Analysis

  • max time kernel
    149s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240611-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240611-enlocale:en-usos:windows10-2004-x64system
  • submitted
    20-06-2024 12:46

General

  • Target

    INFECTED/bebulnhx.exe

  • Size

    14.0MB

  • MD5

    693447e1396a1a501245dbd1d5a3b917

  • SHA1

    0b09a067c4954fcb628aee2fadaef3cebee8fcac

  • SHA256

    4e25675e277bb0214d438805c9c4656b6cbb6ceb0023d6f1d0221a8305e3796b

  • SHA512

    55e83f176c7b3b331d526124710f54b3423ac5b6ad3757eaa1ff33ccaec5d62db14d5af214df60f0529560deb3ba995866f89773f9c295b348d2ca1106ab370f

  • SSDEEP

    98304:f555555555555555555555555555555555555555555555555555555555555553:

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
  • Looks up external IP address via web service 4 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • 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\INFECTED\bebulnhx.exe
    "C:\Users\Admin\AppData\Local\Temp\INFECTED\bebulnhx.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1548
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\twtjzotm\
      2⤵
        PID:2996
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ecmnplou.exe" C:\Windows\SysWOW64\twtjzotm\
        2⤵
          PID:3896
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create twtjzotm binPath= "C:\Windows\SysWOW64\twtjzotm\ecmnplou.exe /d\"C:\Users\Admin\AppData\Local\Temp\INFECTED\bebulnhx.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:780
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description twtjzotm "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1040
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start twtjzotm
          2⤵
          • Launches sc.exe
          PID:552
        • 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:4112
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1548 -s 668
          2⤵
          • Program crash
          PID:3828
      • C:\Windows\SysWOW64\twtjzotm\ecmnplou.exe
        C:\Windows\SysWOW64\twtjzotm\ecmnplou.exe /d"C:\Users\Admin\AppData\Local\Temp\INFECTED\bebulnhx.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:888
        • 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:432
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 888 -s 560
          2⤵
          • Program crash
          PID:1828
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 432 -p 1548 -ip 1548
        1⤵
          PID:3080
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 548 -p 888 -ip 888
          1⤵
            PID:3676

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            14.4MB

            MD5

            482b0d82cbbc4ca68a915ab58fd39b25

            SHA1

            bea3c05bbd90b0fd5a8938b0ca16a2a1c8d5ec1d

            SHA256

            b0c4d83dce8a75a4d9e2fc528700a673748b14d466167ed896959c4f52cf194d

            SHA512

            7ac70b11207b6acc31bb77cc7a9b12027950c7c1d12d13cfe73ba97bd2fea9b96ff1f6bb2b6abf04447b3e42fcc905ee26cc9cc8a7125d7525a221e5585225b7

          • memory/432-46-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

            Filesize

            64KB

          • memory/432-31-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

            Filesize

            64KB

          • memory/432-22-0x0000000002400000-0x000000000260F000-memory.dmp

            Filesize

            2.1MB

          • memory/432-47-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

            Filesize

            64KB

          • memory/432-24-0x0000000002400000-0x000000000260F000-memory.dmp

            Filesize

            2.1MB

          • memory/432-25-0x0000000001B90000-0x0000000001B96000-memory.dmp

            Filesize

            24KB

          • memory/432-28-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

            Filesize

            64KB

          • memory/432-32-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

            Filesize

            64KB

          • memory/432-33-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

            Filesize

            64KB

          • memory/432-14-0x00000000006D0000-0x00000000006E5000-memory.dmp

            Filesize

            84KB

          • memory/432-16-0x00000000006D0000-0x00000000006E5000-memory.dmp

            Filesize

            84KB

          • memory/432-17-0x00000000006D0000-0x00000000006E5000-memory.dmp

            Filesize

            84KB

          • memory/432-34-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

            Filesize

            64KB

          • memory/432-45-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

            Filesize

            64KB

          • memory/432-56-0x00000000027D0000-0x00000000027D7000-memory.dmp

            Filesize

            28KB

          • memory/432-52-0x0000000007300000-0x000000000770B000-memory.dmp

            Filesize

            4.0MB

          • memory/432-51-0x0000000001BF0000-0x0000000001BF5000-memory.dmp

            Filesize

            20KB

          • memory/432-48-0x0000000001BF0000-0x0000000001BF5000-memory.dmp

            Filesize

            20KB

          • memory/432-35-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

            Filesize

            64KB

          • memory/432-55-0x0000000007300000-0x000000000770B000-memory.dmp

            Filesize

            4.0MB

          • memory/432-44-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

            Filesize

            64KB

          • memory/432-43-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

            Filesize

            64KB

          • memory/432-42-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

            Filesize

            64KB

          • memory/432-41-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

            Filesize

            64KB

          • memory/432-40-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

            Filesize

            64KB

          • memory/432-39-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

            Filesize

            64KB

          • memory/432-38-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

            Filesize

            64KB

          • memory/432-37-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

            Filesize

            64KB

          • memory/432-36-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

            Filesize

            64KB

          • memory/888-19-0x0000000000400000-0x000000000045D000-memory.dmp

            Filesize

            372KB

          • memory/888-11-0x0000000000400000-0x000000000045D000-memory.dmp

            Filesize

            372KB

          • memory/888-12-0x0000000000400000-0x000000000045D000-memory.dmp

            Filesize

            372KB

          • memory/888-13-0x0000000000400000-0x000000000045D000-memory.dmp

            Filesize

            372KB

          • memory/1548-4-0x0000000000400000-0x0000000000415000-memory.dmp

            Filesize

            84KB

          • memory/1548-2-0x0000000000630000-0x0000000000643000-memory.dmp

            Filesize

            76KB

          • memory/1548-8-0x0000000000630000-0x0000000000643000-memory.dmp

            Filesize

            76KB

          • memory/1548-9-0x0000000000400000-0x0000000000415000-memory.dmp

            Filesize

            84KB

          • memory/1548-7-0x0000000000400000-0x000000000045D000-memory.dmp

            Filesize

            372KB

          • memory/1548-1-0x0000000000460000-0x0000000000560000-memory.dmp

            Filesize

            1024KB