Analysis

  • max time kernel
    1032s
  • max time network
    1042s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    17/04/2024, 15:18

General

  • Target
    Client-built.exe
  • Size 3.1MB
  • Sample240417-spm4ssdf86
  • SHA256 5bc8c6aa7ccb11de2b19cabc08c096025da18e7898c5e8227ef109c266820f82
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • quasar

Version
  • 1.4.1

Botnet
  • Office04

C2
  • 192.168.1.240:4782

Mutex
  • fcdb4cfb-dc40-4f51-b2c7-f723b5404e35

Attributes
  • encryption_key

    1074AFFC8845D6B93DCAD37B9C170AE9CD58D08A

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Windowsstartup

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 3 IoCs
  • Executes dropped EXE 1 IoCs
  • 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 Internet Explorer settings 1 TTPs 35 IoCs
  • Suspicious behavior: EnumeratesProcesses 3 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of FindShellTrayWindow 36 IoCs
  • Suspicious use of SendNotifyMessage 32 IoCs
  • Suspicious use of SetWindowsHookEx 15 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:2732
    • C:\Windows\system32\schtasks.exe
      "schtasks" /create /tn "Windowsstartup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:2904
    • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious behavior: GetForegroundWindowSpam
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:2664
      • C:\Windows\system32\schtasks.exe
        "schtasks" /create /tn "Windowsstartup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:2660
  • C:\Windows\explorer.exe
    "C:\Windows\explorer.exe"
    1⤵
      PID:2948
    • C:\Program Files\Google\Chrome\Application\chrome.exe
      "C:\Program Files\Google\Chrome\Application\chrome.exe"
      1⤵
      • Enumerates system info in registry
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      • Suspicious use of WriteProcessMemory
      PID:2184
      • C:\Program Files\Google\Chrome\Application\chrome.exe
        "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=crashpad-handler "--user-data-dir=C:\Users\Admin\AppData\Local\Google\Chrome\User Data" /prefetch:7 --monitor-self-annotation=ptype=crashpad-handler "--database=C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Crashpad" "--metrics-dir=C:\Users\Admin\AppData\Local\Google\Chrome\User Data" --url=https://clients2.google.com/cr/report --annotation=channel= --annotation=plat=Win64 --annotation=prod=Chrome --annotation=ver=106.0.5249.119 --initial-client-data=0xc0,0xc4,0xc8,0x94,0xcc,0x7feee179758,0x7feee179768,0x7feee179778
        2⤵
          PID:900
        • C:\Program Files\Google\Chrome\Application\chrome.exe
          "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=gpu-process --gpu-preferences=UAAAAAAAAADgAAAYAAAAAAAAAAAAAAAAAABgAAAAAAAwAAAAAAAAAAAAAAAQAAAAAAAAAAAAAAAAAAAAAAAAAEgAAAAAAAAASAAAAAAAAAAYAAAAAgAAABAAAAAAAAAAGAAAAAAAAAAQAAAAAAAAAAAAAAAOAAAAEAAAAAAAAAABAAAADgAAAAgAAAAAAAAACAAAAAAAAAA= --mojo-platform-channel-handle=1176 --field-trial-handle=1148,i,4498509610772567175,15961627691273312008,131072 /prefetch:2
          2⤵
            PID:1232
          • C:\Program Files\Google\Chrome\Application\chrome.exe
            "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --mojo-platform-channel-handle=1512 --field-trial-handle=1148,i,4498509610772567175,15961627691273312008,131072 /prefetch:8
            2⤵
              PID:1156
            • C:\Program Files\Google\Chrome\Application\chrome.exe
              "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=utility --utility-sub-type=storage.mojom.StorageService --lang=en-US --service-sandbox-type=utility --mojo-platform-channel-handle=1608 --field-trial-handle=1148,i,4498509610772567175,15961627691273312008,131072 /prefetch:8
              2⤵
                PID:2816
              • C:\Program Files\Google\Chrome\Application\chrome.exe
                "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=renderer --display-capture-permissions-policy-allowed --first-renderer-process --lang=en-US --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=6 --mojo-platform-channel-handle=2188 --field-trial-handle=1148,i,4498509610772567175,15961627691273312008,131072 /prefetch:1
                2⤵
                  PID:1868
                • C:\Program Files\Google\Chrome\Application\chrome.exe
                  "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=renderer --display-capture-permissions-policy-allowed --lang=en-US --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=5 --mojo-platform-channel-handle=2196 --field-trial-handle=1148,i,4498509610772567175,15961627691273312008,131072 /prefetch:1
                  2⤵
                    PID:2032
                  • C:\Program Files\Google\Chrome\Application\chrome.exe
