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
51s
max time network
45s
platform
windows7_x64
resource
win7-20220812-en
resource tags

arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
submitted
11-02-2023 10:59

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General

Target

23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2.exe
Size

384KB
MD5

5ac0f050f93f86e69026faea1fbb4450
SHA1

9709774fde9ec740ad6fed8ed79903296ca9d571
SHA256

23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2
SHA512

b554487c4e26a85ec5179cdcc1d25b5bc494e8821a8899fbbf868c3cf41f70cc72db107613b3f6655d3ab70f4db94cce2589066bb354b1ed955098d3911b844d
SSDEEP

6144:f5yaXtrA/WSo1rl3ALrlHQpn0BwK3SBDmhYfFQC:fTX6WSofcZ+KCIGD

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

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\ConfirmCompress.tiff	taskhost.exe
File opened for modification	C:\Users\Admin\Pictures\NewSuspend.tiff	taskhost.exe

Deletes itself 1 IoCs

pid	Process
1656	PQveL.exe

Executes dropped EXE 1 IoCs

pid	Process
1656	PQveL.exe

Loads dropped DLL 1 IoCs

pid	Process
1916	23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2.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-1-5-21-2292972927-2705560509-2768824231-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run	reg.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Windows\CurrentVersion\Run\svchos = "C:\\users\\Public\\PQveL.exe"	reg.exe

Drops file in Program Files directory 64 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\J0105286.WMF	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\NA00462_.WMF	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\Groove\ToolData\groove.net\GrooveForms\viewDblClick.js	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\Groove\ToolData\groove.net\GrooveForms4\bg_FormsHomePageBlank.gif	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\OLKIRM.XML	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\PUBWIZ\SIDBAR98.POC	taskhost.exe
File opened for modification	C:\Program Files\Java\jdk1.7.0_80\jre\lib\zi\Pacific\Kosrae	taskhost.exe
File opened for modification	C:\Program Files\Java\jre7\lib\zi\America\Miquelon	taskhost.exe
File opened for modification	C:\Program Files (x86)\Common Files\microsoft shared\VBA\VBA6\RyukReadMe.txt	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\FD00086_.WMF	taskhost.exe
File opened for modification	C:\Program Files (x86)\Adobe\Reader 9.0\Resource\TypeSupport\Unicode\Mappings\Adobe\zdingbat.txt	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\MEDIA\OFFICE14\BULLETS\BD14980_.GIF	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\1033\PUBSPAPR\ZPDIR1F.GIF	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\1033\PUBSPAPR\ZPDIR21F.GIF	taskhost.exe
File opened for modification	C:\Program Files\Common Files\Microsoft Shared\ink\ipsnld.xml	taskhost.exe
File opened for modification	C:\Program Files\VideoLAN\VLC\lua\http\requests\vlm_cmd.xml	taskhost.exe
File opened for modification	C:\Program Files (x86)\Adobe\Reader 9.0\Reader\RyukReadMe.txt	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\MEDIA\CAGCAT10\J0284916.JPG	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\Groove\ToolData\groove.net\GrooveForms4\bg_Country.gif	taskhost.exe
File opened for modification	C:\Program Files\VideoLAN\VLC\AUTHORS.txt	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\DD01162_.WMF	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\NA00809_.WMF	taskhost.exe
File opened for modification	C:\Program Files\Java\jre7\lib\zi\SystemV\EST5	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\AG00120_.GIF	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\BL00262_.WMF	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\BS00100_.WMF	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\PE00272_.WMF	taskhost.exe
File opened for modification	C:\Program Files\Java\jdk1.7.0_80\lib\missioncontrol\dropins\RyukReadMe.txt	taskhost.exe
File opened for modification	C:\Program Files\Java\jdk1.7.0_80\lib\visualvm\platform\modules\org-netbeans-core-io-ui.jar	taskhost.exe
File opened for modification	C:\Program Files\Java\jdk1.7.0_80\lib\visualvm\profiler\modules\org-netbeans-modules-profiler-api.jar	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\SO00466_.WMF	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\Groove\ToolData\groove.net\GrooveForms\FormsTemplates\Track Issues.fdt	taskhost.exe
File opened for modification	C:\Program Files (x86)\Common Files\System\msadc\handsafe.reg	taskhost.exe
File opened for modification	C:\Program Files\Common Files\System\ado\adovbs.inc	taskhost.exe
File opened for modification	C:\Program Files\Java\jdk1.7.0_80\jre\lib\zi\America\Managua	taskhost.exe
File opened for modification	C:\Program Files\VideoLAN\VLC\locale\ks_IN\RyukReadMe.txt	taskhost.exe
File opened for modification	C:\Program Files (x86)\Common Files\microsoft shared\THEMES14\EVRGREEN\EVRGREEN.ELM	taskhost.exe
File opened for modification	C:\Program Files (x86)\Common Files\microsoft shared\THEMES14\ICE\PREVIEW.GIF	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\OutlookAutoDiscover\YAHOO.COM.PH.XML	taskhost.exe
File opened for modification	C:\Program Files\Common Files\Microsoft Shared\Stationery\Genko_2.emf	taskhost.exe
File opened for modification	C:\Program Files\Java\jdk1.7.0_80\lib\visualvm\visualvm\config\Modules\org-openide-options.xml_hidden	taskhost.exe
File opened for modification	C:\Program Files\Microsoft Games\Multiplayer\Spades\it-IT\RyukReadMe.txt	taskhost.exe
File opened for modification	C:\Program Files\Java\jdk1.7.0_80\jre\lib\zi\Asia\Novosibirsk	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\MEDIA\OFFICE14\BULLETS\BD14530_.GIF	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\Groove\ToolData\groove.net\GrooveForms\BG_ADOBE.GIF	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\Groove\Sounds\Places\TOOT.WAV	taskhost.exe
File opened for modification	C:\Program Files\Java\jdk1.7.0_80\lib\missioncontrol\plugins\org.eclipse.equinox.event_1.3.100.v20140115-1647.jar	taskhost.exe
File opened for modification	C:\Program Files\Java\jre7\lib\zi\Asia\Macau	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\SO00910_.WMF	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\SO00683_.WMF	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Visual Studio 8\Common7\IDE\VSTA\ItemTemplates\VisualBasic\1033\Text.zip	taskhost.exe
File opened for modification	C:\Program Files\VideoLAN\VLC\locale\mr\LC_MESSAGES\vlc.mo	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\FD00403_.WMF	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\J0101863.BMP	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\Groove\ToolData\groove.net\GrooveForms4\FormsColorChart.html	taskhost.exe
File opened for modification	C:\Program Files\Java\jre7\lib\logging.properties	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\J0107302.WMF	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Document Themes 14\Theme Effects\Flow.eftx	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\J0105588.WMF	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\J0239973.WMF	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\Groove\ToolData\groove.net\GrooveForms4\FormsStyles\STS2\HEADER.GIF	taskhost.exe
File opened for modification	C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\v3.0\RyukReadMe.txt	taskhost.exe
File opened for modification	C:\Program Files\VideoLAN\VLC\lua\http\css\ui-lightness\images\ui-bg_diagonals-thick_18_b81900_40x40.png	taskhost.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\Office14\1033\PUBSPAPR\ZPDIR46F.GIF	taskhost.exe

