Analysis

  • max time kernel
    93s
  • max time network
    102s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    02-11-2024 11:39

General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    96dbf079644fad007ddee4a898bdb096

  • SHA1

    3eec62ed768ce4a1181f00a0dd6cca3564e1f9f1

  • SHA256

    3b3900adf2232fb5a995c9f6884feededfbe4a862a076ac3af936e4b5a858887

  • SHA512

    356a13c7ab5bb02ee79a2ff9525f0f8ca832302fba37cf140af8264d31933a00745b59d7f742a42ef0576964f6e112580430996ac068f63c4112907c69471385

  • SSDEEP

    49152:KvDI22SsaNYfdPBldt698dBcjHEpSu1J/goGdXTHHB72eh2NT:Kv822SsaNYfdPBldt6+dBcjHEpSJ

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.0.102:4782

Mutex

a84f48f3-00c9-414a-a093-49d616e432d3

Attributes
  • encryption_key

    D440572F816847D4B5AD6EAA65627B5DFFF00151

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Quasar Client Startup

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar family
  • Quasar payload 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Modifies data under HKEY_USERS 64 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

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

  • Suspicious use of AdjustPrivilegeToken 28 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 10 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\Client-built.exe
    "C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2208
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:1868
    • 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:4856
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:1440
  • C:\Windows\System32\rundll32.exe
    C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
    1⤵
      PID:2108
    • C:\Windows\system32\SearchIndexer.exe
      C:\Windows\system32\SearchIndexer.exe /Embedding
      1⤵
      • Modifies data under HKEY_USERS
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:4788
      • C:\Windows\system32\SearchProtocolHost.exe
        "C:\Windows\system32\SearchProtocolHost.exe" Global\UsGthrFltPipeMssGthrPipe1_ Global\UsGthrCtrlFltPipeMssGthrPipe1 1 -2147483646 "Software\Microsoft\Windows Search" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT; MS Search 4.0 Robot)" "C:\ProgramData\Microsoft\Search\Data\Temp\usgthrsvc" "DownLevelDaemon"
        2⤵
        • Modifies data under HKEY_USERS
        PID:2376
      • C:\Windows\system32\SearchFilterHost.exe
        "C:\Windows\system32\SearchFilterHost.exe" 0 800 804 812 8192 808 784
        2⤵
        • Modifies data under HKEY_USERS
        PID:4568

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

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

      Filesize

      3.1MB

      MD5

      96dbf079644fad007ddee4a898bdb096

      SHA1

      3eec62ed768ce4a1181f00a0dd6cca3564e1f9f1

      SHA256

      3b3900adf2232fb5a995c9f6884feededfbe4a862a076ac3af936e4b5a858887

      SHA512

      356a13c7ab5bb02ee79a2ff9525f0f8ca832302fba37cf140af8264d31933a00745b59d7f742a42ef0576964f6e112580430996ac068f63c4112907c69471385

