Malware Analysis Report

2024-09-11 08:54

Sample ID 240424-va4t4sdd8z
Target Client-built.exe
SHA256 68a11c9b5380f4651ca2c7246a43d6fa905711357c773605aefb7f7ee6e6edc8
Tags
cheat quasar spyware trojan
score
10/10

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
10/10

SHA256

68a11c9b5380f4651ca2c7246a43d6fa905711357c773605aefb7f7ee6e6edc8

Threat Level: Known bad

The file Client-built.exe was found to be: Known bad.

Malicious Activity Summary

cheat quasar spyware trojan

Quasar family

Quasar payload

Quasar RAT

Executes dropped EXE

Drops file in System32 directory

Unsigned PE

Enumerates physical storage devices

Suspicious use of WriteProcessMemory

Suspicious use of FindShellTrayWindow

Suspicious use of SendNotifyMessage

Uses Task Scheduler COM API

Suspicious use of AdjustPrivilegeToken

Creates scheduled task(s)

MITRE ATT&CK Matrix V13

Initial Access
TA0001
Execution
TA0002
Scheduled Task/Job
T1053
Persistence
TA0003
Scheduled Task/Job
T1053
Privilege Escalation
TA0004
Scheduled Task/Job
T1053
Defense Evasion
TA0005
Credential Access
TA0006
Discovery
TA0007
System Information Discovery
T1082
Query Registry
T1012
Lateral Movement
TA0008
Collection
TA0009
Exfiltration
TA0010
Command and Control
TA0011
Impact
TA0040
Resource Development
TA0042
Reconnaissance
TA0043

Analysis: static1

Detonation Overview

Reported

2024-04-24 16:48

Signatures

Quasar family

quasar

Quasar payload

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

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-04-24 16:48

Reported

2024-04-24 16:50

Platform

win7-20240221-en

Max time kernel

150s

Max time network

137s

Command Line

"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"

Signatures

Quasar RAT

trojan spyware quasar

Quasar payload

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

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Windows\system32\SubDir\Client.exe N/A

Drops file in System32 directory

Description Indicator Process Target
File opened for modification C:\Windows\system32\SubDir\Client.exe C:\Users\Admin\AppData\Local\Temp\Client-built.exe N/A
File created C:\Windows\system32\SubDir\Client.exe C:\Users\Admin\AppData\Local\Temp\Client-built.exe N/A

Enumerates physical storage devices

Creates scheduled task(s)

persistence
Description Indicator Process Target
N/A N/A C:\Windows\system32\schtasks.exe N/A
N/A N/A C:\Windows\system32\schtasks.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\system32\SubDir\Client.exe N/A

Suspicious use of FindShellTrayWindow

Description Indicator Process Target
N/A N/A C:\Windows\system32\SubDir\Client.exe N/A

Suspicious use of SendNotifyMessage

Description Indicator Process Target
N/A N/A C:\Windows\system32\SubDir\Client.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2012 wrote to memory of 2592 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\system32\schtasks.exe
PID 2012 wrote to memory of 2592 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\system32\schtasks.exe
PID 2012 wrote to memory of 2592 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\system32\schtasks.exe
PID 2012 wrote to memory of 2064 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\system32\SubDir\Client.exe
PID 2012 wrote to memory of 2064 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\system32\SubDir\Client.exe
PID 2012 wrote to memory of 2064 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\system32\SubDir\Client.exe
PID 2064 wrote to memory of 2864 N/A C:\Windows\system32\SubDir\Client.exe C:\Windows\system32\schtasks.exe
PID 2064 wrote to memory of 2864 N/A C:\Windows\system32\SubDir\Client.exe C:\Windows\system32\schtasks.exe
PID 2064 wrote to memory of 2864 N/A C:\Windows\system32\SubDir\Client.exe C:\Windows\system32\schtasks.exe

Uses Task Scheduler COM API

persistence

Processes

C:\Users\Admin\AppData\Local\Temp\Client-built.exe

"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"

C:\Windows\system32\schtasks.exe

"schtasks" /create /tn "Java Updater" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f

C:\Windows\system32\SubDir\Client.exe

"C:\Windows\system32\SubDir\Client.exe"

C:\Windows\system32\schtasks.exe

"schtasks" /create /tn "Java Updater" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f

Network

Country Destination Domain Proto
N/A 192.168.178.23:4782 tcp
N/A 192.168.178.23:4782 tcp
N/A 192.168.178.23:4782 tcp
N/A 192.168.178.23:4782 tcp
N/A 192.168.178.23:4782 tcp
N/A 192.168.178.23:4782 tcp
N/A 192.168.178.23:4782 tcp

Files

memory/2012-0-0x0000000000A20000-0x0000000000D44000-memory.dmp

memory/2012-1-0x000007FEF5F80000-0x000007FEF696C000-memory.dmp

memory/2012-2-0x000000001B0A0000-0x000000001B120000-memory.dmp

C:\Windows\System32\SubDir\Client.exe

MD5 1a042eb9d21238cd93f8c04f4713d9ec
SHA1 bee49a94d392843f6cec2b0f81b56c0c652c3579
SHA256 68a11c9b5380f4651ca2c7246a43d6fa905711357c773605aefb7f7ee6e6edc8
SHA512 7dda1d567a1624d0a66b2fa4b5c31a3f350fce2e590683f52a4a8c2a38e871bb20cbe47fca6c1c76667be25dd7da5375503c8d5a0863417f0c419e82d3b87b79

memory/2064-8-0x000007FEF5F80000-0x000007FEF696C000-memory.dmp

memory/2064-7-0x0000000000980000-0x0000000000CA4000-memory.dmp

memory/2012-10-0x000007FEF5F80000-0x000007FEF696C000-memory.dmp

memory/2064-9-0x000000001B430000-0x000000001B4B0000-memory.dmp

memory/2064-11-0x000007FEF5F80000-0x000007FEF696C000-memory.dmp

memory/2064-12-0x000000001B430000-0x000000001B4B0000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-04-24 16:48

