Analysis

  • max time kernel
    148s
  • max time network
    154s
  • 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 13:19

General

  • Target

    3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe

  • Size

    203KB

  • MD5

    e80ed6ccb333b7fc33ffc98bca43b57d

  • SHA1

    170281a608fe94eee06a9f45466f6a47bd2272e3

  • SHA256

    3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3

  • SHA512

    3209c004cebb1e2f544f7d8457175a62da8a225bc08bcbb051c240eddc610ca8e1ddfe7f6d758d2e09517030afad689b6805fc2b8b801a1f182c04369191a30d

  • SSDEEP

    3072:eafjdfYraZJXENc8uCXJiXK1K2LEpzUCV+PaIh9bwdANblLNBNKRrxbU+cmH:eafjqQ15OCyLLkCVkxbDco

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 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe
    "C:\Users\Admin\AppData\Local\Temp\3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1620
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\cttzyhi\
      2⤵
        PID:4720
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\gnqlkeey.exe" C:\Windows\SysWOW64\cttzyhi\
        2⤵
          PID:1880
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create cttzyhi binPath= "C:\Windows\SysWOW64\cttzyhi\gnqlkeey.exe /d\"C:\Users\Admin\AppData\Local\Temp\3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4080
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description cttzyhi "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4860
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start cttzyhi
          2⤵
          • Launches sc.exe
          PID:3988
        • 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:1336
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1620 -s 1172
          2⤵
          • Program crash
          PID:3276
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 1620 -ip 1620
        1⤵
          PID:1008
        • C:\Windows\SysWOW64\cttzyhi\gnqlkeey.exe
          C:\Windows\SysWOW64\cttzyhi\gnqlkeey.exe /d"C:\Users\Admin\AppData\Local\Temp\3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:3012
          • 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:3092
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3012 -s 524
            2⤵
            • Program crash
            PID:1416
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 464 -p 3012 -ip 3012
          1⤵
            PID:1160

          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\gnqlkeey.exe
            Filesize

            13.0MB

            MD5

            f71e9e1d18a0075deac12c026be2ce55

            SHA1

            13b18ed0a3b148838c9530d13c441eee61cbf6bc

            SHA256

            757640f1399383d861af9d12a82d54aea139108812dbd8fc399efbf166ef90e0

            SHA512

            ff2cd840f237d6fea920646174f76a090c8859a46d27df1144b31dd0d2a65ebd893e8533279c38385c1239a3117991ffed94e2d9a862c8f5167457efc392ec0b

          • memory/1620-2-0x0000000002180000-0x0000000002193000-memory.dmp
            Filesize

            76KB

          • memory/1620-3-0x0000000000400000-0x0000000000438000-memory.dmp
            Filesize

            224KB

          • memory/1620-6-0x0000000000400000-0x0000000000438000-memory.dmp
            Filesize

            224KB

          • memory/1620-7-0x0000000002180000-0x0000000002193000-memory.dmp
            Filesize

            76KB

          • memory/1620-1-0x00000000005D0000-0x00000000006D0000-memory.dmp
            Filesize

            1024KB

          • memory/3012-18-0x0000000000400000-0x0000000000438000-memory.dmp
            Filesize

            224KB

          • memory/3012-10-0x0000000000810000-0x0000000000910000-memory.dmp
            Filesize

            1024KB

          • memory/3012-11-0x0000000000400000-0x0000000000438000-memory.dmp
            Filesize

            224KB

          • memory/3092-34-0x0000000002910000-0x0000000002920000-memory.dmp
            Filesize

            64KB

          • memory/3092-37-0x0000000002910000-0x0000000002920000-memory.dmp
            Filesize

            64KB

          • memory/3092-17-0x0000000000A40000-0x0000000000A55000-memory.dmp
            Filesize

            84KB

          • memory/3092-15-0x0000000000A40000-0x0000000000A55000-memory.dmp
            Filesize

            84KB

          • memory/3092-20-0x0000000002600000-0x000000000280F000-memory.dmp
            Filesize

            2.1MB

          • memory/3092-23-0x0000000002600000-0x000000000280F000-memory.dmp
            Filesize

            2.1MB

          • memory/3092-24-0x0000000001DF0000-0x0000000001DF6000-memory.dmp
            Filesize

            24KB

          • memory/3092-27-0x0000000002910000-0x0000000002920000-memory.dmp
            Filesize

            64KB

          • memory/3092-30-0x0000000002910000-0x0000000002920000-memory.dmp
            Filesize

            64KB

          • memory/3092-31-0x0000000002910000-0x0000000002920000-memory.dmp
            Filesize

            64KB

          • memory/3092-32-0x0000000002910000-0x0000000002920000-memory.dmp
            Filesize

            64KB

          • memory/3092-12-0x0000000000A40000-0x0000000000A55000-memory.dmp
            Filesize

            84KB

          • memory/3092-33-0x0000000002910000-0x0000000002920000-memory.dmp
            Filesize

            64KB

          • memory/3092-35-0x0000000002910000-0x0000000002920000-memory.dmp
            Filesize

            64KB

          • memory/3092-36-0x0000000002910000-0x0000000002920000-memory.dmp
            Filesize

            64KB

          • memory/3092-16-0x0000000000A40000-0x0000000000A55000-memory.dmp
            Filesize

            84KB

          • memory/3092-38-0x0000000002910000-0x0000000002920000-memory.dmp
            Filesize

            64KB

          • memory/3092-39-0x0000000002910000-0x0000000002920000-memory.dmp
            Filesize

            64KB

          • memory/3092-40-0x0000000002910000-0x0000000002920000-memory.dmp
            Filesize

            64KB

          • memory/3092-41-0x0000000002910000-0x0000000002920000-memory.dmp
            Filesize

            64KB

          • memory/3092-42-0x0000000002910000-0x0000000002920000-memory.dmp
            Filesize

            64KB

          • memory/3092-43-0x0000000002910000-0x0000000002920000-memory.dmp
            Filesize

            64KB

          • memory/3092-44-0x0000000002910000-0x0000000002920000-memory.dmp
            Filesize

            64KB

          • memory/3092-45-0x0000000002910000-0x0000000002920000-memory.dmp
            Filesize

            64KB

          • memory/3092-46-0x0000000002910000-0x0000000002920000-memory.dmp
            Filesize

            64KB

          • memory/3092-47-0x0000000002BE0000-0x0000000002BE5000-memory.dmp
            Filesize

            20KB

          • memory/3092-50-0x0000000002BE0000-0x0000000002BE5000-memory.dmp
            Filesize

            20KB

          • memory/3092-51-0x0000000007600000-0x0000000007A0B000-memory.dmp
            Filesize

            4.0MB

          • memory/3092-54-0x0000000007600000-0x0000000007A0B000-memory.dmp
            Filesize

            4.0MB

          • memory/3092-55-0x0000000002BF0000-0x0000000002BF7000-memory.dmp
            Filesize

            28KB

          • memory/3092-59-0x0000000000A40000-0x0000000000A55000-memory.dmp
            Filesize

            84KB