Analysis

  • max time kernel
    149s
  • max time network
    150s
  • 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 21:11

General

  • Target

    MainBuild.exe

  • Size

    3.1MB

  • MD5

    3bbe6fc1601a30703de700e53c6f072f

  • SHA1

    e59be8b17dde867d5dd52d563f6c115149f4473a

  • SHA256

    96e859dad002f1e69e810c5f6ac60926f71a5ec03b4a7bde6cb9935f2927fbc3

  • SHA512

    197a18f9d5d01cee50c160450b23e60b3a770e4140462b032efe44cfd9e9b2a6fa513ada7bef341624e20fd6760ca1e492de4fd2b359da660735dafc518c3ce0

  • SSDEEP

    49152:Gvkt62XlaSFNWPjljiFa2RoUYIYxrEDkGk/JxfoGdOTHHB72eh2NT:Gv462XlaSFNWPjljiFXRoUYIYx31

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.56.1:4782

Mutex

25d56285-d107-418c-8a2b-195563744f12

Attributes
  • encryption_key

    612E594137626EF1C1C6346882A826EBAFFC773E

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    System 32

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 2 IoCs
  • Executes dropped EXE 2 IoCs
  • 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 5 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 6 IoCs
  • Suspicious use of FindShellTrayWindow 64 IoCs
  • Suspicious use of SendNotifyMessage 64 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 6 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\MainBuild.exe
    "C:\Users\Admin\AppData\Local\Temp\MainBuild.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3156
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "System 32" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:4700
    • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:2848
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "System 32" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:944
  • C:\Windows\system32\taskmgr.exe
    "C:\Windows\system32\taskmgr.exe" /7
    1⤵
    • Checks SCSI registry key(s)
    • Modifies registry class
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious behavior: GetForegroundWindowSpam
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of SendNotifyMessage
    PID:4904
  • C:\Windows\System32\rundll32.exe
    C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
    1⤵
      PID:4248
    • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:4608

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

      Filesize

      3.1MB

      MD5

      3bbe6fc1601a30703de700e53c6f072f

      SHA1

      e59be8b17dde867d5dd52d563f6c115149f4473a

      SHA256

      96e859dad002f1e69e810c5f6ac60926f71a5ec03b4a7bde6cb9935f2927fbc3

      SHA512

      197a18f9d5d01cee50c160450b23e60b3a770e4140462b032efe44cfd9e9b2a6fa513ada7bef341624e20fd6760ca1e492de4fd2b359da660735dafc518c3ce0

    • memory/2848-14-0x00007FFD41C20000-0x00007FFD426E1000-memory.dmp

      Filesize

      10.8MB

    • memory/2848-13-0x000000001C090000-0x000000001C142000-memory.dmp

      Filesize

      712KB

    • memory/2848-16-0x000000001C9C0000-0x000000001CEE8000-memory.dmp

      Filesize

      5.2MB

    • memory/2848-10-0x00007FFD41C20000-0x00007FFD426E1000-memory.dmp

      Filesize

      10.8MB

    • memory/2848-11-0x000000001B760000-0x000000001B770000-memory.dmp

      Filesize

      64KB

    • memory/2848-15-0x000000001B760000-0x000000001B770000-memory.dmp

      Filesize

      64KB

    • memory/2848-12-0x000000001B6F0000-0x000000001B740000-memory.dmp

      Filesize

      320KB

    • memory/3156-2-0x000000001B5B0000-0x000000001B5C0000-memory.dmp

      Filesize

      64KB

    • memory/3156-1-0x00007FFD41C20000-0x00007FFD426E1000-memory.dmp

      Filesize

      10.8MB

    • memory/3156-9-0x00007FFD41C20000-0x00007FFD426E1000-memory.dmp

      Filesize

      10.8MB

    • memory/3156-0-0x00000000006B0000-0x00000000009D4000-memory.dmp

      Filesize

      3.1MB

    • memory/4608-34-0x00007FFD41C20000-0x00007FFD426E1000-memory.dmp

      Filesize

      10.8MB

    • memory/4608-37-0x00007FFD41C20000-0x00007FFD426E1000-memory.dmp

      Filesize

      10.8MB

    • memory/4608-35-0x000000001B2C0000-0x000000001B2D0000-memory.dmp

      Filesize

      64KB

    • memory/4904-18-0x0000019A87830000-0x0000019A87831000-memory.dmp

      Filesize

      4KB

    • memory/4904-25-0x0000019A87830000-0x0000019A87831000-memory.dmp

      Filesize

      4KB

    • memory/4904-28-0x0000019A87830000-0x0000019A87831000-memory.dmp

      Filesize

      4KB

    • memory/4904-29-0x0000019A87830000-0x0000019A87831000-memory.dmp

      Filesize

      4KB

    • memory/4904-27-0x0000019A87830000-0x0000019A87831000-memory.dmp

      Filesize

      4KB

    • memory/4904-26-0x0000019A87830000-0x0000019A87831000-memory.dmp

      Filesize

      4KB

    • memory/4904-30-0x0000019A87830000-0x0000019A87831000-memory.dmp

      Filesize

      4KB

    • memory/4904-24-0x0000019A87830000-0x0000019A87831000-memory.dmp

      Filesize

      4KB

    • memory/4904-20-0x0000019A87830000-0x0000019A87831000-memory.dmp

      Filesize

      4KB

    • memory/4904-19-0x0000019A87830000-0x0000019A87831000-memory.dmp

      Filesize

      4KB