/4968-14-0x0000000000400000-0x000000000068D000-memory.dmp

              Filesize

              2.6MB