Malware Analysis Report

2024-09-23 12:04

Sample ID 240612-nv5tksxblq
Target c074458d1518d60a2dcfa6cfa575dfd7f58cfe31934cd92b1095c4529964433b
SHA256 c074458d1518d60a2dcfa6cfa575dfd7f58cfe31934cd92b1095c4529964433b
Tags
bootkit evasion persistence trojan
score
9/10

Table of Contents

Analysis Overview

MITRE ATT&CK Matrix

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
9/10

SHA256

c074458d1518d60a2dcfa6cfa575dfd7f58cfe31934cd92b1095c4529964433b

Threat Level: Likely malicious

The file c074458d1518d60a2dcfa6cfa575dfd7f58cfe31934cd92b1095c4529964433b was found to be: Likely malicious.

Malicious Activity Summary

bootkit evasion persistence trojan

Identifies VirtualBox via ACPI registry values (likely anti-VM)

Executes dropped EXE

Checks BIOS information in registry

Writes to the Master Boot Record (MBR)

Checks whether UAC is enabled

Suspicious use of NtSetInformationThreadHideFromDebugger

Unsigned PE

Suspicious behavior: EnumeratesProcesses

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

MITRE ATT&CK Matrix V13

Analysis: static1

Detonation Overview

Reported

2024-06-12 11:44

Signatures

Unsigned PE

Description Indicator Process Target
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-06-12 11:44

Reported

2024-06-12 11:46

Platform

win7-20240611-en

Max time kernel

146s

Max time network

118s

Command Line

"C:\Users\Admin\AppData\Local\Temp\c074458d1518d60a2dcfa6cfa575dfd7f58cfe31934cd92b1095c4529964433b.exe"

Signatures

Identifies VirtualBox via ACPI registry values (likely anti-VM)

evasion
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__ C:\Users\Admin\AppData\Local\Temp\c074458d1518d60a2dcfa6cfa575dfd7f58cfe31934cd92b1095c4529964433b.exe N/A
Key opened \REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__ F:\yvchost.exe N/A

Checks BIOS information in registry

Description Indicator Process Target
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion C:\Users\Admin\AppData\Local\Temp\c074458d1518d60a2dcfa6cfa575dfd7f58cfe31934cd92b1095c4529964433b.exe N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion C:\Users\Admin\AppData\Local\Temp\c074458d1518d60a2dcfa6cfa575dfd7f58cfe31934cd92b1095c4529964433b.exe N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosDate C:\Users\Admin\AppData\Local\Temp\c074458d1518d60a2dcfa6cfa575dfd7f58cfe31934cd92b1095c4529964433b.exe N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion F:\yvchost.exe N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion F:\yvchost.exe N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosDate F:\yvchost.exe N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A F:\yvchost.exe N/A

Checks whether UAC is enabled

evasion trojan
Description Indicator Process Target
Key value queried \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA C:\Users\Admin\AppData\Local\Temp\c074458d1518d60a2dcfa6cfa575dfd7f58cfe31934cd92b1095c4529964433b.exe N/A
Key value queried \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA F:\yvchost.exe N/A

Writes to the Master Boot Record (MBR)

bootkit persistence
Description Indicator Process Target
File opened for modification \??\PhysicalDrive0 C:\Users\Admin\AppData\Local\Temp\c074458d1518d60a2dcfa6cfa575dfd7f58cfe31934cd92b1095c4529964433b.exe N/A
File opened for modification \??\PhysicalDrive0 F:\yvchost.exe N/A

Suspicious use of NtSetInformationThreadHideFromDebugger

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\c074458d1518d60a2dcfa6cfa575dfd7f58cfe31934cd92b1095c4529964433b.exe N/A
N/A N/A F:\yvchost.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\c074458d1518d60a2dcfa6cfa575dfd7f58cfe31934cd92b1095c4529964433b.exe N/A
N/A N/A F:\yvchost.exe N/A
N/A N/A F:\yvchost.exe N/A
N/A N/A F:\yvchost.exe N/A
N/A N/A F:\yvchost.exe N/A
N/A N/A F:\yvchost.exe N/A
N/A N/A F:\yvchost.exe N/A
N/A N/A F:\yvchost.exe N/A
N/A N/A F:\yvchost.exe N/A
N/A N/A F:\yvchost.exe N/A
N/A N/A F:\yvchost.exe N/A
N/A N/A F:\yvchost.exe N/A
N/A N/A F:\yvchost.exe N/A
N/A N/A F:\yvchost.exe N/A
N/A N/A F:\yvchost.exe N/A
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N/A N/A F:\yvchost.exe N/A
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N/A N/A F:\yvchost.exe N/A
N/A N/A F:\yvchost.exe N/A
N/A N/A F:\yvchost.exe N/A
N/A N/A F:\yvchost.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\c074458d1518d60a2dcfa6cfa575dfd7f58cfe31934cd92b1095c4529964433b.exe

