Overview

overview

10

Static

static

10

Client-built.exe

windows10-1703-x64

10

Resubmissions

06-06-2024 13:11

240606-qe4mpaee5t 10

Analysis

  • max time kernel
    149s
  • max time network
    136s
  • platform
    windows10-1703_x64
  • resource
    win10-20240404-en
  • resource tags

    arch:x64arch:x86image:win10-20240404-enlocale:en-usos:windows10-1703-x64system
  • submitted
    06-06-2024 13:11

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General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    552f4a82d8525747ab4ee3680835d651

  • SHA1

    bd33e81818790261ffd54071ee285306caab0205

  • SHA256

    7b913b874944d79d444810166f5f4a92f21f139b7e70d686f3a5c6533205cf6f

  • SHA512

    e8e3dad389cf03fe147e5d400fbf15f54d20f667e6954058b33df71cdbd70f464606b00d75d8cdf0e79ab836dfc2c07e40ac7db0aea0e650e61507590d2df982

  • SSDEEP

    49152:ivkt62XlaSFNWPjljiFa2RoUYImD5HOkMIoGdbEmTHHB72eh2NT:iv462XlaSFNWPjljiFXRoUYImD4kn

Score
10/10
quasaroffice04spywaretrojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.29.248:4782

Mutex

c2cf82ff-8b43-482e-ac0f-89fa99ef5ea3

Attributes
  • encryption_key

    FBD3E7AB215B216B27AF1C7871A614600A28DFC8

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Explorer Files

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

    trojanspywarequasar
  • Quasar payload 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Drops file in Windows directory 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.

    persistence
  • Modifies registry class 24 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 5 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.

    persistence

Processes

  • C:\Users\Admin\AppData\Local\Temp\Client-built.exe
    "C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2908
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Explorer Files" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:5088
    • 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:3640
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "Explorer Files" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:200
  • C:\Windows\system32\taskmgr.exe
    "C:\Windows\system32\taskmgr.exe" /4
    1⤵
    • Drops file in Windows directory
    • 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:3808
  • C:\Windows\System32\rundll32.exe
    C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
    1⤵
      PID:748

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

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

      3.1MB

      MD5

      552f4a82d8525747ab4ee3680835d651

      SHA1

      bd33e81818790261ffd54071ee285306caab0205

      SHA256

      7b913b874944d79d444810166f5f4a92f21f139b7e70d686f3a5c6533205cf6f

      SHA512

      e8e3dad389cf03fe147e5d400fbf15f54d20f667e6954058b33df71cdbd70f464606b00d75d8cdf0e79ab836dfc2c07e40ac7db0aea0e650e61507590d2df982

      Download Submit

    • memory/2908-0-0x00007FFA016F3000-0x00007FFA016F4000-memory.dmp

      Filesize

      4KB

      Download

    • memory/2908-1-0x00000000008E0000-0x0000000000C04000-memory.dmp

      Filesize

      3.1MB

      Download

    • memory/2908-2-0x00007FFA016F0000-0x00007FFA020DC000-memory.dmp

      Filesize

      9.9MB

      Download

    • memory/2908-9-0x00007FFA016F0000-0x00007FFA020DC000-memory.dmp

      Filesize

      9.9MB

      Download

    • memory/3640-10-0x00007FFA016F0000-0x00007FFA020DC000-memory.dmp

      Filesize

      9.9MB

      Download

    • memory/3640-11-0x00007FFA016F0000-0x00007FFA020DC000-memory.dmp

      Filesize

      9.9MB

      Download

    • memory/3640-12-0x000000001BB40000-0x000000001BB90000-memory.dmp

      Filesize

      320KB

      Download

    • memory/3640-13-0x000000001BC50000-0x000000001BD02000-memory.dmp

      Filesize

      712KB

      Download

    • memory/3640-19-0x00007FFA016F0000-0x00007FFA020DC000-memory.dmp

      Filesize

      9.9MB

      Download

    • memory/3640-20-0x00007FFA016F0000-0x00007FFA020DC000-memory.dmp

      Filesize

      9.9MB

      Download