ryuk | 23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2

Resubmissions

11-02-2023 10:59

230211-m3msashg63 10

25-08-2021 10:30

210825-65sp376nnx 10

26-07-2021 12:59

210726-91da1g9v7e 10

Analysis

max time kernel
80s
max time network
20s
platform
windows7_x64
resource
win7v20210410
submitted
26-07-2021 12:59

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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 [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
Deletes shadow copies 2 TTPs
Ransomware often targets backup files to inhibit system recovery.
ransomware

File Deletion
T1107

Inhibit System Recovery
T1490

Executes dropped EXE 1 IoCs

pid	Process
1208	LJnIS.exe

Modifies extensions of user files 2 IoCs

Ransomware generally changes the extension on encrypted files.

ransomware

description	ioc	Process
File opened for modification	C:\Users\Admin\Pictures\PushProtect.tiff	taskhost.exe
File opened for modification	C:\Users\Admin\Pictures\PushProtect.tiff	Dwm.exe

Deletes itself 1 IoCs

pid	Process
1208	LJnIS.exe

Loads dropped DLL 1 IoCs

pid	Process
1108	23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2.sample.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run	reg.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Windows\CurrentVersion\Run\svchos = "C:\\users\\Public\\LJnIS.exe"	reg.exe

Enumerates connected drives 3 TTPs 1 IoCs

Attempts to read the root path of hard drives other than the default C: drive.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	\??\D:	vssadmin.exe

Drops file in Program Files directory 64 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\1033\GRAPH_COL.HXT	taskhost.exe
File opened for modification	C:\Program Files\Java\jdk1.7.0_80\lib\visualvm\visualvm\modules\com-sun-tools-visualvm-uisupport.jar	Dwm.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\Groove\ToolIcons\WSS.ICO	Dwm.exe
File opened for modification	C:\Program Files\Java\jdk1.7.0_80\jre\THIRDPARTYLICENSEREADME.txt	taskhost.exe
File opened for modification	C:\Program Files\DVD Maker\Shared\DvdStyles\SpecialOccasion\SpecialNavigationRight_ButtonGraphic.png	Dwm.exe
File opened for modification	C:\Program Files\Java\jdk1.7.0_80\lib\visualvm\platform\lib\org-openide-util.jar	Dwm.exe
File opened for modification	C:\Program Files\Java\jdk1.7.0_80\lib\visualvm\platform\modules\org-netbeans-core-multitabs.jar	Dwm.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\J0152702.WMF	Dwm.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\Groove\ToolData\groove.net\GrooveForms5\FormsColorChart.html	Dwm.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\BD10972_.GIF	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Document Themes 14\Theme Colors\Paper.xml	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\SO02269_.WMF	Dwm.exe
File opened for modification	C:\Program Files (x86)\Common Files\microsoft shared\THEMES14\ICE\ICE.ELM	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Templates\1033\MedianReport.Dotx	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\J0341448.JPG	Dwm.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\mset7es.kic	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\MEDIA\CAGCAT10\J0183290.WMF	taskhost.exe
File opened for modification	C:\Program Files\Java\jdk1.7.0_80\lib\visualvm\visualvm\config\Modules\com-sun-tools-visualvm-core.xml	Dwm.exe
File opened for modification	C:\Program Files\Java\jdk1.7.0_80\lib\missioncontrol\plugins\org.eclipse.ui.themes_1.0.1.v20140819-1717\images\winXPBlue.png	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\J0187893.WMF	Dwm.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\MEDIA\CAGCAT10\J0233018.WMF	taskhost.exe
File opened for modification	C:\Program Files\Java\jre7\lib\zi\Etc\GMT-9	taskhost.exe
File opened for modification	C:\Program Files\Java\jre7\lib\zi\America\Belem	taskhost.exe
File opened for modification	C:\Program Files\VideoLAN\VLC\locale\bn\LC_MESSAGES\RyukReadMe.txt	taskhost.exe
