ryuk | 8b0a5fb13309623c3518473551cb1f55d38d8450129d4a3c16b476f7b2867d7d

Analysis

max time kernel
150s
max time network
148s
platform
windows10-1703_x64
resource
win10-20240221-en
resource tags

arch:x64arch:x86image:win10-20240221-enlocale:en-usos:windows10-1703-x64system
submitted
06-03-2024 13:31

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General

Target

UvPSn.exe
Size

170KB
MD5

31bd0f224e7e74eee2847f43aae23974
SHA1

92e331e1e8ad30538f38dd7ba31386afafa14a58
SHA256

8b0a5fb13309623c3518473551cb1f55d38d8450129d4a3c16b476f7b2867d7d
SHA512

a13f05a12b084ef425f542ff4be824bbccb5dbdfe085af8b7e19d81a6bcba4b8c1debcc38f6b57bc9265a4db21eed70852ece8cc62b3ef14c47fca3035a55249
SSDEEP

3072:2qeriftL/WSo1vDb53j/8WGUzaqVh4LI8zQpn:2trA/WSo1rl3ALrlHQpn

Score

10^/10

ryuk persistence ransomware

Malware Config

Extracted

Path

F:\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 [email protected] or [email protected] BTC wallet: 14hVKm7Ft2rxDBFTNkkRC3kGstMGp2A4hk Ryuk No system is safe

Emails

[email protected]

Wallets

14hVKm7Ft2rxDBFTNkkRC3kGstMGp2A4hk

Signatures

Ryuk
Ransomware distributed via existing botnets, often Trickbot or Emotet.
ransomware ryuk

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3360119756-166634443-3920521668-1000\Software\Microsoft\Windows\CurrentVersion\Run\svchos = "C:\\Users\\Admin\\AppData\\Local\\Temp\\UvPSn.exe"	reg.exe

