Analysis
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max time kernel
149s -
max time network
157s -
platform
windows10-2004_x64 -
resource
win10v2004-20240508-en -
resource tags
arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system -
submitted
31-05-2024 15:44
Behavioral task
behavioral1
Sample
nursultan nexgen fix.exe
Resource
win7-20240221-en
General
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Target
nursultan nexgen fix.exe
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Size
1.5MB
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MD5
a3d07c747770c9a471a44446e46e33d5
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SHA1
8340534fb1770bae9660287ddb0496e243efcfe4
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SHA256
16015088c3352a8257f420555e7ce6245aa0e6682deeca79bf7e08c24e1ac3de
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SHA512
307cbdddaa9f426f8ceec060c2c0b1ab5ed3573e327dbcfdda7b1dfd22cf17559f017d835d71bdd15397fa95b0c7dfbfb4cd6b51cd5b2adc1d1cddc8ffe27f99
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SSDEEP
24576:U2G/nvxW3Ww0tpfnNGcvUCxt9groiK5Cg3ZRvm43TzvmF2cK07:UbA30pfnLRRgrheJROuTzvIR
Malware Config
Signatures
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DcRat
DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.
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Process spawned unexpected child process 18 IoCs
This typically indicates the parent process was compromised via an exploit or macro.
Processes:
schtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exedescription pid pid_target process target process Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2464 4380 schtasks.exe Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 3988 4380 schtasks.exe Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 4588 4380 schtasks.exe Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 1016 4380 schtasks.exe Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 1548 4380 schtasks.exe Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 1632 4380 schtasks.exe Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 4980 4380 schtasks.exe Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 3484 4380 schtasks.exe Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 808 4380 schtasks.exe Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 1296 4380 schtasks.exe Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 1180 4380 schtasks.exe Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2852 4380 schtasks.exe Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 3648 4380 schtasks.exe Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 1312 4380 schtasks.exe Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2408 4380 schtasks.exe Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 4692 4380 schtasks.exe Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 3692 4380 schtasks.exe Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 4452 4380 schtasks.exe -
Processes:
resource yara_rule C:\portagentbrowserweb\Containerruntime.exe dcrat behavioral2/memory/1896-13-0x0000000000AB0000-0x0000000000BE2000-memory.dmp dcrat -
Disables Task Manager via registry modification
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Checks computer location settings 2 TTPs 3 IoCs
Looks up country code configured in the registry, likely geofence.
Processes:
nursultan nexgen fix.exeWScript.exeContainerruntime.exedescription ioc process Key value queried \REGISTRY\USER\S-1-5-21-3558294865-3673844354-2255444939-1000\Control Panel\International\Geo\Nation nursultan nexgen fix.exe Key value queried \REGISTRY\USER\S-1-5-21-3558294865-3673844354-2255444939-1000\Control Panel\International\Geo\Nation WScript.exe Key value queried \REGISTRY\USER\S-1-5-21-3558294865-3673844354-2255444939-1000\Control Panel\International\Geo\Nation Containerruntime.exe -
Executes dropped EXE 2 IoCs
Processes:
Containerruntime.exeOfficeClickToRun.exepid process 1896 Containerruntime.exe 4372 OfficeClickToRun.exe -
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
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Drops file in Program Files directory 2 IoCs
Processes:
Containerruntime.exedescription ioc process File created C:\Program Files\Windows Multimedia Platform\fontdrvhost.exe Containerruntime.exe File created C:\Program Files\Windows Multimedia Platform\5b884080fd4f94 Containerruntime.exe -
Drops file in Windows directory 4 IoCs
Processes:
Containerruntime.exedescription ioc process File created C:\Windows\L2Schemas\WmiPrvSE.exe Containerruntime.exe File created C:\Windows\L2Schemas\24dbde2999530e Containerruntime.exe File created C:\Windows\L2Schemas\OfficeClickToRun.exe Containerruntime.exe File created C:\Windows\L2Schemas\e6c9b481da804f Containerruntime.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Creates scheduled task(s) 1 TTPs 18 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
Processes:
schtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exepid process 4588 schtasks.exe 1296 schtasks.exe 3648 schtasks.exe 4452 schtasks.exe 1016 schtasks.exe 4980 schtasks.exe 1312 schtasks.exe 3692 schtasks.exe 3988 schtasks.exe 1632 schtasks.exe 808 schtasks.exe 1180 schtasks.exe 2408 schtasks.exe 2464 schtasks.exe 1548 schtasks.exe 3484 schtasks.exe 2852 schtasks.exe 4692 schtasks.exe -
Modifies registry class 2 IoCs
Processes:
nursultan nexgen fix.exeContainerruntime.exedescription ioc process Key created \REGISTRY\USER\S-1-5-21-3558294865-3673844354-2255444939-1000_Classes\Local Settings nursultan nexgen fix.exe Key created \REGISTRY\USER\S-1-5-21-3558294865-3673844354-2255444939-1000_Classes\Local Settings Containerruntime.exe -
Modifies registry key 1 TTPs 1 IoCs
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Suspicious behavior: EnumeratesProcesses 16 IoCs
Processes:
Containerruntime.exeOfficeClickToRun.exepid process 1896 Containerruntime.exe 1896 Containerruntime.exe 1896 Containerruntime.exe 4372 OfficeClickToRun.exe 4372 OfficeClickToRun.exe 4372 OfficeClickToRun.exe 4372 OfficeClickToRun.exe 4372 OfficeClickToRun.exe 4372 OfficeClickToRun.exe 4372 OfficeClickToRun.exe 4372 OfficeClickToRun.exe 4372 OfficeClickToRun.exe 4372 OfficeClickToRun.exe 4372 OfficeClickToRun.exe 4372 OfficeClickToRun.exe 4372 OfficeClickToRun.exe -
Suspicious behavior: GetForegroundWindowSpam 1 IoCs
Processes:
OfficeClickToRun.exepid process 4372 OfficeClickToRun.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
Containerruntime.exeOfficeClickToRun.exedescription pid process Token: SeDebugPrivilege 1896 Containerruntime.exe Token: SeDebugPrivilege 4372 OfficeClickToRun.exe -
Suspicious use of WriteProcessMemory 17 IoCs
Processes:
nursultan nexgen fix.exeWScript.execmd.exeContainerruntime.execmd.exedescription pid process target process PID 4496 wrote to memory of 3940 4496 nursultan nexgen fix.exe WScript.exe PID 4496 wrote to memory of 3940 4496 nursultan nexgen fix.exe WScript.exe PID 4496 wrote to memory of 3940 4496 nursultan nexgen fix.exe WScript.exe PID 3940 wrote to memory of 4228 3940 WScript.exe cmd.exe PID 3940 wrote to memory of 4228 3940 WScript.exe cmd.exe PID 3940 wrote to memory of 4228 3940 WScript.exe cmd.exe PID 4228 wrote to memory of 1896 4228 cmd.exe Containerruntime.exe PID 4228 wrote to memory of 1896 4228 cmd.exe Containerruntime.exe PID 1896 wrote to memory of 4804 1896 Containerruntime.exe cmd.exe PID 1896 wrote to memory of 4804 1896 Containerruntime.exe cmd.exe PID 4228 wrote to memory of 5000 4228 cmd.exe reg.exe PID 4228 wrote to memory of 5000 4228 cmd.exe reg.exe PID 4228 wrote to memory of 5000 4228 cmd.exe reg.exe PID 4804 wrote to memory of 3516 4804 cmd.exe w32tm.exe PID 4804 wrote to memory of 3516 4804 cmd.exe w32tm.exe PID 4804 wrote to memory of 4372 4804 cmd.exe OfficeClickToRun.exe PID 4804 wrote to memory of 4372 4804 cmd.exe OfficeClickToRun.exe -
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
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C:\Users\Admin\AppData\Local\Temp\nursultan nexgen fix.exe"C:\Users\Admin\AppData\Local\Temp\nursultan nexgen fix.exe"1⤵
- Checks computer location settings
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:4496 -
C:\Windows\SysWOW64\WScript.exe"C:\Windows\System32\WScript.exe" "C:\portagentbrowserweb\WRLLAAz5wgYRSh1EMNi6f5aM.vbe"2⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3940 -
C:\Windows\SysWOW64\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\portagentbrowserweb\6X9rFgrS3wv5iM7PLkmLFP1j.bat" "3⤵
- Suspicious use of WriteProcessMemory
PID:4228 -
C:\portagentbrowserweb\Containerruntime.exe"C:\portagentbrowserweb\Containerruntime.exe"4⤵
- Checks computer location settings
- Executes dropped EXE
- Drops file in Program Files directory
- Drops file in Windows directory
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1896 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\ammqlTbaAs.bat"5⤵
- Suspicious use of WriteProcessMemory
PID:4804 -
C:\Windows\system32\w32tm.exew32tm /stripchart /computer:localhost /period:5 /dataonly /samples:26⤵PID:3516
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C:\Windows\L2Schemas\OfficeClickToRun.exe"C:\Windows\L2Schemas\OfficeClickToRun.exe"6⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
PID:4372 -
C:\Windows\SysWOW64\reg.exereg add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 1 /f4⤵
- Modifies registry key
PID:5000
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "sysmons" /sc MINUTE /mo 10 /tr "'C:\portagentbrowserweb\sysmon.exe'" /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2464
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "sysmon" /sc ONLOGON /tr "'C:\portagentbrowserweb\sysmon.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3988
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "sysmons" /sc MINUTE /mo 5 /tr "'C:\portagentbrowserweb\sysmon.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4588
