Analysis
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max time kernel
63s -
max time network
132s -
platform
windows10-2004_x64 -
resource
win10v2004-20220812-en -
resource tags
arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system -
submitted
15-09-2022 15:38
Behavioral task
behavioral1
Sample
ReminderLetter_8468122_D01_1.pdf
Resource
win7-20220901-en
Behavioral task
behavioral2
Sample
ReminderLetter_8468122_D01_1.pdf
Resource
win10v2004-20220812-en
General
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Target
ReminderLetter_8468122_D01_1.pdf
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Size
132KB
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MD5
c043cf8a80eac01b6d816fcbb9e3d1f8
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SHA1
7a265829c82f868aea271dd2d1301ed0b12c348d
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SHA256
b6304ba42995fb53ae35079d18ba46b95481964fd5012ee6fdeb61a0244444bd
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SHA512
064aad8a8074b4ebb5e1db7e26b631b213ad96e24261d77f9b58e9865ba95000d395783316e892a3722e155aee610587e887920a03ed675421edc70a6aa7d594
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SSDEEP
3072:LW0AIOYBEFUYkCIAY0CmJvfFQg5DnAFW9ue6yTkyelw:SP/amjQZkdFTkyeq
Malware Config
Signatures
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Checks processor information in registry 2 TTPs 2 IoCs
Processor information is often read in order to detect sandboxing environments.
Processes:
AcroRd32.exedescription ioc process Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 AcroRd32.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz AcroRd32.exe -
Processes:
AcroRd32.exedescription ioc process Key created \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BROWSER_EMULATION AcroRd32.exe -
Suspicious behavior: EnumeratesProcesses 20 IoCs
Processes:
AcroRd32.exepid process 3440 AcroRd32.exe 3440 AcroRd32.exe 3440 AcroRd32.exe 3440 AcroRd32.exe 3440 AcroRd32.exe 3440 AcroRd32.exe 3440 AcroRd32.exe 3440 AcroRd32.exe 3440 AcroRd32.exe 3440 AcroRd32.exe 3440 AcroRd32.exe 3440 AcroRd32.exe 3440 AcroRd32.exe 3440 AcroRd32.exe 3440 AcroRd32.exe 3440 AcroRd32.exe 3440 AcroRd32.exe 3440 AcroRd32.exe 3440 AcroRd32.exe 3440 AcroRd32.exe -
Suspicious use of FindShellTrayWindow 1 IoCs
Processes:
AcroRd32.exepid process 3440 AcroRd32.exe -
Suspicious use of SetWindowsHookEx 6 IoCs
Processes:
AcroRd32.exepid process 3440 AcroRd32.exe 3440 AcroRd32.exe 3440 AcroRd32.exe 3440 AcroRd32.exe 3440 AcroRd32.exe 3440 AcroRd32.exe -
Suspicious use of WriteProcessMemory 64 IoCs
Processes:
AcroRd32.exeRdrCEF.exedescription pid process target process PID 3440 wrote to memory of 4792 3440 AcroRd32.exe RdrCEF.exe PID 3440 wrote to memory of 4792 3440 AcroRd32.exe RdrCEF.exe PID 3440 wrote to memory of 4792 3440 AcroRd32.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 1180 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 3912 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 3912 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 3912 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 3912 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 3912 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 3912 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 3912 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 3912 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 3912 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 3912 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 3912 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 3912 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 3912 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 3912 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 3912 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 3912 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 3912 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 3912 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 3912 4792 RdrCEF.exe RdrCEF.exe PID 4792 wrote to memory of 3912 4792 RdrCEF.exe RdrCEF.exe
Processes
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C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroRd32.exe"C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroRd32.exe" "C:\Users\Admin\AppData\Local\Temp\ReminderLetter_8468122_D01_1.pdf"1⤵
- Checks processor information in registry
- Modifies Internet Explorer settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of FindShellTrayWindow
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
