ryuk | 8b0a5fb13309623c3518473551cb1f55d38d8450129d4a3c16b476f7b2867d7d

Resubmissions

31-07-2023 12:37

230731-ptx8safd79 10

31-07-2023 12:37

230731-ptndksfd76 7

31-07-2023 11:43

230731-nvq1eseh69 10

Analysis

max time kernel
68s
max time network
18s
platform
windows7_x64
resource
win7-20230712-en
resource tags

arch:x64arch:x86image:win7-20230712-enlocale:en-usos:windows7-x64system
submitted
31-07-2023 11:43

Sharing

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Report Analysis Logs

General

Target

yOMHr.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

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

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

reg.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-1014134971-2480516131-292343513-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run	reg.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1014134971-2480516131-292343513-1000\Software\Microsoft\Windows\CurrentVersion\Run\svchos = "C:\\Users\\Admin\\AppData\\Local\\Temp\\yOMHr.exe"	reg.exe

Drops file in Program Files directory 64 IoCs

Processes:

taskhost.exe

description	ioc	process
File opened for modification	C:\Program Files\DVD Maker\Shared\DvdStyles\Sports\GoldRing.png	taskhost.exe
File opened for modification	C:\Program Files\Common Files\Microsoft Shared\ink\fsdefinitions\osknumpad\RyukReadMe.txt	taskhost.exe
File opened for modification	C:\Program Files\Common Files\System\ado\msadox28.tlb	taskhost.exe
File opened for modification	C:\Program Files\DVD Maker\Shared\DvdStyles\Performance\ParentMenuButtonIconSubpict.png	taskhost.exe
File opened for modification	C:\Program Files\DVD Maker\Shared\DvdStyles\Pets\Pets_image-frame-ImageMask.png	taskhost.exe
File opened for modification	C:\Program Files\DVD Maker\Shared\DvdStyles\SpecialOccasion\NavigationLeft_SelectionSubpicture.png	taskhost.exe
File opened for modification	C:\Program Files\DVD Maker\Shared\DvdStyles\SpecialOccasion\whitemask1047.png	taskhost.exe
File opened for modification	C:\Program Files\Common Files\RyukReadMe.txt	taskhost.exe
File opened for modification	C:\Program Files\Common Files\Microsoft Shared\ink\hwresslm.dat	taskhost.exe
File opened for modification	C:\Program Files\Common Files\Microsoft Shared\ink\nl-NL\RyukReadMe.txt	taskhost.exe
File opened for modification	C:\Program Files\DVD Maker\Shared\DvdStyles\Performance\userContent_16x9_imagemask.png	taskhost.exe
File opened for modification	C:\Program Files\DVD Maker\Shared\DvdStyles\Pets\Scenes_LOOP_BG.wmv	taskhost.exe
File opened for modification	C:\Program Files\DVD Maker\Shared\DvdStyles\Pets\Pets_frame-shadow.png	taskhost.exe
File opened for modification	C:\Program Files\DVD Maker\Shared\DvdStyles\SpecialOccasion\SpecialNavigationRight_SelectionSubpicture.png	taskhost.exe
File opened for modification	C:\Program Files\DVD Maker\Shared\DvdStyles\Sports\SportsNotesBackground_PAL.wmv	taskhost.exe
File opened for modification	C:\Program Files\7-Zip\7zCon.sfx	taskhost.exe
File opened for modification	C:\Program Files\7-Zip\History.txt	taskhost.exe
File opened for modification	C:\Program Files\Common Files\System\Ole DB\en-US\RyukReadMe.txt	taskhost.exe
File opened for modification	C:\Program Files\DVD Maker\Shared\DvdStyles\BabyBoy\BabyBoyMainBackground_PAL.wmv	taskhost.exe
File opened for modification	C:\Program Files\DVD Maker\Shared\DvdStyles\Performance\Title_Trans_Scene_PAL.wmv	taskhost.exe
File opened for modification	C:\Program Files\DVD Maker\Shared\DvdStyles\Push\NavigationUp_ButtonGraphic.png	taskhost.exe
File opened for modification	C:\Program Files\DVD Maker\Shared\DvdStyles\rectangle_travel_Thumbnail.bmp	taskhost.exe
File opened for modification	C:\Program Files\DVD Maker\Shared\DvdStyles\SpecialOccasion\SpecialNavigationLeft_SelectionSubpicture.png	taskhost.exe
File opened for modification	C:\Program Files\7-Zip\Lang\nl.txt	taskhost.exe
File opened for modification	C:\Program Files\Common Files\Microsoft Shared\ink\fsdefinitions\symbols\symbase.xml	taskhost.exe
File opened for modification	C:\Program Files\Common Files\Microsoft Shared\Stationery\RyukReadMe.txt	taskhost.exe
File opened for modification	C:\Program Files\DVD Maker\bod_r.TTF	taskhost.exe
