Analysis

  • max time kernel
    146s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240412-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17-04-2024 12:21

General

  • Target

    900f15042c99288aef15c9187640b625ffec568147dd761f1508e9b61cc174d7.exe

  • Size

    204KB

  • MD5

    1f57a9bb99804b8193ef503404bb7387

  • SHA1

    674710911110b4b45030b990dabb3c45fd095b3f

  • SHA256

    900f15042c99288aef15c9187640b625ffec568147dd761f1508e9b61cc174d7

  • SHA512

    d93b6d24f3fdb267a0d43195bbba3494cb2734756e5e3090cea9e65c584d66ca5eb1842bda274f484a42dac89f2fb196a2ef83e9f8e70dad4ca4b1351c3acce7

  • SSDEEP

    3072:qfrB/GLaZdXUNc8iirJiM21K7uu+5Oiq08tJz5zoy887jImQpeBNMRDx/+cmH:qfrwclVORxv5z8kI1x2co

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
  • 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\900f15042c99288aef15c9187640b625ffec568147dd761f1508e9b61cc174d7.exe
    "C:\Users\Admin\AppData\Local\Temp\900f15042c99288aef15c9187640b625ffec568147dd761f1508e9b61cc174d7.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:668
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\flxnosge\
      2⤵
        PID:4764
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\fzecxaxz.exe" C:\Windows\SysWOW64\flxnosge\
        2⤵
          PID:4272
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create flxnosge binPath= "C:\Windows\SysWOW64\flxnosge\fzecxaxz.exe /d\"C:\Users\Admin\AppData\Local\Temp\900f15042c99288aef15c9187640b625ffec568147dd761f1508e9b61cc174d7.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2848
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description flxnosge "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2308
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start flxnosge
          2⤵
          • Launches sc.exe
          PID:4672
        • 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:1576
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 668 -s 1152
          2⤵
          • Program crash
          PID:2628
      • C:\Windows\SysWOW64\flxnosge\fzecxaxz.exe
        C:\Windows\SysWOW64\flxnosge\fzecxaxz.exe /d"C:\Users\Admin\AppData\Local\Temp\900f15042c99288aef15c9187640b625ffec568147dd761f1508e9b61cc174d7.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3984
        • 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:1316
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3984 -s 516
          2⤵
          • Program crash
          PID:3584
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 3984 -ip 3984
        1⤵
          PID:976
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 504 -p 668 -ip 668
          1⤵
            PID:540

          Network

          MITRE ATT&CK Matrix ATT&CK v13

          Persistence

          Create or Modify System Process

          2
          T1543

          Windows Service

          2
          T1543.003

          Boot or Logon Autostart Execution

          1
          T1547

          Registry Run Keys / Startup Folder

          1
          T1547.001

          Privilege Escalation

          Create or Modify System Process

          2
          T1543

          Windows Service

          2
          T1543.003

          Boot or Logon Autostart Execution

          1
          T1547

          Registry Run Keys / Startup Folder

          1
          T1547.001

          Defense Evasion

          Impair Defenses

          1
          T1562

          Disable or Modify System Firewall

          1
          T1562.004

          Modify Registry

          1
          T1112

          Discovery

          Query Registry

          1
          T1012

          System Information Discovery

          2
          T1082

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          • C:\Users\Admin\AppData\Local\Temp\fzecxaxz.exe
            Filesize

            11.9MB

            MD5

            5ba66321b0e94766f8df487734d46348

            SHA1

            e04eb16d84f3259bc1102c0ebb03206c950bb8af

            SHA256

            03180981129aad1aca6684ec49102d75ed5b8917ec7fa8b60c45bbf309d0579e

            SHA512

            eaf01f50b11f38d2dca32ed5a187ab64ea2b3dd1a31c9fcaf68e3f979af903ff8b3f054340a804e6456159dd4da94cd47e9df44a2fec60cf83b5883888d5ec04

          • memory/668-16-0x0000000000400000-0x0000000000438000-memory.dmp
            Filesize

            224KB

          • memory/668-2-0x0000000000600000-0x0000000000613000-memory.dmp
            Filesize

            76KB

          • memory/668-4-0x0000000000400000-0x0000000000438000-memory.dmp
            Filesize

            224KB

          • memory/668-1-0x00000000004C0000-0x00000000005C0000-memory.dmp
            Filesize

