Analysis Overview
SHA256
23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2
Threat Level: Known bad
The file 23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2.sample was found to be: Known bad.
Malicious Activity Summary
Ryuk
Modifies extensions of user files
Deletes itself
Loads dropped DLL
Executes dropped EXE
Checks computer location settings
Adds Run key to start application
Drops file in Program Files directory
Enumerates physical storage devices
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
MITRE ATT&CK Matrix V6
Analysis: static1
Detonation Overview
Reported
2023-02-11 10:59
Signatures
Analysis: behavioral1
Detonation Overview
Submitted
2023-02-11 10:59
Reported
2023-02-11 11:01
Platform
win7-20220812-en
Max time kernel
51s
Max time network
45s
Command Line
Signatures
Ryuk
Modifies extensions of user files
| Description | Indicator | Process | Target |
| File opened for modification | C:\Users\Admin\Pictures\ConfirmCompress.tiff | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Users\Admin\Pictures\NewSuspend.tiff | C:\Windows\system32\taskhost.exe | N/A |
Deletes itself
| Description | Indicator | Process | Target |
| N/A | N/A | C:\users\Public\PQveL.exe | N/A |
Executes dropped EXE
| Description | Indicator | Process | Target |
| N/A | N/A | C:\users\Public\PQveL.exe | N/A |
Loads dropped DLL
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2.exe | N/A |
Adds Run key to start application
| Description | Indicator | Process | Target |
| Key created | \REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run | C:\Windows\system32\reg.exe | N/A |
| Set value (str) | \REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Windows\CurrentVersion\Run\svchos = "C:\\users\\Public\\PQveL.exe" | C:\Windows\system32\reg.exe | N/A |
Drops file in Program Files directory
| Description | Indicator | Process | Target |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\J0105286.WMF | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\NA00462_.WMF | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\Office14\Groove\ToolData\groove.net\GrooveForms\viewDblClick.js | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\Office14\Groove\ToolData\groove.net\GrooveForms4\bg_FormsHomePageBlank.gif | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\Office14\OLKIRM.XML | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\Office14\PUBWIZ\SIDBAR98.POC | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files\Java\jdk1.7.0_80\jre\lib\zi\Pacific\Kosrae | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files\Java\jre7\lib\zi\America\Miquelon | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Common Files\microsoft shared\VBA\VBA6\RyukReadMe.txt | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\FD00086_.WMF | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Adobe\Reader 9.0\Resource\TypeSupport\Unicode\Mappings\Adobe\zdingbat.txt | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\MEDIA\OFFICE14\BULLETS\BD14980_.GIF | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\Office14\1033\PUBSPAPR\ZPDIR1F.GIF | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\Office14\1033\PUBSPAPR\ZPDIR21F.GIF | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files\Common Files\Microsoft Shared\ink\ipsnld.xml | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files\VideoLAN\VLC\lua\http\requests\vlm_cmd.xml | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Adobe\Reader 9.0\Reader\RyukReadMe.txt | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\MEDIA\CAGCAT10\J0284916.JPG | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\Office14\Groove\ToolData\groove.net\GrooveForms4\bg_Country.gif | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files\VideoLAN\VLC\AUTHORS.txt | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\DD01162_.WMF | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\NA00809_.WMF | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files\Java\jre7\lib\zi\SystemV\EST5 | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\AG00120_.GIF | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\BL00262_.WMF | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\BS00100_.WMF | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\PE00272_.WMF | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files\Java\jdk1.7.0_80\lib\missioncontrol\dropins\RyukReadMe.txt | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files\Java\jdk1.7.0_80\lib\visualvm\platform\modules\org-netbeans-core-io-ui.jar | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files\Java\jdk1.7.0_80\lib\visualvm\profiler\modules\org-netbeans-modules-profiler-api.jar | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\SO00466_.WMF | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\Office14\Groove\ToolData\groove.net\GrooveForms\FormsTemplates\Track Issues.fdt | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Common Files\System\msadc\handsafe.reg | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files\Common Files\System\ado\adovbs.inc | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files\Java\jdk1.7.0_80\jre\lib\zi\America\Managua | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files\VideoLAN\VLC\locale\ks_IN\RyukReadMe.txt | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Common Files\microsoft shared\THEMES14\EVRGREEN\EVRGREEN.ELM | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Common Files\microsoft shared\THEMES14\ICE\PREVIEW.GIF | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\Office14\OutlookAutoDiscover\YAHOO.COM.PH.XML | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files\Common Files\Microsoft Shared\Stationery\Genko_2.emf | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files\Java\jdk1.7.0_80\lib\visualvm\visualvm\config\Modules\org-openide-options.xml_hidden | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files\Microsoft Games\Multiplayer\Spades\it-IT\RyukReadMe.txt | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files\Java\jdk1.7.0_80\jre\lib\zi\Asia\Novosibirsk | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\MEDIA\OFFICE14\BULLETS\BD14530_.GIF | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\Office14\Groove\ToolData\groove.net\GrooveForms\BG_ADOBE.GIF | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\Office14\Groove\Sounds\Places\TOOT.WAV | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files\Java\jdk1.7.0_80\lib\missioncontrol\plugins\org.eclipse.equinox.event_1.3.100.v20140115-1647.jar | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files\Java\jre7\lib\zi\Asia\Macau | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\SO00910_.WMF | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\SO00683_.WMF | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Visual Studio 8\Common7\IDE\VSTA\ItemTemplates\VisualBasic\1033\Text.zip | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files\VideoLAN\VLC\locale\mr\LC_MESSAGES\vlc.mo | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\FD00403_.WMF | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\J0101863.BMP | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\Office14\Groove\ToolData\groove.net\GrooveForms4\FormsColorChart.html | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files\Java\jre7\lib\logging.properties | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\J0107302.WMF | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\Document Themes 14\Theme Effects\Flow.eftx | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\J0105588.WMF | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\J0239973.WMF | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\Office14\Groove\ToolData\groove.net\GrooveForms4\FormsStyles\STS2\HEADER.GIF | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\v3.0\RyukReadMe.txt | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files\VideoLAN\VLC\lua\http\css\ui-lightness\images\ui-bg_diagonals-thick_18_b81900_40x40.png | C:\Windows\system32\taskhost.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\Office14\1033\PUBSPAPR\ZPDIR46F.GIF | C:\Windows\system32\taskhost.exe | N/A |
Enumerates physical storage devices
Suspicious behavior: EnumeratesProcesses
| Description | Indicator | Process | Target |
| N/A | N/A | C:\users\Public\PQveL.exe | N/A |
Suspicious use of AdjustPrivilegeToken
| Description | Indicator | Process | Target |
| Token: SeDebugPrivilege | N/A | C:\users\Public\PQveL.exe | N/A |
Suspicious use of WriteProcessMemory
Processes
C:\Windows\system32\taskhost.exe
"taskhost.exe"
C:\Windows\system32\Dwm.exe
"C:\Windows\system32\Dwm.exe"
C:\Users\Admin\AppData\Local\Temp\23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2.exe
"C:\Users\Admin\AppData\Local\Temp\23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2.exe"
C:\users\Public\PQveL.exe
"C:\users\Public\PQveL.exe" C:\Users\Admin\AppData\Local\Temp\23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2.exe
C:\Windows\System32\cmd.exe
"C:\Windows\System32\cmd.exe" /C REG ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "svchos" /t REG_SZ /d "C:\users\Public\PQveL.exe" /f
C:\Windows\system32\reg.exe
REG ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "svchos" /t REG_SZ /d "C:\users\Public\PQveL.exe" /f