File opened for modification	C:\Program Files\DVD Maker\Shared\DvdStyles\16to9Squareframe_VideoInset.png	taskhost.exe
File opened for modification	C:\Program Files\Common Files\Microsoft Shared\Stationery\Roses.jpg	taskhost.exe
File opened for modification	C:\Program Files\DVD Maker\Shared\DvdStyles\4to3Squareframe_SelectionSubpicture.png	taskhost.exe
File opened for modification	C:\Program Files\DVD Maker\Shared\DvdStyles\LayeredTitles\NavigationRight_SelectionSubpicture.png	taskhost.exe
File opened for modification	C:\Program Files\DVD Maker\Shared\DvdStyles\Full\NavigationUp_ButtonGraphic.png	taskhost.exe
File opened for modification	C:\Program Files\DVD Maker\Shared\DvdStyles\Pets\Pets_btn-back-over-select.png	taskhost.exe
File opened for modification	C:\Program Files\Common Files\Microsoft Shared\ink\HWRCustomization\RyukReadMe.txt	taskhost.exe
File opened for modification	C:\Program Files\Common Files\Microsoft Shared\ink\ipskor.xml	taskhost.exe
File opened for modification	C:\Program Files\Common Files\Microsoft Shared\VSTO\10.0\VSTOInstaller.config	taskhost.exe
File opened for modification	C:\Program Files\Common Files\System\msadc\handsafe.reg	taskhost.exe
File opened for modification	C:\Program Files\DVD Maker\Shared\RyukReadMe.txt	taskhost.exe
File opened for modification	C:\Program Files\DVD Maker\Shared\DvdStyles\SpecialOccasion\NavigationLeft_ButtonGraphic.png	taskhost.exe
File opened for modification	C:\Program Files\Common Files\Microsoft Shared\ink\hwresmlm.dat	taskhost.exe
File opened for modification	C:\Program Files\Common Files\Microsoft Shared\OfficeSoftwareProtectionPlatform\osppobjs-spp-plugin-manifest-signed.xrm-ms	taskhost.exe
File opened for modification	C:\Program Files\Common Files\System\Ole DB\oledbjvs.inc	taskhost.exe
File opened for modification	C:\Program Files\DVD Maker\Shared\DvdStyles\Performance\Notes_loop_PAL.wmv	taskhost.exe
File opened for modification	C:\Program Files\DVD Maker\Shared\DvdStyles\Postage_VideoInset.png	taskhost.exe
File opened for modification	C:\Program Files\Common Files\Microsoft Shared\Stationery\Soft Blue.htm	taskhost.exe
File opened for modification	C:\Program Files\Common Files\Microsoft Shared\Stationery\SoftBlue.jpg	taskhost.exe
File opened for modification	C:\Program Files\DVD Maker\rtstreamsink.ax	taskhost.exe
File opened for modification	C:\Program Files\DVD Maker\Shared\DvdStyles\BabyGirl\chapters-static.png	taskhost.exe
File opened for modification	C:\Program Files\DVD Maker\Shared\DvdStyles\Rectangles\NavigationRight_SelectionSubpicture.png	taskhost.exe
File opened for modification	C:\Program Files\Common Files\System\Ole DB\fr-FR\RyukReadMe.txt	taskhost.exe
File opened for modification	C:\Program Files\DVD Maker\Shared\DvdStyles\Pets\Pets_btn-previous-over-select.png	taskhost.exe
File opened for modification	C:\Program Files\DVD Maker\Shared\DvdStyles\Shatter\203x8subpicture.png	taskhost.exe
File opened for modification	C:\Program Files\Common Files\Microsoft Shared\ink\fsdefinitions\main.xml	taskhost.exe
File opened for modification	C:\Program Files\Common Files\Microsoft Shared\ink\hwrcommonlm.dat	taskhost.exe
File opened for modification	C:\Program Files\Common Files\Microsoft Shared\ink\ipsrus.xml	taskhost.exe
File opened for modification	C:\Program Files\DVD Maker\Shared\DvdStyles\NavigationUp_SelectionSubpicture.png	taskhost.exe
File opened for modification	C:\Program Files\DVD Maker\Shared\DvdStyles\shadowonlyframe_buttongraphic.png	taskhost.exe
File opened for modification	C:\Program Files\7-Zip\Lang\br.txt	taskhost.exe
File opened for modification	C:\Program Files\Common Files\Microsoft Shared\ink\fsdefinitions\symbols.xml	taskhost.exe
File opened for modification	C:\Program Files\Common Files\SpeechEngines\Microsoft\TTS20\en-US\RyukReadMe.txt	taskhost.exe
File opened for modification	C:\Program Files\DVD Maker\Shared\DvdStyles\BlackRectangle.bmp	taskhost.exe
File opened for modification	C:\Program Files\DVD Maker\offset.ax	taskhost.exe
File opened for modification	C:\Program Files\DVD Maker\Shared\DvdStyles\FlipPage\NavigationUp_SelectionSubpicture.png	taskhost.exe
File opened for modification	C:\Program Files\DVD Maker\Shared\DvdStyles\rectangle_performance_Thumbnail.bmp	taskhost.exe

