Malware Analysis Report

2024-08-06 11:21

Sample ID 240617-btws3axhkf
Target Client-built.exe
SHA256 17242abb236c188858e3e908bde7c005563f15394b3fbc038eb15b9ab1cbeae2
Tags
eyewalled 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

17242abb236c188858e3e908bde7c005563f15394b3fbc038eb15b9ab1cbeae2

Threat Level: Known bad

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

Malicious Activity Summary

eyewalled quasar spyware trojan

Quasar RAT

Quasar family

Quasar payload

Unsigned PE

Enumerates physical storage devices

Suspicious use of FindShellTrayWindow

Suspicious use of SendNotifyMessage

Suspicious use of WriteProcessMemory

Suspicious use of AdjustPrivilegeToken

Creates scheduled task(s)

Uses Task Scheduler COM API

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

2024-06-17 01:26

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

2024-06-17 01:26

Reported

2024-06-17 01:29

Platform

win7-20240611-en

Max time kernel

128s

Max time network

141s

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

Enumerates physical storage devices

Creates scheduled task(s)

persistence
Description Indicator Process Target
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

Suspicious use of FindShellTrayWindow

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

Suspicious use of SendNotifyMessage

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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2448 wrote to memory of 3036 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\system32\schtasks.exe
PID 2448 wrote to memory of 3036 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\system32\schtasks.exe
PID 2448 wrote to memory of 3036 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.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 "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\Management\Client.exe" /rl HIGHEST /f

Network

Country Destination Domain Proto
US 147.185.221.18:18043 tcp
US 147.185.221.18:1358 tcp
US 147.185.221.18:18043 tcp
US 147.185.221.18:1358 tcp
US 147.185.221.18:18043 tcp
US 147.185.221.18:1358 tcp

Files

memory/2448-0-0x000007FEF5B53000-0x000007FEF5B54000-memory.dmp

memory/2448-1-0x0000000001140000-0x0000000001464000-memory.dmp

memory/2448-2-0x000007FEF5B50000-0x000007FEF653C000-memory.dmp

memory/2448-3-0x000007FEF5B53000-0x000007FEF5B54000-memory.dmp

memory/2448-4-0x000007FEF5B50000-0x000007FEF653C000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-06-17 01:26

Reported

2024-06-17 01:29

Platform

win10v2004-20240611-en

Max time kernel

150s

Max time network

151s

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

Enumerates physical storage devices

Creates scheduled task(s)

persistence
Description Indicator Process Target
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

Suspicious use of FindShellTrayWindow

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

Suspicious use of SendNotifyMessage

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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 636 wrote to memory of 4956 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\SYSTEM32\schtasks.exe
PID 636 wrote to memory of 4956 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.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 "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\Management\Client.exe" /rl HIGHEST /f

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe

"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --field-trial-handle=3812,i,11751898164297348119,13021661521765644467,262144 --variations-seed-version --mojo-platform-channel-handle=4184 /prefetch:8

Network

Country Destination Domain Proto
US 147.185.221.18:18043 tcp
US 8.8.8.8:53 g.bing.com udp
US 13.107.21.237:443 g.bing.com tcp
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 136.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
BE 23.41.178.51:443 www.bing.com tcp
US 8.8.8.8:53 237.21.107.13.in-addr.arpa udp
US 8.8.8.8:53 51.178.41.23.in-addr.arpa udp
US 147.185.221.18:1358 tcp
US 8.8.8.8:53 50.23.12.20.in-addr.arpa udp
US 8.8.8.8:53 198.187.3.20.in-addr.arpa udp
US 147.185.221.18:18043 tcp
US 8.8.8.8:53 21.236.111.52.in-addr.arpa udp
US 8.8.8.8:53 144.107.17.2.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 147.185.221.18:1358 tcp
US 8.8.8.8:53 203.107.17.2.in-addr.arpa udp
US 147.185.221.18:18043 tcp
US 147.185.221.18:1358 tcp
US 147.185.221.18:18043 tcp
US 8.8.8.8:53 udp
N/A 195.201.57.90:443 tcp

Files

memory/636-0-0x00007FFB0E313000-0x00007FFB0E315000-memory.dmp

memory/636-1-0x0000000000230000-0x0000000000554000-memory.dmp

memory/636-2-0x00007FFB0E310000-0x00007FFB0EDD1000-memory.dmp

memory/636-3-0x000000001BD70000-0x000000001BDC0000-memory.dmp

memory/636-4-0x000000001BE80000-0x000000001BF32000-memory.dmp

memory/636-5-0x00007FFB0E313000-0x00007FFB0E315000-memory.dmp

memory/636-6-0x00007FFB0E310000-0x00007FFB0EDD1000-memory.dmp