Analysis
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max time kernel
116s -
max time network
120s -
platform
windows10_x64 -
resource
win10v20210408 -
submitted
04-10-2021 16:51
Static task
static1
Behavioral task
behavioral1
Sample
ATOMSILO_2.exe
Resource
win7-en-20210920
Behavioral task
behavioral2
Sample
ATOMSILO_2.exe
Resource
win10v20210408
General
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Target
ATOMSILO_2.exe
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Size
328KB
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MD5
04a8307259478245cbae49940b6d655a
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SHA1
0f5259812be378bbd764cef94697019075990b4d
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SHA256
d9f7bb98ad01c4775ec71ec66f5546de131735e6dba8122474cc6eb62320e47b
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SHA512
a2277ba16e1749ea7528f38640b2e2ca6d3aeb3c86df0bc417df37416fa6bc9be3bc84889e73793f8cda965676c2b0976bab140be2246dce7ab4ea6451d2e0f3
Malware Config
Extracted
C:\Users\Public\ATOMSILO-README.hta
atomsilo
Email:[email protected]
http://mhdehvkomeabau7gsetnsrhkfign4jgnx3wajth5yb5h6kvzbd72wlqd.onion
Signatures
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AtomSilo
Ransomware family first seen in September 2021.
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Modifies extensions of user files 4 IoCs
Ransomware generally changes the extension on encrypted files.
Processes:
ATOMSILO_2.exedescription ioc process File renamed C:\Users\Admin\Pictures\RevokeTest.crw => \??\c:\Users\Admin\Pictures\RevokeTest.crw.ATOMSILO ATOMSILO_2.exe File renamed C:\Users\Admin\Pictures\SyncBlock.tif => \??\c:\Users\Admin\Pictures\SyncBlock.tif.ATOMSILO ATOMSILO_2.exe File renamed C:\Users\Admin\Pictures\MergeSplit.tif => \??\c:\Users\Admin\Pictures\MergeSplit.tif.ATOMSILO ATOMSILO_2.exe File renamed C:\Users\Admin\Pictures\ReceiveRename.raw => \??\c:\Users\Admin\Pictures\ReceiveRename.raw.ATOMSILO ATOMSILO_2.exe -
Drops startup file 1 IoCs
Processes:
ATOMSILO_2.exedescription ioc process File created \??\c:\Users\Admin\AppData\Roaming\Microsoft\Word\STARTUP\README-FILE-GFBFPSXA-1633373518.hta ATOMSILO_2.exe -
Drops file in Program Files directory 64 IoCs
Processes:
ATOMSILO_2.exedescription ioc process File opened for modification \??\c:\Program Files\Microsoft Office\root\Office16\wordEtw.man ATOMSILO_2.exe File opened for modification \??\c:\Program Files\WindowsApps\DeletedAllUserPackages\Microsoft.ZuneMusic_10.16112.11621.0_neutral_resources.scale-200_8wekyb3d8bbwe\Assets\contrast-black\LargeLogo.scale-200_contrast-black.png ATOMSILO_2.exe File opened for modification \??\c:\Program Files\WindowsApps\Microsoft.WindowsCamera_2017.125.40.0_x64__8wekyb3d8bbwe\Assets\WindowsIcons\WindowsCameraAppList.targetsize-36_altform-unplated.png ATOMSILO_2.exe File created \??\c:\Program Files\Java\jdk1.8.0_66\jre\bin\README-FILE-GFBFPSXA-1633373518.hta ATOMSILO_2.exe File opened for modification \??\c:\Program Files\Microsoft Office\root\Licenses16\VisioProXC2RVL_KMS_ClientC2R-ul.xrm-ms ATOMSILO_2.exe File opened for modification \??\c:\Program Files\WindowsApps\DeletedAllUserPackages\Microsoft.WindowsCamera_2017.125.40.0_neutral_split.scale-125_8wekyb3d8bbwe\Assets\WindowsIcons\WindowsCameraMedTile.contrast-white_scale-125.png ATOMSILO_2.exe File opened for modification \??