Analysis

  • max time kernel
    266s
  • max time network
    271s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    01-06-2024 01:37

General

  • Target

    Update.exe

  • Size

    20.4MB

  • MD5

    88246c2a001042481486e559a6d10d91

  • SHA1

    e64a646ba23b7795ec3dfb5ae4d80b02c7dd274f

  • SHA256

    4a424271b9a191afc76110e2bccd45f23cc281853f223d3e27756e16c14b5019

  • SHA512

    f3daab1877324bc8ac1f52bc9d1c7327230840fc53899aed47b69dd6b7e996cf3fde70c7efe209fa6fb9d80d58687abbd2f144a66e26de17b99b539d20f6e5ad

  • SSDEEP

    393216:XlHpZSFSVTVyVSJXSUEJRnpyQnXUWJjv0xamVNA3guo9N:9p0FmyVSNSUE7npyQnkWJjv0DV23o

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

EmmasSub

C2

85.23.24.170:4782

85.23.109.34:4782

82.128.254.93:4782

Mutex

f82c7021-f558-4f6f-bbb3-fbe420c708e5

Attributes
  • encryption_key

    4DC093FC202D016F95DCEE92AAF2874F56ACC3F2

  • install_name

    RuntimeBroker.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Windows Update

  • subdirectory

    WindowsSecureManager

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 2 IoCs
  • Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

    Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

  • Executes dropped EXE 3 IoCs
  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • Drops file in System32 directory 5 IoCs
  • Drops file in Program Files directory 8 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Checks SCSI registry key(s) 3 TTPs 3 IoCs

    SCSI information is often read in order to detect sandboxing environments.

  • Creates scheduled task(s) 1 TTPs 2 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Modifies registry class 19 IoCs
  • Suspicious behavior: EnumeratesProcesses 59 IoCs
  • Suspicious use of AdjustPrivilegeToken 8 IoCs
  • Suspicious use of FindShellTrayWindow 64 IoCs
  • Suspicious use of SendNotifyMessage 64 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 17 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

Processes

  • C:\Users\Admin\AppData\Local\Temp\Update.exe
    "C:\Users\Admin\AppData\Local\Temp\Update.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:668
    • C:\Users\Admin\AppData\Local\Temp\is-35RJD.tmp\Update.tmp
      "C:\Users\Admin\AppData\Local\Temp\is-35RJD.tmp\Update.tmp" /SL5="$501CC,20549816,832512,C:\Users\Admin\AppData\Local\Temp\Update.exe"
      2⤵
      • Executes dropped EXE
      • Drops file in Program Files directory
      • Modifies registry class
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of WriteProcessMemory
      PID:2596
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\system32\cmd.exe" /C ""C:\Program Files (x86)\MyFolder\me.bat""
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:3664
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          powershell -Command "Add-MpPreference -ExclusionProcess 'C:\WINDOWS\system32\WindowsSecureManager\RuntimeBroker.exe'"
          4⤵
          • Command and Scripting Interpreter: PowerShell
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:3484
      • C:\Program Files (x86)\MyFolder\RunMe.exe
        "C:\Program Files (x86)\MyFolder\RunMe.exe"
        3⤵
        • Executes dropped EXE
        • Drops file in System32 directory
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1696
        • C:\Windows\SYSTEM32\schtasks.exe
          "schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Windows\system32\WindowsSecureManager\RuntimeBroker.exe" /rl HIGHEST /f
          4⤵
          • Creates scheduled task(s)
          PID:2888
        • C:\Windows\system32\WindowsSecureManager\RuntimeBroker.exe
          "C:\Windows\system32\WindowsSecureManager\RuntimeBroker.exe"
          4⤵
          • Executes dropped EXE
          • Drops file in System32 directory
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of SetWindowsHookEx
          • Suspicious use of WriteProcessMemory
          PID:1020
          • C:\Windows\SYSTEM32\schtasks.exe
            "schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Windows\system32\WindowsSecureManager\RuntimeBroker.exe" /rl HIGHEST /f
            5⤵
            • Creates scheduled task(s)
            PID:2044
  • C:\Windows\System32\rundll32.exe
    C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
    1⤵
      PID:800
    • C:\Windows\system32\taskmgr.exe
      "C:\Windows\system32\taskmgr.exe" /7
      1⤵
      • Checks SCSI registry key(s)
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      PID:1164