                    "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=gpu-process --gpu-preferences=UAAAAAAAAADgAAAYAAAAAAAAAAAAAAAAAABgAAAAAAAwAAAAAAAAAAAAAAAQAAAAAAAAAAAAAAAAAAAAAAAAAEgAAAAAAAAASAAAAAAAAAAYAAAAAgAAABAAAAAAAAAAGAAAAAAAAAAQAAAAAAAAAAAAAAAOAAAAEAAAAAAAAAABAAAADgAAAAgAAAAAAAAACAAAAAAAAAA= --use-gl=angle --use-angle=swiftshader-webgl --mojo-platform-channel-handle=1404 --field-trial-handle=1148,i,4498509610772567175,15961627691273312008,131072 /prefetch:2
                    2⤵
                      PID:1708
                    • C:\Program Files\Google\Chrome\Application\chrome.exe
                      "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=renderer --display-capture-permissions-policy-allowed --disable-gpu-compositing --lang=en-US --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=8 --mojo-platform-channel-handle=1340 --field-trial-handle=1148,i,4498509610772567175,15961627691273312008,131072 /prefetch:1
                      2⤵
                        PID:2912
                      • C:\Program Files\Google\Chrome\Application\chrome.exe
                        "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=utility --utility-sub-type=data_decoder.mojom.DataDecoderService --lang=en-US --service-sandbox-type=service --mojo-platform-channel-handle=3448 --field-trial-handle=1148,i,4498509610772567175,15961627691273312008,131072 /prefetch:8
                        2⤵
                          PID:860
                        • C:\Program Files\Google\Chrome\Application\chrome.exe
                          "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=utility --utility-sub-type=data_decoder.mojom.DataDecoderService --lang=en-US --service-sandbox-type=service --mojo-platform-channel-handle=3576 --field-trial-handle=1148,i,4498509610772567175,15961627691273312008,131072 /prefetch:8
                          2⤵
                            PID:2684
                          • C:\Program Files\Google\Chrome\Application\chrome.exe
                            "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=utility --utility-sub-type=chrome.mojom.UtilWin --lang=en-US --service-sandbox-type=none --mojo-platform-channel-handle=3660 --field-trial-handle=1148,i,4498509610772567175,15961627691273312008,131072 /prefetch:8
                            2⤵
                              PID:2492
                          • C:\Program Files\Google\Chrome\Application\106.0.5249.119\elevation_service.exe
                            "C:\Program Files\Google\Chrome\Application\106.0.5249.119\elevation_service.exe"
                            1⤵
                              PID:2408
                            • C:\Program Files\Internet Explorer\iexplore.exe
                              "C:\Program Files\Internet Explorer\iexplore.exe"
                              1⤵
                              • Modifies Internet Explorer settings
                              • Suspicious behavior: EnumeratesProcesses
                              • Suspicious use of FindShellTrayWindow
                              • Suspicious use of SetWindowsHookEx
                              PID:2720
                              • C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE
                                "C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE" SCODEF:2720 CREDAT:275457 /prefetch:2
                                2⤵
                                • Modifies Internet Explorer settings
                                • Suspicious use of SetWindowsHookEx
                                PID:2428
                              • C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE
                                "C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE" SCODEF:2720 CREDAT:209938 /prefetch:2
                                2⤵
                                • Modifies Internet Explorer settings
                                • Suspicious use of SetWindowsHookEx
                                PID:1092
                            • C:\Windows\explorer.exe
                              "C:\Windows\explorer.exe"
                              1⤵
                                PID:2804
                              • C:\Windows\system32\AUDIODG.EXE
                                C:\Windows\system32\AUDIODG.EXE 0x4f8
                                1⤵
                                  PID:1548

                                Network

                                      MITRE ATT&CK Enterprise v15

                                      Replay Monitor

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                                      Downloads

                                      94308059B57B3142E455B38A6EB92015

                                      • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\94308059B57B3142E455B38A6EB92015
                                      • Size 68KB
                                      • SHA256 1ed81fa8dfb6999a9fedc6e779138ffd99568992e22d300acd181a6d2c8de184
                                      • MD5 SHA1 SHA512 SSDEEP

