Analysis

  • max time kernel
    35s
  • max time network
    38s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    13-05-2024 21:01

General

  • Target

    https://github.com/Z3XVR1/Byfron-Bypasser

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.114:4782

Mutex

d5420347-9156-4e09-98af-1ad46b220831

Attributes
  • encryption_key

    D5656C6F6DCF32FFE4A0A45B9A1E278FCDFF35C0

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Quasar Client Startup

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 2 IoCs

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

  • Enumerates system info in registry 2 TTPs 3 IoCs
  • Modifies registry class 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 8 IoCs
  • Suspicious behavior: NtCreateUserProcessBlockNonMicrosoftBinary 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of FindShellTrayWindow 34 IoCs
  • Suspicious use of SendNotifyMessage 25 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:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
    "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --single-argument https://github.com/Z3XVR1/Byfron-Bypasser
    1⤵
    • Enumerates system info in registry
    • Modifies registry class
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious behavior: NtCreateUserProcessBlockNonMicrosoftBinary
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of SendNotifyMessage
    • Suspicious use of WriteProcessMemory
    PID:3352
    • 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=92.0.4515.131 "--annotation=exe=C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --annotation=plat=Win64 "--annotation=prod=Microsoft Edge" --annotation=ver=92.0.902.67 --initial-client-data=0xfc,0x100,0x104,0xd8,0x108,0x7ffcab8046f8,0x7ffcab804708,0x7ffcab804718
      2⤵
        PID:2164
      • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
        "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=gpu-process --field-trial-handle=2184,13249538675625618260,11344057943488026144,131072 --gpu-preferences=UAAAAAAAAADgAAAQAAAAAAAAAAAAAAAAAABgAAAAAAAwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAHgAAAAAAAAAeAAAAAAAAAAoAAAABAAAACAAAAAAAAAAKAAAAAAAAAAwAAAAAAAAADgAAAAAAAAAEAAAAAAAAAAAAAAADQAAABAAAAAAAAAAAQAAAA0AAAAQAAAAAAAAAAQAAAANAAAAEAAAAAAAAAAHAAAADQAAAAgAAAAAAAAACAAAAAAAAAA= --mojo-platform-channel-handle=2196 /prefetch:2
        2⤵
          PID:2676
        • 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=2184,13249538675625618260,11344057943488026144,131072 --lang=en-US --service-sandbox-type=none --mojo-platform-channel-handle=2284 /prefetch:3
          2⤵
          • Suspicious behavior: EnumeratesProcesses
          PID:3024
        • 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=2184,13249538675625618260,11344057943488026144,131072 --lang=en-US --service-sandbox-type=utility --mojo-platform-channel-handle=2668 /prefetch:8
          2⤵
            PID:3216
          • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
            "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=renderer --field-trial-handle=2184,13249538675625618260,11344057943488026144,131072 --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=3312 /prefetch:1
            2⤵
              PID:680
            • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
              "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=renderer --field-trial-handle=2184,13249538675625618260,11344057943488026144,131072 --lang=en-US --disable-client-side-phishing-detection --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=5 --no-v8-untrusted-code-mitigations --mojo-platform-channel-handle=3316 /prefetch:1
              2⤵
                PID:4400
              • C:\Program Files (x86)\Microsoft\Edge\Application\92.0.902.67\identity_helper.exe
                "C:\Program Files (x86)\Microsoft\Edge\Application\92.0.902.67\identity_helper.exe" --type=utility --utility-sub-type=winrt_app_id.mojom.WinrtAppIdService --field-trial-handle=2184,13249538675625618260,11344057943488026144,131072 --lang=en-US --service-sandbox-type=none --mojo-platform-channel-handle=5392 /prefetch:8
                2⤵
                  PID:4796
                • C:\Program Files (x86)\Microsoft\Edge\Application\92.0.902.67\identity_helper.exe
                  "C:\Program Files (x86)\Microsoft\Edge\Application\92.0.902.67\identity_helper.exe" --type=utility --utility-sub-type=winrt_app_id.mojom.WinrtAppIdService --field-trial-handle=2184,13249538675625618260,11344057943488026144,131072 --lang=en-US --service-sandbox-type=none --mojo-platform-channel-handle=5392 /prefetch:8
                  2⤵
                  • Suspicious behavior: EnumeratesProcesses
                  PID:3772
                • 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=2184,13249538675625618260,11344057943488026144,131072 --lang=en-US --service-sandbox-type=collections --mojo-platform-channel-handle=4724 /prefetch:8
                  2⤵
                    PID:2864
                  • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
                    "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=renderer --field-trial-handle=2184,13249538675625618260,11344057943488026144,131072 --lang=en-US --disable-client-side-phishing-detection --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=10 --no-v8-untrusted-code-mitigations --mojo-platform-channel-handle=4760 /prefetch:1
                    2⤵
                      PID:2884
                    • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
                      "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=quarantine.mojom.Quarantine --field-trial-handle=2184,13249538675625618260,11344057943488026144,131072 --lang=en-US --service-sandbox-type=none --mojo-platform-channel-handle=5192 /prefetch:8
                      2⤵
                      • Suspicious behavior: EnumeratesProcesses
                      PID:4476
                    • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
                      "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=renderer --field-trial-handle=2184,13249538675625618260,11344057943488026144,131072 --lang=en-US --disable-client-side-phishing-detection --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=12 --no-v8-untrusted-code-mitigations --mojo-platform-channel-handle=5944 /prefetch:1
                      2⤵
                        PID:4292
                      • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
                        "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=renderer --field-trial-handle=2184,13249538675625618260,11344057943488026144,131072 --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=13 --no-v8-untrusted-code-mitigations --mojo-platform-channel-handle=6112 /prefetch:1
                        2⤵
                          PID:4396
                        • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
                          "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=renderer --field-trial-handle=2184,13249538675625618260,11344057943488026144,131072 --lang=en-US --disable-client-side-phishing-detection --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=14 --no-v8-untrusted-code-mitigations --mojo-platform-channel-handle=5656 /prefetch:1
                          2⤵
                            PID:4644
                          • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
                            "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=renderer --field-trial-handle=2184,13249538675625618260,11344057943488026144,131072 --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=15 --no-v8-untrusted-code-mitigations --mojo-platform-channel-handle=5512 /prefetch:1
                            2⤵
                              PID:4696
                          • C:\Windows\System32\CompPkgSrv.exe
                            C:\Windows\System32\CompPkgSrv.exe -Embedding
                            1⤵
                              PID:5020
                            • C:\Windows\System32\CompPkgSrv.exe
                              C:\Windows\System32\CompPkgSrv.exe -Embedding
                              1⤵
                                PID:4588
                              • C:\Windows\System32\rundll32.exe
                                C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
                                1⤵
                                  PID:1300
                                • C:\Users\Admin\Downloads\Byfron-Bypasser-main\Byfron-Bypasser-main\Byfron Bypass Launcher.exe
                                  "C:\Users\Admin\Downloads\Byfron-Bypasser-main\Byfron-Bypasser-main\Byfron Bypass Launcher.exe"
                                  1⤵
                                  • Suspicious use of AdjustPrivilegeToken
                                  PID:3428
                                  • C:\Windows\SYSTEM32\schtasks.exe
                                    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
                                    2⤵
                                    • Creates scheduled task(s)
                                    PID:1960
                                  • 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 FindShellTrayWindow
                                    • Suspicious use of SendNotifyMessage
                                    PID:5020
                                    • C:\Windows\SYSTEM32\schtasks.exe
                                      "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
                                      3⤵
                                      • Creates scheduled task(s)
                                      PID:4744
                                • C:\Users\Admin\Downloads\Byfron-Bypasser-main\Byfron-Bypasser-main\Byfron Bypass Launcher.exe
                                  "C:\Users\Admin\Downloads\Byfron-Bypasser-main\Byfron-Bypasser-main\Byfron Bypass Launcher.exe"
                                  1⤵
                                  • Suspicious use of AdjustPrivilegeToken
                                  PID:4292