Drops file in Program Files directory 64 IoCs

description	ioc	Process
File opened for modification	C:\Program Files\Common Files\microsoft shared\ink\ipsen.xml	sihost.exe
File opened for modification	C:\Program Files\Java\jdk-1.8\jre\legal\jdk\icu.md	sihost.exe
File opened for modification	C:\Program Files\Java\jdk-1.8\jre\lib\security\policy\unlimited\local_policy.jar	sihost.exe
File opened for modification	C:\Program Files\Common Files\System\Ole DB\RyukReadMe.txt	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\PowerPoint2019R_Trial-pl.xrm-ms	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\PublisherR_Trial-ppd.xrm-ms	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\StandardR_Trial-ppd.xrm-ms	sihost.exe
File opened for modification	C:\Program Files\Common Files\microsoft shared\ink\fsdefinitions\keypad\ea.xml	sihost.exe
File opened for modification	C:\Program Files\Java\jdk-1.8\jre\legal\jdk\joni.md	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\Excel2019VL_KMS_Client_AE-ul-oob.xrm-ms	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\HomeBusiness2019R_OEM_Perp2-ul-oob.xrm-ms	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\ProjectProR_Trial-ul-oob.xrm-ms	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Office16\1033\ClientSub2019_eula.txt	sihost.exe
File opened for modification	C:\Program Files\Common Files\System\Ole DB\es-ES\RyukReadMe.txt	sihost.exe
File opened for modification	C:\Program Files\Java\jdk-1.8\jre\lib\ext\sunpkcs11.jar	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Integration\C2RManifest.office32mui.msi.16.en-us.xml	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\OneNoteVL_MAK-ul-oob.xrm-ms	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\OutlookR_Retail-ppd.xrm-ms	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Office16\1033\QuickStyles\basicstylish.dotx	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\WordVL_KMS_Client-ppd.xrm-ms	sihost.exe
File opened for modification	C:\Program Files\Common Files\microsoft shared\ClickToRun\i640.cab.cat	sihost.exe
File opened for modification	C:\Program Files\Common Files\microsoft shared\ink\fsdefinitions\osknav.xml	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Integration\C2RManifest.officemui.msi.16.en-us.xml	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\HomeBusiness2019R_Retail-ul-phn.xrm-ms	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\ProjectPro2019R_PrepidBypass-ppd.xrm-ms	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\StandardVL_KMS_Client-ppd.xrm-ms	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\VisioProMSDNR_Retail-ul-oob.xrm-ms	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Document Themes 16\Theme Effects\Reflection.eftx	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\O365ProPlusR_Subscription2-ppd.xrm-ms	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Office16\1033\PROTTPLV.XLS	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\VisioStdO365R_SubTrial-pl.xrm-ms	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\ProjectProR_Retail2-ul-oob.xrm-ms	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\ProPlus2019R_OEM_Perp-pl.xrm-ms	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\ProPlus2019XC2RVL_MAKC2R-ul-oob.xrm-ms	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\VisioProXC2RVL_MAKC2R-ul-phn.xrm-ms	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\VisioStd2019R_OEM_Perp-ppd.xrm-ms	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\VisioStdCO365R_SubTest-pl.xrm-ms	sihost.exe
File opened for modification	C:\Program Files\7-Zip\Lang\ky.txt	sihost.exe
File opened for modification	C:\Program Files\Java\jdk-1.8\jre\lib\javafx.properties	sihost.exe
File opened for modification	C:\Program Files\Java\jre-1.8\lib\ext\meta-index	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\PackageManifests\AppXManifest.common.16.xml	sihost.exe
File opened for modification	C:\Program Files\Common Files\microsoft shared\ink\ipscht.xml	sihost.exe
File opened for modification	C:\Program Files\Java\jre-1.8\lib\deploy\messages_zh_TW.properties	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Document Themes 16\Theme Colors\Paper.xml	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\HomeBusiness2019R_Retail-pl.xrm-ms	sihost.exe
File opened for modification	C:\Program Files\Java\jre-1.8\lib\management\jmxremote.access	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\OneNoteR_Retail-ul-oob.xrm-ms	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\Professional2019R_PrepidBypass-ul-oob.xrm-ms	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\ProPlus2019R_OEM_Perp-ul-phn.xrm-ms	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\VisioStdO365R_Subscription-pl.xrm-ms	sihost.exe
File opened for modification	C:\Program Files\7-Zip\Lang\lij.txt	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\Standard2019VL_MAK_AE-ppd.xrm-ms	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\VisioProCO365R_SubTrial-pl.xrm-ms	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Office16\1033\TellMePowerPoint.nrr	sihost.exe
File opened for modification	C:\Program Files\Java\jdk-1.8\legal\javafx\libxslt.md	sihost.exe
File opened for modification	C:\Program Files\Java\jre-1.8\legal\jdk\zlib.md	sihost.exe
File opened for modification	C:\Program Files\Java\jre-1.8\Welcome.html	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\HomeStudent2019R_OEM_Perp-ul-oob.xrm-ms	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\O365SmallBusPremR_SubTrial1-pl.xrm-ms	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\ProjectStdVL_MAK-ul-phn.xrm-ms	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\HomeBusinessR_Retail2-pl.xrm-ms	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Licenses16\ProjectPro2019R_Retail-pl.xrm-ms	sihost.exe
File opened for modification	C:\Program Files\Microsoft Office\root\Office16\1033\SkypeForBusinessVDI2019_eula.txt	sihost.exe
File opened for modification	C:\Program Files\7-Zip\Lang\sr-spc.txt	sihost.exe

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2088	UvPSn.exe
2088	UvPSn.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2088	UvPSn.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 2088 wrote to memory of 2080	2088	UvPSn.exe	73
PID 2088 wrote to memory of 2080	2088	UvPSn.exe	73
PID 2088 wrote to memory of 2844	2088	UvPSn.exe	49
PID 2088 wrote to memory of 2864	2088	UvPSn.exe	50
PID 2080 wrote to memory of 2224	2080	cmd.exe	75
PID 2080 wrote to memory of 2224	2080	cmd.exe	75
PID 2088 wrote to memory of 3084	2088	UvPSn.exe	52
PID 2088 wrote to memory of 3680	2088	UvPSn.exe	55
PID 2088 wrote to memory of 3688	2088	UvPSn.exe	56
PID 2088 wrote to memory of 3892	2088	UvPSn.exe	57
PID 2088 wrote to memory of 4140	2088	UvPSn.exe	58
PID 2088 wrote to memory of 328	2088	UvPSn.exe	67
PID 2088 wrote to memory of 4716	2088	UvPSn.exe	68
PID 2088 wrote to memory of 4352	2088	UvPSn.exe	69

c:\windows\system32\sihost.exe
sihost.exe
1⤵
- Drops file in Program Files directory
PID:2844

c:\windows\system32\svchost.exe
c:\windows\system32\svchost.exe -k unistacksvcgroup -s CDPUserSvc
1⤵
PID:2864

c:\windows\system32\taskhostw.exe
taskhostw.exe {222A245B-E637-4AE9-A93F-A59CA119A75E}
1⤵
PID:3084