File opened for modification	C:\Program Files\Java\jdk1.7.0_80\lib\missioncontrol\plugins\com.jrockit.mc.browser.attach_5.5.0.165303.jar	Dwm.exe
File opened for modification	C:\Program Files\Java\jre7\lib\zi\America\Danmarkshavn	Dwm.exe
File opened for modification	C:\Program Files (x86)\Adobe\Reader 9.0\Reader\Tracker\submission_history.gif	Dwm.exe
File opened for modification	C:\Program Files (x86)\Microsoft Visual Studio 8\Common7\IDE\VSTA\ItemTemplates\VisualBasic\1033\RyukReadMe.txt	Dwm.exe
File opened for modification	C:\Program Files\DVD Maker\Shared\DvdStyles\BabyGirl\btn-back-static.png	taskhost.exe
File opened for modification	C:\Program Files\Common Files\Microsoft Shared\ink\fsdefinitions\main\base_heb.xml	taskhost.exe
File opened for modification	C:\Program Files\Common Files\Microsoft Shared\ink\fsdefinitions\RyukReadMe.txt	Dwm.exe
File opened for modification	C:\Program Files\Common Files\Microsoft Shared\ink\Alphabet.xml	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\J0177806.JPG	taskhost.exe
File opened for modification	C:\Program Files (x86)\Common Files\microsoft shared\VSTA\Pipeline.v10.0\RyukReadMe.txt	Dwm.exe
File opened for modification	C:\Program Files\Common Files\Microsoft Shared\ink\pl-PL\RyukReadMe.txt	taskhost.exe
File opened for modification	C:\Program Files\Java\jdk1.7.0_80\lib\missioncontrol\features\org.eclipse.babel.nls_eclipse_zh_4.4.0.v20140623020002\RyukReadMe.txt	taskhost.exe
File opened for modification	C:\Program Files\Java\jdk1.7.0_80\db\bin\sysinfo	Dwm.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\MEDIA\OFFICE14\AUTOSHAP\BD18254_.WMF	Dwm.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\1033\POWERPNT.DEV_COL.HXT	Dwm.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Stationery\1033\CURRENCY.GIF	Dwm.exe
File opened for modification	C:\Program Files\DVD Maker\Shared\DvdStyles\Vignette\whiteband.png	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\1033\MSO.ACL	taskhost.exe
File opened for modification	C:\Program Files\Java\jdk1.7.0_80\lib\missioncontrol\plugins\org.eclipse.core.runtime_3.10.0.v20140318-2214.jar	Dwm.exe
File opened for modification	C:\Program Files (x86)\Common Files\microsoft shared\VBA\VBA6\VBE6EXT.OLB	Dwm.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\J0382947.JPG	Dwm.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\PUBWIZ\PICCAP98.POC	Dwm.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\PROOF\MSSP7FR.dub	Dwm.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\J0386270.JPG	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\J0185786.WMF	taskhost.exe
File opened for modification	C:\Program Files\Java\jre7\lib\zi\America\North_Dakota\RyukReadMe.txt	Dwm.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\PE02267_.WMF	Dwm.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\PH01478U.BMP	Dwm.exe
File opened for modification	C:\Program Files\DVD Maker\Shared\DvdStyles\SpecialOccasion\specialmainsubpicture.png	taskhost.exe
File opened for modification	C:\Program Files\DVD Maker\Shared\DvdStyles\LayeredTitles\1047x576black.png	Dwm.exe
File opened for modification	C:\Program Files\Java\jdk1.7.0_80\lib\missioncontrol\plugins\org.eclipse.e4.ui.workbench3_0.12.0.v20140227-2118.jar	Dwm.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\DD01162_.WMF	Dwm.exe
File opened for modification	C:\Program Files\Java\jre7\lib\zi\Atlantic\Canary	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\Groove\ToolData\groove.net\GrooveForms4\FormsFormTemplate.html	taskhost.exe
File opened for modification	C:\Program Files\VideoLAN\VLC\locale\my\RyukReadMe.txt	Dwm.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\ED00184_.WMF	Dwm.exe
File opened for modification	C:\Program Files\Java\jdk1.7.0_80\db\bin\setEmbeddedCP	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\1033\GROOVE_K_COL.HXK	Dwm.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Document Themes 14\Theme Colors\Austin.xml	Dwm.exe
File opened for modification	C:\Program Files\VideoLAN\VLC\lua\modules\sandbox.luac	taskhost.exe