\c:\Program Files\WindowsApps\Microsoft.SkypeApp_11.8.204.0_x64__kzf8qxf38zg5c\SkypeApp\Designs\Flags\small\lr_16x11.png ATOMSILO_2.exe File created \??\c:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\app\dev\nls\eu-es\README-FILE-GFBFPSXA-1633373518.hta ATOMSILO_2.exe File opened for modification \??\c:\Program Files\Common Files\microsoft shared\ink\fsdefinitions\symbols.xml ATOMSILO_2.exe File opened for modification \??\c:\Program Files\Java\jdk1.8.0_66\jre\lib\tzmappings ATOMSILO_2.exe File opened for modification \??\c:\Program Files\Java\jdk1.8.0_66\lib\missioncontrol\features\org.eclipse.emf.common_2.10.1.v20140901-1043\feature.xml ATOMSILO_2.exe File opened for modification \??\c:\Program Files\Java\jre1.8.0_66\lib\ext\jfxrt.jar ATOMSILO_2.exe File opened for modification \??\c:\Program Files\WindowsApps\DeletedAllUserPackages\Microsoft.WindowsStore_11701.1001.87.0_neutral_split.scale-125_8wekyb3d8bbwe\AppxSignature.p7x ATOMSILO_2.exe File opened for modification \??\c:\Program Files\WindowsApps\Microsoft.MicrosoftSolitaireCollection_3.14.1181.0_x64__8wekyb3d8bbwe\Assets\MainPageState2\see_all_bp_920.jpg ATOMSILO_2.exe File opened for modification \??\c:\Program Files (x86)\Adobe\Acrobat Reader DC\Resource\TypeSupport\Unicode\Mappings\Mac\CYRILLIC.TXT ATOMSILO_2.exe File opened for modification \??\c:\Program Files\WindowsApps\Microsoft.ZuneMusic_10.16112.11621.0_x64__8wekyb3d8bbwe\Assets\UpsellContentDialogHeader.jpg ATOMSILO_2.exe File opened for modification \??\c:\Program Files\WindowsApps\Microsoft.ZuneVideo_10.16112.11601.0_x64__8wekyb3d8bbwe\Assets\contrast-black\AppList.targetsize-30_altform-unplated_contrast-black.png ATOMSILO_2.exe File opened for modification \??\c:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\exportpdfupsell-app\js\nls\uk-ua\ui-strings.js ATOMSILO_2.exe File opened for modification \??\c:\Program Files\WindowsApps\Microsoft.SkypeApp_11.8.204.0_x64__kzf8qxf38zg5c\SkypeApp\Designs\Flags\large\mx_60x42.png ATOMSILO_2.exe File opened for modification \??\c:\Program Files\WindowsApps\Microsoft.WindowsMaps_5.1611.10393.0_neutral_split.scale-100_8wekyb3d8bbwe\Assets\SecondaryTiles\Home\MedTile.scale-100.png ATOMSILO_2.exe File created \??\c:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\app\dev\nls\ru-ru\README-FILE-GFBFPSXA-1633373518.hta ATOMSILO_2.exe File opened for modification \??\c:\Program Files\Microsoft Office\root\Integration\C2RManifest.wordmui.msi.16.en-us.xml ATOMSILO_2.exe File opened for modification \??\c:\Program Files\Microsoft Office\root\rsod\osmux.x-none.msi.16.x-none.tree.dat ATOMSILO_2.exe File opened for modification \??\c:\Program Files\WindowsApps\Microsoft.Getstarted_4.5.6.0_x64__8wekyb3d8bbwe\Resources\TopicPage\core.js ATOMSILO_2.exe File opened for modification \??\c:\Program Files\WindowsApps\Microsoft.OneConnect_2.1701.277.0_x64__8wekyb3d8bbwe\Assets\contrast-black\OneConnectAppList.targetsize-36.png ATOMSILO_2.exe File opened for modification \??\c:\Program Files\Microsoft Office\root\Licenses16\ProjectStd2019R_Retail-ppd.xrm-ms ATOMSILO_2.exe File opened for modification \??\c:\Program Files\Microsoft Office\root\Office16\1033\WINWORD_COL.HXC ATOMSILO_2.exe File opened for modification \??