Analysis

  • max time kernel
    147s
  • max time network
    156s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    27/03/2024, 23:51

General

  • Target
    Client-built.exe
  • Size 540KB
  • Sample240327-3v8ykade83
  • SHA256 c4b75cdc84b5570235c4568fd085b2f82e3fa7ce16e39d56fddc821416129efb
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • quasar

Version
  • 3.1.5.0

Botnet
  • MicrosoftEdge

C2
  • common-congratulations.gl.at.ply.gg:65362

  • 127.0.0.1:65362

Mutex
  • QSR_MUTEX_MKoa3FQkTUYpcQOoO7

Attributes
  • encryption_key

    4ScLZeaXkOHrLSyZOCm8

  • install_name

    MicrosoftEdge.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    MicrosoftEdge

  • subdirectory

    MicrosoftEdge

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 3 IoCs
  • Suspicious use of NtCreateUserProcessOtherParentProcess 2 IoCs
  • Downloads MZ/PE file
  • Executes dropped EXE 1 IoCs
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs 3 IoCs
  • Looks up external IP address via web service 1 IoCs

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

  • Suspicious use of SetThreadContext 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Program crash 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 4 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 11 IoCs
  • Suspicious use of FindShellTrayWindow 40 IoCs
  • Suspicious use of SendNotifyMessage 39 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 46 IoCs

Processes

  • C:\Windows\system32\winlogon.exe
    winlogon.exe
    1⤵
      PID:632
      • C:\Windows\SysWOW64\dllhost.exe
        C:\Windows\SysWOW64\dllhost.exe /Processid:{af7721ae-47aa-4447-aa9d-7c57f37cba84}
        2⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:3652
      • C:\Windows\SysWOW64\dllhost.exe
        C:\Windows\SysWOW64\dllhost.exe /Processid:{a36f4311-c7a4-4bf3-91b6-384cf5605826}
        2⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:3904
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3904 -s 188
          3⤵
          • Program crash
          PID:2892
    • C:\Users\Admin\AppData\Local\Temp\Client-built.exe
      "C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
      1⤵
      • Suspicious use of NtCreateUserProcessOtherParentProcess
      • Suspicious use of SetThreadContext
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:5056
      • C:\Windows\SysWOW64\SCHTASKS.exe
        "SCHTASKS.exe" /create /tn "$77Client-built.exe" /tr "'C:\Users\Admin\AppData\Local\Temp\Client-built.exe'" /sc onlogon /rl HIGHEST
        2⤵
        • Creates scheduled task(s)
        PID:4848
      • C:\Windows\SysWOW64\schtasks.exe
        "schtasks" /create /tn "MicrosoftEdge" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\Client-built.exe" /rl HIGHEST /f
        2⤵
        • Creates scheduled task(s)
        PID:4152
      • C:\Users\Admin\AppData\Roaming\MicrosoftEdge\MicrosoftEdge.exe
        "C:\Users\Admin\AppData\Roaming\MicrosoftEdge\MicrosoftEdge.exe"
        2⤵
        • Suspicious use of NtCreateUserProcessOtherParentProcess
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of SetWindowsHookEx
        • Suspicious use of WriteProcessMemory
        PID:2696
        • C:\Windows\SysWOW64\SCHTASKS.exe
          "SCHTASKS.exe" /create /tn "$77MicrosoftEdge.exe" /tr "'C:\Users\Admin\AppData\Roaming\MicrosoftEdge\MicrosoftEdge.exe'" /sc onlogon /rl HIGHEST
          3⤵
          • Creates scheduled task(s)
          PID:4184
        • C:\Windows\SysWOW64\schtasks.exe
          "schtasks" /create /tn "MicrosoftEdge" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\MicrosoftEdge\MicrosoftEdge.exe" /rl HIGHEST /f
          3⤵
          • Creates scheduled task(s)
          PID:4344
        • C:\Windows\SysWOW64\schtasks.exe
          "schtasks" /delete /tn "MicrosoftEdge" /f
          3⤵
            PID:3676
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 2696 -s 2672
            3⤵
            • Program crash
            PID:2420
      • C:\Windows\system32\taskmgr.exe
        "C:\Windows\system32\taskmgr.exe" /4
        1⤵
        • Checks SCSI registry key(s)
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of FindShellTrayWindow
        • Suspicious use of SendNotifyMessage
        PID:1540
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 3904 -ip 3904
        1⤵
          PID:4460
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 528 -p 2696 -ip 2696
          1⤵
            PID:400

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

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                Downloads

                MicrosoftEdge.exe

                • Path C:\Users\Admin\AppData\Roaming\MicrosoftEdge\MicrosoftEdge.exe
                • Size 540KB
                • SHA256 c4b75cdc84b5570235c4568fd085b2f82e3fa7ce16e39d56fddc821416129efb
                • MD5 SHA1 SHA512 SSDEEP