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

System Information Discovery
T1082

Interacts with shadow copies 2 TTPs 6 IoCs

Shadow copies are often targeted by ransomware to inhibit system recovery.

ransomware

File Deletion

T1107

Inhibit System Recovery

T1490

pid	Process
34196	vssadmin.exe
69896	vssadmin.exe
69392	vssadmin.exe
69348	vssadmin.exe
69300	vssadmin.exe
69220	vssadmin.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
1208	LJnIS.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	1208	LJnIS.exe
Token: SeBackupPrivilege	69924	vssvc.exe
Token: SeRestorePrivilege	69924	vssvc.exe
Token: SeAuditPrivilege	69924	vssvc.exe

Suspicious use of UnmapMainImage 2 IoCs

pid	Process
1128	taskhost.exe
1188	Dwm.exe

Suspicious use of WriteProcessMemory 36 IoCs

description	pid	Process	procid_target
PID 1108 wrote to memory of 1208	1108	23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2.sample.exe	26
PID 1108 wrote to memory of 1208	1108	23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2.sample.exe	26
PID 1108 wrote to memory of 1208	1108	23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2.sample.exe	26
PID 1108 wrote to memory of 1208	1108	23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2.sample.exe	26
PID 1208 wrote to memory of 1616	1208	LJnIS.exe	30
PID 1208 wrote to memory of 1616	1208	LJnIS.exe	30
PID 1208 wrote to memory of 1616	1208	LJnIS.exe	30
PID 1208 wrote to memory of 1128	1208	LJnIS.exe	11
PID 1616 wrote to memory of 1636	1616	cmd.exe	32
PID 1616 wrote to memory of 1636	1616	cmd.exe	32
PID 1616 wrote to memory of 1636	1616	cmd.exe	32
PID 1208 wrote to memory of 1188	1208	LJnIS.exe	15
PID 1128 wrote to memory of 69860	1128	taskhost.exe	34
PID 1128 wrote to memory of 69860	1128	taskhost.exe	34
PID 1128 wrote to memory of 69860	1128	taskhost.exe	34
PID 69860 wrote to memory of 69896	69860	cmd.exe	36
PID 69860 wrote to memory of 69896	69860	cmd.exe	36
PID 69860 wrote to memory of 69896	69860	cmd.exe	36
PID 1188 wrote to memory of 69448	1188	Dwm.exe	41
PID 1188 wrote to memory of 69448	1188	Dwm.exe	41
PID 1188 wrote to memory of 69448	1188	Dwm.exe	41
PID 69448 wrote to memory of 69392	69448	cmd.exe	43
PID 69448 wrote to memory of 69392	69448	cmd.exe	43
PID 69448 wrote to memory of 69392	69448	cmd.exe	43
PID 69448 wrote to memory of 69348	69448	cmd.exe	44
PID 69448 wrote to memory of 69348	69448	cmd.exe	44
PID 69448 wrote to memory of 69348	69448	cmd.exe	44
PID 69448 wrote to memory of 69300	69448	cmd.exe	47
PID 69448 wrote to memory of 69300	69448	cmd.exe	47
PID 69448 wrote to memory of 69300	69448	cmd.exe	47
PID 69448 wrote to memory of 69220	69448	cmd.exe	48
PID 69448 wrote to memory of 69220	69448	cmd.exe	48
PID 69448 wrote to memory of 69220	69448	cmd.exe	48
PID 69448 wrote to memory of 34196	69448	cmd.exe	49
PID 69448 wrote to memory of 34196	69448	cmd.exe	49
PID 69448 wrote to memory of 34196	69448	cmd.exe	49

C:\Windows\system32\taskhost.exe
"taskhost.exe"
1⤵
- Modifies extensions of user files
- Drops file in Program Files directory
- Suspicious use of UnmapMainImage
- Suspicious use of WriteProcessMemory
PID:1128
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\users\Public\window.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:69860
- - C:\Windows\system32\vssadmin.exe
    vssadmin Delete Shadows /all /quiet
    3⤵
    - Interacts with shadow copies
    PID:69896

C:\Windows\system32\Dwm.exe
"C:\Windows\system32\Dwm.exe"
1⤵
- Modifies extensions of user files
- Drops file in Program Files directory
- Suspicious use of UnmapMainImage
- Suspicious use of WriteProcessMemory
PID:1188
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\users\Public\window.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:69448
- - C:\Windows\system32\vssadmin.exe
    vssadmin Delete Shadows /all /quiet
    3⤵
    - Interacts with shadow copies
    PID:69392
- - C:\Windows\system32\vssadmin.exe
    vssadmin resize shadowstorage /for=c: /on=c: /maxsize=401MB
    3⤵
    - Interacts with shadow copies
    PID:69348
- - C:\Windows\system32\vssadmin.exe
    vssadmin resize shadowstorage /for=c: /on=c: /maxsize=unbounded
    3⤵
    - Interacts with shadow copies
    PID:69300
- - C:\Windows\system32\vssadmin.exe
    vssadmin resize shadowstorage /for=d: /on=d: /maxsize=401MB
    3⤵
    - Enumerates connected drives
    - Interacts with shadow copies
    PID:69220
- - C:\Windows\system32\vssadmin.exe
    vssadmin resize shadowstorage /for=d: /on=d: /maxsize=unbounded
    3⤵
    - Interacts with shadow copies
    PID:34196

C:\Users\Admin\AppData\Local\Temp\23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2.sample.exe
"C:\Users\Admin\AppData\Local\Temp\23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2.sample.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:1108
- C:\users\Public\LJnIS.exe
  "C:\users\Public\LJnIS.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:1208
- - 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\LJnIS.exe" /f
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1616
  - - C:\Windows\system32\reg.exe
      REG ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "svchos" /t REG_SZ /d "C:\users\Public\LJnIS.exe" /f
      4⤵
      Adds Run key to start application
      PID:1636

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:69924

C:\Windows\system32\Dwm.exe
"C:\Windows\system32\Dwm.exe"
1⤵
PID:69324

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

File Deletion

T1107

Modify Registry

T1112

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Inhibit System Recovery

T1490

Replay Monitor

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Downloads

memory/1108-60-0x0000000076E11000-0x0000000076E13000-memory.dmp

Filesize
8KB

Download
memory/1128-67-0x000000013FD30000-0x00000001400BE000-memory.dmp

Filesize
3.6MB

Download
memory/1208-64-0x000007FEFC4D1000-0x000007FEFC4D3000-memory.dmp

Filesize
8KB

Download