ryuk | 23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2

General

Target

23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2.sample.exe
Size

384KB
MD5

5ac0f050f93f86e69026faea1fbb4450
SHA1

9709774fde9ec740ad6fed8ed79903296ca9d571
SHA256

23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2
SHA512

b554487c4e26a85ec5179cdcc1d25b5bc494e8821a8899fbbf868c3cf41f70cc72db107613b3f6655d3ab70f4db94cce2589066bb354b1ed955098d3911b844d

Score

10^/10

ryuk persistence ransomware

Malware Config

Extracted

Path

C:\RyukReadMe.txt

Family

ryuk

Ransom Note

Your network has been penetrated. All files on each host in the network have been encrypted with a strong algorithm. Backups were either encrypted or deleted or backup disks were formatted. Shadow copies also removed, so F8 or any other methods may damage encrypted data but not recover. We exclusively have decryption software for your situation No decryption software is available in the public. DO NOT RESET OR SHUTDOWN - files may be damaged. DO NOT RENAME OR MOVE the encrypted and readme files. DO NOT DELETE readme files. This may lead to the impossibility of recovery of the certain files. To get info (decrypt your files) contact us at WayneEvenson@protonmail.com or WayneEvenson@tutanota.com BTC wallet: 14hVKm7Ft2rxDBFTNkkRC3kGstMGp2A4hk Ryuk No system is safe

Emails

WayneEvenson@protonmail.com

WayneEvenson@tutanota.com

Wallets

14hVKm7Ft2rxDBFTNkkRC3kGstMGp2A4hk

Signatures

Ryuk
Ransomware distributed via existing botnets, often Trickbot or Emotet.
ransomware ryuk
Executes dropped EXE 1 IoCs

Processes:

MbmUP.exe

pid process

2956 MbmUP.exe
Deletes itself 1 IoCs

Processes:

MbmUP.exe

pid process

2956 MbmUP.exe
Drops startup file 1 IoCs

Processes:

sihost.exe

description ioc process

File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Word\STARTUP\RyukReadMe.txt sihost.exe

description	ioc	process
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Word\STARTUP\RyukReadMe.txt	sihost.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

reg.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-3686645723-710336880-414668232-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run	reg.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3686645723-710336880-414668232-1000\Software\Microsoft\Windows\CurrentVersion\Run\svchos = "C:\\users\\Public\\MbmUP.exe"	reg.exe

Drops file in Program Files directory 64 IoCs

Processes:

sihost.exe

description	ioc	process
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\O365EduCloudEDUR_Grace-ppd.xrm-ms	sihost.exe
File opened for modification	C:\Program Files\VideoLAN\VLC\locale\co\LC_MESSAGES\RyukReadMe.txt	sihost.exe
File opened for modification	C:\Program Files\VideoLAN\VLC\locale\tet\LC_MESSAGES\vlc.mo	sihost.exe
File opened for modification	C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\Locale\en_US\RyukReadMe.txt	sihost.exe
File opened for modification	C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\my-files\js\nls\eu-es\RyukReadMe.txt	sihost.exe
File opened for modification	C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\unified-share\images\RyukReadMe.txt	sihost.exe
File opened for modification	C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\on-boarding\images\themeless\add-comment.png	sihost.exe
File opened for modification	C:\Program Files\Java\jdk1.8.0_66\lib\missioncontrol\plugins\com.jrockit.mc.greychart.ui_5.5.0.165303.jar	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Office16\mscss7cm_en.dub	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\vfs\ProgramFilesCommonX64\Microsoft Shared\OFFICE16\DataModel\Cartridges\sql2000.xsl	sihost.exe
File opened for modification	C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\core\dev\nls\es-es\ui-strings.js	sihost.exe
File opened for modification	C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\editpdf\js\nls\es-es\RyukReadMe.txt	sihost.exe
File opened for modification	C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\editpdf\js\nls\uk-ua\RyukReadMe.txt	sihost.exe
File opened for modification	C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\fss\js\nls\hr-hr\ui-strings.js	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Office16\1033\ClientOSub_eula.txt	sihost.exe
File opened for modification	C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\css\main-cef-win8.css	sihost.exe
File opened for modification	C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\images\large_trefoil_2x.png	sihost.exe
File opened for modification	C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\sample-files\js\nls\en-ae\ui-strings.js	sihost.exe
File opened for modification	C:\Program Files\Java\jdk1.8.0_66\lib\visualvm\platform\config\Modules\org-openide-explorer.xml	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\MondoR_Subscription-pl.xrm-ms	sihost.exe
File opened for modification	C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\files\dev\nls\ca-es\RyukReadMe.txt	sihost.exe
File opened for modification	C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\activity-badge\js\nls\ru-ru\RyukReadMe.txt	sihost.exe
File opened for modification	C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\exportpdfupsell-app\js\nls\nb-no\RyukReadMe.txt	sihost.exe
File opened for modification	C:\Program Files\Java\jdk1.8.0_66\lib\visualvm\visualvm\modules\locale\com-sun-tools-visualvm-profiling_zh_CN.jar	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\ProjectStdXC2RVL_KMS_ClientC2R-ppd.xrm-ms	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\ProPlusR_Grace-ul-oob.xrm-ms	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Office16\MSWORD.OLB	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\vfs\ProgramFilesX64\Microsoft Analysis Services\AS OLEDB\140\Cartridges\RyukReadMe.txt	sihost.exe
File opened for modification	C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\activity-badge\RyukReadMe.txt	sihost.exe
File opened for modification	C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\my-recent-files\js\nls\pt-br\RyukReadMe.txt	sihost.exe
File opened for modification	C:\Program Files\Java\jdk1.8.0_66\lib\missioncontrol\p2\org.eclipse.equinox.p2.core\cache\binary\RyukReadMe.txt	sihost.exe
File opened for modification	C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\my-files\js\nls\zh-tw\RyukReadMe.txt	sihost.exe
File opened for modification	C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\pages-app\images\themes\dark\rhp_world_icon_hover.png	sihost.exe
File opened for modification	C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\reviews\js\nls\en-gb\ui-strings.js	sihost.exe
File opened for modification	C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\reviews\js\nls\ui-strings.js	sihost.exe
File opened for modification	C:\Program Files (x86)\Common Files\Microsoft Shared\Stationery\Soft Blue.htm	sihost.exe
File opened for modification	C:\Program Files\Common Files\microsoft shared\Triedit\RyukReadMe.txt	sihost.exe
File opened for modification	C:\Program Files\Java\jdk1.8.0_66\lib\visualvm\platform\update_tracking\org-netbeans-modules-applemenu.xml	sihost.exe
File opened for modification	C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\sample-files\js\nls\es-es\RyukReadMe.txt	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\HomeStudent2019R_OEM_Perp-ppd.xrm-ms	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Office16\1033\Client2019_eula.txt	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Document Themes 16\Theme Fonts\Tw Cen MT-Rockwell.xml	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\rsod\osmux.x-none.msi.16.x-none.tree.dat	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\vfs\ProgramFilesCommonX64\Microsoft Shared\TEXTCONV\RyukReadMe.txt	sihost.exe
File opened for modification	C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\files\dev\nls\fi-fi\ui-strings.js	sihost.exe
File opened for modification	C:\Program Files (x86)\Common Files\Adobe\Reader\DC\Linguistics\LanguageNames2\RyukReadMe.txt	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\vfs\ProgramFilesCommonX64\Microsoft Shared\Web Server Extensions\16\BIN\1033\FPEXT.MSG	sihost.exe
File opened for modification	C:\Program Files\VideoLAN\VLC\locale\ru\LC_MESSAGES\RyukReadMe.txt	sihost.exe
File opened for modification	C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\editpdf\js\nls\ro-ro\RyukReadMe.txt	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\vfs\ProgramFilesCommonX64\Microsoft Shared\THEMES16\CANYON\CANYON.INF	sihost.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	sihost.exe
File opened for modification	C:\Program Files\Java\jdk1.8.0_66\lib\missioncontrol\plugins\org.eclipse.jface.text.nl_ja_4.4.0.v20140623020002.jar	sihost.exe
File opened for modification	C:\Program Files\Java\jdk1.8.0_66\lib\visualvm\platform\config\Modules\org-netbeans-modules-autoupdate-ui.xml	sihost.exe
File opened for modification	C:\Program Files\Java\jdk1.8.0_66\lib\visualvm\platform\modules\locale\org-openide-nodes_zh_CN.jar	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\O365SmallBusPremR_Subscription5-pl.xrm-ms	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\Word2019R_Trial-ppd.xrm-ms	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\vfs\Fonts\private\MSJH.TTC	sihost.exe
File opened for modification	C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\fss\js\nls\ko-kr\ui-strings.js	sihost.exe
File opened for modification	C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\signatures\js\nls\pl-pl\RyukReadMe.txt	sihost.exe
File opened for modification	C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\tracked-send\js\viewer\nls\root\RyukReadMe.txt	sihost.exe
File opened for modification	C:\Program Files\Java\jdk1.8.0_66\db\lib\derbyLocale_zh_TW.jar	sihost.exe
File opened for modification	C:\Program Files\Java\jdk1.8.0_66\lib\missioncontrol\plugins\org.eclipse.equinox.p2.repository.nl_ja_4.4.0.v20140623020002.jar	sihost.exe
File opened for modification	C:\Program Files\VideoLAN\VLC\locale\fr\RyukReadMe.txt	sihost.exe
File opened for modification	C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\createpdfupsell-app\js\nls\root\ui-strings.js	sihost.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