\c:\Program Files\Microsoft Office\root\rsod\osmmui.msi.16.en-us.tree.dat ATOMSILO_2.exe File opened for modification \??\c:\Program Files\WindowsApps\microsoft.windowscommunicationsapps_17.7906.42257.0_x64__8wekyb3d8bbwe\images\bg5.jpg ATOMSILO_2.exe File opened for modification \??\c:\Program Files\WindowsApps\microsoft.windowscommunicationsapps_17.7906.42257.0_x64__8wekyb3d8bbwe\images\bg6_thumb.png ATOMSILO_2.exe File opened for modification \??\c:\Program Files\WindowsApps\Microsoft.SkypeApp_11.8.204.0_x64__kzf8qxf38zg5c\SkypeApp\Designs\Flags\large\jp_60x42.png ATOMSILO_2.exe File opened for modification \??\c:\Program Files\WindowsApps\Microsoft.WindowsFeedbackHub_1.1612.10312.0_x64__8wekyb3d8bbwe\AppxBlockMap.xml ATOMSILO_2.exe File opened for modification \??\c:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\aicuc\js\nls\nb-no\ui-strings.js ATOMSILO_2.exe File opened for modification \??\c:\Program Files\VideoLAN\VLC\lua\meta\art\02_frenchtv.luac ATOMSILO_2.exe File opened for modification \??\c:\Program Files\WindowsApps\Microsoft.MicrosoftSolitaireCollection_3.14.1181.0_x64__8wekyb3d8bbwe\Assets\Solitaire25.png ATOMSILO_2.exe File opened for modification \??\c:\Program Files\WindowsApps\Microsoft.Office.OneNote_17.7668.58071.0_x64__8wekyb3d8bbwe\animations\OneNoteFRE_Welcome.mp4 ATOMSILO_2.exe File opened for modification \??\c:\Program Files\WindowsApps\Microsoft.SkypeApp_11.8.204.0_x64__kzf8qxf38zg5c\SkypeApp\Assets\LockScreenBadgeLogo.scale-200.png ATOMSILO_2.exe File opened for modification \??\c:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\tracked-send\js\plugins\tracked-send\js\nls\ui-strings.js ATOMSILO_2.exe File opened for modification \??\c:\Program Files\WindowsApps\DeletedAllUserPackages\Microsoft.WindowsAlarms_10.1702.333.0_neutral_split.scale-125_8wekyb3d8bbwe\Assets\TimerLargeTile.contrast-white_scale-125.png ATOMSILO_2.exe File opened for modification \??\c:\Program Files\WindowsApps\Microsoft.DesktopAppInstaller_1.0.10252.0_x64__8wekyb3d8bbwe\AppxManifest.xml ATOMSILO_2.exe File opened for modification \??\c:\Program Files\WindowsApps\Microsoft.Messaging_3.26.24002.0_x64__8wekyb3d8bbwe\TEE\generic.Messaging.config ATOMSILO_2.exe File opened for modification \??\c:\Program Files\WindowsApps\Microsoft.Office.OneNote_17.7668.58071.0_x64__8wekyb3d8bbwe\images\8201_48x48x32.png ATOMSILO_2.exe File created \??\c:\Program Files\WindowsApps\Microsoft.ZuneMusic_10.16112.11621.0_neutral_resources.scale-150_8wekyb3d8bbwe\Assets\README-FILE-GFBFPSXA-1633373518.hta ATOMSILO_2.exe File created \??\c:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\my-recent-files\js\nls\zh-tw\README-FILE-GFBFPSXA-1633373518.hta ATOMSILO_2.exe File opened for modification \??\c:\Program Files\Java\jdk1.8.0_66\lib\visualvm\visualvm\config\Modules\com-sun-tools-visualvm-host-remote.xml ATOMSILO_2.exe File opened for modification \??\c:\Program Files\WindowsApps\Microsoft.Office.OneNote_17.7668.58071.0_x64__8wekyb3d8bbwe\images\contrast-black\OneNoteNotebookMedTile.scale-400.png ATOMSILO_2.exe File opened for modification \??\c:\Program Files\WindowsApps\Microsoft.SkypeApp_11.8.204.0_x64__kzf8qxf38zg5c\SkypeApp\Designs\Flags\large\ma_60x42.png ATOMSILO_2.exe File opened for modification \??