                memory/1540-32-0x000001AEE2A80000-0x000001AEE2A81000-memory.dmp

                memory/1540-35-0x000001AEE2A80000-0x000001AEE2A81000-memory.dmp

                memory/1540-34-0x000001AEE2A80000-0x000001AEE2A81000-memory.dmp

                memory/1540-36-0x000001AEE2A80000-0x000001AEE2A81000-memory.dmp

                memory/1540-37-0x000001AEE2A80000-0x000001AEE2A81000-memory.dmp

                memory/1540-38-0x000001AEE2A80000-0x000001AEE2A81000-memory.dmp

                memory/1540-8-0x000001AEE2A80000-0x000001AEE2A81000-memory.dmp

                memory/1540-9-0x000001AEE2A80000-0x000001AEE2A81000-memory.dmp

                memory/1540-10-0x000001AEE2A80000-0x000001AEE2A81000-memory.dmp

                memory/1540-39-0x000001AEE2A80000-0x000001AEE2A81000-memory.dmp

                memory/2696-63-0x000000006FCA0000-0x000000006FCB0000-memory.dmp

                memory/2696-106-0x0000000001040000-0x0000000001061000-memory.dmp

                memory/2696-68-0x0000000001040000-0x0000000001061000-memory.dmp

                memory/2696-64-0x0000000077CB2000-0x0000000077CB3000-memory.dmp

                memory/2696-61-0x0000000001040000-0x0000000001061000-memory.dmp

                memory/2696-102-0x00000000077D0000-0x00000000077DA000-memory.dmp

                memory/2696-108-0x0000000005660000-0x0000000005670000-memory.dmp

                memory/2696-87-0x0000000005660000-0x0000000005670000-memory.dmp

                memory/2696-107-0x0000000075240000-0x00000000759F0000-memory.dmp

                memory/2696-75-0x0000000000990000-0x0000000000A1E000-memory.dmp

                memory/2696-74-0x0000000075240000-0x00000000759F0000-memory.dmp

                memory/2696-72-0x0000000000E00000-0x0000000000E21000-memory.dmp

                memory/2696-66-0x0000000077CB3000-0x0000000077CB4000-memory.dmp

                memory/2696-111-0x0000000075240000-0x00000000759F0000-memory.dmp

                memory/3652-11-0x0000000000400000-0x0000000000433000-memory.dmp

                memory/3652-12-0x0000000000400000-0x0000000000433000-memory.dmp

                memory/3652-16-0x0000000000400000-0x0000000000433000-memory.dmp

                memory/3652-14-0x0000000000400000-0x0000000000433000-memory.dmp

                memory/3652-13-0x0000000000400000-0x0000000000433000-memory.dmp

                memory/3652-22-0x0000000003350000-0x0000000003371000-memory.dmp

                memory/3904-93-0x0000000000400000-0x0000000000433000-memory.dmp

                memory/3904-94-0x0000000000400000-0x0000000000433000-memory.dmp

                memory/3904-98-0x0000000000400000-0x0000000000433000-memory.dmp

                memory/3904-96-0x0000000000400000-0x0000000000433000-memory.dmp

                memory/4152-51-0x0000000077CB2000-0x0000000077CB3000-memory.dmp

                memory/4152-49-0x00000000012E0000-0x0000000001301000-memory.dmp

                memory/4152-45-0x0000000001090000-0x00000000010B1000-memory.dmp

                memory/4152-54-0x0000000001090000-0x00000000010B1000-memory.dmp

                memory/4152-53-0x0000000077CB3000-0x0000000077CB4000-memory.dmp

                memory/4152-56-0x0000000000C70000-0x0000000000CA2000-memory.dmp

                memory/4152-48-0x000000006FCA0000-0x000000006FCB0000-memory.dmp

                memory/4184-79-0x0000000000B50000-0x0000000000B71000-memory.dmp

                memory/4184-89-0x0000000000C70000-0x0000000000CA2000-memory.dmp

                memory/4184-88-0x0000000000B50000-0x0000000000B71000-memory.dmp

                memory/4184-81-0x0000000000B20000-0x0000000000B41000-memory.dmp

                memory/4184-85-0x0000000077CB3000-0x0000000077CB4000-memory.dmp

                memory/4184-83-0x000000006FCA0000-0x000000006FCB0000-memory.dmp

                memory/4184-84-0x0000000077CB2000-0x0000000077CB3000-memory.dmp

                memory/5056-47-0x0000000075240000-0x00000000759F0000-memory.dmp

                memory/5056-60-0x0000000002CD0000-0x0000000002CE0000-memory.dmp

                memory/5056-26-0x000000006FCA0000-0x000000006FCB0000-memory.dmp

                memory/5056-25-0x0000000077CB3000-0x0000000077CB4000-memory.dmp

                memory/5056-76-0x0000000075240000-0x00000000759F0000-memory.dmp

                memory/5056-29-0x0000000077CB2000-0x0000000077CB3000-memory.dmp

                memory/5056-71-0x0000000077C41000-0x0000000077D61000-memory.dmp

                memory/5056-33-0x0000000007060000-0x00000000070C6000-memory.dmp

                memory/5056-40-0x00000000070D0000-0x00000000070E2000-memory.dmp

                memory/5056-24-0x0000000077CB2000-0x0000000077CB3000-memory.dmp

                memory/5056-41-0x00000000075E0000-0x000000000761C000-memory.dmp

                memory/5056-73-0x00000000066A0000-0x00000000066C1000-memory.dmp

                memory/5056-1-0x0000000000850000-0x00000000008DE000-memory.dmp

                memory/5056-23-0x00000000066A0000-0x00000000066C1000-memory.dmp

                memory/5056-21-0x00000000066A0000-0x00000000066C1000-memory.dmp

                memory/5056-18-0x00000000062A0000-0x00000000062BB000-memory.dmp

                memory/5056-7-0x0000000077C41000-0x0000000077D61000-memory.dmp

                memory/5056-5-0x0000000006BA0000-0x0000000006BDE000-memory.dmp

                memory/5056-4-0x0000000006300000-0x0000000006392000-memory.dmp

                memory/5056-3-0x0000000002CD0000-0x0000000002CE0000-memory.dmp

                memory/5056-2-0x0000000005720000-0x0000000005CC4000-memory.dmp

                memory/5056-0-0x0000000075240000-0x00000000759F0000-memory.dmp