Analysis

  • max time kernel
    148s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231020-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231020-enlocale:en-usos:windows10-2004-x64system
  • submitted
    05/11/2023, 09:06

General

  • Target

    file.exe

  • Size

    272KB

  • MD5

    fee0ff5c08cfec7096612df413966b32

  • SHA1

    b50ea1884eb3192031eca229f3d3dc3334d82902

  • SHA256

    e9b08e0dd330ea6a2244220dc04f7dec992c83cba8ab1e60e165850d69f5e3e4

  • SHA512

    55ccede54df0f3e9c5f82b60b8a910e57737682b1413cfc842dc11c7054505dedaec478f082db35ab566d49a75ea13d787b53a2888f0332350207b1c661f8c0e

  • SSDEEP

    3072:2VX8hrkLdqiqKwK5u5gF8FHAbAM6A0gpVhP5VWZVnU+:+8xkLcPSu5C8JDM6AFP9WZ5

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 4 IoCs
  • GoLang User-Agent 1 IoCs

    Uses default user-agent string defined by GoLang HTTP packages.

  • Modifies data under HKEY_USERS 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2040
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\yagkhtel\
      2⤵
        PID:4876
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\nqngxztj.exe" C:\Windows\SysWOW64\yagkhtel\
        2⤵
          PID:3468
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create yagkhtel binPath= "C:\Windows\SysWOW64\yagkhtel\nqngxztj.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3880
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description yagkhtel "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4972
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start yagkhtel
          2⤵
          • Launches sc.exe
          PID:4644
        • 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:3572
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2040 -s 676
          2⤵
          • Program crash
          PID:2056
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2040 -s 1212
          2⤵
          • Program crash
          PID:2800
      • C:\Windows\SysWOW64\yagkhtel\nqngxztj.exe
        C:\Windows\SysWOW64\yagkhtel\nqngxztj.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1976
        • 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:2992
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1976 -s 520
          2⤵
          • Program crash
          PID:4412
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1976 -s 540
          2⤵
          • Program crash
          PID:3448
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 412 -p 2040 -ip 2040
        1⤵
          PID:5112
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 440 -p 1976 -ip 1976
          1⤵
            PID:1000
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -pss -s 440 -p 2040 -ip 2040
            1⤵
              PID:3584
            • C:\Windows\SysWOW64\WerFault.exe
              C:\Windows\SysWOW64\WerFault.exe -pss -s 544 -p 1976 -ip 1976
              1⤵
                PID:2580

              Network

                    MITRE ATT&CK Enterprise v15

                    Replay Monitor

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                    Downloads

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

                      Filesize

                      10.9MB

                      MD5

                      5fbc264bcda2f49accf4b32a579ce147

                      SHA1

                      a31ccb5950890a8ff12e8a2fab0963eb16a392de

                      SHA256

                      62cfed1b88ff4acf3c94e9148843024072e5df960a46172a77d61b4cd0fd4e77

                      SHA512

                      e36deb45b23b3f0b0040b750cde302edc84c4fb5931f586bb3b9d30bc0f19a0b6553449e6de03c01e57d740f7b74e84dea8cf618a8c7b51965541120b85fe215

                    • C:\Windows\SysWOW64\yagkhtel\nqngxztj.exe

                      Filesize

                      10.9MB

                      MD5

                      5fbc264bcda2f49accf4b32a579ce147

                      SHA1

                      a31ccb5950890a8ff12e8a2fab0963eb16a392de

                      SHA256

                      62cfed1b88ff4acf3c94e9148843024072e5df960a46172a77d61b4cd0fd4e77

                      SHA512

                      e36deb45b23b3f0b0040b750cde302edc84c4fb5931f586bb3b9d30bc0f19a0b6553449e6de03c01e57d740f7b74e84dea8cf618a8c7b51965541120b85fe215

