Analysis
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max time kernel
36s -
max time network
49s -
platform
windows10_x64 -
resource
win10v20201028 -
submitted
03-12-2020 18:27
Static task
static1
Behavioral task
behavioral1
Sample
ef3ff3f0.bin.exe
Resource
win10v20201028
Behavioral task
behavioral2
Sample
ef3ff3f0.bin.exe
Resource
win10v20201028
Behavioral task
behavioral3
Sample
ef3ff3f0.bin.exe
Resource
win10v20201028
General
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Target
ef3ff3f0.bin.exe
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Size
94KB
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MD5
993b73d6490bc5a7e23e02210b317247
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SHA1
6fd314af34409e945504e166eb8cd88127c1070e
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SHA256
de04d2402154f676f757cf1380671f396f3fc9f7dbb683d9461edd2718c4e09d
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SHA512
417f55a066896695ce1b8d998767f706005d3d6f1792f2b86261a235034a6c3bb1deae6920857fbc710d22b833479b2cbeafd92735381f1cc357adcc8a74c55d
Malware Config
Extracted
C:\6C16D-Readme.txt
netwalker
knoocknoo@cock.li
eeeooppaaaxxx@tuta.io
Extracted
C:\ProgramData\Microsoft\Network\Downloader\6C16D-Readme.txt
netwalker
knoocknoo@cock.li
eeeooppaaaxxx@tuta.io
Signatures
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Detected Netwalker Ransomware 2 IoCs
Detected unpacked Netwalker executable.
Processes:
resource yara_rule behavioral3/memory/4760-3-0x00000000005E0000-0x00000000005FB000-memory.dmp netwalker_ransomware behavioral3/memory/4172-4-0x00000000029D0000-0x00000000029EB000-memory.dmp netwalker_ransomware -
Netwalker Ransomware
Ransomware family with multiple versions. Also known as MailTo.
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Deletes shadow copies 2 TTPs
Ransomware often targets backup files to inhibit system recovery.
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Modifies extensions of user files 1 IoCs
Ransomware generally changes the extension on encrypted files.
Processes:
explorer.exedescription ioc process File opened for modification C:\Users\Admin\Pictures\EnterApprove.tiff explorer.exe -
Deletes itself 1 IoCs
Processes:
explorer.exepid process 4172 explorer.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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Adds Run key to start application 2 TTPs 1 IoCs
Processes:
explorer.exedescription ioc process Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\6c16d51e = "C:\\Program Files (x86)\\6c16d51e\\6c16d51e.exe" explorer.exe -
Suspicious use of SetThreadContext 1 IoCs
Processes:
ef3ff3f0.bin.exedescription pid process target process PID 4760 set thread context of 4172 4760 ef3ff3f0.bin.exe explorer.exe -
Drops file in Program Files directory 2842 IoCs
Processes:
explorer.exedescription ioc process File opened for modification C:\Program Files\WindowsApps\microsoft.windowscommunicationsapps_17.7906.42257.0_x64__8wekyb3d8bbwe\images\HxCalendarAppList.scale-150.png explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.Office.OneNote_17.7668.58071.0_x64__8wekyb3d8bbwe\AppxManifest.xml explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.Windows.Photos_16.511.8780.0_x64__8wekyb3d8bbwe\Assets\PhotosAppList.targetsize-48.png explorer.exe File opened for modification C:\Program Files\WindowsApps\microsoft.windowscommunicationsapps_17.7906.42257.0_x64__8wekyb3d8bbwe\images\6449_32x32x32.png explorer.exe File opened for modification C:\Program Files\WindowsApps\microsoft.windowscommunicationsapps_17.7906.42257.0_x64__8wekyb3d8bbwe\images\6478_32x32x32.png explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.3DBuilder_13.0.10349.0_neutral_split.scale-140_8wekyb3d8bbwe\Assets\Office\ResetCoord.scale-140.png explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.Messaging_3.26.24002.0_x64__8wekyb3d8bbwe\AppxBlockMap.xml explorer.exe File opened for modification C:\Program Files\WindowsApps\DeletedAllUserPackages\Microsoft.ZuneVideo_10.16112.11601.0_neutral_resources.scale-125_8wekyb3d8bbwe\Assets\contrast-black\Logo.scale-125_contrast-black.png explorer.exe File opened for modification C:\Program Files\WindowsApps\DeletedAllUserPackages\Microsoft.ZuneVideo_10.16112.11601.0_neutral_resources.scale-125_8wekyb3d8bbwe\Assets\contrast-black\Movie-TVStoreLogo.scale-125_contrast-black.png explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.XboxApp_25.25.13009.0_x64__8wekyb3d8bbwe\_Resources\8.rsrc explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.WindowsMaps_5.1611.10393.0_neutral_split.scale-100_8wekyb3d8bbwe\AppxBlockMap.xml explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.XboxApp_25.25.13009.0_x64__8wekyb3d8bbwe\Assets\GamesXboxHubAppList.targetsize-20_altform-unplated_contrast-white.png explorer.exe File opened for modification C:\Program Files\WindowsApps\microsoft.windowscommunicationsapps_17.7906.42257.0_x64__8wekyb3d8bbwe\images\5941_32x32x32.png explorer.exe File opened for modification C:\Program Files\WindowsApps\microsoft.windowscommunicationsapps_17.7906.42257.0_x64__8wekyb3d8bbwe\images\HxA-GoogleCloudCache-Dark.scale-140.png explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.WindowsFeedbackHub_1.1612.10312.0_x64__8wekyb3d8bbwe\Assets\InsiderHubWideTile.scale-200_contrast-black.png explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.WindowsCalculator_10.1702.312.0_x64__8wekyb3d8bbwe\Assets\CalculatorAppList.contrast-black_targetsize-32.png explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.WindowsSoundRecorder_10.1702.301.0_x64__8wekyb3d8bbwe\Assets\VoiceRecorderAppList.contrast-black_targetsize-36.png explorer.exe File opened for modification C:\Program Files\WindowsApps\DeletedAllUserPackages\Microsoft.ZuneMusic_10.16112.11621.0_neutral_resources.scale-200_8wekyb3d8bbwe\Assets\contrast-black\AppList.scale-200_contrast-black.png explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.DesktopAppInstaller_1.0.10252.0_neutral_split.scale-125_8wekyb3d8bbwe\Assets\contrast-black\AppPackageLargeTile.scale-125_contrast-black.png explorer.exe File opened for modification C:\Program Files\WindowsApps\microsoft.windowscommunicationsapps_17.7906.42257.0_x64__8wekyb3d8bbwe\models\es-ES.PhoneNumber.ot explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.Windows.Photos_16.511.8780.0_x64__8wekyb3d8bbwe\Assets\PhotosAppList.targetsize-16_altform-colorize.png explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.XboxApp_25.25.13009.0_x64__8wekyb3d8bbwe\_Resources\5.rsrc explorer.exe File opened for modification C:\Program Files\WindowsApps\DeletedAllUserPackages\Microsoft.ZuneVideo_10.16112.11601.0_neutral_resources.scale-200_8wekyb3d8bbwe\Assets\Movie-TVStoreLogo.scale-200.png explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.SkypeApp_11.8.204.0_x64__kzf8qxf38zg5c\Microsoft.Skype.ImageTool.winmd explorer.exe File opened for modification C:\Program Files\WindowsApps\DeletedAllUserPackages\Microsoft.ZuneVideo_10.16112.11601.0_neutral_resources.scale-200_8wekyb3d8bbwe\AppxManifest.xml explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.WindowsAlarms_10.1702.333.0_x64__8wekyb3d8bbwe\Assets\AlarmsAppList.contrast-black_targetsize-80.png explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.WindowsAlarms_10.1702.333.0_x64__8wekyb3d8bbwe\Assets\AlarmsAppList.contrast-white_scale-200.png explorer.exe File opened for modification C:\Program Files\WindowsApps\DeletedAllUserPackages\Microsoft.WindowsAlarms_10.1702.333.0_neutral_split.scale-125_8wekyb3d8bbwe\resources.pri explorer.exe File opened for modification C:\Program Files\WindowsApps\microsoft.windowscommunicationsapps_17.7906.42257.0_x64__8wekyb3d8bbwe\images\7260_20x20x32.png explorer.exe File opened for modification C:\Program Files\WindowsApps\DeletedAllUserPackages\Microsoft.WindowsSoundRecorder_10.1702.301.0_neutral_split.scale-200_8wekyb3d8bbwe\Assets\VoiceRecorderLargeTile.contrast-white_scale-200.png explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.Windows.Photos_16.511.8780.0_x64__8wekyb3d8bbwe\Lumia.VideoTk\AlphaBlendingEffectPS_UV.cso explorer.exe File opened for modification C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\UIThemes\DarkTheme.acrotheme explorer.exe File opened for modification C:\Program Files\WindowsApps\microsoft.windowscommunicationsapps_17.7906.42257.0_x64__8wekyb3d8bbwe\images\HxCalendarAppList.targetsize-20.png explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.WindowsAlarms_10.1702.333.0_neutral_split.scale-100_8wekyb3d8bbwe\Assets\WorldClockLargeTile.contrast-black_scale-100.png explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.MicrosoftStickyNotes_1.4.101.0_x64__8wekyb3d8bbwe\Microsoft.Input.Ink.Analysis.winmd explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.OneConnect_2.1701.277.0_neutral_split.scale-100_8wekyb3d8bbwe\Assets\OneConnectWideTile.scale-100.png explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.Windows.Photos_16.511.8780.0_x64__8wekyb3d8bbwe\Lumia.ViewerPlugin\Assets\IconOpenInCinemagraph.scale-200.png explorer.exe File opened for modification C:\Program Files\WindowsApps\DeletedAllUserPackages\Microsoft.XboxApp_25.25.13009.0_neutral_split.scale-125_8wekyb3d8bbwe\Assets\GamesXboxHubSmallTile.scale-125_contrast-high.png explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.MicrosoftOfficeHub_17.8010.5926.0_x64__8wekyb3d8bbwe\XMLOffKeys\Keys_OffVer365.xml explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.WindowsMaps_5.1611.10393.0_x64__8wekyb3d8bbwe\microsoft.system.package.metadata\resources.d3ad3041.pri explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.Getstarted_4.5.6.0_neutral_split.scale-200_8wekyb3d8bbwe\Assets\GetStartedMedTile.scale-200_contrast-white.png explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.OneConnect_2.1701.277.0_neutral_split.scale-100_8wekyb3d8bbwe\Assets\contrast-white\OneConnectLargeTile.scale-100.png explorer.exe File opened for modification C:\Program Files\WindowsApps\microsoft.windowscommunicationsapps_17.7906.42257.0_x64__8wekyb3d8bbwe\images\6365_36x36x32.png explorer.exe File opened for modification C:\Program Files\WindowsApps\DeletedAllUserPackages\Microsoft.XboxApp_25.25.13009.0_neutral_split.scale-125_8wekyb3d8bbwe\resources.pri explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.MicrosoftSolitaireCollection_3.14.1181.0_x64__8wekyb3d8bbwe\Arkadium.Win10.DailyChallenges\Assets\badge-animation_2.png explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.Windows.Photos_16.511.8780.0_x64__8wekyb3d8bbwe\Assets\PhotosAppList.targetsize-256.png explorer.exe File opened for modification C:\Program Files\WindowsApps\DeletedAllUserPackages\Microsoft.WindowsAlarms_10.1702.333.0_neutral_split.scale-125_8wekyb3d8bbwe\Assets\StopwatchWideTile.contrast-white_scale-125.png explorer.exe File opened for modification C:\Program Files\WindowsApps\microsoft.windowscommunicationsapps_17.7906.42257.0_x64__8wekyb3d8bbwe\images\6440_48x48x32.png explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.WindowsCalculator_10.1702.312.0_x64__8wekyb3d8bbwe\Assets\CalculatorMedTile.scale-200.png explorer.exe File opened for modification C:\Program Files\7-Zip\7-zip.chm explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.Getstarted_4.5.6.0_neutral_split.scale-200_8wekyb3d8bbwe\AppxBlockMap.xml explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.WindowsCalculator_10.1702.312.0_x64__8wekyb3d8bbwe\Assets\CalculatorAppList.contrast-white_targetsize-36.png explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.MicrosoftOfficeHub_17.8010.5926.0_x64__8wekyb3d8bbwe\XMLOffKeys\Keys_OffVer16.xml explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.Office.OneNote_17.7668.58071.0_x64__8wekyb3d8bbwe\images\3899_48x48x32.png explorer.exe File opened for modification C:\Program Files\7-Zip\Lang\ca.txt explorer.exe File opened for modification C:\Program Files\WindowsApps\microsoft.windowscommunicationsapps_17.7906.42257.0_x64__8wekyb3d8bbwe\models\appuri.model explorer.exe File opened for modification C:\Program Files\WindowsApps\microsoft.windowscommunicationsapps_17.7906.42257.0_x64__8wekyb3d8bbwe\models\mail.config explorer.exe File opened for modification C:\Program Files\WindowsApps\DeletedAllUserPackages\Microsoft.XboxApp_25.25.13009.0_neutral_split.scale-125_8wekyb3d8bbwe\Assets\GamesXboxHubSplashScreen.scale-125_contrast-white.png explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.SkypeApp_11.8.204.0_x64__kzf8qxf38zg5c\SkypeApp\Assets\LockScreenBadgeLogo.scale-200.png explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.WindowsAlarms_10.1702.333.0_x64__8wekyb3d8bbwe\Assets\AlarmsAppList.scale-200.png explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.WindowsStore_11701.1001.87.0_x64__8wekyb3d8bbwe\WinStoreTasks.winmd explorer.exe File opened for modification C:\Program Files\WindowsApps\DeletedAllUserPackages\Microsoft.XboxApp_25.25.13009.0_neutral_split.scale-125_8wekyb3d8bbwe\Assets\GamesXboxHubStoreLogo.scale-125.png explorer.exe File opened for modification C:\Program Files\WindowsApps\microsoft.windowscommunicationsapps_17.7906.42257.0_x64__8wekyb3d8bbwe\images\6584_24x24x32.png explorer.exe File opened for modification C:\Program Files\WindowsApps\microsoft.windowscommunicationsapps_17.7906.42257.0_x64__8wekyb3d8bbwe\images\5311_24x24x32.png explorer.exe -
