Analysis

  • max time kernel
    19s
  • max time network
    20s
  • 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 09:58

General

  • Target

    Client-built.exe

  • Size

    3.2MB

  • MD5

    76be66d7518dce8b34eb7d9b2fc39f49

  • SHA1

    5e11492ccd1ff35570ca819a1a833b763f984f1b

  • SHA256

    251378348a702c2e19c5d0757f921497cdfe69c1cc908e52a61e0d54c655a5be

  • SHA512

    1a67d53663aca80b90cd19bb47559bd9bc1fd0d3fe6336006d1f3355982023467955894283ae72fe0566ee1f71fe61b3732c2897e41ed4cd64f3b23eedd388c4

  • SSDEEP

    49152:QvRuf2NUaNmwzPWlvdaKM7ZxTwPuoLaoNdSTHHB72eh2NT:Qvsf2NUaNmwzPWlvdaB7ZxTw2o2

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

98.218.3.74:4800

2601:147:8500:53c0:959e:b4e0:7099:8e90:4800

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
  • 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 8 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:2916
    • 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:2384
    • 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:2284
      • 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:688
  • 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:1076
    • 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,0x7fff590b3cb8,0x7fff590b3cc8,0x7fff590b3cd8
      2⤵
        PID:3352
      • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
        "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=gpu-process --field-trial-handle=1844,16187136709046951212,3687144693836546428,131072 --gpu-preferences=SAAAAAAAAADgAAAwAAAAAAAAAAAAAAAAAABgAAAAAAAoAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAB4AAAAAAAAAHgAAAAAAAAAKAAAAAQAAAAgAAAAAAAAACgAAAAAAAAAMAAAAAAAAAA4AAAAAAAAABAAAAAAAAAAAAAAAAUAAAAQAAAAAAAAAAAAAAAGAAAAEAAAAAAAAAABAAAABQAAABAAAAAAAAAAAQAAAAYAAAAIAAAAAAAAAAgAAAAAAAAA --mojo-platform-channel-handle=1900 /prefetch:2
        2⤵
          PID:4532
        • 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=1844,16187136709046951212,3687144693836546428,131072 --lang=en-US --service-sandbox-type=none --mojo-platform-channel-handle=2312 /prefetch:3
          2⤵
          • Suspicious behavior: EnumeratesProcesses
          PID:1508
        • 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=1844,16187136709046951212,3687144693836546428,131072 --lang=en-US --service-sandbox-type=utility --mojo-platform-channel-handle=2780 /prefetch:8
          2⤵
            PID:4360
          • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
            "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=renderer --field-trial-handle=1844,16187136709046951212,3687144693836546428,131072 --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=3252 /prefetch:1
            2⤵
              PID:1448
            • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
              "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=renderer --field-trial-handle=1844,16187136709046951212,3687144693836546428,131072 --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=3288 /prefetch:1
              2⤵
                PID:2560
              • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
                "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=renderer --field-trial-handle=1844,16187136709046951212,3687144693836546428,131072 --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=4668 /prefetch:1
                2⤵
                  PID:2192
                • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
                  "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=renderer --field-trial-handle=1844,16187136709046951212,3687144693836546428,131072 --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=4696 /prefetch:1
                  2⤵
                    PID:3860
                  • C:\Program Files (x86)\Microsoft\Edge\Application\90.0.818.66\identity_helper.exe
                    "C:\Program Files (x86)\Microsoft\Edge\Application\90.0.818.66\identity_helper.exe" --type=utility --utility-sub-type=winrt_app_id.mojom.WinrtAppIdService --field-trial-handle=1844,16187136709046951212,3687144693836546428,131072 --lang=en-US --service-sandbox-type=none --mojo-platform-channel-handle=5232 /prefetch:8
                    2⤵
                    • Suspicious behavior: EnumeratesProcesses
                    PID:4640
                  • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
                    "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=edge_collections.mojom.CollectionsDataManager --field-trial-handle=1844,16187136709046951212,3687144693836546428,131072 --lang=en-US --service-sandbox-type=collections --mojo-platform-channel-handle=4972 /prefetch:8
                    2⤵
                      PID:4504
                    • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
                      "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=chrome.mojom.UtilWin --field-trial-handle=1844,16187136709046951212,3687144693836546428,131072 --lang=en-US --service-sandbox-type=none --mojo-platform-channel-handle=5396 /prefetch:8
                      2⤵
                      • Suspicious behavior: EnumeratesProcesses
                      PID:2328
                  • C:\Windows\System32\CompPkgSrv.exe
                    C:\Windows\System32\CompPkgSrv.exe -Embedding
                    1⤵
                      PID:2084
                    • C:\Windows\System32\CompPkgSrv.exe
                      C:\Windows\System32\CompPkgSrv.exe -Embedding
                      1⤵
                        PID:2052

