Analysis

  • max time kernel
    147s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    11-05-2024 08:17

General

  • Target

    dc126faa29a2e26dbd95134059e682c28afee0e1a3d2573584c8226d838f735d.exe

  • Size

    11.1MB

  • MD5

    0ad58678a408902fd64f7af414738868

  • SHA1

    c3f7da6f93660d26259ceafb4c4d13cb7160455e

  • SHA256

    dc126faa29a2e26dbd95134059e682c28afee0e1a3d2573584c8226d838f735d

  • SHA512

    2f441ca748ec8cd9e94a6759979caa64c30c1d10ba6931cf36288dd65596bc9445dec79d2b47bf3e2d9e82358a5ca05574513123c49f0eba23470585d3e68e54

  • SSDEEP

    12288:mSpmG/1+U3VGAnqy5iXBhULiprrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr:L/1+U3Q6ixyLi

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
  • 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\dc126faa29a2e26dbd95134059e682c28afee0e1a3d2573584c8226d838f735d.exe
    "C:\Users\Admin\AppData\Local\Temp\dc126faa29a2e26dbd95134059e682c28afee0e1a3d2573584c8226d838f735d.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1592
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\vilvmulm\
      2⤵
        PID:2824
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\lualjyq.exe" C:\Windows\SysWOW64\vilvmulm\
        2⤵
          PID:2200
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create vilvmulm binPath= "C:\Windows\SysWOW64\vilvmulm\lualjyq.exe /d\"C:\Users\Admin\AppData\Local\Temp\dc126faa29a2e26dbd95134059e682c28afee0e1a3d2573584c8226d838f735d.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3340
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description vilvmulm "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:700
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start vilvmulm
          2⤵
          • Launches sc.exe
          PID:1044
        • 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:4640
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1592 -s 1208
          2⤵
          • Program crash
          PID:4136
      • C:\Windows\SysWOW64\vilvmulm\lualjyq.exe
        C:\Windows\SysWOW64\vilvmulm\lualjyq.exe /d"C:\Users\Admin\AppData\Local\Temp\dc126faa29a2e26dbd95134059e682c28afee0e1a3d2573584c8226d838f735d.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2556
        • 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:4004
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2556 -s 512
          2⤵
          • Program crash
          PID:3452
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 1592 -ip 1592
        1⤵
          PID:2872
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 424 -p 2556 -ip 2556
          1⤵
            PID:1516

          Network

          MITRE ATT&CK Matrix ATT&CK v13

          Execution

          System Services

          1
          T1569

          Service Execution

          1
          T1569.002

          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\lualjyq.exe
            Filesize

            11.7MB

            MD5

            e8dcc4805320805d0c6648aa5e43936d

            SHA1

            f313d753820adb75c32eaba1c28a7c2f6a11a45d

            SHA256

            f4ac8e3879a806f1818eba95c88c51d39a0419e943a84b6d03d68495f4f00066

            SHA512

            038df23817ec829629373ca19a5da3dddf8d2170370e1851b7a23470ea5e47fff0cc6ce489e905b1cd452d92b34f46229dea5e7e91d5bdcd888b86a6a6e31c1b

          • memory/1592-2-0x0000000000570000-0x0000000000583000-memory.dmp
            Filesize

            76KB

          • memory/1592-1-0x0000000000590000-0x0000000000690000-memory.dmp
            Filesize

            1024KB

          • memory/1592-3-0x0000000000400000-0x0000000000415000-memory.dmp
            Filesize

            84KB

          • memory/1592-14-0x0000000000400000-0x0000000000415000-memory.dmp
            Filesize

            84KB

          • memory/1592-13-0x0000000000400000-0x00000000004DA000-memory.dmp
            Filesize

            872KB

          • memory/2556-16-0x0000000000400000-0x00000000004DA000-memory.dmp
            Filesize

            872KB

          • memory/2556-9-0x0000000000400000-0x00000000004DA000-memory.dmp
            Filesize

            872KB

          • memory/2556-10-0x0000000000400000-0x00000000004DA000-memory.dmp
            Filesize

            872KB

          • memory/2556-8-0x0000000000400000-0x00000000004DA000-memory.dmp
            Filesize

            872KB

          • memory/4004-54-0x0000000007600000-0x0000000007A0B000-memory.dmp
            Filesize

            4.0MB

          • memory/4004-41-0x0000000002910000-0x0000000002920000-memory.dmp
            Filesize

            64KB

          • memory/4004-18-0x0000000000A40000-0x0000000000A55000-memory.dmp
            Filesize

            84KB

          • memory/4004-55-0x0000000002BF0000-0x0000000002BF7000-memory.dmp
            Filesize

            28KB

          • memory/4004-52-0x0000000007600000-0x0000000007A0B000-memory.dmp
            Filesize

            4.0MB

          • memory/4004-34-0x0000000002910000-0x0000000002920000-memory.dmp
            Filesize

            64KB

          • memory/4004-21-0x0000000002600000-0x000000000280F000-memory.dmp
            Filesize

            2.1MB

          • memory/4004-50-0x0000000002BE0000-0x0000000002BE5000-memory.dmp
            Filesize

            20KB

          • memory/4004-11-0x0000000000A40000-0x0000000000A55000-memory.dmp
            Filesize

            84KB

          • memory/4004-46-0x0000000002910000-0x0000000002920000-memory.dmp
            Filesize

            64KB

          • memory/4004-47-0x0000000002BE0000-0x0000000002BE5000-memory.dmp
            Filesize

            20KB

          • memory/4004-45-0x0000000002910000-0x0000000002920000-memory.dmp
            Filesize

            64KB

          • memory/4004-44-0x0000000002910000-0x0000000002920000-memory.dmp
            Filesize

            64KB

          • memory/4004-43-0x0000000002910000-0x0000000002920000-memory.dmp
            Filesize

            64KB

          • memory/4004-42-0x0000000002910000-0x0000000002920000-memory.dmp
            Filesize

            64KB

          • memory/4004-17-0x0000000000A40000-0x0000000000A55000-memory.dmp
            Filesize

            84KB

          • memory/4004-40-0x0000000002910000-0x0000000002920000-memory.dmp
            Filesize

            64KB

          • memory/4004-39-0x0000000002910000-0x0000000002920000-memory.dmp
            Filesize

            64KB

          • memory/4004-38-0x0000000002910000-0x0000000002920000-memory.dmp
            Filesize

            64KB

          • memory/4004-37-0x0000000002910000-0x0000000002920000-memory.dmp
            Filesize

            64KB

          • memory/4004-36-0x0000000002910000-0x0000000002920000-memory.dmp
            Filesize

            64KB

          • memory/4004-35-0x0000000002910000-0x0000000002920000-memory.dmp
            Filesize

            64KB

          • memory/4004-33-0x0000000002910000-0x0000000002920000-memory.dmp
            Filesize

            64KB

          • memory/4004-32-0x0000000002910000-0x0000000002920000-memory.dmp
            Filesize

            64KB

          • memory/4004-31-0x0000000002910000-0x0000000002920000-memory.dmp
            Filesize

            64KB

          • memory/4004-30-0x0000000002910000-0x0000000002920000-memory.dmp
            Filesize

            64KB

          • memory/4004-28-0x0000000002910000-0x0000000002920000-memory.dmp
            Filesize

            64KB

          • memory/4004-24-0x0000000000BF0000-0x0000000000BF6000-memory.dmp
            Filesize

            24KB

          • memory/4004-23-0x0000000002600000-0x000000000280F000-memory.dmp
            Filesize

            2.1MB