C:\Windows\SystemApps\ShellExperienceHost_cw5n1h2txyewy\ShellExperienceHost.exe
"C:\Windows\SystemApps\ShellExperienceHost_cw5n1h2txyewy\ShellExperienceHost.exe" -ServerName:App.AppXtk181tbxbce2qsex02s8tw7hfxa9xb3t.mca
1⤵
PID:3680

C:\Windows\SystemApps\Microsoft.Windows.Cortana_cw5n1h2txyewy\SearchUI.exe
"C:\Windows\SystemApps\Microsoft.Windows.Cortana_cw5n1h2txyewy\SearchUI.exe" -ServerName:CortanaUI.AppXa50dqqa5gqv4a428c9y1jjw7m3btvepj.mca
1⤵
PID:3688

C:\Windows\System32\RuntimeBroker.exe
C:\Windows\System32\RuntimeBroker.exe -Embedding
1⤵
PID:3892

C:\Windows\system32\DllHost.exe
C:\Windows\system32\DllHost.exe /Processid:{3EB3C877-1F16-487C-9050-104DBCD66683}
1⤵
PID:4140

C:\Windows\system32\ApplicationFrameHost.exe
C:\Windows\system32\ApplicationFrameHost.exe -Embedding
1⤵
PID:328

C:\Windows\System32\InstallAgent.exe
C:\Windows\System32\InstallAgent.exe -Embedding
1⤵
PID:4716

C:\Windows\system32\DllHost.exe
C:\Windows\system32\DllHost.exe /Processid:{973D20D7-562D-44B9-B70B-5A0F49CCDF3F}
1⤵
PID:4352

C:\Users\Admin\AppData\Local\Temp\UvPSn.exe
"C:\Users\Admin\AppData\Local\Temp\UvPSn.exe"
1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2088
- 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\UvPSn.exe" /f
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2080
- - 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\UvPSn.exe" /f
    3⤵
    - Adds Run key to start application
    PID:2224

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

F:\RyukReadMe.txt

Filesize
804B

MD5
cd99cba6153cbc0b14b7a849e4d0180f

SHA1
375961866404a705916cbc6cd4915de7d9778923

SHA256
74c43a177917b1d57ea2eaf6212ccf3b9012b4d68bc45284349443eed0bf5ee2

SHA512
0c9f250c0e2ec9736b072a9807b6c3bec4b670ab2f511e65cf5d79e9a8c9a209eb91736ce2765b52b6d94a57c6aa1c16bb08e16727660699b70608439c8b7cda