                                Network

                                MITRE ATT&CK Enterprise v15

                                Replay Monitor

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                                Downloads

                                • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Byfron Bypass Launcher.exe.log

                                  Filesize

                                  1KB

                                  MD5

                                  baf55b95da4a601229647f25dad12878

                                  SHA1

                                  abc16954ebfd213733c4493fc1910164d825cac8

                                  SHA256

                                  ee954c5d8156fd8890e582c716e5758ed9b33721258f10e758bdc31ccbcb1924

                                  SHA512

                                  24f502fedb1a305d0d7b08857ffc1db9b2359ff34e06d5748ecc84e35c985f29a20d9f0a533bea32d234ab37097ec0481620c63b14ac89b280e75e14d19fd545

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

                                  Filesize

                                  152B

                                  MD5

                                  f61fa5143fe872d1d8f1e9f8dc6544f9

                                  SHA1

                                  df44bab94d7388fb38c63085ec4db80cfc5eb009

                                  SHA256

                                  284a24b5b40860240db00ef3ae6a33c9fa8349ab5490a634e27b2c6e9a191c64

                                  SHA512

                                  971000784a6518bb39c5cf043292c7ab659162275470f5f6b632ea91a6bcae83bc80517ceb983dd5abfe8fb4e157344cb65c27e609a879eec00b33c5fad563a6

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

                                  Filesize

                                  152B

                                  MD5

                                  87f7abeb82600e1e640b843ad50fe0a1

                                  SHA1

                                  045bbada3f23fc59941bf7d0210fb160cb78ae87

                                  SHA256

                                  b35d6906050d90a81d23646f86c20a8f5d42f058ffc6436fb0a2b8bd71ee1262

                                  SHA512

                                  ea8e7f24ab823ad710ce079c86c40aa957353a00d2775732c23e31be88a10d212e974c4691279aa86016c4660f5795febf739a15207833df6ed964a9ed99d618

                                • C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Default\Code Cache\js\index-dir\the-real-index