                      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

                        d91478312beae099b8ed57e547611ba2

                        SHA1

                        4b927559aedbde267a6193e3e480fb18e75c43d7

                        SHA256

                        df43cd7779d9fc91fd0416155d6771bc81565e98be38689cb17caece256bf043

                        SHA512

                        4086c4ebe410a37d0124fc8bd00c58775e70ab2b7b5a39b4e49b332ce5b4866c6775707436395467aff9596507c96fb4896f3bf0249c5b9c99a927f31dcc1a96

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

                        Filesize

                        152B

                        MD5

                        d7145ec3fa29a4f2df900d1418974538

                        SHA1

                        1368d579635ba1a53d7af0ed89bf0b001f149f9d

                        SHA256

                        efc56eb46cf3352bf706c0309d5d740bca6ac06142f9bdc5e8344b81d4d83d59

                        SHA512

                        5bb663ede88f8b7c96b09c1214aac68eda99bc09525ac383baa96914ff7d553ea1aed09e3c9d16893d791c81ddb164c682dfbb4759ac0bc751221f3e36558a91

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

                        Filesize

                        180B

                        MD5

                        00a455d9d155394bfb4b52258c97c5e5

                        SHA1

                        2761d0c955353e1982a588a3df78f2744cfaa9df

                        SHA256

                        45a13c77403533b12fbeeeb580e1c32400ca17a32e15caa8c8e6a180ece27fed

                        SHA512

                        9553f8553332afbb1b4d5229bbf58aed7a51571ab45cbf01852b36c437811befcbc86f80ec422f222963fa7dabb04b0c9ae72e9d4ff2eeb1e58cde894fbe234f

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

                        Filesize

                        5KB

                        MD5

                        f162b3130bcd69a09cf13271b3c3ea07

                        SHA1

                        63327f056cfbdb76c1270aeadcf7bd8083bc744f

                        SHA256

                        5422e01a42c17c6dbad34ac0889d296ddb456818ef072452021fcab81f8f2a18

                        SHA512

                        aa8fb5058d9c4a45b1e5d73a26241f59576bf4e5767bb82e0a7ae25dfd7f2f570c6ca8d23ede13cdae7fd32e0e3c147ad8918fe7c7df949552d069911e7530d5

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

                        Filesize

                        5KB

                        MD5

                        23ba98bddf55ba5f149caa1e23379798

                        SHA1

                        4b0f65801e6163d2a99e1075562ee396fc554412

                        SHA256

                        0a37ab3bb6281f0168dad6762f88db40f0eb702abeb74b66917b433cfeb482e5

                        SHA512

                        2a0c80f8dcde8b469873d81031ca0fce81331be3260cf9c34653f2ddc1c89b184c7e5f78b95b38188e92d6c7118bce573e61ebe2c9cc837b1bf1c27ebeff4eee

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

                        Filesize

                        6KB

                        MD5

                        412b59ecdf127d3eb8e0dd8a87accdd9

                        SHA1

                        64a385985e0f18efcda90c2219347a4016f98475

                        SHA256

                        c73c30273fedbc5eed06ba8760a38d1449000e29bbdb371633ba743e67c9d3f7

                        SHA512

                        848b4cd3e0f3ea4198bc18ef513ef31ae114b2b83d809b549edc516af5fcce0bf11f796693e631af65707826e655c166145e3a897af509695d7e337290ea9b0b