                    • memory/1976-8-0x0000000000660000-0x0000000000760000-memory.dmp

                      Filesize

                      1024KB

                    • memory/1976-9-0x0000000000590000-0x00000000005A3000-memory.dmp

                      Filesize

                      76KB

                    • memory/1976-11-0x0000000000400000-0x00000000004F7000-memory.dmp

                      Filesize

                      988KB

                    • memory/1976-16-0x0000000000400000-0x00000000004F7000-memory.dmp

                      Filesize

                      988KB

                    • memory/2040-15-0x0000000000400000-0x00000000004F7000-memory.dmp

                      Filesize

                      988KB

                    • memory/2040-2-0x0000000000690000-0x00000000006A3000-memory.dmp

                      Filesize

                      76KB

                    • memory/2040-3-0x0000000000400000-0x00000000004F7000-memory.dmp

                      Filesize

                      988KB

                    • memory/2040-1-0x0000000000780000-0x0000000000880000-memory.dmp

                      Filesize

                      1024KB

                    • memory/2992-32-0x0000000002210000-0x0000000002220000-memory.dmp

                      Filesize

                      64KB

                    • memory/2992-37-0x0000000002210000-0x0000000002220000-memory.dmp

                      Filesize

                      64KB

                    • memory/2992-17-0x0000000000130000-0x0000000000145000-memory.dmp

                      Filesize

                      84KB

                    • memory/2992-18-0x0000000000130000-0x0000000000145000-memory.dmp

                      Filesize

                      84KB

                    • memory/2992-20-0x0000000000130000-0x0000000000145000-memory.dmp

                      Filesize

                      84KB

                    • memory/2992-21-0x0000000002000000-0x000000000220F000-memory.dmp

                      Filesize

                      2.1MB

                    • memory/2992-24-0x0000000002000000-0x000000000220F000-memory.dmp

                      Filesize

                      2.1MB

                    • memory/2992-25-0x00000000001F0000-0x00000000001F6000-memory.dmp

                      Filesize

                      24KB

                    • memory/2992-28-0x0000000002210000-0x0000000002220000-memory.dmp

                      Filesize

                      64KB

                    • memory/2992-31-0x0000000002210000-0x0000000002220000-memory.dmp

                      Filesize

                      64KB

                    • memory/2992-10-0x0000000000130000-0x0000000000145000-memory.dmp

                      Filesize

                      84KB

                    • memory/2992-33-0x0000000002210000-0x0000000002220000-memory.dmp

                      Filesize

                      64KB

                    • memory/2992-34-0x0000000002210000-0x0000000002220000-memory.dmp

                      Filesize

                      64KB

                    • memory/2992-35-0x0000000002210000-0x0000000002220000-memory.dmp

                      Filesize

                      64KB

                    • memory/2992-36-0x0000000002210000-0x0000000002220000-memory.dmp

                      Filesize

                      64KB

                    • memory/2992-14-0x0000000000130000-0x0000000000145000-memory.dmp

                      Filesize

                      84KB

                    • memory/2992-38-0x0000000002210000-0x0000000002220000-memory.dmp

                      Filesize

                      64KB

                    • memory/2992-39-0x0000000002210000-0x0000000002220000-memory.dmp

                      Filesize

                      64KB

                    • memory/2992-40-0x0000000002210000-0x0000000002220000-memory.dmp

                      Filesize

                      64KB

                    • memory/2992-41-0x0000000002210000-0x0000000002220000-memory.dmp

                      Filesize

                      64KB

                    • memory/2992-43-0x0000000002210000-0x0000000002220000-memory.dmp

                      Filesize

                      64KB

                    • memory/2992-42-0x0000000002210000-0x0000000002220000-memory.dmp

                      Filesize

                      64KB

                    • memory/2992-44-0x0000000002210000-0x0000000002220000-memory.dmp

                      Filesize

                      64KB

                    • memory/2992-45-0x0000000002210000-0x0000000002220000-memory.dmp

                      Filesize

                      64KB

                    • memory/2992-46-0x0000000002210000-0x0000000002220000-memory.dmp

                      Filesize

                      64KB

                    • memory/2992-47-0x0000000002210000-0x0000000002220000-memory.dmp

                      Filesize

                      64KB

                    • memory/2992-48-0x00000000023E0000-0x00000000023E5000-memory.dmp

                      Filesize

                      20KB

                    • memory/2992-51-0x00000000023E0000-0x00000000023E5000-memory.dmp

                      Filesize

                      20KB

                    • memory/2992-52-0x0000000006F00000-0x000000000730B000-memory.dmp

                      Filesize

                      4.0MB

                    • memory/2992-55-0x0000000006F00000-0x000000000730B000-memory.dmp

                      Filesize

                      4.0MB

                    • memory/2992-56-0x00000000023F0000-0x00000000023F7000-memory.dmp

                      Filesize

                      28KB