Malware Analysis Report

2024-10-19 06:16

Sample ID 220220-f1lc5ahah8
Target 7e02efaf98a1343c6a41a9e084c62567f99386a4046f68a658a8d667c3834305
SHA256 7e02efaf98a1343c6a41a9e084c62567f99386a4046f68a658a8d667c3834305
Tags
ryuk persistence ransomware
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V6

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

7e02efaf98a1343c6a41a9e084c62567f99386a4046f68a658a8d667c3834305

Threat Level: Known bad

The file 7e02efaf98a1343c6a41a9e084c62567f99386a4046f68a658a8d667c3834305 was found to be: Known bad.

Malicious Activity Summary

ryuk persistence ransomware

Ryuk

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

Analysis: static1

Detonation Overview

Reported

2022-02-20 05:20

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2022-02-20 05:20

Reported

2022-02-20 05:49

Platform

win7-en-20211208

Max time kernel

177s

Max time network

29s

Command Line

"taskhost.exe"

Signatures

Ryuk

ransomware ryuk

Adds Run key to start application

persistence
Description Indicator Process Target
Key created \REGISTRY\USER\S-1-5-21-3846991908-3261386348-1409841751-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run C:\Windows\system32\reg.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-3846991908-3261386348-1409841751-1000\Software\Microsoft\Windows\CurrentVersion\Run\svchos = "C:\\Users\\Admin\\AppData\\Local\\Temp\\7e02efaf98a1343c6a41a9e084c62567f99386a4046f68a658a8d667c3834305.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\Java\jre7\lib\fonts\LucidaBrightDemiItalic.ttf C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Common Files\Microsoft Shared\ink\ipshrv.xml C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Common Files\Microsoft Shared\OFFICE14\Cultures\RyukReadMe.txt C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\DVD Maker\Shared\DvdStyles\RyukReadMe.txt C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\lib\missioncontrol\plugins\org.eclipse.ui.themes.nl_ja_4.4.0.v20140623020002.jar C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\lib\visualvm\platform\.lastModified C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\lib\missioncontrol\plugins\org.eclipse.ui.themes_1.0.1.v20140819-1717\RyukReadMe.txt C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\lib\visualvm\profiler\lib\deployed\jdk16\windows-amd64\RyukReadMe.txt C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\lib\visualvm\visualvm\update_tracking\com-sun-tools-visualvm-host.xml C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\DVD Maker\Shared\DvdStyles\Push\NavigationLeft_ButtonGraphic.png C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\DVD Maker\Shared\DvdStyles\ResizingPanels\NavigationLeft_SelectionSubpicture.png C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\include\classfile_constants.h C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\jre\lib\zi\America\Recife C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\jre\lib\zi\Etc\UCT C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Common Files\Services\RyukReadMe.txt C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\RyukReadMe.txt C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\lib\visualvm\visualvm\modules\com-sun-tools-visualvm-profiling.jar C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\DVD Maker\Shared\DvdStyles\scene_button_style_default_Thumbnail.bmp C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\jre\lib\zi\Asia\Dushanbe C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\lib\missioncontrol\features\org.eclipse.babel.nls_eclipse_ja_4.4.0.v20140623020002\feature.properties C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\lib\visualvm\RyukReadMe.txt C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jre7\lib\deploy\ffjcext.zip C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jre7\lib\zi\Africa\Bissau C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\DVD Maker\Shared\DvdStyles\HueCycle\NavigationRight_SelectionSubpicture.png C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\include\jdwpTransport.h C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\jre\lib\zi\Australia\Lindeman C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\lib\missioncontrol\features\org.eclipse.ecf.core.ssl.feature_1.0.0.v20140827-1444\META-INF\MANIFEST.MF 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.p2.touchpoint.natives.nl_ja_4.4.0.v20140623020002.jar C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\lib\visualvm\profiler\lib\deployed\jdk15\RyukReadMe.txt C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\DVD Maker\Shared\DvdStyles\Shatter\NavigationUp_SelectionSubpicture.png C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\db\lib\derbyclient.jar C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\jre\lib\zi\Europe\Lisbon C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\jre\lib\zi\Europe\Zaporozhye 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.launcher.win32.win32.x86_64_1.1.200.v20141007-2033\RyukReadMe.txt C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\lib\visualvm\visualvm\modules\locale\com-sun-tools-visualvm-heapdump_zh_CN.jar C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\DVD Maker\Shared\DvdStyles\Memories\btn-previous-static.png C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\DVD Maker\Shared\DvdStyles\Performance\Notes_loop.wmv C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\db\README-JDK.html C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\jre\lib\fonts\RyukReadMe.txt C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\jre\lib\zi\America\Havana C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\DVD Maker\fr-FR\RyukReadMe.txt C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\lib\missioncontrol\features\org.eclipse.ecf.filetransfer.feature_3.9.0.v20140827-1444\asl-v20.txt C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\lib\visualvm\profiler\config\Modules\org-netbeans-modules-profiler.xml 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-modules-masterfs.jar C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\lib\visualvm\visualvm\config\Modules\com-sun-tools-visualvm-coredump.xml C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\7-Zip\Lang\sa.txt C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\DVD Maker\Shared\DvdStyles\Performance\NextMenuButtonIconSubpictur.png C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\DVD Maker\Shared\DvdStyles\Push\push.png C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Google\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\Tokyo C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\jre\lib\zi\Europe\London C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\lib\missioncontrol\plugins\org.apache.batik.util.gui_1.7.0.v200903091627.jar C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\lib\visualvm\etc\visualvm.clusters C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Common Files\Microsoft Shared\ink\fsdefinitions\symbols.xml C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\DVD Maker\Shared\DvdStyles\HueCycle\huemainsubpicture2.png C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\jre\lib\jfr\RyukReadMe.txt C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\jre\lib\images\cursors\win32_CopyDrop32x32.gif C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\jre\lib\zi\Europe\Volgograd C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\lib\visualvm\platform\config\ModuleAutoDeps\org-netbeans-modules-queries.xml C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\lib\visualvm\platform\lib\org-openide-modules.jar C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jre7\lib\zi\America\Costa_Rica C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\jre\lib\zi\EST C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\lib\missioncontrol\features\com.jrockit.mc.rcp.product_5.5.0.165303\RyukReadMe.txt C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\lib\visualvm\profiler\update_tracking\org-netbeans-modules-profiler.xml C:\Windows\system32\taskhost.exe N/A