    Network

    MITRE ATT&CK Matrix ATT&CK v13

    Execution

    Command and Scripting Interpreter

    1
    T1059

    PowerShell

    1
    T1059.001

    Scheduled Task/Job

    1
    T1053

    Persistence

    Scheduled Task/Job

    1
    T1053

    Privilege Escalation

    Scheduled Task/Job

    1
    T1053

    Discovery

    Query Registry

    3
    T1012

    System Information Discovery

    2
    T1082

    Peripheral Device Discovery

    1
    T1120

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Program Files (x86)\MyFolder\RunMe.exe
      Filesize

      3.1MB

      MD5

      392a6ea0718747e4ad443f730047715b

      SHA1

      808d682efeb32bd7f98e49b7b99350683162059e

      SHA256

      36be936ba0fc160a314bfaf9be4c8689730ad9c11c3cf6fb7d066c43a934b257

      SHA512

      b033da7b04a2dc9a342de4970ae1fe26cda4d82bd3fe4a2a2f34507675832912cc6d66456a8a846f75a705523514d4b52bbd120e7b629c3d38467d999d2e95b4

    • C:\Program Files (x86)\MyFolder\me.bat
      Filesize

      130B

      MD5

      0829830a1636e2958b07fc827cb5d3d7

      SHA1

      6051bfbf49df5f44c41f20104a079a8d0f7acb94

      SHA256

      b2fce48164d3196f4ec0d85766cb37a9dd12e5a2b478a10583d38c2561616f6b

      SHA512

      ac40f48729c6b14e3d43c55f46a12584de8e48b74473f8011071d4869fbdfac30aa27f91e73d99584b88c88e02d7a03901a168c3403566fb40c1d3198cf91755

    • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_iyfu3kmx.53y.ps1
      Filesize

      60B

      MD5

      d17fe0a3f47be24a6453e9ef58c94641

      SHA1

      6ab83620379fc69f80c0242105ddffd7d98d5d9d

      SHA256

      96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

      SHA512

      5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

    • C:\Users\Admin\AppData\Local\Temp\is-35RJD.tmp\Update.tmp
      Filesize

      3.1MB

      MD5

      6a4ac87c4331dc724e6fea16e0ab4b7e

      SHA1

      3dcab7b5fc73352c01eb24e827626670fa323cec

      SHA256

      3b9ccf0ba93ecc3640ec5637d3bcfa030c260e6a6222ac7a4bebdd0a91af9a66

      SHA512

      dc8e3c8a90cd7751f069c5e00c40abbd66a407eeea783829c82242ff9d52fa9389220aed896705dd81911a9d007d3a394cb24c7c3c1e08020bbc2d3c371a9eb6

    • memory/668-0-0x0000000000400000-0x00000000004D8000-memory.dmp
      Filesize

      864KB

    • memory/668-2-0x0000000000401000-0x00000000004B7000-memory.dmp
      Filesize

      728KB

    • memory/668-8-0x0000000000400000-0x00000000004D8000-memory.dmp
      Filesize

      864KB

    • memory/668-89-0x0000000000400000-0x00000000004D8000-memory.dmp
      Filesize

      864KB

    • memory/1020-96-0x000000001D170000-0x000000001D1C0000-memory.dmp
      Filesize

      320KB

    • memory/1020-97-0x000000001D7C0000-0x000000001D872000-memory.dmp
      Filesize

      712KB

    • memory/1020-98-0x000000001E0F0000-0x000000001E618000-memory.dmp
      Filesize

      5.2MB

    • memory/1164-109-0x000001394C270000-0x000001394C271000-memory.dmp
      Filesize

      4KB

    • memory/1164-101-0x000001394C270000-0x000001394C271000-memory.dmp
      Filesize

      4KB

    • memory/1164-111-0x000001394C270000-0x000001394C271000-memory.dmp
      Filesize

      4KB

    • memory/1164-110-0x000001394C270000-0x000001394C271000-memory.dmp
      Filesize

      4KB

    • memory/1164-105-0x000001394C270000-0x000001394C271000-memory.dmp
      Filesize

      4KB

    • memory/1164-99-0x000001394C270000-0x000001394C271000-memory.dmp
      Filesize

      4KB

    • memory/1164-100-0x000001394C270000-0x000001394C271000-memory.dmp
      Filesize