                                  Filesize

                                  1KB

                                  MD5

                                  1a288e14cb55ad28693fd7919b5c3167

                                  SHA1

                                  ed4cbab3abef5063d696c52bbb122780633f81d4

                                  SHA256

                                  96bc91d8583090e73c044f6065b5ce127fb9287ac864125add4ff23b2b366e3f

                                  SHA512

                                  7a2ad8a442386fdf16922feff43e20a4f8cbc5c6b5570181f62fa6050469740bcd3785d7628ab5513cd347eb34627986aca33ed8c14b3411aa31f6181fde4423

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

                                  Filesize

                                  6KB

                                  MD5

                                  fa6a4665b9fa2758a3e19ecc4971ebd5

                                  SHA1

                                  2822e8bc14e921f813f0b8dfa865501b28163ffe

                                  SHA256

                                  99dfd639136b3a8ce6a6575766a44530accb4736eac96d2635db824bfa2eafa3

                                  SHA512

                                  7e8651191a8ecb1378c5fbdebc37b95e8d64ede24b2f4c33d77135c8d293d50cce08e63f5935e8d9864a335277fc1e617fa4444bcabb9195ce761e61372ad4af

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

                                  Filesize

                                  6KB

                                  MD5

                                  d2fe7e9ef546b8f2201e6906d808fc14

                                  SHA1

                                  a44ad4f17ad0f6a8e402b2f2b7b15079028c839a

                                  SHA256

                                  649acd8241f873e783ea3f5b4d877e47ec270a9a53660af0f792be7d66a9f8a6

                                  SHA512

                                  63b4931b1c43b20a3b60d47b721d3f9c851161740454eb72c66d00faef25993e88f91c2eed8eda68d2b4606b8308c5b408502c2ff5f985935e1a1bcf8d62d335

                                • 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\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\Local State

                                  Filesize

                                  11KB

                                  MD5

                                  7776aca4dc2e3accf6fbb1d9b337bea1

                                  SHA1

                                  7b3255e41d6fd219f8890de94dc969f678ecd2fb

                                  SHA256

                                  30ab29c56463286ba7de510f45d6279e745984fa5d14915660a40759bb72db67

                                  SHA512

                                  a60a21f2cedb2b537af2bb9477de8ada4650ba84e7e3fc44a2501b493c348f02751d5c5764a6f8b5eba6f4197098ff143c9d55ae209c6595a9672a34aeb8b151

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

                                  Filesize

                                  11KB

                                  MD5

                                  bdfcb8fb8a0164fcb065a477d6169261

                                  SHA1

                                  1a402aec24548a1d80b1e3f2d7ca273e8d3f5b35

                                  SHA256

                                  6dd0a73b92f924e723fb713d1225a485e8c82826eeab47a50900870572ee28bb

                                  SHA512

                                  a47cae445f0c83f0eb66080b88949000ee43f2142a45509d56855fb602111a37df84023b421559a6dfd2c1e187bc032dfa885355e2b9c8d0abe0d8fb9f91c5fd

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

                                  Filesize

                                  3.1MB

                                  MD5

                                  571ee05d080ae18e48d4fd6ec2ae91b4

                                  SHA1

                                  0415b6f4b4e851775af295d978627e5cd5b02580

                                  SHA256

                                  3e0af01df095a209fa5c01e084e0839830a42355354eb68cf3a4f0ec229bbc54

                                  SHA512

                                  f15ac943695216225ad18eb7eaea97e75fbf603dce8d6e2fc72db2c2b36baa0b5eba3e05ea1a18ea068c1d6247ce0fcc404ae8101b84f0522d2acc8aa15aae28

                                • C:\Users\Admin\Downloads\Byfron-Bypasser-main.zip

                                  Filesize

                                  2.0MB

                                  MD5

                                  4f8a580a43bb67f693fbf44fed852d89

                                  SHA1

                                  885c384b6e527f7eda4ce5208ca077af23021880

                                  SHA256

                                  baa761893b1a2b181fedcae9fa6648c95785fdc1da65cb8a7967863f23e6061d

                                  SHA512

                                  64e8cc9241aa7e3a9bfa4ea680b3dadf66d2db7fbaa288d153b03ec28c1150810be563da4e9c535800f3958f163ff6c8155d11cd38ebb651ecec53538ce37fd0

                                • \??\pipe\LOCAL\crashpad_3352_QNALIZJUAOYCLKOP

                                  MD5

                                  d41d8cd98f00b204e9800998ecf8427e

                                  SHA1

                                  da39a3ee5e6b4b0d3255bfef95601890afd80709

                                  SHA256

                                  e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855

                                  SHA512

                                  cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e

                                • memory/3428-178-0x0000000000E50000-0x0000000001174000-memory.dmp

                                  Filesize

                                  3.1MB

                                • memory/5020-192-0x000000001C100000-0x000000001C150000-memory.dmp

                                  Filesize

                                  320KB

                                • memory/5020-193-0x000000001C210000-0x000000001C2C2000-memory.dmp

                                  Filesize

                                  712KB