Analysis

  • max time kernel
    39s
  • max time network
    41s
  • platform
    windows11-21h2_x64
  • resource
    win11-20241007-en
  • resource tags

    arch:x64arch:x86image:win11-20241007-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    04-02-2025 22:46

General

  • Target

    Client-built.exe

  • Size

    3.2MB

  • MD5

    0da7fe61b0019dc10698dfa187fec202

  • SHA1

    600f670bcefc050e9a2d52d22f719a02789d53b9

  • SHA256

    508c07e6984238119e1a58ce0a07b48d90261b02e1bd39dd1666c13830a476db

  • SHA512

    5c89f26c367568dbb79a940328e42f62942652cbca6b6bd3297676ea7560cddd8a6c6795ffc57af54a78d9c6514edfd4bc654bb76c7985b0759ec50538bc560c

  • SSDEEP

    49152:Evkt62XlaSFNWPjljiFa2RoUYI00CxP7JoGdkUTHHB72eh2NT:Ev462XlaSFNWPjljiFXRoUYI7CxPlU

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

98.218.3.74:4800

Mutex

dd229ccb-39cd-4301-9413-ea14fa25ce22

Attributes
  • encryption_key

    F023A1C93603AFE96871B3F0323AA7B852FA745F

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    discord

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar family
  • Quasar payload 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Browser Information Discovery 1 TTPs

    Enumerate browser information.

  • Enumerates system info in registry 2 TTPs 3 IoCs
  • Modifies registry class 4 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 behavior: EnumeratesProcesses 4 IoCs
  • Suspicious behavior: NtCreateUserProcessBlockNonMicrosoftBinary 4 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of FindShellTrayWindow 26 IoCs
  • Suspicious use of SendNotifyMessage 12 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 64 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:1388
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "discord" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:2836
    • 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:2940
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "discord" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:3080
  • C:\Windows\system32\svchost.exe
    C:\Windows\system32\svchost.exe -k LocalService -p -s NPSMSvc
    1⤵
      PID:3340
    • C:\Windows\system32\BackgroundTransferHost.exe
      "BackgroundTransferHost.exe" -ServerName:BackgroundTransferHost.13
      1⤵
      • Modifies registry class
      PID:2848
    • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
      "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --profile-directory=Default
      1⤵
      • Enumerates system info in registry
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious behavior: NtCreateUserProcessBlockNonMicrosoftBinary
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      • Suspicious use of WriteProcessMemory
      PID:2308
      • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
        "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=crashpad-handler "--user-data-dir=C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data" /prefetch:7 --monitor-self-annotation=ptype=crashpad-handler "--database=C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Crashpad" "--metrics-dir=C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data" --annotation=IsOfficialBuild=1 --annotation=channel= --annotation=chromium-version=90.0.4430.212 "--annotation=exe=C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --annotation=plat=Win64 "--annotation=prod=Microsoft Edge" --annotation=ver=90.0.818.66 --initial-client-data=0x100,0x104,0x108,0xdc,0x10c,0x7ffb78a93cb8,0x7ffb78a93cc8,0x7ffb78a93cd8
        2⤵
          PID:1212
        • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
          "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=gpu-process --field-trial-handle=1948,16741919207532501373,16729536412502765274,131072 --gpu-preferences=SAAAAAAAAADgAAAwAAAAAAAAAAAAAAAAAABgAAAAAAAoAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAB4AAAAAAAAAHgAAAAAAAAAKAAAAAQAAAAgAAAAAAAAACgAAAAAAAAAMAAAAAAAAAA4AAAAAAAAABAAAAAAAAAAAAAAAAUAAAAQAAAAAAAAAAAAAAAGAAAAEAAAAAAAAAABAAAABQAAABAAAAAAAAAAAQAAAAYAAAAIAAAAAAAAAAgAAAAAAAAA --mojo-platform-channel-handle=1972 /prefetch:2
          2⤵
            PID:1108
          • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
            "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=network.mojom.NetworkService --field-trial-handle=1948,16741919207532501373,16729536412502765274,131072 --lang=en-US --service-sandbox-type=none --mojo-platform-channel-handle=2024 /prefetch:3
            2⤵
            • Suspicious behavior: EnumeratesProcesses
            PID:4220
          • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
            "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=storage.mojom.StorageService --field-trial-handle=1948,16741919207532501373,16729536412502765274,131072 --lang=en-US --service-sandbox-type=utility --mojo-platform-channel-handle=2728 /prefetch:8
            2⤵
              PID:1044
            • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
              "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=renderer --field-trial-handle=1948,16741919207532501373,16729536412502765274,131072 --lang=en-US --disable-client-side-phishing-detection --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=6 --no-v8-untrusted-code-mitigations --mojo-platform-channel-handle=3316 /prefetch:1
              2⤵
                PID:3508
              • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
                "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=renderer --field-trial-handle=1948,16741919207532501373,16729536412502765274,131072 --lang=en-US --disable-client-side-phishing-detection --instant-process --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=5 --no-v8-untrusted-code-mitigations --mojo-platform-channel-handle=3332 /prefetch:1
                2⤵
                  PID:2448
                • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
                  "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=renderer --field-trial-handle=1948,16741919207532501373,16729536412502765274,131072 --lang=en-US --disable-client-side-phishing-detection --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=7 --no-v8-untrusted-code-mitigations --mojo-platform-channel-handle=4100 /prefetch:1
                  2⤵
                    PID:1168
                  • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
                    "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=renderer --field-trial-handle=1948,16741919207532501373,16729536412502765274,131072 --lang=en-US --disable-client-side-phishing-detection --instant-process --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=8 --no-v8-untrusted-code-mitigations --mojo-platform-channel-handle=3148 /prefetch:1
                    2⤵
                      PID:4524
                  • C:\Windows\System32\CompPkgSrv.exe
                    C:\Windows\System32\CompPkgSrv.exe -Embedding
                    1⤵
                      PID:4856
                    • C:\Windows\System32\CompPkgSrv.exe
                      C:\Windows\System32\CompPkgSrv.exe -Embedding
                      1⤵
                        PID:3148

