Malware Analysis Report

2024-10-23 18:37

Sample ID 220220-d3zx7agce2
Target a90285e58fd49c1ae1cbf50f7f37438b12aa08b61e52a1f612e6cf9863d18672
SHA256 a90285e58fd49c1ae1cbf50f7f37438b12aa08b61e52a1f612e6cf9863d18672
Tags
ryuk ransomware
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V6

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

a90285e58fd49c1ae1cbf50f7f37438b12aa08b61e52a1f612e6cf9863d18672

Threat Level: Known bad

The file a90285e58fd49c1ae1cbf50f7f37438b12aa08b61e52a1f612e6cf9863d18672 was found to be: Known bad.

Malicious Activity Summary

ryuk ransomware

Ryuk

Enumerates physical storage devices

Runs net.exe

Suspicious behavior: EnumeratesProcesses

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

Checks processor information in registry

Modifies data under HKEY_USERS

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2022-02-20 03:32

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2022-02-20 03:32

Reported

2022-02-20 03:49

Platform

win7-en-20211208

Max time kernel

170s

Max time network

144s

Command Line

"C:\Users\Admin\AppData\Local\Temp\a90285e58fd49c1ae1cbf50f7f37438b12aa08b61e52a1f612e6cf9863d18672.exe"

Signatures

Ryuk

ransomware ryuk

Enumerates physical storage devices

Runs net.exe

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeBackupPrivilege N/A C:\Users\Admin\AppData\Local\Temp\a90285e58fd49c1ae1cbf50f7f37438b12aa08b61e52a1f612e6cf9863d18672.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1472 wrote to memory of 2636 N/A C:\Users\Admin\AppData\Local\Temp\a90285e58fd49c1ae1cbf50f7f37438b12aa08b61e52a1f612e6cf9863d18672.exe C:\Windows\SysWOW64\net.exe
PID 1472 wrote to memory of 2636 N/A C:\Users\Admin\AppData\Local\Temp\a90285e58fd49c1ae1cbf50f7f37438b12aa08b61e52a1f612e6cf9863d18672.exe C:\Windows\SysWOW64\net.exe
PID 1472 wrote to memory of 2636 N/A C:\Users\Admin\AppData\Local\Temp\a90285e58fd49c1ae1cbf50f7f37438b12aa08b61e52a1f612e6cf9863d18672.exe C:\Windows\SysWOW64\net.exe
PID 1472 wrote to memory of 2636 N/A C:\Users\Admin\AppData\Local\Temp\a90285e58fd49c1ae1cbf50f7f37438b12aa08b61e52a1f612e6cf9863d18672.exe C:\Windows\SysWOW64\net.exe
PID 1472 wrote to memory of 2764 N/A C:\Users\Admin\AppData\Local\Temp\a90285e58fd49c1ae1cbf50f7f37438b12aa08b61e52a1f612e6cf9863d18672.exe C:\Windows\SysWOW64\net.exe
PID 1472 wrote to memory of 2764 N/A C:\Users\Admin\AppData\Local\Temp\a90285e58fd49c1ae1cbf50f7f37438b12aa08b61e52a1f612e6cf9863d18672.exe C:\Windows\SysWOW64\net.exe
PID 1472 wrote to memory of 2764 N/A C:\Users\Admin\AppData\Local\Temp\a90285e58fd49c1ae1cbf50f7f37438b12aa08b61e52a1f612e6cf9863d18672.exe C:\Windows\SysWOW64\net.exe
PID 1472 wrote to memory of 2764 N/A C:\Users\Admin\AppData\Local\Temp\a90285e58fd49c1ae1cbf50f7f37438b12aa08b61e52a1f612e6cf9863d18672.exe C:\Windows\SysWOW64\net.exe
PID 2764 wrote to memory of 5612 N/A C:\Windows\SysWOW64\net.exe C:\Windows\SysWOW64\net1.exe
PID 2764 wrote to memory of 5612 N/A C:\Windows\SysWOW64\net.exe C:\Windows\SysWOW64\net1.exe
PID 2764 wrote to memory of 5612 N/A C:\Windows\SysWOW64\net.exe C:\Windows\SysWOW64\net1.exe
PID 2764 wrote to memory of 5612 N/A C:\Windows\SysWOW64\net.exe C:\Windows\SysWOW64\net1.exe
PID 2636 wrote to memory of 5604 N/A C:\Windows\SysWOW64\net.exe C:\Windows\SysWOW64\net1.exe
PID 2636 wrote to memory of 5604 N/A C:\Windows\SysWOW64\net.exe C:\Windows\SysWOW64\net1.exe
PID 2636 wrote to memory of 5604 N/A C:\Windows\SysWOW64\net.exe C:\Windows\SysWOW64\net1.exe
PID 2636 wrote to memory of 5604 N/A C:\Windows\SysWOW64\net.exe C:\Windows\SysWOW64\net1.exe
PID 1472 wrote to memory of 8768 N/A C:\Users\Admin\AppData\Local\Temp\a90285e58fd49c1ae1cbf50f7f37438b12aa08b61e52a1f612e6cf9863d18672.exe C:\Windows\SysWOW64\net.exe
PID 1472 wrote to memory of 8768 N/A C:\Users\Admin\AppData\Local\Temp\a90285e58fd49c1ae1cbf50f7f37438b12aa08b61e52a1f612e6cf9863d18672.exe C:\Windows\SysWOW64\net.exe
PID 1472 wrote to memory of 8768 N/A C:\Users\Admin\AppData\Local\Temp\a90285e58fd49c1ae1cbf50f7f37438b12aa08b61e52a1f612e6cf9863d18672.exe C:\Windows\SysWOW64\net.exe
PID 1472 wrote to memory of 8768 N/A C:\Users\Admin\AppData\Local\Temp\a90285e58fd49c1ae1cbf50f7f37438b12aa08b61e52a1f612e6cf9863d18672.exe C:\Windows\SysWOW64\net.exe
PID 8768 wrote to memory of 8792 N/A C:\Windows\SysWOW64\net.exe C:\Windows\SysWOW64\net1.exe
PID 8768 wrote to memory of 8792 N/A C:\Windows\SysWOW64\net.exe C:\Windows\SysWOW64\net1.exe
PID 8768 wrote to memory of 8792 N/A C:\Windows\SysWOW64\net.exe C:\Windows\SysWOW64\net1.exe
PID 8768 wrote to memory of 8792 N/A C:\Windows\SysWOW64\net.exe C:\Windows\SysWOW64\net1.exe
PID 1472 wrote to memory of 16788 N/A C:\Users\Admin\AppData\Local\Temp\a90285e58fd49c1ae1cbf50f7f37438b12aa08b61e52a1f612e6cf9863d18672.exe C:\Windows\SysWOW64\net.exe
PID 1472 wrote to memory of 16788 N/A C:\Users\Admin\AppData\Local\Temp\a90285e58fd49c1ae1cbf50f7f37438b12aa08b61e52a1f612e6cf9863d18672.exe C:\Windows\SysWOW64\net.exe
PID 1472 wrote to memory of 16788 N/A C:\Users\Admin\AppData\Local\Temp\a90285e58fd49c1ae1cbf50f7f37438b12aa08b61e52a1f612e6cf9863d18672.exe C:\Windows\SysWOW64\net.exe
PID 1472 wrote to memory of 16788 N/A C:\Users\Admin\AppData\Local\Temp\a90285e58fd49c1ae1cbf50f7f37438b12aa08b61e52a1f612e6cf9863d18672.exe C:\Windows\SysWOW64\net.exe
PID 16788 wrote to memory of 16812 N/A C:\Windows\SysWOW64\net.exe C:\Windows\SysWOW64\net1.exe
PID 16788 wrote to memory of 16812 N/A C:\Windows\SysWOW64\net.exe C:\Windows\SysWOW64\net1.exe
PID 16788 wrote to memory of 16812 N/A C:\Windows\SysWOW64\net.exe C:\Windows\SysWOW64\net1.exe
PID 16788 wrote to memory of 16812 N/A C:\Windows\SysWOW64\net.exe C:\Windows\SysWOW64\net1.exe