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "WmiPrvSEW" /sc MINUTE /mo 12 /tr "'C:\portagentbrowserweb\WmiPrvSE.exe'" /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1016
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\portagentbrowserweb\WmiPrvSE.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1548
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "WmiPrvSEW" /sc MINUTE /mo 13 /tr "'C:\portagentbrowserweb\WmiPrvSE.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1632
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "conhostc" /sc MINUTE /mo 5 /tr "'C:\portagentbrowserweb\conhost.exe'" /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4980
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "conhost" /sc ONLOGON /tr "'C:\portagentbrowserweb\conhost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3484
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "conhostc" /sc MINUTE /mo 5 /tr "'C:\portagentbrowserweb\conhost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:808
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 7 /tr "'C:\Windows\L2Schemas\OfficeClickToRun.exe'" /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1296
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\Windows\L2Schemas\OfficeClickToRun.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1180
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 7 /tr "'C:\Windows\L2Schemas\OfficeClickToRun.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2852
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 8 /tr "'C:\Program Files\Windows Multimedia Platform\fontdrvhost.exe'" /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3648
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Program Files\Windows Multimedia Platform\fontdrvhost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1312
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 5 /tr "'C:\Program Files\Windows Multimedia Platform\fontdrvhost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2408
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "WmiPrvSEW" /sc MINUTE /mo 6 /tr "'C:\Windows\L2Schemas\WmiPrvSE.exe'" /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4692
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\Windows\L2Schemas\WmiPrvSE.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3692
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "WmiPrvSEW" /sc MINUTE /mo 13 /tr "'C:\Windows\L2Schemas\WmiPrvSE.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4452
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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C:\Users\Admin\AppData\Local\Temp\ammqlTbaAs.batFilesize
206B
MD5d6e12be0a68cc9ba9af949625965419b
SHA15a1c3115785108de1b840e380ff41b3a4b738234
SHA256b271af173929765f45c47946e36cd19085ad7c0a472f674d988965cf4fb89f03
SHA512c0bfb2c29e5cda415b9a69f45e47797d9a2397752d9e81cf78feaf0abc1ea831ebb5b16944cbe9363fefe21e5d8e6e711d4c823c93f614ff08aa368031d73bca
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C:\portagentbrowserweb\6X9rFgrS3wv5iM7PLkmLFP1j.batFilesize
157B
MD5c8f8a078dace2ff4cb106803c9199643
SHA1a5029ff4c4f0f24b0fbe2951c9a8002501ebd3b5
SHA2561b99d39fa273f33b072c67e0df7d33b1699fa17b7c7139467a658302a5ed0e0d
SHA512efaea3b4653768bbd135a0ec55319df2464f1d440ad982f31a5eff05c5ba5032f4718683ff6419c668bf1f34a117b5a101f56d1efc1d74ad93e692c52686f999
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C:\portagentbrowserweb\Containerruntime.exeFilesize
1.2MB
MD55887a563351ca99247b7e2c448bd9f2e
SHA1b24695e88143863297535989900bb7521ea86d67
SHA256e74cbd74c838db604926e27322342c02f803b95f98680d4089b5c01ed93fb390
SHA512b7d82bd09ba64891b75bbb9356de74a1ed0835709a391698c1301825777418f57e4f2ae3c260d3f7b6ada05d0e7ddeb4a6b75901fdf53bdd82ffa2febb685107
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C:\portagentbrowserweb\WRLLAAz5wgYRSh1EMNi6f5aM.vbeFilesize
220B
MD561a07f2f9e8e9b1f5175b2d60c3e3f18
SHA1e695b0c2b43c786453bf3f6ae504f0626951d281
SHA2565c75708ec9e4fe419a2fd1067bd5793bacb28140177cc6b36300fbf28e7c23d1
SHA5128ef3529f6bf504224e7803019f1e162aead7961bc1a5115f50fb5f580570e8b04707da21a7aab4eb7f1554a3b5333597fb3335e5f6a74dabfdb0583eecb35b5d
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memory/1896-12-0x00007FFCF8AD3000-0x00007FFCF8AD5000-memory.dmpFilesize
8KB
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memory/1896-13-0x0000000000AB0000-0x0000000000BE2000-memory.dmpFilesize
1.2MB
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memory/1896-14-0x00000000013A0000-0x00000000013BC000-memory.dmpFilesize
112KB
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memory/1896-15-0x0000000002D70000-0x0000000002DC0000-memory.dmpFilesize
320KB
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memory/1896-16-0x0000000002D20000-0x0000000002D36000-memory.dmpFilesize
88KB
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memory/1896-17-0x0000000001520000-0x000000000152C000-memory.dmpFilesize
48KB