                      Network

                      MITRE ATT&CK Enterprise v15

                      Replay Monitor

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                      Downloads

                      • C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Crashpad\settings.dat

                        Filesize

                        152B

                        MD5

                        02a4b762e84a74f9ee8a7d8ddd34fedb

                        SHA1

                        4a870e3bd7fd56235062789d780610f95e3b8785

                        SHA256

                        366e497233268d7cdf699242e4b2c7ecc1999d0a84e12744f5af2b638e9d86da

                        SHA512

                        19028c45f2e05a0cb32865a2554513c1536bf9da63512ff4e964c94a3e171f373493c7787d2d2a6df8012648bbefab63a9de924f119c50c39c727cf81bdc659f

                      • C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Crashpad\settings.dat

                        Filesize

                        152B

                        MD5

                        826c7cac03e3ae47bfe2a7e50281605e

                        SHA1

                        100fbea3e078edec43db48c3312fbbf83f11fca0

                        SHA256

                        239b1d7cc6f76e1d1832b0587664f114f38a21539cb8548e25626ed5053ea2ab

                        SHA512

                        a82f3c817a6460fd8907a4ac6ab37c2129fb5466707edcfb565c255680d7f7212a5669fe2a42976150f16e4e549ea8310078f22ed35514ee1b7b45b46d8cc96e

                      • C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Default\Preferences

                        Filesize

                        5KB

                        MD5

                        3ae60ed954477039a00066b99c866214

                        SHA1

                        02c85909ca70c9fab7ae897b3a2612c5c89fdc6f

                        SHA256

                        b89dc110e4e131e24ce5195f45fda2913686088a9e137b92daeb24a0ad79d455

                        SHA512

                        c43ce286465385cb70c57fcfc6df3114ae6ec0d57025b7c5ae0ea769aa48072c5f2e08591da13f5a79e046abd2ee404c93db40731025fd9850e72349a09bdb5b

                      • C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Default\Preferences

                        Filesize

                        5KB

                        MD5

                        1ff7f795c7422ca06369738de9a84e79

                        SHA1

                        3d471adbc5dd318175cc26f4ba113e563020bdfe

                        SHA256

                        55d39a3087124986cd795eb6e3092b4cce7e43ecc50f8959f48589a489e3fcc8

                        SHA512

                        52b90198f762d724abcec3fcd8d0260beeb1900128119b1168ef4a7f3cde64eca4415d91fd7d4f81a4e95760b7c106c18371db4ae6133c79bc0ce180659f7c71