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C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe"C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe" --backgroundcolor=165140432⤵
- Suspicious use of WriteProcessMemory
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C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe"C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe" --type=gpu-process --disable-pack-loading --lang=en-US --log-file="C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\debug.log" --log-severity=disable --product-version="ReaderServices/19.10.20064 Chrome/64.0.3282.119" --gpu-preferences=GAAAAAAAAAAAB4AAAQAAAAAAAAAAAGAA --use-gl=swiftshader-webgl --gpu-vendor-id=0x1234 --gpu-device-id=0x1111 --gpu-driver-vendor="Google Inc." --gpu-driver-version=3.3.0.2 --gpu-driver-date=2017/04/07 --disable-pack-loading --lang=en-US --log-file="C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\debug.log" --log-severity=disable --product-version="ReaderServices/19.10.20064 Chrome/64.0.3282.119" --service-request-channel-token=6B6055F344C6CE751B0D6D2C52CE6E05 --mojo-platform-channel-handle=1736 --allow-no-sandbox-job --ignored=" --type=renderer " /prefetch:23⤵
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C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe"C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe" --type=renderer --disable-browser-side-navigation --disable-gpu-compositing --service-pipe-token=F96A15395C32884029EEF3BDBA1A809B --lang=en-US --disable-pack-loading --lang=en-US --log-file="C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\debug.log" --log-severity=disable --product-version="ReaderServices/19.10.20064 Chrome/64.0.3282.119" --enable-pinch --device-scale-factor=1 --num-raster-threads=1 --enable-gpu-async-worker-context --content-image-texture-target=0,0,3553;0,1,3553;0,2,3553;0,3,3553;0,4,3553;0,5,3553;0,6,3553;0,7,3553;0,8,3553;0,9,3553;0,10,3553;0,11,3553;0,12,3553;0,13,3553;0,14,3553;0,15,3553;0,16,3553;0,17,3553;0,18,3553;1,0,3553;1,1,3553;1,2,3553;1,3,3553;1,4,3553;1,5,3553;1,6,3553;1,7,3553;1,8,3553;1,9,3553;1,10,3553;1,11,3553;1,12,3553;1,13,3553;1,14,3553;1,15,3553;1,16,3553;1,17,3553;1,18,3553;2,0,3553;2,1,3553;2,2,3553;2,3,3553;2,4,3553;2,5,3553;2,6,3553;2,7,3553;2,8,3553;2,9,3553;2,10,3553;2,11,3553;2,12,3553;2,13,3553;2,14,3553;2,15,3553;2,16,3553;2,17,3553;2,18,3553;3,0,3553;3,1,3553;3,2,3553;3,3,3553;3,4,3553;3,5,3553;3,6,3553;3,7,3553;3,8,3553;3,9,3553;3,10,3553;3,11,3553;3,12,3553;3,13,3553;3,14,3553;3,15,3553;3,16,3553;3,17,3553;3,18,3553;4,0,3553;4,1,3553;4,2,3553;4,3,3553;4,4,3553;4,5,3553;4,6,3553;4,7,3553;4,8,3553;4,9,3553;4,10,3553;4,11,3553;4,12,3553;4,13,3553;4,14,3553;4,15,3553;4,16,3553;4,17,3553;4,18,3553;5,0,3553;5,1,3553;5,2,3553;5,3,3553;5,4,3553;5,5,3553;5,6,3553;5,7,3553;5,8,3553;5,9,3553;5,10,3553;5,11,3553;5,12,3553;5,13,3553;5,14,3553;5,15,3553;5,16,3553;5,17,3553;5,18,3553;6,0,3553;6,1,3553;6,2,3553;6,3,3553;6,4,3553;6,5,3553;6,6,3553;6,7,3553;6,8,3553;6,9,3553;6,10,3553;6,11,3553;6,12,3553;6,13,3553;6,14,3553;6,15,3553;6,16,3553;6,17,3553;6,18,3553 --disable-accelerated-video-decode --service-request-channel-token=F96A15395C32884029EEF3BDBA1A809B --renderer-client-id=2 --mojo-platform-channel-handle=1744 --allow-no-sandbox-job /prefetch:13⤵
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C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe"C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe" --type=renderer --disable-browser-side-navigation --disable-gpu-compositing --service-pipe-token=E3237AD5794F93C2E23C13641339A90B --lang=en-US --disable-pack-loading --lang=en-US --log-file="C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\debug.log" --log-severity=disable --product-version="ReaderServices/19.10.20064 Chrome/64.0.3282.119" --enable-pinch --device-scale-factor=1 --num-raster-threads=1 --enable-gpu-async-worker-context --content-image-texture-target=0,0,3553;0,1,3553;0,2,3553;0,3,3553;0,4,3553;0,5,3553;0,6,3553;0,7,3553;0,8,3553;0,9,3553;0,10,3553;0,11,3553;0,12,3553;0,13,3553;0,14,3553;0,15,3553;0,16,3553;0,17,3553;0,18,3553;1,0,3553;1,1,3553;1,2,3553;1,3,3553;1,4,3553;1,5,3553;1,6,3553;1,7,3553;1,8,3553;1,9,3553;1,10,3553;1,11,3553;1,12,3553;1,13,3553;1,14,3553;1,15,3553;1,16,3553;1,17,3553;1,18,3553;2,0,3553;2,1,3553;2,2,3553;2,3,3553;2,4,3553;2,5,3553;2,6,3553;2,7,3553;2,8,3553;2,9,3553;2,10,3553;2,11,3553;2,12,3553;2,13,3553;2,14,3553;2,15,3553;2,16,3553;2,17,3553;2,18,3553;3,0,3553;3,1,3553;3,2,3553;3,3,3553;3,4,3553;3,5,3553;3,6,3553;3,7,3553;3,8,3553;3,9,3553;3,10,3553;3,11,3553;3,12,3553;3,13,3553;3,14,3553;3,15,3553;3,16,3553;3,17,3553;3,18,3553;4,0,3553;4,1,3553;4,2,3553;4,3,3553;4,4,3553;4,5,3553;4,6,3553;4,7,3553;4,8,3553;4,9,3553;4,10,3553;4,11,3553;4,12,3553;4,13,3553;4,14,3553;4,15,3553;4,16,3553;4,17,3553;4,18,3553;5,0,3553;5,1,3553;5,2,3553;5,3,3553;5,4,3553;5,5,3553;5,6,3553;5,7,3553;5,8,3553;5,9,3553;5,10,3553;5,11,3553;5,12,3553;5,13,3553;5,14,3553;5,15,3553;5,16,3553;5,17,3553;5,18,3553;6,0,3553;6,1,3553;6,2,3553;6,3,3553;6,4,3553;6,5,3553;6,6,3553;6,7,3553;6,8,3553;6,9,3553;6,10,3553;6,11,3553;6,12,3553;6,13,3553;6,14,3553;6,15,3553;6,16,3553;6,17,3553;6,18,3553 --disable-accelerated-video-decode --service-request-channel-token=E3237AD5794F93C2E23C13641339A90B --renderer-client-id=4 --mojo-platform-channel-handle=2140 --allow-no-sandbox-job /prefetch:13⤵
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C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe"C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe" --type=gpu-process --disable-pack-loading --lang=en-US --log-file="C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\debug.log" --log-severity=disable --product-version="ReaderServices/19.10.20064 Chrome/64.0.3282.119" --gpu-preferences=GAAAAAAAAAAAB4AAAQAAAAAAAAAAAGAA --use-gl=swiftshader-webgl --gpu-vendor-id=0x1234 --gpu-device-id=0x1111 --gpu-driver-vendor="Google Inc." --gpu-driver-version=3.3.0.2 --gpu-driver-date=2017/04/07 --disable-pack-loading --lang=en-US --log-file="C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\debug.log" --log-severity=disable --product-version="ReaderServices/19.10.20064 Chrome/64.0.3282.119" --service-request-channel-token=40A91E6994EDDA253EE16A1BE286B3AE --mojo-platform-channel-handle=2548 --allow-no-sandbox-job --ignored=" --type=renderer " /prefetch:23⤵
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C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe"C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe" --type=gpu-process --disable-pack-loading --lang=en-US --log-file="C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\debug.log" --log-severity=disable --product-version="ReaderServices/19.10.20064 Chrome/64.0.3282.119" --gpu-preferences=GAAAAAAAAAAAB4AAAQAAAAAAAAAAAGAA --use-gl=swiftshader-webgl --gpu-vendor-id=0x1234 --gpu-device-id=0x1111 --gpu-driver-vendor="Google Inc." --gpu-driver-version=3.3.0.2 --gpu-driver-date=2017/04/07 --disable-pack-loading --lang=en-US --log-file="C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\debug.log" --log-severity=disable --product-version="ReaderServices/19.10.20064 Chrome/64.0.3282.119" --service-request-channel-token=716E9F93B599A2FCC4E8E0CF30289545 --mojo-platform-channel-handle=2568 --allow-no-sandbox-job --ignored=" --type=renderer " /prefetch:23⤵
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C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe"C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe" --type=gpu-process --disable-pack-loading --lang=en-US --log-file="C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\debug.log" --log-severity=disable --product-version="ReaderServices/19.10.20064 Chrome/64.0.3282.119" --gpu-preferences=GAAAAAAAAAAAB4AAAQAAAAAAAAAAAGAA --use-gl=swiftshader-webgl --gpu-vendor-id=0x1234 --gpu-device-id=0x1111 --gpu-driver-vendor="Google Inc." --gpu-driver-version=3.3.0.2 --gpu-driver-date=2017/04/07 --disable-pack-loading --lang=en-US --log-file="C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\debug.log" --log-severity=disable --product-version="ReaderServices/19.10.20064 Chrome/64.0.3282.119" --service-request-channel-token=A4B6ABEE233DA4298BCCB263AF35EB45 --mojo-platform-channel-handle=2596 --allow-no-sandbox-job --ignored=" --type=renderer " /prefetch:23⤵
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C:\Windows\System32\CompPkgSrv.exeC:\Windows\System32\CompPkgSrv.exe -Embedding1⤵
Network
MITRE ATT&CK Matrix ATT&CK v6
Replay Monitor
Loading Replay Monitor...
Downloads
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memory/1180-134-0x0000000000000000-mapping.dmp
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memory/1700-153-0x0000000000000000-mapping.dmp
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memory/3912-137-0x0000000000000000-mapping.dmp
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memory/4696-150-0x0000000000000000-mapping.dmp
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memory/4784-147-0x0000000000000000-mapping.dmp
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memory/4792-132-0x0000000000000000-mapping.dmp
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memory/4852-142-0x0000000000000000-mapping.dmp