"C:\Users\Admin\AppData\Local\Temp\c074458d1518d60a2dcfa6cfa575dfd7f58cfe31934cd92b1095c4529964433b.exe"

F:\yvchost.exe

F:\yvchost.exe

Network

Country Destination Domain Proto
US 8.8.8.8:53 ip.cn udp
US 104.21.64.12:443 ip.cn tcp

Files

memory/2488-0-0x0000000000400000-0x0000000000E1F000-memory.dmp

memory/2488-1-0x0000000077900000-0x0000000077902000-memory.dmp

memory/2488-3-0x0000000000400000-0x0000000000E1F000-memory.dmp

memory/2488-4-0x0000000000400000-0x0000000000E1F000-memory.dmp

memory/2488-5-0x0000000000400000-0x0000000000E1F000-memory.dmp

F:\yvchost.exe

MD5 fe1346c94d38693912f3c7f294b866e3
SHA1 174e68efebb94aae6a463a8e7e85dbd77c3e085f
SHA256 c074458d1518d60a2dcfa6cfa575dfd7f58cfe31934cd92b1095c4529964433b
SHA512 bfc7c39490e9c9287701d61e6617199c181cc582f437c263fac95338231998023c715e02266e6f3afd39fea093f5ac51a37d8e3e16db220a8cf480e9f40e4ef4

memory/2488-12-0x0000000003330000-0x0000000003D4F000-memory.dmp

memory/2660-13-0x0000000000400000-0x0000000000E1F000-memory.dmp

memory/2488-14-0x0000000003330000-0x0000000003D4F000-memory.dmp

C:\ProgramData\mntemp

MD5 5adc4b666885a0e9b05906fd55c216c5
SHA1 a189b4ff16062241912f571b14d7ef5d3df7a42a
SHA256 a12fdcbc4446ed61726ad5c03f72312ff6cb9d27a5ed324f538d66236963d81f
SHA512 35435a93b2bded1692551ff97154943c5a283eec8ae125f0e4c15dd282a038ea90fe706efc6bbfa7818c4a65154314020b9604d3ad756efe405718ed40f76f64

memory/2660-18-0x0000000000400000-0x0000000000E1F000-memory.dmp

memory/2660-16-0x0000000000400000-0x0000000000E1F000-memory.dmp

memory/2660-17-0x0000000000400000-0x0000000000E1F000-memory.dmp

memory/2488-20-0x0000000000400000-0x0000000000E1F000-memory.dmp

memory/2660-21-0x0000000000400000-0x0000000000E1F000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-06-12 11:44

Reported

2024-06-12 11:46

Platform

win10v2004-20240611-en

Max time kernel

148s

Max time network

125s

Command Line

"C:\Users\Admin\AppData\Local\Temp\c074458d1518d60a2dcfa6cfa575dfd7f58cfe31934cd92b1095c4529964433b.exe"

Signatures

Identifies VirtualBox via ACPI registry values (likely anti-VM)

evasion
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__ C:\Users\Admin\AppData\Local\Temp\c074458d1518d60a2dcfa6cfa575dfd7f58cfe31934cd92b1095c4529964433b.exe N/A
Key opened \REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__ F:\yvchost.exe N/A

Checks BIOS information in registry

Description Indicator Process Target
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion C:\Users\Admin\AppData\Local\Temp\c074458d1518d60a2dcfa6cfa575dfd7f58cfe31934cd92b1095c4529964433b.exe N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion C:\Users\Admin\AppData\Local\Temp\c074458d1518d60a2dcfa6cfa575dfd7f58cfe31934cd92b1095c4529964433b.exe N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosDate C:\Users\Admin\AppData\Local\Temp\c074458d1518d60a2dcfa6cfa575dfd7f58cfe31934cd92b1095c4529964433b.exe N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion F:\yvchost.exe N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion F:\yvchost.exe N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosDate F:\yvchost.exe N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A F:\yvchost.exe N/A