Reported

2024-04-24 16:50

Platform

win10v2004-20240412-en

Max time kernel

142s

Max time network

147s

Command Line

"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"

Signatures

Quasar RAT

trojan spyware quasar

Quasar payload

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

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Windows\system32\SubDir\Client.exe N/A

Drops file in System32 directory

Description Indicator Process Target
File created C:\Windows\system32\SubDir\Client.exe C:\Users\Admin\AppData\Local\Temp\Client-built.exe N/A
File opened for modification C:\Windows\system32\SubDir\Client.exe C:\Users\Admin\AppData\Local\Temp\Client-built.exe N/A

Enumerates physical storage devices

Creates scheduled task(s)

persistence
Description Indicator Process Target
N/A N/A C:\Windows\SYSTEM32\schtasks.exe N/A
N/A N/A C:\Windows\SYSTEM32\schtasks.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\system32\SubDir\Client.exe N/A

Suspicious use of FindShellTrayWindow

Description Indicator Process Target
N/A N/A C:\Windows\system32\SubDir\Client.exe N/A

Suspicious use of SendNotifyMessage

Description Indicator Process Target
N/A N/A C:\Windows\system32\SubDir\Client.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 228 wrote to memory of 4732 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\SYSTEM32\schtasks.exe
PID 228 wrote to memory of 4732 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\SYSTEM32\schtasks.exe
PID 228 wrote to memory of 1672 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\system32\SubDir\Client.exe
PID 228 wrote to memory of 1672 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\system32\SubDir\Client.exe
PID 1672 wrote to memory of 1988 N/A C:\Windows\system32\SubDir\Client.exe C:\Windows\SYSTEM32\schtasks.exe
PID 1672 wrote to memory of 1988 N/A C:\Windows\system32\SubDir\Client.exe C:\Windows\SYSTEM32\schtasks.exe

Uses Task Scheduler COM API

persistence

Processes

C:\Users\Admin\AppData\Local\Temp\Client-built.exe

"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"

C:\Windows\SYSTEM32\schtasks.exe

"schtasks" /create /tn "Java Updater" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f

C:\Windows\system32\SubDir\Client.exe

"C:\Windows\system32\SubDir\Client.exe"

C:\Windows\SYSTEM32\schtasks.exe

"schtasks" /create /tn "Java Updater" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 104.219.191.52.in-addr.arpa udp
US 8.8.8.8:53 240.197.17.2.in-addr.arpa udp
US 8.8.8.8:53 9.228.82.20.in-addr.arpa udp
US 8.8.8.8:53 67.32.209.4.in-addr.arpa udp
US 8.8.8.8:53 21.114.53.23.in-addr.arpa udp
US 8.8.8.8:53 g.bing.com udp
US 204.79.197.237:443 g.bing.com tcp
N/A 192.168.178.23:4782 tcp
US 8.8.8.8:53 88.156.103.20.in-addr.arpa udp
US 8.8.8.8:53 237.197.79.204.in-addr.arpa udp
NL 23.62.61.97:443 www.bing.com tcp
US 8.8.8.8:53 97.61.62.23.in-addr.arpa udp
US 8.8.8.8:53 58.55.71.13.in-addr.arpa udp
US 8.8.8.8:53 13.86.106.20.in-addr.arpa udp
N/A 192.168.178.23:4782 tcp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
US 8.8.8.8:53 86.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
N/A 192.168.178.23:4782 tcp
US 8.8.8.8:53 240.221.184.93.in-addr.arpa udp
US 8.8.8.8:53 57.169.31.20.in-addr.arpa udp
US 8.8.8.8:53 48.251.17.2.in-addr.arpa udp
N/A 192.168.178.23:4782 tcp
US 8.8.8.8:53 11.227.111.52.in-addr.arpa udp
N/A 192.168.178.23:4782 tcp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 200.197.79.204.in-addr.arpa udp
N/A 192.168.178.23:4782 tcp

Files

memory/228-0-0x0000000000880000-0x0000000000BA4000-memory.dmp

memory/228-1-0x00007FFE2D560000-0x00007FFE2E021000-memory.dmp

memory/228-2-0x0000000002C30000-0x0000000002C40000-memory.dmp

C:\Windows\System32\SubDir\Client.exe

MD5 1a042eb9d21238cd93f8c04f4713d9ec
SHA1 bee49a94d392843f6cec2b0f81b56c0c652c3579
SHA256 68a11c9b5380f4651ca2c7246a43d6fa905711357c773605aefb7f7ee6e6edc8
SHA512 7dda1d567a1624d0a66b2fa4b5c31a3f350fce2e590683f52a4a8c2a38e871bb20cbe47fca6c1c76667be25dd7da5375503c8d5a0863417f0c419e82d3b87b79

memory/228-9-0x00007FFE2D560000-0x00007FFE2E021000-memory.dmp

memory/1672-8-0x00007FFE2D560000-0x00007FFE2E021000-memory.dmp

memory/1672-10-0x000000001BB10000-0x000000001BB20000-memory.dmp

memory/1672-11-0x000000001C6E0000-0x000000001C730000-memory.dmp

memory/1672-12-0x000000001C7F0000-0x000000001C8A2000-memory.dmp

memory/1672-13-0x00007FFE2D560000-0x00007FFE2E021000-memory.dmp