Malware Analysis Report

2024-10-16 06:27

Sample ID 220201-b4bkwaehcm
Target a3bae3ec7be4c3e6776aab4583d5fc313810c8eb037bcb841861378bb65dcb61
SHA256 a3bae3ec7be4c3e6776aab4583d5fc313810c8eb037bcb841861378bb65dcb61
Tags
ta505 persistence
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V6

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

a3bae3ec7be4c3e6776aab4583d5fc313810c8eb037bcb841861378bb65dcb61

Threat Level: Known bad

The file a3bae3ec7be4c3e6776aab4583d5fc313810c8eb037bcb841861378bb65dcb61 was found to be: Known bad.

Malicious Activity Summary

ta505 persistence

TA505

Sets service image path in registry

Drops file in Windows directory

Modifies data under HKEY_USERS

Suspicious behavior: EnumeratesProcesses

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2022-02-01 01:41

Signatures

N/A

Analysis: behavioral2

Detonation Overview

Submitted

2022-02-01 01:41

Reported

2022-02-01 01:44

Platform

win10v2004-en-20220113

Max time kernel

127s

Max time network

165s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\a3bae3ec7be4c3e6776aab4583d5fc313810c8eb037bcb841861378bb65dcb61.dll,#1

Signatures

TA505

ta505

Sets service image path in registry

persistence

Drops file in Windows directory

Description Indicator Process Target
File opened for modification C:\Windows\SoftwareDistribution\DataStore\Logs\edb.chk C:\Windows\system32\svchost.exe N/A
File opened for modification C:\Windows\SoftwareDistribution\DataStore\Logs\edb.log C:\Windows\system32\svchost.exe N/A
File opened for modification C:\Windows\SoftwareDistribution\DataStore\DataStore.edb C:\Windows\system32\svchost.exe N/A
File opened for modification C:\Windows\SoftwareDistribution\DataStore\DataStore.jfm C:\Windows\system32\svchost.exe N/A
File opened for modification C:\Windows\SoftwareDistribution\ReportingEvents.log C:\Windows\system32\svchost.exe N/A
File opened for modification C:\Windows\WindowsUpdate.log C:\Windows\system32\svchost.exe N/A

Modifies data under HKEY_USERS

Description Indicator Process Target
Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople\CRLs C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople\CTLs C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople\Certificates C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA\CRLs C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root\Certificates C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root\CRLs C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot\CTLs C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust\Certificates C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot\CRLs C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA\Certificates C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA\CTLs C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed\Certificates C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed\CRLs C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust\CTLs C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust\Certificates C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed\CRLs C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust\CRLs C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot\Certificates C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople\Certificates C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA\CTLs C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed\CTLs C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople\CRLs C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople\CTLs C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust\CRLs C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust\CTLs C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\WinTrust\Trust Providers\Software Publishing C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA\Certificates C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed\Certificates C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root\CTLs C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA\CRLs C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed\CTLs C:\Windows\System32\WaaSMedicAgent.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust C:\Windows\System32\WaaSMedicAgent.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\rundll32.exe N/A
N/A N/A C:\Windows\SysWOW64\rundll32.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeShutdownPrivilege N/A C:\Windows\system32\svchost.exe N/A
Token: SeCreatePagefilePrivilege N/A C:\Windows\system32\svchost.exe N/A
Token: SeShutdownPrivilege N/A C:\Windows\system32\svchost.exe N/A
Token: SeCreatePagefilePrivilege N/A C:\Windows\system32\svchost.exe N/A
Token: SeShutdownPrivilege N/A C:\Windows\system32\svchost.exe N/A
Token: SeCreatePagefilePrivilege N/A C:\Windows\system32\svchost.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 3388 wrote to memory of 3512 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 3388 wrote to memory of 3512 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 3388 wrote to memory of 3512 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe

Processes

C:\Windows\system32\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\a3bae3ec7be4c3e6776aab4583d5fc313810c8eb037bcb841861378bb65dcb61.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\a3bae3ec7be4c3e6776aab4583d5fc313810c8eb037bcb841861378bb65dcb61.dll,#1

C:\Windows\System32\WaaSMedicAgent.exe

C:\Windows\System32\WaaSMedicAgent.exe 96df1b8c63e130455b6313ff88bde132 cf8gre/zKEWJTDzlkaynQg.0.1.0.0.0

C:\Windows\system32\svchost.exe

C:\Windows\system32\svchost.exe -k netsvcs -p -s wuauserv

Network

Country Destination Domain Proto
NL 20.190.160.129:443 tcp
US 8.8.8.8:53 windows-se-update.com udp
US 8.8.8.8:53 settings-win.data.microsoft.com udp
NL 51.124.78.146:443 settings-win.data.microsoft.com tcp
US 8.8.8.8:53 settings-win.data.microsoft.com udp
US 52.167.17.97:443 settings-win.data.microsoft.com tcp
US 52.167.17.97:443 settings-win.data.microsoft.com tcp
US 52.167.17.97:443 settings-win.data.microsoft.com tcp
US 52.167.17.97:443 settings-win.data.microsoft.com tcp

Files

memory/3512-130-0x0000000075680000-0x00000000756C0000-memory.dmp

memory/4328-143-0x000001BF97730000-0x000001BF97734000-memory.dmp

Analysis: behavioral1

Detonation Overview

Submitted

2022-02-01 01:41

Reported

2022-02-01 01:44

Platform

win7-en-20211208

Max time kernel

117s

Max time network

118s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\a3bae3ec7be4c3e6776aab4583d5fc313810c8eb037bcb841861378bb65dcb61.dll,#1

Signatures

TA505

ta505

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\rundll32.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1756 wrote to memory of 1112 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1756 wrote to memory of 1112 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1756 wrote to memory of 1112 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1756 wrote to memory of 1112 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1756 wrote to memory of 1112 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1756 wrote to memory of 1112 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1756 wrote to memory of 1112 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe

Processes

C:\Windows\system32\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\a3bae3ec7be4c3e6776aab4583d5fc313810c8eb037bcb841861378bb65dcb61.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\a3bae3ec7be4c3e6776aab4583d5fc313810c8eb037bcb841861378bb65dcb61.dll,#1

Network

Country Destination Domain Proto
US 8.8.8.8:53 windows-se-update.com udp

Files

memory/1112-54-0x0000000075D61000-0x0000000075D63000-memory.dmp

memory/1112-55-0x0000000075100000-0x0000000075140000-memory.dmp