Analysis

  • max time kernel
    146s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    02/04/2024, 10:12

General

  • Target
    a7c2b8d081407da5d72f12eeef21c11674ff616c89be40f73f114c292c09e6de.exe
  • Size 227KB
  • Sample240402-l8nfcaed61
  • SHA256 a7c2b8d081407da5d72f12eeef21c11674ff616c89be40f73f114c292c09e6de
  • MD5 SHA1 SHA512 SSDEEP

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 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 1 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).

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\a7c2b8d081407da5d72f12eeef21c11674ff616c89be40f73f114c292c09e6de.exe
    "C:\Users\Admin\AppData\Local\Temp\a7c2b8d081407da5d72f12eeef21c11674ff616c89be40f73f114c292c09e6de.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4592
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\zzqfzows\
      2⤵
        PID:3472
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\dpbgdjiw.exe" C:\Windows\SysWOW64\zzqfzows\
        2⤵
          PID:3684
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create zzqfzows binPath= "C:\Windows\SysWOW64\zzqfzows\dpbgdjiw.exe /d\"C:\Users\Admin\AppData\Local\Temp\a7c2b8d081407da5d72f12eeef21c11674ff616c89be40f73f114c292c09e6de.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3788
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description zzqfzows "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:680
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start zzqfzows
          2⤵
          • Launches sc.exe
          PID:1032
        • 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:3108
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4592 -s 1192
          2⤵
          • Program crash
          PID:1164
      • C:\Windows\SysWOW64\zzqfzows\dpbgdjiw.exe
        C:\Windows\SysWOW64\zzqfzows\dpbgdjiw.exe /d"C:\Users\Admin\AppData\Local\Temp\a7c2b8d081407da5d72f12eeef21c11674ff616c89be40f73f114c292c09e6de.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1516
        • 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:3636
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1516 -s 536
          2⤵
          • Program crash
          PID:3544
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 1516 -ip 1516
        1⤵
          PID:2436
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 4592 -ip 4592
          1⤵
            PID:5056

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

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                Downloads

                dpbgdjiw.exe

                • Path C:\Users\Admin\AppData\Local\Temp\dpbgdjiw.exe
                • Size 12.2MB
                • SHA256 8ece24897b1e7773cd8e94cdb96b36a50b4643f4965d7690479f27f9a95a1bf1
                • MD5 SHA1 SHA512 SSDEEP

                memory/1516-9-0x0000000002B70000-0x0000000002C70000-memory.dmp

                memory/1516-13-0x0000000000400000-0x0000000002B11000-memory.dmp

                memory/1516-14-0x0000000000400000-0x0000000002B11000-memory.dmp

                memory/1516-10-0x0000000002C90000-0x0000000002CA3000-memory.dmp

                memory/3636-35-0x0000000002590000-0x00000000025A0000-memory.dmp

                memory/3636-44-0x0000000002590000-0x00000000025A0000-memory.dmp

                memory/3636-59-0x00000000010E0000-0x00000000010F5000-memory.dmp

                memory/3636-15-0x00000000010E0000-0x00000000010F5000-memory.dmp

                memory/3636-23-0x0000000002E00000-0x000000000300F000-memory.dmp

                memory/3636-24-0x0000000002580000-0x0000000002586000-memory.dmp

                memory/3636-17-0x00000000010E0000-0x00000000010F5000-memory.dmp

                memory/3636-18-0x00000000010E0000-0x00000000010F5000-memory.dmp

                memory/3636-20-0x0000000002E00000-0x000000000300F000-memory.dmp

                memory/3636-39-0x0000000002590000-0x00000000025A0000-memory.dmp

                memory/3636-51-0x0000000008300000-0x000000000870B000-memory.dmp

                memory/3636-55-0x00000000037E0000-0x00000000037E7000-memory.dmp

                memory/3636-54-0x0000000008300000-0x000000000870B000-memory.dmp

                memory/3636-50-0x00000000037D0000-0x00000000037D5000-memory.dmp

                memory/3636-47-0x00000000037D0000-0x00000000037D5000-memory.dmp

                memory/3636-46-0x0000000002590000-0x00000000025A0000-memory.dmp

                memory/3636-45-0x0000000002590000-0x00000000025A0000-memory.dmp

                memory/3636-8-0x00000000010E0000-0x00000000010F5000-memory.dmp

                memory/3636-43-0x0000000002590000-0x00000000025A0000-memory.dmp

                memory/3636-42-0x0000000002590000-0x00000000025A0000-memory.dmp

                memory/3636-41-0x0000000002590000-0x00000000025A0000-memory.dmp

                memory/3636-40-0x0000000002590000-0x00000000025A0000-memory.dmp

                memory/3636-38-0x0000000002590000-0x00000000025A0000-memory.dmp

                memory/3636-37-0x0000000002590000-0x00000000025A0000-memory.dmp

                memory/3636-36-0x0000000002590000-0x00000000025A0000-memory.dmp

                memory/3636-27-0x0000000002590000-0x00000000025A0000-memory.dmp

                memory/3636-34-0x0000000002590000-0x00000000025A0000-memory.dmp

                memory/3636-33-0x0000000002590000-0x00000000025A0000-memory.dmp

                memory/3636-32-0x0000000002590000-0x00000000025A0000-memory.dmp

                memory/3636-31-0x0000000002590000-0x00000000025A0000-memory.dmp

                memory/3636-30-0x0000000002590000-0x00000000025A0000-memory.dmp

                memory/4592-2-0x0000000002C90000-0x0000000002CA3000-memory.dmp

                memory/4592-16-0x0000000000400000-0x0000000002B11000-memory.dmp

                memory/4592-1-0x0000000002D50000-0x0000000002E50000-memory.dmp

                memory/4592-4-0x0000000000400000-0x0000000002B11000-memory.dmp