Checks whether UAC is enabled

evasion trojan
Description Indicator Process Target
Key value queried \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA C:\Users\Admin\AppData\Local\Temp\c074458d1518d60a2dcfa6cfa575dfd7f58cfe31934cd92b1095c4529964433b.exe N/A
Key value queried \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA F:\yvchost.exe N/A

Writes to the Master Boot Record (MBR)

bootkit persistence
Description Indicator Process Target
File opened for modification \??\PhysicalDrive0 C:\Users\Admin\AppData\Local\Temp\c074458d1518d60a2dcfa6cfa575dfd7f58cfe31934cd92b1095c4529964433b.exe N/A
File opened for modification \??\PhysicalDrive0 F:\yvchost.exe N/A

Suspicious use of NtSetInformationThreadHideFromDebugger

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\c074458d1518d60a2dcfa6cfa575dfd7f58cfe31934cd92b1095c4529964433b.exe N/A
N/A N/A F:\yvchost.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\c074458d1518d60a2dcfa6cfa575dfd7f58cfe31934cd92b1095c4529964433b.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\c074458d1518d60a2dcfa6cfa575dfd7f58cfe31934cd92b1095c4529964433b.exe N/A
N/A N/A F:\yvchost.exe N/A
N/A N/A F:\yvchost.exe N/A
N/A N/A F:\yvchost.exe N/A
N/A N/A F:\yvchost.exe N/A
N/A N/A F:\yvchost.exe N/A
N/A N/A F:\yvchost.exe N/A
N/A N/A F:\yvchost.exe N/A
N/A N/A F:\yvchost.exe N/A
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N/A N/A F:\yvchost.exe N/A
N/A N/A F:\yvchost.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\c074458d1518d60a2dcfa6cfa575dfd7f58cfe31934cd92b1095c4529964433b.exe

"C:\Users\Admin\AppData\Local\Temp\c074458d1518d60a2dcfa6cfa575dfd7f58cfe31934cd92b1095c4529964433b.exe"

F:\yvchost.exe

F:\yvchost.exe

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 2.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 g.bing.com udp
US 204.79.197.237:443 g.bing.com tcp
NL 23.62.61.185:443 www.bing.com tcp
US 8.8.8.8:53 237.197.79.204.in-addr.arpa udp
US 8.8.8.8:53 185.61.62.23.in-addr.arpa udp
US 8.8.8.8:53 ip.cn udp
US 172.67.174.23:443 ip.cn tcp
US 8.8.8.8:53 23.174.67.172.in-addr.arpa udp
US 8.8.8.8:53 73.144.22.2.in-addr.arpa udp
US 8.8.8.8:53 30.243.111.52.in-addr.arpa udp

Files

memory/4080-1-0x0000000077174000-0x0000000077176000-memory.dmp

memory/4080-0-0x0000000000400000-0x0000000000E1F000-memory.dmp

memory/4080-3-0x0000000000400000-0x0000000000E1F000-memory.dmp

memory/4080-4-0x0000000000400000-0x0000000000E1F000-memory.dmp

memory/4080-5-0x0000000000400000-0x0000000000E1F000-memory.dmp

F:\yvchost.exe

MD5 fe1346c94d38693912f3c7f294b866e3
SHA1 174e68efebb94aae6a463a8e7e85dbd77c3e085f
SHA256 c074458d1518d60a2dcfa6cfa575dfd7f58cfe31934cd92b1095c4529964433b
SHA512 bfc7c39490e9c9287701d61e6617199c181cc582f437c263fac95338231998023c715e02266e6f3afd39fea093f5ac51a37d8e3e16db220a8cf480e9f40e4ef4

C:\ProgramData\mntemp

MD5 5adc4b666885a0e9b05906fd55c216c5
SHA1 a189b4ff16062241912f571b14d7ef5d3df7a42a
SHA256 a12fdcbc4446ed61726ad5c03f72312ff6cb9d27a5ed324f538d66236963d81f
SHA512 35435a93b2bded1692551ff97154943c5a283eec8ae125f0e4c15dd282a038ea90fe706efc6bbfa7818c4a65154314020b9604d3ad756efe405718ed40f76f64

memory/2328-13-0x0000000000400000-0x0000000000E1F000-memory.dmp

memory/2328-12-0x0000000000400000-0x0000000000E1F000-memory.dmp

memory/2328-11-0x0000000000400000-0x0000000000E1F000-memory.dmp

memory/4080-15-0x0000000000400000-0x0000000000E1F000-memory.dmp

memory/2328-16-0x0000000000400000-0x0000000000E1F000-memory.dmp