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

                        Filesize

                        16B

                        MD5

                        46295cac801e5d4857d09837238a6394

                        SHA1

                        44e0fa1b517dbf802b18faf0785eeea6ac51594b

                        SHA256

                        0f1bad70c7bd1e0a69562853ec529355462fcd0423263a3d39d6d0d70b780443

                        SHA512

                        8969402593f927350e2ceb4b5bc2a277f3754697c1961e3d6237da322257fbab42909e1a742e22223447f3a4805f8d8ef525432a7c3515a549e984d3eff72b23

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

                        Filesize

                        16B

                        MD5

                        206702161f94c5cd39fadd03f4014d98

                        SHA1

                        bd8bfc144fb5326d21bd1531523d9fb50e1b600a

                        SHA256

                        1005a525006f148c86efcbfb36c6eac091b311532448010f70f7de9a68007167

                        SHA512

                        0af09f26941b11991c750d1a2b525c39a8970900e98cba96fd1b55dbf93fee79e18b8aab258f48b4f7bda40d059629bc7770d84371235cdb1352a4f17f80e145

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

                        Filesize

                        10KB

                        MD5

                        11d55029f0f0045d03b9f348f3d8d0b0

                        SHA1

                        ca998bc38cede1769870ec2329d2ce1b4cbce7fa

                        SHA256

                        23fed481949474924d644168ef931c0dbbab14ea92c502c22c3ddc26aeabd0c0

                        SHA512

                        e50698a59a95852a47a194850be424e8fe8d2d47cde31c9cf55c915e508a66056222a13710060b825af62ffd5bce87e48a63bf1e2506716318e0bf3e6cfd59c1

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

                        Filesize

                        10KB

                        MD5

                        143bddd416cf7b6c56ae0d68f7589e0b

                        SHA1

                        8e0482e8fe8c69adf0af012fc8061ca5da0e1d79

                        SHA256

                        91d1e4f3a37017db780052fd57e2f8fb041bd2e341cbbde4c36a124c74f8c1a4

                        SHA512

                        f531d60a7837db3f679b24c24da8b73a2de6f483245a2b7e0c7fc6db257c863ad9151da5a051c6eb898845653e5c67f1c739a696ce2a78f31c5fd2485cf12349

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

                        Filesize

                        3.2MB

                        MD5

                        76be66d7518dce8b34eb7d9b2fc39f49

                        SHA1

                        5e11492ccd1ff35570ca819a1a833b763f984f1b

                        SHA256

                        251378348a702c2e19c5d0757f921497cdfe69c1cc908e52a61e0d54c655a5be

                        SHA512

                        1a67d53663aca80b90cd19bb47559bd9bc1fd0d3fe6336006d1f3355982023467955894283ae72fe0566ee1f71fe61b3732c2897e41ed4cd64f3b23eedd388c4

                      • memory/2284-60-0x00007FFF4BCD0000-0x00007FFF4C792000-memory.dmp

                        Filesize

                        10.8MB

                      • memory/2284-13-0x000000001C9F0000-0x000000001CAA2000-memory.dmp

                        Filesize

                        712KB

                      • memory/2284-12-0x000000001C8E0000-0x000000001C930000-memory.dmp

                        Filesize

                        320KB

                      • memory/2284-11-0x00007FFF4BCD0000-0x00007FFF4C792000-memory.dmp

                        Filesize

                        10.8MB

                      • memory/2284-9-0x00007FFF4BCD0000-0x00007FFF4C792000-memory.dmp

                        Filesize

                        10.8MB

                      • memory/2916-0-0x00007FFF4BCD3000-0x00007FFF4BCD5000-memory.dmp

                        Filesize

                        8KB

                      • memory/2916-10-0x00007FFF4BCD0000-0x00007FFF4C792000-memory.dmp

                        Filesize

                        10.8MB

                      • memory/2916-2-0x00007FFF4BCD0000-0x00007FFF4C792000-memory.dmp

                        Filesize

                        10.8MB

                      • memory/2916-1-0x0000000000700000-0x0000000000A34000-memory.dmp

                        Filesize

                        3.2MB