Enumerates physical storage devices

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\7e02efaf98a1343c6a41a9e084c62567f99386a4046f68a658a8d667c3834305.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\7e02efaf98a1343c6a41a9e084c62567f99386a4046f68a658a8d667c3834305.exe N/A

Processes

C:\Windows\system32\taskhost.exe

"taskhost.exe"

C:\Windows\system32\Dwm.exe

"C:\Windows\system32\Dwm.exe"

C:\Users\Admin\AppData\Local\Temp\7e02efaf98a1343c6a41a9e084c62567f99386a4046f68a658a8d667c3834305.exe

"C:\Users\Admin\AppData\Local\Temp\7e02efaf98a1343c6a41a9e084c62567f99386a4046f68a658a8d667c3834305.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\Admin\AppData\Local\Temp\7e02efaf98a1343c6a41a9e084c62567f99386a4046f68a658a8d667c3834305.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\Admin\AppData\Local\Temp\7e02efaf98a1343c6a41a9e084c62567f99386a4046f68a658a8d667c3834305.exe" /f

Network

N/A

Files

memory/1452-54-0x000007FEFBC11000-0x000007FEFBC13000-memory.dmp

memory/1108-55-0x000000013FEB0000-0x000000014023E000-memory.dmp

memory/1108-57-0x000000013FEB0000-0x000000014023E000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2022-02-20 05:20

Reported

2022-02-20 05:48

Platform

win10v2004-en-20220113

Max time kernel

42s

Max time network

109s

Command Line

taskhostw.exe {222A245B-E637-4AE9-A93F-A59CA119A75E}

Signatures

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-1346565761-3498240568-4147300184-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\7e02efaf98a1343c6a41a9e084c62567f99386a4046f68a658a8d667c3834305.exe N/A

Enumerates physical storage devices

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\7e02efaf98a1343c6a41a9e084c62567f99386a4046f68a658a8d667c3834305.exe N/A

Processes

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:\Windows\system32\sihost.exe

sihost.exe

C:\Users\Admin\AppData\Local\Temp\7e02efaf98a1343c6a41a9e084c62567f99386a4046f68a658a8d667c3834305.exe

"C:\Users\Admin\AppData\Local\Temp\7e02efaf98a1343c6a41a9e084c62567f99386a4046f68a658a8d667c3834305.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\Admin\AppData\Local\Temp\7e02efaf98a1343c6a41a9e084c62567f99386a4046f68a658a8d667c3834305.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\Admin\AppData\Local\Temp\7e02efaf98a1343c6a41a9e084c62567f99386a4046f68a658a8d667c3834305.exe" /f

Network

Country Destination Domain Proto
US 8.8.8.8:53 crl4.digicert.com udp
US 93.184.220.29:80 crl4.digicert.com tcp

Files

memory/2356-130-0x00007FF614030000-0x00007FF6143BE000-memory.dmp