      4KB

    • memory/1164-106-0x000001394C270000-0x000001394C271000-memory.dmp
      Filesize

      4KB

    • memory/1164-107-0x000001394C270000-0x000001394C271000-memory.dmp
      Filesize

      4KB

    • memory/1164-108-0x000001394C270000-0x000001394C271000-memory.dmp
      Filesize

      4KB

    • memory/1696-85-0x00000000004D0000-0x00000000007F4000-memory.dmp
      Filesize

      3.1MB

    • memory/2596-65-0x0000000000400000-0x000000000071C000-memory.dmp
      Filesize

      3.1MB

    • memory/2596-9-0x0000000000400000-0x000000000071C000-memory.dmp
      Filesize

      3.1MB

    • memory/2596-6-0x0000000000400000-0x000000000071C000-memory.dmp
      Filesize

      3.1MB

    • memory/2596-88-0x0000000000400000-0x000000000071C000-memory.dmp
      Filesize

      3.1MB

    • memory/3484-37-0x00000000060D0000-0x0000000006136000-memory.dmp
      Filesize

      408KB

    • memory/3484-53-0x0000000006DC0000-0x0000000006DF2000-memory.dmp
      Filesize

      200KB

    • memory/3484-71-0x0000000007B10000-0x0000000007B2A000-memory.dmp
      Filesize

      104KB

    • memory/3484-72-0x0000000007BA0000-0x0000000007BAA000-memory.dmp
      Filesize

      40KB

    • memory/3484-73-0x0000000007DB0000-0x0000000007E46000-memory.dmp
      Filesize

      600KB

    • memory/3484-74-0x0000000007D30000-0x0000000007D41000-memory.dmp
      Filesize

      68KB

    • memory/3484-75-0x0000000007D60000-0x0000000007D6E000-memory.dmp
      Filesize

      56KB

    • memory/3484-76-0x0000000007D70000-0x0000000007D84000-memory.dmp
      Filesize

      80KB

    • memory/3484-77-0x0000000007E70000-0x0000000007E8A000-memory.dmp
      Filesize

      104KB

    • memory/3484-78-0x0000000007E50000-0x0000000007E58000-memory.dmp
      Filesize

      32KB

    • memory/3484-81-0x0000000073DB0000-0x0000000074560000-memory.dmp
      Filesize

      7.7MB

    • memory/3484-69-0x0000000073DB0000-0x0000000074560000-memory.dmp
      Filesize

      7.7MB

    • memory/3484-68-0x0000000073DB0000-0x0000000074560000-memory.dmp
      Filesize

      7.7MB

    • memory/3484-70-0x0000000008160000-0x00000000087DA000-memory.dmp
      Filesize

      6.5MB

    • memory/3484-67-0x00000000079E0000-0x0000000007A83000-memory.dmp
      Filesize

      652KB

    • memory/3484-64-0x0000000073DB0000-0x0000000074560000-memory.dmp
      Filesize

      7.7MB

    • memory/3484-66-0x00000000079B0000-0x00000000079CE000-memory.dmp
      Filesize

      120KB

    • memory/3484-54-0x0000000070260000-0x00000000702AC000-memory.dmp
      Filesize

      304KB

    • memory/3484-51-0x0000000006820000-0x000000000686C000-memory.dmp
      Filesize

      304KB

    • memory/3484-50-0x00000000067E0000-0x00000000067FE000-memory.dmp
      Filesize

      120KB

    • memory/3484-49-0x0000000006220000-0x0000000006574000-memory.dmp
      Filesize

      3.3MB

    • memory/3484-48-0x0000000073DB0000-0x0000000074560000-memory.dmp
      Filesize

      7.7MB

    • memory/3484-38-0x00000000061B0000-0x0000000006216000-memory.dmp
      Filesize

      408KB

    • memory/3484-36-0x0000000005FE0000-0x0000000006002000-memory.dmp
      Filesize

      136KB

    • memory/3484-35-0x00000000059B0000-0x0000000005FD8000-memory.dmp
      Filesize

      6.2MB

    • memory/3484-34-0x0000000073DB0000-0x0000000074560000-memory.dmp
      Filesize

      7.7MB

    • memory/3484-33-0x0000000003240000-0x0000000003276000-memory.dmp
      Filesize

      216KB

    • memory/3484-32-0x0000000073DBE000-0x0000000073DBF000-memory.dmp
      Filesize

      4KB