Analysis

  • max time kernel
    148s
  • max time network
    156s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231023-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231023-enlocale:en-usos:windows10-2004-x64system
  • submitted
    19/11/2023, 22:01

General

  • Target

    f2b4ea5a8678e6b4ff70b238e34a208f4287f113ba6a65c12592a01cf9cf17c1.exe

  • Size

    265KB

  • MD5

    695c14c51ae9ff59157cf69f97b2d1cc

  • SHA1

    4688eea11efa5c61c7704b5ca80196eb9099e867

  • SHA256

    f2b4ea5a8678e6b4ff70b238e34a208f4287f113ba6a65c12592a01cf9cf17c1

  • SHA512

    e43e45420544f2fd736f2427443941f1da5b8d4a74d4c9d2e0a95c8306b2f10e12beaa6b0c2ec2715ecbd66b41431f404c942c32720a8b3ee2afa640657d4688

  • SSDEEP

    3072:d6LaowspCAE+mYgDxv5l7Iek5Ym7IQoiteVFWbVD22WsgAsR6c7ovb3TQh9:SaWCAF5Cf7Iem57InitGMxycQMrT

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) 1 TTPs
  • Modifies Windows Firewall 1 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).

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\f2b4ea5a8678e6b4ff70b238e34a208f4287f113ba6a65c12592a01cf9cf17c1.exe
    "C:\Users\Admin\AppData\Local\Temp\f2b4ea5a8678e6b4ff70b238e34a208f4287f113ba6a65c12592a01cf9cf17c1.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1520
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\kpbrsvjh\
      2⤵
        PID:4968
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\siifrdtr.exe" C:\Windows\SysWOW64\kpbrsvjh\
        2⤵
          PID:4400
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create kpbrsvjh binPath= "C:\Windows\SysWOW64\kpbrsvjh\siifrdtr.exe /d\"C:\Users\Admin\AppData\Local\Temp\f2b4ea5a8678e6b4ff70b238e34a208f4287f113ba6a65c12592a01cf9cf17c1.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2448
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description kpbrsvjh "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4448
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start kpbrsvjh
          2⤵
          • Launches sc.exe
          PID:1888
        • 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
          PID:4164
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1520 -s 1040
          2⤵
          • Program crash
          PID:456
      • C:\Windows\SysWOW64\kpbrsvjh\siifrdtr.exe
        C:\Windows\SysWOW64\kpbrsvjh\siifrdtr.exe /d"C:\Users\Admin\AppData\Local\Temp\f2b4ea5a8678e6b4ff70b238e34a208f4287f113ba6a65c12592a01cf9cf17c1.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3504
        • 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:960
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3504 -s 532
          2⤵
          • Program crash
          PID:3068
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 476 -p 1520 -ip 1520
        1⤵
          PID:5080
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 472 -p 3504 -ip 3504
          1⤵
            PID:688

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

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                Downloads

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

                  Filesize

                  13.2MB

                  MD5

                  fdd5863dd3ba0cce0b2127a234361db6

                  SHA1

                  abcb684860814e1fba02585d2612e3d5dff8e9a1

                  SHA256

                  6bb6f114802716472088a4a05918dd319b755f282e21d89c571c0cfd5c206dc5

                  SHA512

                  a29670c37df8b8e7a5ef04f83429d94648619471752660fe99bdab74901917aaccfd6641f176887bb4e5ea4a9918b4c1873d969bed0ce8f3099b8d12b982e093

                • C:\Windows\SysWOW64\kpbrsvjh\siifrdtr.exe

                  Filesize

                  13.2MB

                  MD5

                  fdd5863dd3ba0cce0b2127a234361db6

                  SHA1

                  abcb684860814e1fba02585d2612e3d5dff8e9a1

                  SHA256

                  6bb6f114802716472088a4a05918dd319b755f282e21d89c571c0cfd5c206dc5

                  SHA512

                  a29670c37df8b8e7a5ef04f83429d94648619471752660fe99bdab74901917aaccfd6641f176887bb4e5ea4a9918b4c1873d969bed0ce8f3099b8d12b982e093

                • memory/960-54-0x0000000007C80000-0x000000000808B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/960-37-0x0000000002560000-0x0000000002570000-memory.dmp