                                      94308059B57B3142E455B38A6EB92015

                                      • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
                                      • Size 344B
                                      • SHA256 6c58522a9a7ea366ceab394b23c5729ac500e6461f29c0d0ef0bac8e7e76da2d
                                      • MD5 SHA1 SHA512

                                      94308059B57B3142E455B38A6EB92015

                                      • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
                                      • Size 344B
                                      • SHA256 61e6f25c3bb4145a7dc3f8b090b71e34fe3672bb4ca7f8ba86d4482735823f25
                                      • MD5 SHA1 SHA512

                                      94308059B57B3142E455B38A6EB92015

                                      • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
                                      • Size 344B
                                      • SHA256 931b2177b1b975c63562e9466d85ba24be5da00e938c71d3819a4eaa4b67483a
                                      • MD5 SHA1 SHA512

                                      94308059B57B3142E455B38A6EB92015

                                      • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
                                      • Size 344B
                                      • SHA256 d297c84100c593d81826ba461c6b445e47a9861df79a80e4822fe9e46c619e95
                                      • MD5 SHA1 SHA512

                                      94308059B57B3142E455B38A6EB92015

                                      • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
                                      • Size 344B
                                      • SHA256 15b0fbc83c71be7422f17cb32c4d075fdcc2010d85e15dfe2981f3cf6f9c4133
                                      • MD5 SHA1 SHA512

                                      94308059B57B3142E455B38A6EB92015

                                      • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
                                      • Size 344B
                                      • SHA256 f12dc38796ed011e3c98c9758c1a9b8ab2ba2d8b5a781600a083ca5af2925bf1
                                      • MD5 SHA1 SHA512

                                      94308059B57B3142E455B38A6EB92015

                                      • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
                                      • Size 344B
                                      • SHA256 66b970bdfebe4f3486a2ecf6a94ad9702679fc1d1d77ddc46cce7a14a6f24344
                                      • MD5 SHA1 SHA512

                                      94308059B57B3142E455B38A6EB92015

                                      • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
                                      • Size 344B
                                      • SHA256 4961bc563f08171bac4f760708204415aa82abc3e21773d17c51396b09f6e476
                                      • MD5 SHA1 SHA512

                                      94308059B57B3142E455B38A6EB92015

                                      • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
                                      • Size 344B
                                      • SHA256 9bf43f80cf4206c6c88ab333a4894ce687392d7ba6f3f1fa541a58a2fe076bd5
                                      • MD5 SHA1 SHA512

                                      1f01833b-28c5-47fa-9120-68dd00224722.tmp

                                      • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\1f01833b-28c5-47fa-9120-68dd00224722.tmp
                                      • Size 264KB
                                      • SHA256 af07b1d542962f430e02acd29b492e0fabeede995b235acfe83b34b41e23d12e
                                      • MD5 SHA1 SHA512 SSDEEP

                                      000006.dbtmp

                                      • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\GCM Store\Encryption\000006.dbtmp
                                      • Size 16B
                                      • SHA256 4166bf17b2da789b0d0cc5c74203041d98005f5d4ef88c27e8281e00148cd611
                                      • MD5 SHA1 SHA512

                                      data_1

                                      • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\GPUCache\data_1
                                      • Size 264KB
                                      • SHA256 b1e963d702392fb7224786e7d56d43973e9b9efd1b89c17814d7c558ffc0cdec
                                      • MD5 SHA1 SHA512 SSDEEP

                                      Preferences

                                      • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Preferences
                                      • Size 5KB
                                      • SHA256 71eec5739e1c1f0f5b75d78c55c23bffbf62c85775e6bdcb7d5f1c61a0aa1f4a
                                      • MD5 SHA1 SHA512 SSDEEP

                                      Preferences

                                      • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Preferences
                                      • Size 5KB
                                      • SHA256 6b7512776078c207e7bb635d355e5bbf53088638eb9bed566d0092bf7ac12495
                                      • MD5 SHA1 SHA512 SSDEEP

                                      Preferences

                                      • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Preferences
                                      • Size 5KB
                                      • SHA256 671eb917cfb3ef8d4c1c6dfc859ff424d3b68239abdbeead42fd14521f059d72
                                      • MD5 SHA1 SHA512 SSDEEP

