Analysis

  • max time kernel
    149s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03-11-2024 14:38

General

  • Target

    5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe

  • Size

    774KB

  • MD5

    e30f4b28319c4d5d490a36c80698c7c5

  • SHA1

    89199dbf12c0ca07992cedcd50ab366c04568fc5

  • SHA256

    5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74

  • SHA512

    3f2440155e22eb8c6ef359fe17755ffa270da6a6cec99ff31d23766390212895dc27e9aa55ee0b6b5720a96088dbd7be372a3ebf34fff4b756410c70fd52d353

  • SSDEEP

    12288:rKnhyuMP6/bbH+NzvZ9KSDdBrxqzdxD0XGfnyr7Ha2/Mg45omnFjkCC1htlJI8XO:8YP6XeRKShcDD0X6nqHa2A5DF8tnI8+

Malware Config

Extracted

Family

quasar

Version

1.3.0.0

Botnet

VTROY

C2

31.13.224.12:61512

31.13.224.13:61513

Mutex

QSR_MUTEX_4Q2rJqiVyC7hohzbjx

Attributes
  • encryption_key

    7Vp2dMCHrMjJthQ2Elyy

  • install_name

    downloads.exe

  • log_directory

    Logs

  • reconnect_delay

    5000

  • startup_key

    cssrse.exe

  • subdirectory

    downloadupdates

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar family
  • Quasar payload 1 IoCs
  • Executes dropped EXE 5 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 6 IoCs
  • Program crash 1 IoCs
  • System Location Discovery: System Language Discovery 1 TTPs 11 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Scheduled Task/Job: Scheduled Task 1 TTPs 3 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 5 IoCs
  • Suspicious use of UnmapMainImage 1 IoCs
  • Suspicious use of WriteProcessMemory 63 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe
    "C:\Users\Admin\AppData\Local\Temp\5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2804
    • C:\Users\Admin\AppData\Local\Temp\5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe
      C:\Users\Admin\AppData\Local\Temp\5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:4704
      • C:\Windows\SysWOW64\schtasks.exe
        "schtasks" /create /tn "cssrse.exe" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe" /rl HIGHEST /f
        3⤵
        • System Location Discovery: System Language Discovery
        • Scheduled Task/Job: Scheduled Task
        PID:3972
      • C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
        "C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe"
        3⤵
        • Executes dropped EXE
        • System Location Discovery: System Language Discovery
        PID:5000
    • C:\Users\Admin\AppData\Local\Temp\5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe
      C:\Users\Admin\AppData\Local\Temp\5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe
      2⤵
      • Suspicious use of UnmapMainImage
      PID:4936
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 4936 -s 12
        3⤵
        • Program crash
        PID:4148
    • C:\Users\Admin\AppData\Local\Temp\5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe
      C:\Users\Admin\AppData\Local\Temp\5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:4408
      • C:\Windows\SysWOW64\schtasks.exe
        "schtasks" /create /tn "cssrse.exe" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe" /rl HIGHEST /f
        3⤵
        • System Location Discovery: System Language Discovery
        • Scheduled Task/Job: Scheduled Task
        PID:4840
      • C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
        "C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • System Location Discovery: System Language Discovery
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1608
        • C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
          C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
          4⤵
          • Executes dropped EXE
          • System Location Discovery: System Language Discovery
          PID:1388
        • C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
          C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
          4⤵
          • Executes dropped EXE
          • System Location Discovery: System Language Discovery
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:4548
          • C:\Windows\SysWOW64\schtasks.exe
            "schtasks" /create /tn "cssrse.exe" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe" /rl HIGHEST /f
            5⤵
            • System Location Discovery: System Language Discovery
            • Scheduled Task/Job: Scheduled Task
            PID:3488
        • C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
          C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
          4⤵
          • Executes dropped EXE
          • System Location Discovery: System Language Discovery
          PID:4156
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 4936 -ip 4936
    1⤵
      PID:4772

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe.log

      Filesize

      522B

      MD5

      0f39d6b9afc039d81ff31f65cbf76826

      SHA1

      8356d04fe7bba2695d59b6caf5c59f58f3e1a6d8

      SHA256

      ea16b63ffd431ebf658b903710b6b3a9b8a2eb6814eee3a53b707a342780315d

      SHA512

      5bad54adb2e32717ef6275f49e2f101dd7e2011c9be14a32e5c29051e8a3f608cbd0b44ac4855ab21e790cb7a5d84c5f69de087074fd01b35259d34d07f5aaf9

    • C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe

      Filesize

      774KB

      MD5

      e30f4b28319c4d5d490a36c80698c7c5

      SHA1

      89199dbf12c0ca07992cedcd50ab366c04568fc5

      SHA256

      5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74

      SHA512

      3f2440155e22eb8c6ef359fe17755ffa270da6a6cec99ff31d23766390212895dc27e9aa55ee0b6b5720a96088dbd7be372a3ebf34fff4b756410c70fd52d353

    • memory/2804-11-0x0000000075270000-0x0000000075A20000-memory.dmp

      Filesize

      7.7MB

    • memory/2804-3-0x0000000075270000-0x0000000075A20000-memory.dmp

      Filesize

      7.7MB

    • memory/2804-4-0x0000000005450000-0x00000000054EC000-memory.dmp

      Filesize

      624KB

    • memory/2804-0-0x000000007527E000-0x000000007527F000-memory.dmp

      Filesize

      4KB

    • memory/2804-2-0x0000000007730000-0x000000000781E000-memory.dmp

      Filesize

      952KB

    • memory/2804-1-0x0000000000810000-0x00000000008DA000-memory.dmp

      Filesize

      808KB

    • memory/4408-12-0x0000000075270000-0x0000000075A20000-memory.dmp

      Filesize

      7.7MB

    • memory/4408-13-0x0000000005D10000-0x00000000062B4000-memory.dmp

      Filesize

      5.6MB

    • memory/4408-14-0x0000000005890000-0x0000000005922000-memory.dmp

      Filesize

      584KB

    • memory/4408-15-0x0000000075270000-0x0000000075A20000-memory.dmp

      Filesize

      7.7MB

    • memory/4408-29-0x0000000075270000-0x0000000075A20000-memory.dmp

      Filesize

      7.7MB

    • memory/4548-38-0x00000000066F0000-0x00000000066FA000-memory.dmp

      Filesize

      40KB

    • memory/4704-5-0x0000000000400000-0x000000000045E000-memory.dmp

      Filesize

      376KB

    • memory/4704-18-0x0000000006660000-0x0000000006672000-memory.dmp

      Filesize

      72KB

    • memory/4704-19-0x0000000006CE0000-0x0000000006D1C000-memory.dmp

      Filesize

      240KB

    • memory/4704-17-0x0000000005920000-0x0000000005986000-memory.dmp

      Filesize

      408KB

    • memory/4704-24-0x0000000075270000-0x0000000075A20000-memory.dmp

      Filesize

      7.7MB

    • memory/4704-16-0x0000000075270000-0x0000000075A20000-memory.dmp

      Filesize

      7.7MB

    • memory/4704-10-0x0000000075270000-0x0000000075A20000-memory.dmp

      Filesize

      7.7MB