Analysis
-
max time kernel
271s -
max time network
273s -
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
-
Target
ef3ff3f0.bin.exe
-
Size
94KB
-
MD5
993b73d6490bc5a7e23e02210b317247
-
SHA1
6fd314af34409e945504e166eb8cd88127c1070e
-
SHA256
de04d2402154f676f757cf1380671f396f3fc9f7dbb683d9461edd2718c4e09d
-
SHA512
417f55a066896695ce1b8d998767f706005d3d6f1792f2b86261a235034a6c3bb1deae6920857fbc710d22b833479b2cbeafd92735381f1cc357adcc8a74c55d
Malware Config
Extracted
C:\odt\39FD2-Readme.txt
netwalker
Extracted
C:\Users\Admin\AppData\Roaming\39FD2-Readme.txt
netwalker
Extracted
C:\ProgramData\Microsoft\User Account Pictures\39FD2-Readme.txt
netwalker
Extracted
C:\Program Files\39FD2-Readme.txt
netwalker
Extracted
C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\add-account\images\themes\dark\39FD2-Readme.txt
netwalker
Signatures
-
Detected Netwalker Ransomware 2 IoCs
Detected unpacked Netwalker executable.
Processes:
resource yara_rule behavioral2/memory/4052-3-0x0000000001220000-0x000000000123B000-memory.dmp netwalker_ransomware behavioral2/memory/1796-4-0x0000000002C40000-0x0000000002C5B000-memory.dmp netwalker_ransomware -
Netwalker Ransomware
Ransomware family with multiple versions. Also known as MailTo.
-
Deletes shadow copies 2 TTPs
Ransomware often targets backup files to inhibit system recovery.
-
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\SelectClose.tiff explorer.exe -
Deletes itself 1 IoCs
Processes:
explorer.exepid process 1796 explorer.exe -
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
-
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\39fd2321 = "C:\\Program Files (x86)\\39fd2321\\39fd2321.exe" explorer.exe -
Suspicious use of SetThreadContext 1 IoCs
Processes:
ef3ff3f0.bin.exedescription pid process target process PID 4052 set thread context of 1796 4052 ef3ff3f0.bin.exe explorer.exe -
Drops file in Program Files directory 17165 IoCs
Processes:
explorer.exedescription ioc process File opened for modification C:\Program Files\WindowsApps\microsoft.windowscommunicationsapps_17.7906.42257.0_x64__8wekyb3d8bbwe\images\contrast-black\HxCalendarAppList.scale-150.png explorer.exe File opened for modification C:\Program Files\Java\jdk1.8.0_66\lib\missioncontrol\features\org.eclipse.ecf.filetransfer.httpclient4.ssl.feature_1.0.0.v20140827-1444\feature.properties explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.BingWeather_4.18.56.0_x64__8wekyb3d8bbwe\Assets\Attribution\weather_2_travel.png explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.MicrosoftSolitaireCollection_3.14.1181.0_x64__8wekyb3d8bbwe\Arkadium.Win10.DailyChallenges\Assets\PrizeHistory\3_badges_bronze.png explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.Office.OneNote_17.7668.58071.0_x64__8wekyb3d8bbwe\images\contrast-black\OneNoteNotebookSmallTile.scale-200.png explorer.exe File created C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\walk-through\js\nls\fr-fr\39FD2-Readme.txt explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.Windows.Photos_16.511.8780.0_x64__8wekyb3d8bbwe\Assets\PhotosAppList.contrast-white_targetsize-16.png explorer.exe File opened for modification C:\Program Files\Microsoft Office\root\Licenses16\ExcelR_Trial-pl.xrm-ms explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.WindowsMaps_5.1611.10393.0_neutral_split.scale-100_8wekyb3d8bbwe\Assets\SecondaryTiles\TrafficHub\contrast-black\LargeTile.scale-100.png explorer.exe File opened for modification C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\search-summary\js\nls\nl-nl\ui-strings.js explorer.exe File opened for modification C:\Program Files\Java\jdk1.8.0_66\lib\missioncontrol\plugins\org.eclipse.e4.ui.css.swt.nl_zh_4.4.0.v20140623020002.jar explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.SkypeApp_11.8.204.0_x64__kzf8qxf38zg5c\SkypeApp\Designs\Emoticons\small\bandit.