            1024KB

          • memory/1316-33-0x0000000001DA0000-0x0000000001DB0000-memory.dmp
            Filesize

            64KB

          • memory/1316-35-0x0000000001DA0000-0x0000000001DB0000-memory.dmp
            Filesize

            64KB

          • memory/1316-59-0x00000000008D0000-0x00000000008E5000-memory.dmp
            Filesize

            84KB

          • memory/1316-14-0x00000000008D0000-0x00000000008E5000-memory.dmp
            Filesize

            84KB

          • memory/1316-55-0x00000000029D0000-0x00000000029D7000-memory.dmp
            Filesize

            28KB

          • memory/1316-54-0x0000000007500000-0x000000000790B000-memory.dmp
            Filesize

            4.0MB

          • memory/1316-17-0x00000000008D0000-0x00000000008E5000-memory.dmp
            Filesize

            84KB

          • memory/1316-18-0x00000000008D0000-0x00000000008E5000-memory.dmp
            Filesize

            84KB

          • memory/1316-20-0x0000000002600000-0x000000000280F000-memory.dmp
            Filesize

            2.1MB

          • memory/1316-23-0x0000000002600000-0x000000000280F000-memory.dmp
            Filesize

            2.1MB

          • memory/1316-24-0x0000000000BF0000-0x0000000000BF6000-memory.dmp
            Filesize

            24KB

          • memory/1316-27-0x0000000001DA0000-0x0000000001DB0000-memory.dmp
            Filesize

            64KB

          • memory/1316-30-0x0000000001DA0000-0x0000000001DB0000-memory.dmp
            Filesize

            64KB

          • memory/1316-31-0x0000000001DA0000-0x0000000001DB0000-memory.dmp
            Filesize

            64KB

          • memory/1316-32-0x0000000001DA0000-0x0000000001DB0000-memory.dmp
            Filesize

            64KB

          • memory/1316-51-0x0000000007500000-0x000000000790B000-memory.dmp
            Filesize

            4.0MB

          • memory/1316-34-0x0000000001DA0000-0x0000000001DB0000-memory.dmp
            Filesize

            64KB

          • memory/1316-10-0x00000000008D0000-0x00000000008E5000-memory.dmp
            Filesize

            84KB

          • memory/1316-36-0x0000000001DA0000-0x0000000001DB0000-memory.dmp
            Filesize

            64KB

          • memory/1316-37-0x0000000001DA0000-0x0000000001DB0000-memory.dmp
            Filesize

            64KB

          • memory/1316-38-0x0000000001DA0000-0x0000000001DB0000-memory.dmp
            Filesize

            64KB

          • memory/1316-39-0x0000000001DA0000-0x0000000001DB0000-memory.dmp
            Filesize

            64KB

          • memory/1316-40-0x0000000001DA0000-0x0000000001DB0000-memory.dmp
            Filesize

            64KB

          • memory/1316-41-0x0000000001DA0000-0x0000000001DB0000-memory.dmp
            Filesize

            64KB

          • memory/1316-42-0x0000000001DA0000-0x0000000001DB0000-memory.dmp
            Filesize

            64KB

          • memory/1316-43-0x0000000001DA0000-0x0000000001DB0000-memory.dmp
            Filesize

            64KB

          • memory/1316-44-0x0000000001DA0000-0x0000000001DB0000-memory.dmp
            Filesize

            64KB

          • memory/1316-45-0x0000000001DA0000-0x0000000001DB0000-memory.dmp
            Filesize

            64KB

          • memory/1316-46-0x0000000001DA0000-0x0000000001DB0000-memory.dmp
            Filesize

            64KB

          • memory/1316-47-0x0000000001DF0000-0x0000000001DF5000-memory.dmp
            Filesize

            20KB

          • memory/1316-50-0x0000000001DF0000-0x0000000001DF5000-memory.dmp
            Filesize

            20KB

          • memory/3984-8-0x0000000000680000-0x0000000000780000-memory.dmp
            Filesize

            1024KB

          • memory/3984-9-0x0000000000660000-0x0000000000673000-memory.dmp
            Filesize

            76KB

          • memory/3984-15-0x0000000000400000-0x0000000000438000-memory.dmp
            Filesize

            224KB

          • memory/3984-11-0x0000000000400000-0x0000000000438000-memory.dmp
            Filesize

            224KB