                      • C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Local State

                        Filesize

                        10KB

                        MD5

                        373bbbaac329874bbe08d7430854710f

                        SHA1

                        8515ed34ace8bb6a9015a323d150bb82043eda7c

                        SHA256

                        533e7c5dd5454fa860252ae9952a79cbd8b241d7502a873fa01eeed804804626

                        SHA512

                        b71a074ce91ad314b92d6db13d65ad99c4b59da93fcb966c9cc33828d8e44ca3c658315ebbd4f49c12c06eb10969ca184f96a24b29094b91096273bbb7f44593

                      • C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\ShaderCache\GPUCache\data_1

                        Filesize

                        264KB

                        MD5

                        f50f89a0a91564d0b8a211f8921aa7de

                        SHA1

                        112403a17dd69d5b9018b8cede023cb3b54eab7d

                        SHA256

                        b1e963d702392fb7224786e7d56d43973e9b9efd1b89c17814d7c558ffc0cdec

                        SHA512

                        bf8cda48cf1ec4e73f0dd1d4fa5562af1836120214edb74957430cd3e4a2783e801fa3f4ed2afb375257caeed4abe958265237d6e0aacf35a9ede7a2e8898d58

                      • C:\Users\Admin\AppData\Local\Packages\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\AC\BackgroundTransferApi\5b732358-78c6-4e37-98e9-0393fa4cb38d.down_data

                        Filesize

                        555KB

                        MD5

                        5683c0028832cae4ef93ca39c8ac5029

                        SHA1

                        248755e4e1db552e0b6f8651b04ca6d1b31a86fb

                        SHA256

                        855abd360d8a8d6974eba92b70cbd09ce519bc8773439993f9ab37cb6847309e

                        SHA512

                        aba434bd29be191c823b02ea9b639beb10647bbe7759bbffdaa790dfb1ec2c58d74c525ef11aacda209e4effe322d1d3a07b115446c8914b07a3bce4d8a0e2c3

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

                        Filesize

                        3.2MB

                        MD5

                        0da7fe61b0019dc10698dfa187fec202

                        SHA1

                        600f670bcefc050e9a2d52d22f719a02789d53b9

                        SHA256

                        508c07e6984238119e1a58ce0a07b48d90261b02e1bd39dd1666c13830a476db

                        SHA512

                        5c89f26c367568dbb79a940328e42f62942652cbca6b6bd3297676ea7560cddd8a6c6795ffc57af54a78d9c6514edfd4bc654bb76c7985b0759ec50538bc560c

                      • memory/1388-10-0x00007FFB801F0000-0x00007FFB80CB2000-memory.dmp

                        Filesize

                        10.8MB

                      • memory/1388-0-0x00007FFB801F3000-0x00007FFB801F5000-memory.dmp

                        Filesize

                        8KB

                      • memory/1388-2-0x00007FFB801F0000-0x00007FFB80CB2000-memory.dmp

                        Filesize

                        10.8MB

                      • memory/1388-1-0x0000000000CD0000-0x0000000001004000-memory.dmp

                        Filesize

                        3.2MB

                      • memory/2940-15-0x000000001D0E0000-0x000000001D608000-memory.dmp

                        Filesize

                        5.2MB

                      • memory/2940-14-0x00007FFB801F0000-0x00007FFB80CB2000-memory.dmp

                        Filesize

                        10.8MB

                      • memory/2940-13-0x000000001C9F0000-0x000000001CAA2000-memory.dmp

                        Filesize

                        712KB

                      • memory/2940-12-0x000000001C8E0000-0x000000001C930000-memory.dmp

                        Filesize

                        320KB

                      • memory/2940-11-0x00007FFB801F0000-0x00007FFB80CB2000-memory.dmp

                        Filesize

                        10.8MB

                      • memory/2940-9-0x00007FFB801F0000-0x00007FFB80CB2000-memory.dmp

                        Filesize

                        10.8MB