Malware Analysis Report

2024-10-23 18:37

Sample ID 220220-egaa3sgde5
Target a0dccbe010859116063fc3f7e00c8c7bd68b849eeb7238a10b1b9f07f5c36510
SHA256 a0dccbe010859116063fc3f7e00c8c7bd68b849eeb7238a10b1b9f07f5c36510
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

a0dccbe010859116063fc3f7e00c8c7bd68b849eeb7238a10b1b9f07f5c36510

Threat Level: Known bad

The file a0dccbe010859116063fc3f7e00c8c7bd68b849eeb7238a10b1b9f07f5c36510 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 03:54

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2022-02-20 03:54

Reported

2022-02-20 04:07

Platform

win7-en-20211208

Max time kernel

169s

Max time network

142s

Command Line

"taskhost.exe"

Signatures

Ryuk

ransomware ryuk

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-2329389628-4064185017-3901522362-1000\Software\Microsoft\Windows\CurrentVersion\Run\svchos = "C:\\Users\\Admin\\AppData\\Local\\Temp\\a0dccbe010859116063fc3f7e00c8c7bd68b849eeb7238a10b1b9f07f5c36510.exe" C:\Windows\system32\reg.exe N/A
Key created \REGISTRY\USER\S-1-5-21-2329389628-4064185017-3901522362-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run 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\jdk1.7.0_80\jre\lib\zi\Asia\Pyongyang C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Common Files\Microsoft Shared\ink\zh-TW\RyukReadMe.txt C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\ExpandConfirm.pcx C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\db\bin\setNetworkClientCP.bat C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\DVD Maker\Shared\DvdStyles\Performance\Title_Trans_Scene_PAL.wmv C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\include\jni.h C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\include\win32\bridge\AccessBridgePackages.h C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\jre\lib\management\jmxremote.password.template C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Common Files\Microsoft Shared\ink\fsdefinitions\numbers\numbase.xml C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Common Files\Microsoft Shared\TextConv\fr-FR\RyukReadMe.txt C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\DVD Maker\Shared\DvdStyles\BabyBoy\BabyBoyNotesBackground_PAL.wmv C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\DVD Maker\Shared\DvdStyles\ResizingPanels\203x8subpicture.png C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\db\lib\derbyLocale_ru.jar C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\7-Zip\History.txt C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Common Files\Microsoft Shared\ink\zh-CN\RyukReadMe.txt C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Common Files\Microsoft Shared\TextConv\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\Kuala_Lumpur C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\jre\lib\zi\Etc\GMT-2 C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Common Files\Microsoft Shared\ink\fsdefinitions\main\zh-changjei.xml C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Common Files\System\msadc\adcjavas.inc C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\db\lib\derbyLocale_ko_KR.jar C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\DVD Maker\Shared\DvdStyles\Full\dotsdarkoverlay.png C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\DVD Maker\Shared\DvdStyles\Memories\Title_select-highlight.png C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\DVD Maker\Shared\DvdStyles\Pets\Pets_btn-back-over-select.png C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\DVD Maker\Shared\DvdStyles\ResizingPanels\NavigationUp_ButtonGraphic.png C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\jre\lib\zi\Atlantic\Reykjavik C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\7-Zip\descript.ion C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\7-Zip\Lang\fy.txt C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Common Files\Microsoft Shared\MSInfo\ja-JP\RyukReadMe.txt C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\DVD Maker\offset.ax C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\DVD Maker\Shared\DvdStyles\Stacking\15x15dot.png C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\jre\lib\javafx.properties C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\jre\lib\zi\Asia\Hong_Kong C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Common Files\Microsoft Shared\ink\fsdefinitions\main\baseAltGr_rtl.xml C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Common Files\Microsoft Shared\ink\ipsfin.xml C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Common Files\Microsoft Shared\Stationery\Seyes.emf C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Common Files\Microsoft Shared\ink\fsdefinitions\oskpred\RyukReadMe.txt C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\db\lib\derby.jar C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\jre\lib\zi\America\Metlakatla C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\jre\lib\zi\Australia\RyukReadMe.txt C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\7-Zip\Lang\ar.txt C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\DVD Maker\Shared\DvdStyles\ResizingPanels\blackbars80.png C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\db\bin\setEmbeddedCP C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Common Files\Microsoft Shared\Stationery\Connectivity.gif C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\DVD Maker\Shared\DvdStyles\OldAge\NavigationUp_SelectionSubpicture.png C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\7-Zip\Lang\mn.txt C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\jre\lib\zi\Africa\Accra C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\DVD Maker\Shared\DvdStyles\Travel\Passport_PAL.wmv C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\jre\lib\zi\America\Panama C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\jre\lib\zi\Asia\Riyadh C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\7-Zip\Lang\pt.txt C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Common Files\Microsoft Shared\ink\fsdefinitions\web\RyukReadMe.txt C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\DVD Maker\Shared\DvdStyles\Sports\sports_disc_mask.png C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\jre\lib\images\cursors\win32_MoveNoDrop32x32.gif C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\jre\lib\zi\Africa\Tripoli C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Common Files\Microsoft Shared\ink\fsdefinitions\oskpred\oskpredbase.xml C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Common Files\Microsoft Shared\ink\ipsen.xml C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Common Files\System\en-US\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\Cancun C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\jre\lib\zi\America\Glace_Bay C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\DVD Maker\Shared\DvdStyles\Rectangles\1047x576black.png C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\DVD Maker\Shared\DvdStyles\Stacking\1047x576_91n92.png C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\db\3RDPARTY C:\Windows\system32\taskhost.exe N/A
File opened for modification C:\Program Files\Common Files\System\Ole DB\de-DE\sqlxmlx.rll.mui 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\a0dccbe010859116063fc3f7e00c8c7bd68b849eeb7238a10b1b9f07f5c36510.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\a0dccbe010859116063fc3f7e00c8c7bd68b849eeb7238a10b1b9f07f5c36510.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\a0dccbe010859116063fc3f7e00c8c7bd68b849eeb7238a10b1b9f07f5c36510.exe