Interacts with shadow copies 2 TTPs 1 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
Processes:
vssadmin.exepid process 4272 vssadmin.exe -
Suspicious behavior: EnumeratesProcesses 7153 IoCs
Processes:
explorer.exeexplorer.exepid process 4172 explorer.exe 4172 explorer.exe 4172 explorer.exe 4172 explorer.exe 4172 explorer.exe 4172 explorer.exe 4172 explorer.exe 4172 explorer.exe 4172 explorer.exe 4172 explorer.exe 4172 explorer.exe 4172 explorer.exe 4172 explorer.exe 4172 explorer.exe 4172 explorer.exe 4172 explorer.exe 4172 explorer.exe 4172 explorer.exe 4172 explorer.exe 4172 explorer.exe 4172 explorer.exe 4172 explorer.exe 4172 explorer.exe 4172 explorer.exe 4172 explorer.exe 4172 explorer.exe 4172 explorer.exe 3724 explorer.exe 3724 explorer.exe 3724 explorer.exe 3724 explorer.exe 3724 explorer.exe 3724 explorer.exe 3724 explorer.exe 3724 explorer.exe 3724 explorer.exe 3724 explorer.exe 3724 explorer.exe 3724 explorer.exe 3724 explorer.exe 3724 explorer.exe 3724 explorer.exe 3724 explorer.exe 3724 explorer.exe 3724 explorer.exe 3724 explorer.exe 3724 explorer.exe 3724 explorer.exe 3724 explorer.exe 3724 explorer.exe 3724 explorer.exe 3724 explorer.exe 3724 explorer.exe 3724 explorer.exe 3724 explorer.exe 3724 explorer.exe 3724 explorer.exe 3724 explorer.exe 3724 explorer.exe 3724 explorer.exe 3724 explorer.exe 3724 explorer.exe 3724 explorer.exe 3724 explorer.exe -
Suspicious behavior: MapViewOfSection 2 IoCs
Processes:
ef3ff3f0.bin.exeexplorer.exepid process 4760 ef3ff3f0.bin.exe 4172 explorer.exe -
Suspicious use of AdjustPrivilegeToken 6 IoCs
Processes:
explorer.exevssvc.exeexplorer.exedescription pid process Token: SeDebugPrivilege 3724 explorer.exe Token: SeBackupPrivilege 2480 vssvc.exe Token: SeRestorePrivilege 2480 vssvc.exe Token: SeAuditPrivilege 2480 vssvc.exe Token: SeDebugPrivilege 4172 explorer.exe Token: SeImpersonatePrivilege 4172 explorer.exe -
Suspicious use of WriteProcessMemory 8 IoCs
Processes:
ef3ff3f0.bin.exeexplorer.exeexplorer.exedescription pid process target process PID 4760 wrote to memory of 4172 4760 ef3ff3f0.bin.exe explorer.exe PID 4760 wrote to memory of 4172 4760 ef3ff3f0.bin.exe explorer.exe PID 4760 wrote to memory of 4172 4760 ef3ff3f0.bin.exe explorer.exe PID 4172 wrote to memory of 3724 4172 explorer.exe explorer.exe PID 4172 wrote to memory of 3724 4172 explorer.exe explorer.exe PID 4172 wrote to memory of 3724 4172 explorer.exe explorer.exe PID 3724 wrote to memory of 4272 3724 explorer.exe vssadmin.exe PID 3724 wrote to memory of 4272 3724 explorer.exe vssadmin.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\ef3ff3f0.bin.exe"C:\Users\Admin\AppData\Local\Temp\ef3ff3f0.bin.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\explorer.exe"C:\Windows\system32\explorer.exe"2⤵
- Modifies extensions of user files
- Deletes itself
- Adds Run key to start application
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\explorer.exe"C:\Windows\system32\explorer.exe"3⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\vssadmin.exeC:\Windows\system32\vssadmin.exe delete shadows /all /quiet4⤵
- Interacts with shadow copies
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Matrix ATT&CK v6
Replay Monitor
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Downloads
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memory/3724-5-0x0000000000000000-mapping.dmp
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memory/4172-2-0x0000000000000000-mapping.dmp
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memory/4172-4-0x00000000029D0000-0x00000000029EB000-memory.dmpFilesize
108KB
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memory/4272-6-0x0000000000000000-mapping.dmp
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memory/4760-3-0x00000000005E0000-0x00000000005FB000-memory.dmpFilesize
108KB