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.Office.OneNote_17.7668.58071.0_x64__8wekyb3d8bbwe\images\contrast-white\OneNotePageLargeTile.scale-125.png explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.WindowsMaps_5.1611.10393.0_x64__8wekyb3d8bbwe\Assets\AppTiles\contrast-white\MapsWideTile.scale-200.png explorer.exe File created C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\uss-search\js\nls\en-gb\39FD2-Readme.txt explorer.exe File opened for modification C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\send-for-sign\js\nls\da-dk\ui-strings.js explorer.exe File opened for modification C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\unified-share\images\themes\dark\Info.png explorer.exe File opened for modification C:\Program Files\WindowsApps\DeletedAllUserPackages\Microsoft.WindowsMaps_5.1611.10393.0_neutral_split.scale-125_8wekyb3d8bbwe\Assets\AppTiles\MapsStoreLogo.scale-125.png explorer.exe File opened for modification C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\ob-preview\js\nls\sk-sk\ui-strings.js explorer.exe File opened for modification C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\walk-through\images\themeless\close.svg explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.SkypeApp_11.8.204.0_x64__kzf8qxf38zg5c\SkypeApp\Designs\Flags\large\bd_60x42.png explorer.exe File opened for modification C:\Program Files\WindowsApps\microsoft.windowscommunicationsapps_17.7906.42257.0_x64__8wekyb3d8bbwe\images\GenericMailBadge.scale-200.png explorer.exe File opened for modification C:\Program Files\Microsoft Office\root\vreg\dcfmui.msi.16.en-us.vreg.dat explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.DesktopAppInstaller_1.0.10252.0_x64__8wekyb3d8bbwe\Assets\AppPackageBadgeLogo.scale-200.png explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.BingWeather_4.18.56.0_x64__8wekyb3d8bbwe\Assets\AppTiles\WeatherImages\423x173\75.jpg explorer.exe File opened for modification C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\fss\img\tools\@1x\[email protected] explorer.exe File opened for modification C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\tracked-send\images\illustrations.png explorer.exe File opened for modification C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\images\s_listview_selected.svg explorer.exe File opened for modification C:\Program Files\WindowsApps\DeletedAllUserPackages\Microsoft.WindowsMaps_5.1611.10393.0_neutral_split.scale-125_8wekyb3d8bbwe\Assets\AppTiles\contrast-black\MapsAppList.scale-125.png explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.MicrosoftSolitaireCollection_3.14.1181.0_x64__8wekyb3d8bbwe\Arkadium.Win10.StarClub\Assets\Sounds\StarUnlock_D.wav explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.WindowsMaps_5.1611.10393.0_neutral_split.scale-100_8wekyb3d8bbwe\Assets\SecondaryTiles\Directions\Car\LTR\MedTile.scale-100.png explorer.exe File opened for modification C:\Program Files\Java\jdk1.8.0_66\lib\visualvm\platform\config\Modules\org-netbeans-modules-sendopts.xml explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.MicrosoftStickyNotes_1.4.101.0_neutral_split.scale-125_8wekyb3d8bbwe\AppxBlockMap.xml explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.SkypeApp_11.8.204.0_x64__kzf8qxf38zg5c\SkypeApp\Designs\Flags\small\hr_16x11.png explorer.exe File opened for modification C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\tracked-send\js\viewer\nls\fi-fi\ui-strings.js explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.MicrosoftStickyNotes_1.4.101.0_neutral_~_8wekyb3d8bbwe\AppxSignature.p7x explorer.exe File opened for modification C:\Program Files\Microsoft Office\root\Licenses16\O365HomePremR_SubTrial3-ppd.xrm-ms explorer.exe File created C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\desktop-connector-files-select\js\39FD2-Readme.txt explorer.exe File opened for modification