\c:\Program Files\WindowsApps\Microsoft.WindowsCalculator_10.1702.312.0_x64__8wekyb3d8bbwe\Assets\CalculatorAppList.targetsize-256.png ATOMSILO_2.exe File created \??\c:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\sample-files\js\nls\sl-sl\README-FILE-GFBFPSXA-1633373518.hta ATOMSILO_2.exe File opened for modification \??\c:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\scan-files\images\themeless\Playstore\nl_get.svg ATOMSILO_2.exe File opened for modification \??\c:\Program Files (x86)\WindowsPowerShell\Modules\Pester\3.4.0\Snippets\ShouldNotContain.snippets.ps1xml ATOMSILO_2.exe File opened for modification \??\c:\Program Files\Java\jdk1.8.0_66\lib\visualvm\platform\modules\locale\org-openide-explorer_ja.jar ATOMSILO_2.exe File opened for modification \??\c:\Program Files\Microsoft Office\root\Office16\sdxs\FA000000027\assets\Icons\[email protected] ATOMSILO_2.exe File opened for modification \??\c:\Program Files\WindowsApps\DeletedAllUserPackages\Microsoft.WindowsMaps_5.1611.10393.0_neutral_split.scale-125_8wekyb3d8bbwe\Assets\SecondaryTiles\Directions\Work\RTL\contrast-white\MedTile.scale-125.png ATOMSILO_2.exe File created \??\c:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\app-center\js\nls\ko-kr\README-FILE-GFBFPSXA-1633373518.hta ATOMSILO_2.exe File opened for modification \??\c:\Program Files\WindowsApps\Microsoft.MSPaint_1.1702.28017.0_x64__8wekyb3d8bbwe\Assets\Images\Stickers\Sticker_CatEye.png ATOMSILO_2.exe File opened for modification \??\c:\Program Files\WindowsApps\Microsoft.XboxApp_25.25.13009.0_x64__8wekyb3d8bbwe\Microsoft.Xbox.SmartGlass.Controls\BridgedWebBrowser.xaml ATOMSILO_2.exe File opened for modification \??\c:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\core\dev\nls\ro-ro\ui-strings.js ATOMSILO_2.exe File opened for modification \??\c:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\on-boarding\images\themeless\HomeBanner-3x.png ATOMSILO_2.exe File created \??\c:\Program Files\README-FILE-GFBFPSXA-1633373518.hta ATOMSILO_2.exe File opened for modification \??\c:\Program Files\Microsoft Office\root\Licenses16\ProjectStd2019R_Retail-ul-oob.xrm-ms ATOMSILO_2.exe File created \??\c:\Program Files\WindowsApps\DeletedAllUserPackages\Microsoft.SkypeApp_11.8.204.0_neutral_split.scale-125_kzf8qxf38zg5c\SkypeApp\Assets\README-FILE-GFBFPSXA-1633373518.hta ATOMSILO_2.exe File opened for modification \??\c:\Program Files\WindowsApps\Microsoft.MicrosoftSolitaireCollection_3.14.1181.0_x64__8wekyb3d8bbwe\Arkadium.Win10.Awards\Assets\Awards_cup.png ATOMSILO_2.exe File opened for modification \??\c:\Program Files\Java\jdk1.8.0_66\db\bin\setNetworkServerCP ATOMSILO_2.exe -
Runs ping.exe 1 TTPs 1 IoCs
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Suspicious use of WriteProcessMemory 24 IoCs
Processes:
ATOMSILO_2.execmd.exedescription pid process target process PID 900 wrote to memory of 3980 900 ATOMSILO_2.exe mshta.exe PID 900 wrote to memory of 3980 900 ATOMSILO_2.exe mshta.exe PID 900 wrote to memory of 584 900 ATOMSILO_2.exe mshta.exe PID 900 wrote to memory of 584 900 ATOMSILO_2.exe mshta.exe PID 900 wrote to memory of 2856 900 ATOMSILO_2.exe mshta.exe PID 900 wrote to memory of 2856 900 ATOMSILO_2.exe mshta.exe PID 900 wrote to memory of 2868 900 ATOMSILO_2.exe mshta.exe PID 900 wrote to memory of 2868 900 ATOMSILO_2.exe mshta.exe PID 900 wrote to memory of 336 900 