Network
Files
memory/1916-54-0x0000000075C51000-0x0000000075C53000-memory.dmp
\Users\Public\PQveL.exe
| MD5 | 31bd0f224e7e74eee2847f43aae23974 |
| SHA1 | 92e331e1e8ad30538f38dd7ba31386afafa14a58 |
| SHA256 | 8b0a5fb13309623c3518473551cb1f55d38d8450129d4a3c16b476f7b2867d7d |
| SHA512 | a13f05a12b084ef425f542ff4be824bbccb5dbdfe085af8b7e19d81a6bcba4b8c1debcc38f6b57bc9265a4db21eed70852ece8cc62b3ef14c47fca3035a55249 |
memory/1656-56-0x0000000000000000-mapping.dmp
C:\Users\Public\PQveL.exe
| MD5 | 31bd0f224e7e74eee2847f43aae23974 |
| SHA1 | 92e331e1e8ad30538f38dd7ba31386afafa14a58 |
| SHA256 | 8b0a5fb13309623c3518473551cb1f55d38d8450129d4a3c16b476f7b2867d7d |
| SHA512 | a13f05a12b084ef425f542ff4be824bbccb5dbdfe085af8b7e19d81a6bcba4b8c1debcc38f6b57bc9265a4db21eed70852ece8cc62b3ef14c47fca3035a55249 |
memory/1656-58-0x000007FEFB901000-0x000007FEFB903000-memory.dmp
memory/1616-59-0x0000000000000000-mapping.dmp
memory/1128-60-0x000000013FB20000-0x000000013FEAE000-memory.dmp
memory/844-62-0x0000000000000000-mapping.dmp
memory/1128-63-0x000000013FB20000-0x000000013FEAE000-memory.dmp
memory/1128-66-0x000000013FB20000-0x000000013FEAE000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2023-02-11 10:59
Reported
2023-02-11 11:00
Platform
win10v2004-20220901-en
Max time kernel
9s
Max time network
16s
Command Line
Signatures
Checks computer location settings
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation | C:\Users\Admin\AppData\Local\Temp\23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2.exe | N/A |
| Key value queried | \REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation | C:\users\Public\qNpxX.exe | N/A |
Executes dropped EXE
| Description | Indicator | Process | Target |
| N/A | N/A | C:\users\Public\qNpxX.exe | N/A |
Adds Run key to start application
| Description | Indicator | Process | Target |
| Key created | \REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run | C:\Windows\system32\reg.exe | N/A |
| Set value (str) | \REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\svchos = "C:\\users\\Public\\qNpxX.exe" | C:\Windows\system32\reg.exe | N/A |
Enumerates physical storage devices
Suspicious behavior: EnumeratesProcesses
| Description | Indicator | Process | Target |
| N/A | N/A | C:\users\Public\qNpxX.exe | N/A |
| N/A | N/A | C:\users\Public\qNpxX.exe | N/A |
Suspicious use of AdjustPrivilegeToken
| Description | Indicator | Process | Target |
| Token: SeDebugPrivilege | N/A | C:\users\Public\qNpxX.exe | N/A |
Suspicious use of WriteProcessMemory
Processes
C:\Windows\system32\sihost.exe
sihost.exe
C:\Windows\system32\DllHost.exe
C:\Windows\system32\DllHost.exe /Processid:{3EB3C877-1F16-487C-9050-104DBCD66683}
C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k ClipboardSvcGroup -p -s cbdhsvc
C:\Windows\system32\taskhostw.exe
taskhostw.exe {222A245B-E637-4AE9-A93F-A59CA119A75E}
C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k UnistackSvcGroup -s CDPUserSvc
C:\Users\Admin\AppData\Local\Temp\23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2.exe
"C:\Users\Admin\AppData\Local\Temp\23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2.exe"
C:\users\Public\qNpxX.exe
"C:\users\Public\qNpxX.exe" C:\Users\Admin\AppData\Local\Temp\23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2.exe
C:\Windows\System32\cmd.exe
"C:\Windows\System32\cmd.exe" /C REG ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "svchos" /t REG_SZ /d "C:\users\Public\qNpxX.exe" /f
C:\Windows\system32\reg.exe
REG ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "svchos" /t REG_SZ /d "C:\users\Public\qNpxX.exe" /f
Network
| Country | Destination | Domain | Proto |
| US | 67.24.25.254:80 | tcp |
Files
memory/1028-132-0x0000000000000000-mapping.dmp
C:\Users\Public\qNpxX.exe
| MD5 | 31bd0f224e7e74eee2847f43aae23974 |
| SHA1 | 92e331e1e8ad30538f38dd7ba31386afafa14a58 |
| SHA256 | 8b0a5fb13309623c3518473551cb1f55d38d8450129d4a3c16b476f7b2867d7d |
| SHA512 | a13f05a12b084ef425f542ff4be824bbccb5dbdfe085af8b7e19d81a6bcba4b8c1debcc38f6b57bc9265a4db21eed70852ece8cc62b3ef14c47fca3035a55249 |
C:\users\Public\qNpxX.exe
| MD5 | 31bd0f224e7e74eee2847f43aae23974 |
| SHA1 | 92e331e1e8ad30538f38dd7ba31386afafa14a58 |
| SHA256 | 8b0a5fb13309623c3518473551cb1f55d38d8450129d4a3c16b476f7b2867d7d |
| SHA512 | a13f05a12b084ef425f542ff4be824bbccb5dbdfe085af8b7e19d81a6bcba4b8c1debcc38f6b57bc9265a4db21eed70852ece8cc62b3ef14c47fca3035a55249 |
memory/5016-135-0x0000000000000000-mapping.dmp
memory/1380-136-0x0000000000000000-mapping.dmp
memory/2388-137-0x00007FF7BF2B0000-0x00007FF7BF63E000-memory.dmp
memory/2400-138-0x00007FF7BF2B0000-0x00007FF7BF63E000-memory.dmp