3648 3660 WerFault.exe DllHost.exe

pid	pid_target	process	target process
3648	3660	WerFault.exe	DllHost.exe

Suspicious behavior: EnumeratesProcesses 17 IoCs

Processes:

MbmUP.exeWerFault.exe

pid	process
2956	MbmUP.exe
2956	MbmUP.exe
3648	WerFault.exe
3648	WerFault.exe
3648	WerFault.exe
3648	WerFault.exe
3648	WerFault.exe
3648	WerFault.exe
3648	WerFault.exe
3648	WerFault.exe
3648	WerFault.exe
3648	WerFault.exe
3648	WerFault.exe
3648	WerFault.exe
3648	WerFault.exe
3648	WerFault.exe
3648	WerFault.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

MbmUP.exeWerFault.exe

description pid process

Token: SeDebugPrivilege 2956 MbmUP.exe
Token: SeDebugPrivilege 3648 WerFault.exe

description	pid	process
Token: SeDebugPrivilege	2956	MbmUP.exe
Token: SeDebugPrivilege	3648	WerFault.exe

Suspicious use of WriteProcessMemory 13 IoCs

Processes:

23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2.sample.exeMbmUP.execmd.exe

description	pid	process	target process
PID 3740 wrote to memory of 2956	3740	23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2.sample.exe	MbmUP.exe
PID 3740 wrote to memory of 2956	3740	23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2.sample.exe	MbmUP.exe
PID 2956 wrote to memory of 1120	2956	MbmUP.exe	cmd.exe
PID 2956 wrote to memory of 1120	2956	MbmUP.exe	cmd.exe
PID 2956 wrote to memory of 2388	2956	MbmUP.exe	sihost.exe
PID 1120 wrote to memory of 2136	1120	cmd.exe	reg.exe
PID 1120 wrote to memory of 2136	1120	cmd.exe	reg.exe
PID 2956 wrote to memory of 2408	2956	MbmUP.exe	svchost.exe
PID 2956 wrote to memory of 2756	2956	MbmUP.exe	taskhostw.exe
PID 2956 wrote to memory of 3320	2956	MbmUP.exe	ShellExperienceHost.exe
PID 2956 wrote to memory of 3336	2956	MbmUP.exe	SearchUI.exe
PID 2956 wrote to memory of 3528	2956	MbmUP.exe	RuntimeBroker.exe
PID 2956 wrote to memory of 3660	2956	MbmUP.exe	DllHost.exe

c:\windows\system32\taskhostw.exe
taskhostw.exe {222A245B-E637-4AE9-A93F-A59CA119A75E}
1⤵
PID:2756