ATOMSILO_2.exe mshta.exe PID 900 wrote to memory of 336 900 ATOMSILO_2.exe mshta.exe PID 900 wrote to memory of 4040 900 ATOMSILO_2.exe mshta.exe PID 900 wrote to memory of 4040 900 ATOMSILO_2.exe mshta.exe PID 900 wrote to memory of 856 900 ATOMSILO_2.exe mshta.exe PID 900 wrote to memory of 856 900 ATOMSILO_2.exe mshta.exe PID 900 wrote to memory of 3888 900 ATOMSILO_2.exe mshta.exe PID 900 wrote to memory of 3888 900 ATOMSILO_2.exe mshta.exe PID 900 wrote to memory of 2416 900 ATOMSILO_2.exe mshta.exe PID 900 wrote to memory of 2416 900 ATOMSILO_2.exe mshta.exe PID 900 wrote to memory of 4024 900 ATOMSILO_2.exe mshta.exe PID 900 wrote to memory of 4024 900 ATOMSILO_2.exe mshta.exe PID 900 wrote to memory of 636 900 ATOMSILO_2.exe cmd.exe PID 900 wrote to memory of 636 900 ATOMSILO_2.exe cmd.exe PID 636 wrote to memory of 3176 636 cmd.exe PING.EXE PID 636 wrote to memory of 3176 636 cmd.exe PING.EXE
Processes
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C:\Users\Admin\AppData\Local\Temp\ATOMSILO_2.exe"C:\Users\Admin\AppData\Local\Temp\ATOMSILO_2.exe"1⤵
- Modifies extensions of user files
- Drops startup file
- Drops file in Program Files directory
- Suspicious use of WriteProcessMemory
PID:900 -
C:\Windows\SYSTEM32\mshta.exemshta "C:\Users\Public\ATOMSILO-README.hta"2⤵PID:3980
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C:\Windows\SYSTEM32\mshta.exemshta "C:\Users\Public\ATOMSILO-README.hta"2⤵PID:2856
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C:\Windows\SYSTEM32\mshta.exemshta "C:\Users\Public\ATOMSILO-README.hta"2⤵PID:584
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C:\Windows\SYSTEM32\mshta.exemshta "C:\Users\Public\ATOMSILO-README.hta"2⤵PID:2868
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C:\Windows\SYSTEM32\mshta.exemshta "C:\Users\Public\ATOMSILO-README.hta"2⤵PID:336
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C:\Windows\SYSTEM32\mshta.exemshta "C:\Users\Public\ATOMSILO-README.hta"2⤵PID:4040
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C:\Windows\SYSTEM32\mshta.exemshta "C:\Users\Public\ATOMSILO-README.hta"2⤵PID:856
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C:\Windows\SYSTEM32\mshta.exemshta "C:\Users\Public\ATOMSILO-README.hta"2⤵PID:3888
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C:\Windows\SYSTEM32\mshta.exemshta "C:\Users\Public\ATOMSILO-README.hta"2⤵PID:2416
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C:\Windows\SYSTEM32\mshta.exemshta "C:\Users\Public\ATOMSILO-README.hta"2⤵PID:4024
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C:\Windows\SYSTEM32\cmd.execmd /c ping 127.0.0.1 -n 6 && del "C:\Users\Admin\AppData\Local\Temp\ATOMSILO_2.exe"2⤵
- Suspicious use of WriteProcessMemory
PID:636 -
C:\Windows\system32\PING.EXEping 127.0.0.1 -n 63⤵
- Runs ping.exe
PID:3176
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Network
MITRE ATT&CK Enterprise v6
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Downloads
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MD5
491ea317fb6c8b6480e466c7f9609882
SHA1174a6b3a5746f0e9c4147c84f9f4886a81c00596
SHA25662895cbddaa94033f325b454d177aa0d1db3c0e33d6042fcf26bde1f7886f4f6
SHA5126a7146b513e3872d273f2fcc3114c6f1951b1fd0472735614ad1e77b5fdbebebb89d5127f1db9c5cdbb7340092f33a11bd8a1d67fe31ce22c835194667cfe4f1