Processes

C:\Users\Admin\AppData\Local\Temp\a90285e58fd49c1ae1cbf50f7f37438b12aa08b61e52a1f612e6cf9863d18672.exe

"C:\Users\Admin\AppData\Local\Temp\a90285e58fd49c1ae1cbf50f7f37438b12aa08b61e52a1f612e6cf9863d18672.exe"

C:\Windows\SysWOW64\net.exe

"C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y

C:\Windows\SysWOW64\net.exe

"C:\Windows\System32\net.exe" stop "samss" /y

C:\Windows\SysWOW64\net1.exe

C:\Windows\system32\net1 stop "audioendpointbuilder" /y

C:\Windows\SysWOW64\net1.exe

C:\Windows\system32\net1 stop "samss" /y

C:\Windows\SysWOW64\net.exe

"C:\Windows\System32\net.exe" stop "samss" /y

C:\Windows\SysWOW64\net1.exe

C:\Windows\system32\net1 stop "samss" /y

C:\Windows\SysWOW64\net.exe

"C:\Windows\System32\net.exe" stop "samss" /y

C:\Windows\SysWOW64\net1.exe

C:\Windows\system32\net1 stop "samss" /y

Network

N/A

Files

memory/1472-55-0x0000000075F81000-0x0000000075F83000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2022-02-20 03:32

Reported

2022-02-20 03:49

Platform

win10v2004-en-20220112

Max time kernel

180s

Max time network

198s

Command Line

"C:\Users\Admin\AppData\Local\Temp\a90285e58fd49c1ae1cbf50f7f37438b12aa08b61e52a1f612e6cf9863d18672.exe"

Signatures

Ryuk

ransomware ryuk

Checks processor information in registry

Description Indicator Process Target
Key opened \Registry\Machine\HARDWARE\DESCRIPTION\System\CentralProcessor\0 C:\Windows\system32\MusNotifyIcon.exe N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz C:\Windows\system32\MusNotifyIcon.exe N/A

Modifies data under HKEY_USERS

Description Indicator Process Target
Key created \REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization C:\Windows\System32\svchost.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeBackupPrivilege N/A C:\Users\Admin\AppData\Local\Temp\a90285e58fd49c1ae1cbf50f7f37438b12aa08b61e52a1f612e6cf9863d18672.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\a90285e58fd49c1ae1cbf50f7f37438b12aa08b61e52a1f612e6cf9863d18672.exe

"C:\Users\Admin\AppData\Local\Temp\a90285e58fd49c1ae1cbf50f7f37438b12aa08b61e52a1f612e6cf9863d18672.exe"

C:\Windows\system32\MusNotifyIcon.exe

%systemroot%\system32\MusNotifyIcon.exe NotifyTrayIcon 13

C:\Windows\System32\svchost.exe

C:\Windows\System32\svchost.exe -k NetworkService -p

Network

Country Destination Domain Proto
US 209.197.3.8:80 tcp
US 209.197.3.8:80 tcp
US 209.197.3.8:80 tcp
US 209.197.3.8:80 tcp
US 8.8.8.8:53 106.89.54.20.in-addr.arpa udp

Files

N/A