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

System Information Discovery
T1082
Suspicious behavior: EnumeratesProcesses 1 IoCs

Processes:

yOMHr.exe

pid process

2544 yOMHr.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

yOMHr.exe

description pid process

Token: SeDebugPrivilege 2544 yOMHr.exe

pid	process
2544	yOMHr.exe

description	pid	process
Token: SeDebugPrivilege	2544	yOMHr.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

yOMHr.execmd.exe

description	pid	process	target process
PID 2544 wrote to memory of 1612	2544	yOMHr.exe	cmd.exe
PID 2544 wrote to memory of 1612	2544	yOMHr.exe	cmd.exe
PID 2544 wrote to memory of 1612	2544	yOMHr.exe	cmd.exe
PID 2544 wrote to memory of 1116	2544	yOMHr.exe	taskhost.exe
PID 2544 wrote to memory of 1160	2544	yOMHr.exe	Dwm.exe
PID 1612 wrote to memory of 2024	1612	cmd.exe	reg.exe
PID 1612 wrote to memory of 2024	1612	cmd.exe	reg.exe
PID 1612 wrote to memory of 2024	1612	cmd.exe	reg.exe

C:\Windows\system32\taskhost.exe
"taskhost.exe"
1⤵
- Drops file in Program Files directory
PID:1116

C:\Windows\system32\Dwm.exe
"C:\Windows\system32\Dwm.exe"
1⤵
PID:1160

C:\Users\Admin\AppData\Local\Temp\yOMHr.exe
"C:\Users\Admin\AppData\Local\Temp\yOMHr.exe"
1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2544

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\yOMHr.exe" /f
2⤵
- Suspicious use of WriteProcessMemory
PID:1612

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\yOMHr.exe" /f
3⤵
- Adds Run key to start application
PID:2024

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

C:\RyukReadMe.txt

Filesize
804B

MD5
cd99cba6153cbc0b14b7a849e4d0180f

SHA1
375961866404a705916cbc6cd4915de7d9778923

SHA256
74c43a177917b1d57ea2eaf6212ccf3b9012b4d68bc45284349443eed0bf5ee2

SHA512
0c9f250c0e2ec9736b072a9807b6c3bec4b670ab2f511e65cf5d79e9a8c9a209eb91736ce2765b52b6d94a57c6aa1c16bb08e16727660699b70608439c8b7cda

Download Submit
memory/1116-117-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-70-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-55-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-53-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-73-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-71-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-77-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-76-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-79-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-82-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-113-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-84-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-127-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-92-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-95-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-98-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-99-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-104-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-107-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-110-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-88-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-56-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-86-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-134-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-130-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-129-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-126-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-123-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-120-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-115-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-167-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-141-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-142-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-143-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-145-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-148-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-151-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-154-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-155-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-156-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-161-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-158-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1116-169-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download
memory/1160-137-0x000000013F9E0000-0x000000013FD6E000-memory.dmp

Filesize
3.6MB

Download