                                      000007.dbtmp

                                      • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Site Characteristics Database\000007.dbtmp
                                      • Size 16B
                                      • SHA256 8af72f43857550b01eab1019335772b367a17a9884a7a759fdf4fe6f272b90aa
                                      • MD5 SHA1 SHA512

                                      Local State

                                      • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Local State
                                      • Size 264KB
                                      • SHA256 0ea8aa3113a0024fdc6f0b9affff698b9f18f61e658ab132c811afcbf2d24f57
                                      • MD5 SHA1 SHA512 SSDEEP

                                      qsml[1].xml

                                      • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\EDQW9R5V\qsml[1].xml
                                      • Size 601B
                                      • SHA256 4e73d6ff38214f43dc41d85ce1c9c8d61ea842d1db20eae5f1a21c0e09c99454
                                      • MD5 SHA1 SHA512

                                      qsml[2].xml

                                      • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\EDQW9R5V\qsml[2].xml
                                      • Size 610B
                                      • SHA256 e2f18b1a6b5db2451c94083e09a93c8542d2be4434aab0993cb7f5e22f46fc02
                                      • MD5 SHA1 SHA512

                                      qsml[3].xml

                                      • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\EDQW9R5V\qsml[3].xml
                                      • Size 611B
                                      • SHA256 e2ecffea9da045ebbf5ba4faa746ebea2c8af1a8759c830d5362251e3add3a59
                                      • MD5 SHA1 SHA512

                                      qsml[4].xml

                                      • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\EDQW9R5V\qsml[4].xml
                                      • Size 612B
                                      • SHA256 d4e5aa8c00d29970694212209cfb782168ad2bfcca178544a750ec970cb3c119
                                      • MD5 SHA1 SHA512

                                      Cab6911.tmp

                                      • Path C:\Users\Admin\AppData\Local\Temp\Cab6911.tmp
                                      • Size 65KB
                                      • SHA256 c6456e12e5e53287a547af4103e0397cb9697e466cf75844312dc296d43d144d
                                      • MD5 SHA1 SHA512 SSDEEP

                                      Tar69F4.tmp

                                      • Path C:\Users\Admin\AppData\Local\Temp\Tar69F4.tmp
                                      • Size 177KB
                                      • SHA256 67dc37ed50b8e63272b49a254a6039ee225974f1d767bb83eb1fd80e759a7c34
                                      • MD5 SHA1 SHA512 SSDEEP

                                      ~DFFB7CAF65A4A8DF72.TMP

                                      • Path C:\Users\Admin\AppData\Local\Temp\~DFFB7CAF65A4A8DF72.TMP
                                      • Size 16KB
                                      • SHA256 27983beb2999ff35b9835c4de0d5ec424e1cacfe131d1082e2fed82eadc5766c
                                      • MD5 SHA1 SHA512 SSDEEP

                                      PZGWOGHY.txt

                                      • Path C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Cookies\PZGWOGHY.txt
                                      • Size 499B
                                      • SHA256 3cded7c965508b61646eaa7c12a145411fdb5bf4e98da371abea3dc45ea9be0e
                                      • MD5 SHA1 SHA512

                                      Client.exe

                                      • Path C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                                      • Size 3.1MB
                                      • SHA256 5bc8c6aa7ccb11de2b19cabc08c096025da18e7898c5e8227ef109c266820f82
                                      • MD5 SHA1 SHA512 SSDEEP

                                      memory/2664-11-0x000007FEF5540000-0x000007FEF5F2C000-memory.dmp

                                      memory/2664-7-0x000007FEF5540000-0x000007FEF5F2C000-memory.dmp

                                      memory/2664-9-0x0000000000910000-0x0000000000C34000-memory.dmp

                                      memory/2664-10-0x000000001B480000-0x000000001B500000-memory.dmp

                                      memory/2664-12-0x000000001B480000-0x000000001B500000-memory.dmp

                                      memory/2732-2-0x000000001B1E0000-0x000000001B260000-memory.dmp

                                      memory/2732-1-0x000007FEF5540000-0x000007FEF5F2C000-memory.dmp

                                      memory/2732-8-0x000007FEF5540000-0x000007FEF5F2C000-memory.dmp

                                      memory/2732-0-0x0000000000E50000-0x0000000001174000-memory.dmp