Download Submit
memory/2844-56-0x00007FF6FFBA0000-0x00007FF6FFF2E000-memory.dmp

Filesize
3.6MB

Download
memory/2844-1597-0x00007FF6FFBA0000-0x00007FF6FFF2E000-memory.dmp

Filesize
3.6MB

Download
memory/2844-20-0x00007FF6FFBA0000-0x00007FF6FFF2E000-memory.dmp

Filesize
3.6MB

Download
memory/2844-24-0x00007FF6FFBA0000-0x00007FF6FFF2E000-memory.dmp

Filesize
3.6MB

Download
memory/2844-22-0x00007FF6FFBA0000-0x00007FF6FFF2E000-memory.dmp

Filesize
3.6MB

Download
memory/2844-30-0x00007FF6FFBA0000-0x00007FF6FFF2E000-memory.dmp

Filesize
3.6MB

Download
memory/2844-33-0x00007FF6FFBA0000-0x00007FF6FFF2E000-memory.dmp

Filesize
3.6MB

Download
memory/2844-29-0x00007FF6FFBA0000-0x00007FF6FFF2E000-memory.dmp

Filesize
3.6MB

Download
memory/2844-58-0x00007FF6FFBA0000-0x00007FF6FFF2E000-memory.dmp

Filesize
3.6MB

Download
memory/2844-39-0x00007FF6FFBA0000-0x00007FF6FFF2E000-memory.dmp

Filesize
3.6MB

Download
memory/2844-40-0x00007FF6FFBA0000-0x00007FF6FFF2E000-memory.dmp

Filesize
3.6MB

Download
memory/2844-42-0x00007FF6FFBA0000-0x00007FF6FFF2E000-memory.dmp

Filesize
3.6MB

Download
memory/2844-46-0x00007FF6FFBA0000-0x00007FF6FFF2E000-memory.dmp

Filesize
3.6MB

Download
memory/2844-47-0x00007FF6FFBA0000-0x00007FF6FFF2E000-memory.dmp

Filesize
3.6MB

Download
memory/2844-49-0x00007FF6FFBA0000-0x00007FF6FFF2E000-memory.dmp

Filesize
3.6MB

Download
memory/2844-50-0x00007FF6FFBA0000-0x00007FF6FFF2E000-memory.dmp

Filesize
3.6MB

Download
memory/2844-55-0x00007FF6FFBA0000-0x00007FF6FFF2E000-memory.dmp

Filesize
3.6MB

Download
memory/2844-0-0x00007FF6FFBA0000-0x00007FF6FFF2E000-memory.dmp

Filesize
3.6MB

Download
memory/2844-37-0x00007FF6FFBA0000-0x00007FF6FFF2E000-memory.dmp

Filesize
3.6MB

Download
memory/2844-1-0x00007FF6FFBA0000-0x00007FF6FFF2E000-memory.dmp

Filesize
3.6MB

Download
memory/2844-76-0x00007FF6FFBA0000-0x00007FF6FFF2E000-memory.dmp

Filesize
3.6MB

Download
memory/2844-68-0x00007FF6FFBA0000-0x00007FF6FFF2E000-memory.dmp

Filesize
3.6MB

Download
memory/2844-71-0x00007FF6FFBA0000-0x00007FF6FFF2E000-memory.dmp

Filesize
3.6MB

Download
memory/2844-70-0x00007FF6FFBA0000-0x00007FF6FFF2E000-memory.dmp

Filesize
3.6MB

Download
memory/2844-74-0x00007FF6FFBA0000-0x00007FF6FFF2E000-memory.dmp

Filesize
3.6MB

Download
memory/2844-64-0x00007FF6FFBA0000-0x00007FF6FFF2E000-memory.dmp

Filesize
3.6MB

Download
memory/2844-79-0x00007FF6FFBA0000-0x00007FF6FFF2E000-memory.dmp

Filesize
3.6MB

Download
memory/2844-82-0x00007FF6FFBA0000-0x00007FF6FFF2E000-memory.dmp

Filesize
3.6MB

Download
memory/2844-85-0x00007FF6FFBA0000-0x00007FF6FFF2E000-memory.dmp

Filesize
3.6MB

Download
memory/2844-91-0x00007FF6FFBA0000-0x00007FF6FFF2E000-memory.dmp

Filesize
3.6MB

Download
memory/2844-94-0x00007FF6FFBA0000-0x00007FF6FFF2E000-memory.dmp

Filesize
3.6MB

Download
memory/2844-88-0x00007FF6FFBA0000-0x00007FF6FFF2E000-memory.dmp

Filesize
3.6MB

Download
memory/2844-95-0x00007FF6FFBA0000-0x00007FF6FFF2E000-memory.dmp

Filesize
3.6MB

Download
memory/2844-100-0x00007FF6FFBA0000-0x00007FF6FFF2E000-memory.dmp

Filesize
3.6MB

Download
memory/2844-97-0x00007FF6FFBA0000-0x00007FF6FFF2E000-memory.dmp

Filesize
3.6MB

Download
memory/2844-103-0x00007FF6FFBA0000-0x00007FF6FFF2E000-memory.dmp

Filesize
3.6MB

Download
memory/2844-61-0x00007FF6FFBA0000-0x00007FF6FFF2E000-memory.dmp

Filesize
3.6MB

Download
memory/2864-2015-0x00007FF6FFBA0000-0x00007FF6FFF2E000-memory.dmp

Filesize
3.6MB

Download