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
1656	PQveL.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1656	PQveL.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 1916 wrote to memory of 1656	1916	23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2.exe	28
PID 1916 wrote to memory of 1656	1916	23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2.exe	28
PID 1916 wrote to memory of 1656	1916	23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2.exe	28
PID 1916 wrote to memory of 1656	1916	23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2.exe	28
PID 1656 wrote to memory of 1616	1656	PQveL.exe	29
PID 1656 wrote to memory of 1616	1656	PQveL.exe	29
PID 1656 wrote to memory of 1616	1656	PQveL.exe	29
PID 1656 wrote to memory of 1128	1656	PQveL.exe	11
PID 1616 wrote to memory of 844	1616	cmd.exe	31
PID 1616 wrote to memory of 844	1616	cmd.exe	31
PID 1616 wrote to memory of 844	1616	cmd.exe	31
PID 1656 wrote to memory of 1192	1656	PQveL.exe	19

C:\Windows\system32\taskhost.exe
"taskhost.exe"
1⤵
- Modifies extensions of user files
- Drops file in Program Files directory
PID:1128

C:\Windows\system32\Dwm.exe
"C:\Windows\system32\Dwm.exe"
1⤵
PID:1192

C:\Users\Admin\AppData\Local\Temp\23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2.exe
"C:\Users\Admin\AppData\Local\Temp\23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:1916
- C:\users\Public\PQveL.exe
  "C:\users\Public\PQveL.exe" C:\Users\Admin\AppData\Local\Temp\23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2.exe
  2⤵
  - Deletes itself
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1656
- - 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\PQveL.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\PQveL.exe" /f
      4⤵
      Adds Run key to start application
      PID:844

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

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:\Users\Public\PQveL.exe

Filesize
170KB

MD5
31bd0f224e7e74eee2847f43aae23974

SHA1
92e331e1e8ad30538f38dd7ba31386afafa14a58

SHA256
8b0a5fb13309623c3518473551cb1f55d38d8450129d4a3c16b476f7b2867d7d

SHA512
a13f05a12b084ef425f542ff4be824bbccb5dbdfe085af8b7e19d81a6bcba4b8c1debcc38f6b57bc9265a4db21eed70852ece8cc62b3ef14c47fca3035a55249

Download Submit
\Users\Public\PQveL.exe

Filesize
170KB

MD5
31bd0f224e7e74eee2847f43aae23974

SHA1
92e331e1e8ad30538f38dd7ba31386afafa14a58

SHA256
8b0a5fb13309623c3518473551cb1f55d38d8450129d4a3c16b476f7b2867d7d

SHA512
a13f05a12b084ef425f542ff4be824bbccb5dbdfe085af8b7e19d81a6bcba4b8c1debcc38f6b57bc9265a4db21eed70852ece8cc62b3ef14c47fca3035a55249

Download Submit
memory/1128-60-0x000000013FB20000-0x000000013FEAE000-memory.dmp

Filesize
3.6MB

Download
memory/1128-63-0x000000013FB20000-0x000000013FEAE000-memory.dmp

Filesize
3.6MB

Download
memory/1128-66-0x000000013FB20000-0x000000013FEAE000-memory.dmp

Filesize
3.6MB

Download
memory/1656-58-0x000007FEFB901000-0x000007FEFB903000-memory.dmp

Filesize
8KB

Download
memory/1916-54-0x0000000075C51000-0x0000000075C53000-memory.dmp

Filesize
8KB

Download