                  Filesize

                  64KB

                • memory/960-59-0x00000000010A0000-0x00000000010B5000-memory.dmp

                  Filesize

                  84KB

                • memory/960-24-0x0000000002550000-0x0000000002556000-memory.dmp

                  Filesize

                  24KB

                • memory/960-27-0x0000000002560000-0x0000000002570000-memory.dmp

                  Filesize

                  64KB

                • memory/960-16-0x00000000010A0000-0x00000000010B5000-memory.dmp

                  Filesize

                  84KB

                • memory/960-30-0x0000000002560000-0x0000000002570000-memory.dmp

                  Filesize

                  64KB

                • memory/960-18-0x00000000010A0000-0x00000000010B5000-memory.dmp

                  Filesize

                  84KB

                • memory/960-12-0x00000000010A0000-0x00000000010B5000-memory.dmp

                  Filesize

                  84KB

                • memory/960-44-0x0000000002560000-0x0000000002570000-memory.dmp

                  Filesize

                  64KB

                • memory/960-32-0x0000000002560000-0x0000000002570000-memory.dmp

                  Filesize

                  64KB

                • memory/960-20-0x0000000002E00000-0x000000000300F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/960-23-0x0000000002E00000-0x000000000300F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/960-31-0x0000000002560000-0x0000000002570000-memory.dmp

                  Filesize

                  64KB

                • memory/960-47-0x00000000025F0000-0x00000000025F5000-memory.dmp

                  Filesize

                  20KB

                • memory/960-51-0x0000000007C80000-0x000000000808B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/960-50-0x00000000025F0000-0x00000000025F5000-memory.dmp

                  Filesize

                  20KB

                • memory/960-55-0x00000000031D0000-0x00000000031D7000-memory.dmp

                  Filesize

                  28KB

                • memory/960-33-0x0000000002560000-0x0000000002570000-memory.dmp

                  Filesize

                  64KB

                • memory/960-46-0x0000000002560000-0x0000000002570000-memory.dmp

                  Filesize

                  64KB

                • memory/960-34-0x0000000002560000-0x0000000002570000-memory.dmp

                  Filesize

                  64KB

                • memory/960-45-0x0000000002560000-0x0000000002570000-memory.dmp

                  Filesize

                  64KB

                • memory/960-43-0x0000000002560000-0x0000000002570000-memory.dmp

                  Filesize

                  64KB

                • memory/960-42-0x0000000002560000-0x0000000002570000-memory.dmp

                  Filesize

                  64KB

                • memory/960-41-0x0000000002560000-0x0000000002570000-memory.dmp

                  Filesize

                  64KB

                • memory/960-40-0x0000000002560000-0x0000000002570000-memory.dmp

                  Filesize

                  64KB

                • memory/960-39-0x0000000002560000-0x0000000002570000-memory.dmp

                  Filesize

                  64KB

                • memory/960-38-0x0000000002560000-0x0000000002570000-memory.dmp

                  Filesize

                  64KB

                • memory/960-35-0x0000000002560000-0x0000000002570000-memory.dmp

                  Filesize

                  64KB

                • memory/960-36-0x0000000002560000-0x0000000002570000-memory.dmp

                  Filesize

                  64KB

                • memory/1520-1-0x0000000000610000-0x0000000000710000-memory.dmp

                  Filesize

                  1024KB

                • memory/1520-3-0x0000000000400000-0x00000000004F6000-memory.dmp

                  Filesize

                  984KB

                • memory/1520-8-0x0000000002240000-0x0000000002253000-memory.dmp

                  Filesize

                  76KB

                • memory/1520-7-0x0000000000400000-0x00000000004F6000-memory.dmp

                  Filesize

                  984KB

                • memory/1520-2-0x0000000002240000-0x0000000002253000-memory.dmp

                  Filesize

                  76KB

                • memory/3504-11-0x0000000000400000-0x00000000004F6000-memory.dmp

                  Filesize

                  984KB

                • memory/3504-10-0x00000000007F0000-0x00000000008F0000-memory.dmp

                  Filesize

                  1024KB

                • memory/3504-17-0x0000000000400000-0x00000000004F6000-memory.dmp

                  Filesize

                  984KB