C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\uss-search\js\nls\pt-br\ui-strings.js explorer.exe File opened for modification C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\on-boarding\js\nls\cs-cz\ui-strings.js explorer.exe File opened for modification C:\Program Files\Java\jdk1.8.0_66\lib\missioncontrol\plugins\com.jrockit.mc.console.ui.notification_5.5.0.165303\html\olh001.htm explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.Windows.Photos_16.511.8780.0_x64__8wekyb3d8bbwe\Lumia.VideoTk\PassthroughPS_BGRA.cso explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.WindowsAlarms_10.1702.333.0_x64__8wekyb3d8bbwe\Assets\AlarmsAppList.contrast-white_targetsize-96.png explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.WindowsCalculator_10.1702.312.0_x64__8wekyb3d8bbwe\Assets\CalculatorAppList.targetsize-30.png explorer.exe File opened for modification C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\on-boarding\images\themeless\MobileAcrobatCard_Dark.pdf explorer.exe File opened for modification C:\Program Files\Java\jdk1.8.0_66\lib\missioncontrol\plugins\com.jrockit.mc.rcp.application.ja_5.5.0.165303.jar explorer.exe File opened for modification C:\Program Files\Java\jdk1.8.0_66\lib\missioncontrol\features\org.eclipse.equinox.p2.core.feature_1.3.0.v20140523-0116\META-INF\ECLIPSE_.RSA explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.SkypeApp_11.8.204.0_x64__kzf8qxf38zg5c\SkypeApp\Assets\Audio\incoming_im.wav explorer.exe File opened for modification C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\activity-badge\js\nls\nb-no\ui-strings.js explorer.exe File opened for modification C:\Program Files\Microsoft Office\root\Document Themes 16\Theme Fonts\Georgia.xml explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.MicrosoftSolitaireCollection_3.14.1181.0_x64__8wekyb3d8bbwe\SharpDXEngine\Rendering\Shaders\Builtin\HLSL\ConstantsPerLightData.fx explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.Office.OneNote_17.7668.58071.0_x64__8wekyb3d8bbwe\images\OneNoteSectionLargeTile.scale-200.png explorer.exe File opened for modification C:\Program Files\Microsoft Office\PackageManifests\AppXManifest.90160000-0016-0409-1000-0000000FF1CE.xml explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.MicrosoftSolitaireCollection_3.14.1181.0_x64__8wekyb3d8bbwe\Avatars.winmd explorer.exe File opened for modification C:\Program Files (x86)\Common Files\Adobe\Reader\DC\Linguistics\Providers\Plugins2\AdobeHunspellPlugin\SupplementalDictionaries\en_US\Excluded.txt explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.SkypeApp_11.8.204.0_x64__kzf8qxf38zg5c\SkypeApp\Designs\Emoticons\small\mooning.png explorer.exe File opened for modification C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\pages-app\js\nls\da-dk\ui-strings.js explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.Windows.Photos_16.511.8780.0_x64__8wekyb3d8bbwe\Lumia.ViewerPlugin\CinemagraphDelegate\CinemagraphControl.xaml explorer.exe File opened for modification C:\Program Files\WindowsApps\microsoft.windowscommunicationsapps_17.7906.42257.0_x64__8wekyb3d8bbwe\images\contrast-white\GenericMailLargeTile.scale-400.png explorer.exe File opened for modification C:\Program Files\Java\jdk1.8.0_66\lib\missioncontrol\plugins\org.eclipse.equinox.p2.director.app.nl_zh_4.4.0.v20140623020002.jar explorer.exe File opened for modification C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\css\main-cef.css explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.Office.OneNote_17.7668.58071.0_x64__8wekyb3d8bbwe\images\326_32x32x32.png explorer.exe File opened for modification C:\Program Files\WindowsApps\Microsoft.XboxApp_25.25.13009.0_x64__8wekyb3d8bbwe\Assets\GamesXboxHubAppList.targetsize-256_altform-unplated.png explorer.exe -
Interacts with shadow copies 2 TTPs 2 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
Processes:
vssadmin.exevssadmin.exepid process 2884 vssadmin.exe 6064 vssadmin.exe -
Suspicious behavior: EnumeratesProcesses 16701 IoCs
Processes:
explorer.exeexplorer.exepid process 1796 explorer.exe 1796 explorer.exe 1796 explorer.exe 1796 explorer.exe 1796 explorer.exe 1796 explorer.exe 1796 explorer.exe 1796 explorer.exe 1796 explorer.exe 1796 explorer.exe 1796 explorer.exe 1796 explorer.exe 1796 explorer.exe 1796 explorer.exe 1796 explorer.exe 1796 explorer.exe 1796 explorer.exe 1796 explorer.exe 1796 explorer.exe 1796 explorer.exe 1796 explorer.exe 1796 explorer.exe 1796 explorer.exe 1796 explorer.exe 1796 explorer.exe 1796 explorer.exe 1796 explorer.exe 4032 explorer.exe 4032 explorer.exe 4032 explorer.exe 4032 explorer.exe 4032 explorer.exe 4032 explorer.exe 4032 explorer.exe 4032 explorer.exe 4032 explorer.exe 4032 explorer.exe 4032 explorer.exe 4032 explorer.exe 4032 explorer.exe 4032 explorer.exe 4032 explorer.exe 4032 explorer.exe 4032 explorer.exe 4032 explorer.exe 4032 explorer.exe 4032 explorer.exe 4032 explorer.exe 4032 explorer.exe 4032 explorer.exe 4032 explorer.exe 4032 explorer.exe 4032 explorer.exe 4032 explorer.exe 4032 explorer.exe 4032 explorer.exe 4032 explorer.exe 4032 explorer.exe 4032 explorer.exe 4032 explorer.exe 4032 explorer.exe 4032 explorer.exe 4032 explorer.exe 4032 explorer.exe -
Suspicious behavior: MapViewOfSection 2 IoCs
Processes:
ef3ff3f0.bin.exeexplorer.exepid process 4052 ef3ff3f0.bin.exe 1796 explorer.exe -
Suspicious use of AdjustPrivilegeToken 6 IoCs
Processes:
explorer.exevssvc.exeexplorer.exedescription pid process Token: SeDebugPrivilege 4032 explorer.exe Token: SeBackupPrivilege 2592 vssvc.exe Token: SeRestorePrivilege 2592 vssvc.exe Token: SeAuditPrivilege 2592 vssvc.exe Token: SeDebugPrivilege 1796 explorer.exe Token: SeImpersonatePrivilege 1796 explorer.exe -
Suspicious use of WriteProcessMemory 13 IoCs
Processes:
ef3ff3f0.bin.exeexplorer.exeexplorer.exedescription pid process target process PID 4052 wrote to memory of 1796 4052 ef3ff3f0.bin.exe explorer.exe PID 4052 wrote to memory of 1796 4052 ef3ff3f0.bin.exe explorer.exe PID 4052 wrote to memory of 1796 4052 ef3ff3f0.bin.exe explorer.exe PID 1796 wrote to memory of 4032 1796 explorer.exe explorer.exe PID 1796 wrote to memory of 4032 1796 explorer.exe explorer.exe PID 1796 wrote to memory of 4032 1796 explorer.exe explorer.exe PID 4032 wrote to memory of 2884 4032 explorer.exe vssadmin.exe PID 4032 wrote to memory of 2884 4032 explorer.exe vssadmin.exe PID 1796 wrote to memory of 10124 1796 explorer.exe notepad.exe PID 1796 wrote to memory of 10124 1796 explorer.exe notepad.exe PID 1796 wrote to memory of 10124 1796 explorer.exe notepad.exe PID 1796 wrote to memory of 6064 1796 explorer.exe vssadmin.exe PID 1796 wrote to memory of 6064 1796 explorer.exe vssadmin.exe
Processes
-
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
PID:4052 -
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
PID:1796 -
C:\Windows\SysWOW64\explorer.exe"C:\Windows\system32\explorer.exe"3⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4032 -
C:\Windows\system32\vssadmin.exeC:\Windows\system32\vssadmin.exe delete shadows /all /quiet4⤵
- Interacts with shadow copies
PID:2884
-
-
-
C:\Windows\SysWOW64\notepad.exeC:\Windows\system32\notepad.exe "C:\Users\Admin\Desktop\39FD2-Readme.txt"3⤵PID:10124
-
-
C:\Windows\system32\vssadmin.exeC:\Windows\system32\vssadmin.exe delete shadows /all /quiet3⤵
- Interacts with shadow copies
PID:6064
-
-
-
C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2592
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
Loading Replay Monitor...
Downloads
-
MD5
4dd91e87e753e49b801bd909a8a43452
SHA18019097882e8c42697a7ee2b3283617ab2367876
SHA2560cfe75eb4afb41ed71b3bf16b882914050e73bfaa5fcd3a4680970b9f15e65da
SHA512bbe213d82910aacbdf9811af7d8f9d38459fcb1852675cf8d8176f51385cbbc45feaf62658256bbb08cfd1530ab45b7f4a0d94b27eb48613b77f18451325894d