"C:\Users\Admin\AppData\Local\Temp\a0dccbe010859116063fc3f7e00c8c7bd68b849eeb7238a10b1b9f07f5c36510.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\a0dccbe010859116063fc3f7e00c8c7bd68b849eeb7238a10b1b9f07f5c36510.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\a0dccbe010859116063fc3f7e00c8c7bd68b849eeb7238a10b1b9f07f5c36510.exe" /f

Network

N/A

Files

memory/1624-55-0x000007FEFB731000-0x000007FEFB733000-memory.dmp

memory/1124-56-0x000000013F1E0000-0x000000013F56E000-memory.dmp

memory/1124-58-0x000000013F1E0000-0x000000013F56E000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2022-02-20 03:54

Reported

2022-02-20 04:08

Platform

win10v2004-en-20220113

Max time kernel

54s

Max time network

116s

Command Line

C:\Windows\system32\svchost.exe -k ClipboardSvcGroup -p -s cbdhsvc

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\a0dccbe010859116063fc3f7e00c8c7bd68b849eeb7238a10b1b9f07f5c36510.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\a0dccbe010859116063fc3f7e00c8c7bd68b849eeb7238a10b1b9f07f5c36510.exe N/A

Processes

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:\Windows\system32\sihost.exe

sihost.exe

C:\Users\Admin\AppData\Local\Temp\a0dccbe010859116063fc3f7e00c8c7bd68b849eeb7238a10b1b9f07f5c36510.exe

"C:\Users\Admin\AppData\Local\Temp\a0dccbe010859116063fc3f7e00c8c7bd68b849eeb7238a10b1b9f07f5c36510.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\a0dccbe010859116063fc3f7e00c8c7bd68b849eeb7238a10b1b9f07f5c36510.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\a0dccbe010859116063fc3f7e00c8c7bd68b849eeb7238a10b1b9f07f5c36510.exe" /f

Network

Files

memory/2316-130-0x00007FF7790A0000-0x00007FF77942E000-memory.dmp

memory/2332-131-0x00007FF7790A0000-0x00007FF77942E000-memory.dmp