    • memory/2208-0-0x00007FFEAA393000-0x00007FFEAA395000-memory.dmp

      Filesize

      8KB

    • memory/2208-1-0x0000000000810000-0x0000000000B34000-memory.dmp

      Filesize

      3.1MB

    • memory/2208-2-0x00007FFEAA390000-0x00007FFEAAE51000-memory.dmp

      Filesize

      10.8MB

    • memory/2208-10-0x00007FFEAA390000-0x00007FFEAAE51000-memory.dmp

      Filesize

      10.8MB

    • memory/4568-73-0x000002002C0F0000-0x000002002C100000-memory.dmp

      Filesize

      64KB

    • memory/4568-66-0x000002002C0F0000-0x000002002C100000-memory.dmp

      Filesize

      64KB

    • memory/4568-78-0x000002002C0F0000-0x000002002C100000-memory.dmp

      Filesize

      64KB

    • memory/4568-79-0x000002002C0F0000-0x000002002C100000-memory.dmp

      Filesize

      64KB

    • memory/4568-80-0x000002002C0F0000-0x000002002C100000-memory.dmp

      Filesize

      64KB

    • memory/4568-81-0x000002002C0F0000-0x000002002C100000-memory.dmp

      Filesize

      64KB

    • memory/4568-82-0x000002002C0F0000-0x000002002C100000-memory.dmp

      Filesize

      64KB

    • memory/4568-83-0x000002002C0F0000-0x000002002C100000-memory.dmp

      Filesize

      64KB

    • memory/4568-84-0x000002002C0F0000-0x000002002C100000-memory.dmp

      Filesize

      64KB

    • memory/4568-77-0x000002002C0F0000-0x000002002C100000-memory.dmp

      Filesize

      64KB

    • memory/4568-55-0x000002002C0F0000-0x000002002C100000-memory.dmp

      Filesize

      64KB

    • memory/4568-56-0x000002002C0F0000-0x000002002C100000-memory.dmp

      Filesize

      64KB

    • memory/4568-57-0x000002002C0F0000-0x000002002C100000-memory.dmp

      Filesize

      64KB

    • memory/4568-60-0x000002002C0F0000-0x000002002C100000-memory.dmp

      Filesize

      64KB

    • memory/4568-59-0x000002002C0F0000-0x000002002C100000-memory.dmp

      Filesize

      64KB

    • memory/4568-58-0x000002002C0F0000-0x000002002C100000-memory.dmp

      Filesize

      64KB

    • memory/4568-62-0x000002002C0F0000-0x000002002C100000-memory.dmp

      Filesize

      64KB

    • memory/4568-63-0x000002002C0F0000-0x000002002C100000-memory.dmp

      Filesize

      64KB

    • memory/4568-65-0x000002002C0F0000-0x000002002C100000-memory.dmp

      Filesize

      64KB

    • memory/4568-74-0x000002002C0F0000-0x000002002C100000-memory.dmp

      Filesize

      64KB

    • memory/4568-64-0x000002002C0F0000-0x000002002C100000-memory.dmp

      Filesize

      64KB

    • memory/4568-69-0x000002002C0F0000-0x000002002C100000-memory.dmp

      Filesize

      64KB

    • memory/4568-70-0x000002002C0F0000-0x000002002C100000-memory.dmp

      Filesize

      64KB

    • memory/4568-68-0x000002002C0F0000-0x000002002C100000-memory.dmp

      Filesize

      64KB

    • memory/4568-67-0x000002002C0F0000-0x000002002C100000-memory.dmp

      Filesize

      64KB

    • memory/4568-61-0x000002002C0F0000-0x000002002C100000-memory.dmp

      Filesize

      64KB

    • memory/4568-71-0x000002002C0F0000-0x000002002C100000-memory.dmp

      Filesize

      64KB

    • memory/4568-72-0x000002002C0F0000-0x000002002C100000-memory.dmp

      Filesize

      64KB

    • memory/4568-75-0x000002002C0F0000-0x000002002C100000-memory.dmp

      Filesize

      64KB

    • memory/4568-76-0x000002002C0F0000-0x000002002C100000-memory.dmp

      Filesize

      64KB

    • memory/4788-53-0x000001FE912D0000-0x000001FE912D8000-memory.dmp

      Filesize

      32KB

    • memory/4788-49-0x000001FE8E640000-0x000001FE8E648000-memory.dmp

      Filesize

      32KB

    • memory/4788-34-0x000001FE8A160000-0x000001FE8A170000-memory.dmp

      Filesize

      64KB

    • memory/4788-17-0x000001FE8A050000-0x000001FE8A060000-memory.dmp

      Filesize

      64KB

    • memory/4856-9-0x00007FFEAA390000-0x00007FFEAAE51000-memory.dmp

      Filesize

      10.8MB

    • memory/4856-11-0x00007FFEAA390000-0x00007FFEAAE51000-memory.dmp

      Filesize

      10.8MB

    • memory/4856-15-0x000000001C900000-0x000000001CE28000-memory.dmp

      Filesize

      5.2MB

    • memory/4856-14-0x00007FFEAA390000-0x00007FFEAAE51000-memory.dmp

      Filesize

      10.8MB

    • memory/4856-13-0x000000001BFD0000-0x000000001C082000-memory.dmp

      Filesize

      712KB

    • memory/4856-12-0x000000001B960000-0x000000001B9B0000-memory.dmp

      Filesize

      320KB