C:\Windows\SystemApps\Microsoft.Windows.Cortana_cw5n1h2txyewy\SearchUI.exe
"C:\Windows\SystemApps\Microsoft.Windows.Cortana_cw5n1h2txyewy\SearchUI.exe" -ServerName:CortanaUI.AppXa50dqqa5gqv4a428c9y1jjw7m3btvepj.mca
1⤵
PID:3336

C:\Windows\system32\DllHost.exe
C:\Windows\system32\DllHost.exe /Processid:{3EB3C877-1F16-487C-9050-104DBCD66683}
1⤵
PID:3660

C:\Windows\system32\WerFault.exe
C:\Windows\system32\WerFault.exe -u -p 3660 -s 836
2⤵
- Program crash
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:3648

C:\Windows\System32\RuntimeBroker.exe
C:\Windows\System32\RuntimeBroker.exe -Embedding
1⤵
PID:3528

C:\Windows\SystemApps\ShellExperienceHost_cw5n1h2txyewy\ShellExperienceHost.exe
"C:\Windows\SystemApps\ShellExperienceHost_cw5n1h2txyewy\ShellExperienceHost.exe" -ServerName:App.AppXtk181tbxbce2qsex02s8tw7hfxa9xb3t.mca
1⤵
PID:3320

c:\windows\system32\svchost.exe
c:\windows\system32\svchost.exe -k unistacksvcgroup -s CDPUserSvc
1⤵
PID:2408

c:\windows\system32\sihost.exe
sihost.exe
1⤵
- Drops startup file
- Drops file in Program Files directory
PID:2388

C:\Users\Admin\AppData\Local\Temp\23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2.sample.exe
"C:\Users\Admin\AppData\Local\Temp\23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2.sample.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:3740

C:\users\Public\MbmUP.exe
"C:\users\Public\MbmUP.exe" C:\Users\Admin\AppData\Local\Temp\23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2.sample.exe
2⤵
- Executes dropped EXE
- Deletes itself
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2956

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\MbmUP.exe" /f
3⤵
- Suspicious use of WriteProcessMemory
PID:1120

C:\Windows\system32\reg.exe
REG ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "svchos" /t REG_SZ /d "C:\users\Public\MbmUP.exe" /f
4⤵
- Adds Run key to start application
PID:2136

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Public\MbmUP.exe
MD5
31bd0f224e7e74eee2847f43aae23974

SHA1
92e331e1e8ad30538f38dd7ba31386afafa14a58

SHA256
8b0a5fb13309623c3518473551cb1f55d38d8450129d4a3c16b476f7b2867d7d

SHA512
a13f05a12b084ef425f542ff4be824bbccb5dbdfe085af8b7e19d81a6bcba4b8c1debcc38f6b57bc9265a4db21eed70852ece8cc62b3ef14c47fca3035a55249

Download Submit
C:\users\Public\MbmUP.exe
MD5
31bd0f224e7e74eee2847f43aae23974

SHA1
92e331e1e8ad30538f38dd7ba31386afafa14a58

SHA256
8b0a5fb13309623c3518473551cb1f55d38d8450129d4a3c16b476f7b2867d7d

SHA512
a13f05a12b084ef425f542ff4be824bbccb5dbdfe085af8b7e19d81a6bcba4b8c1debcc38f6b57bc9265a4db21eed70852ece8cc62b3ef14c47fca3035a55249

Download Submit
memory/1120-117-0x0000000000000000-mapping.dmp

Download
memory/2136-118-0x0000000000000000-mapping.dmp

Download
memory/2388-119-0x00007FF6E0990000-0x00007FF6E0D1E000-memory.dmp

Filesize
3.6MB

Download
memory/2956-114-0x0000000000000000-mapping.dmp

Download

Resubmissions

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads