Malware Analysis Report

2024-08-06 11:11

Sample ID 240614-nccebasarn
Target Client-built.exe
SHA256 40f98d7fbfe7b67d42dd7283eac6a78772d11fd15b7417ad87668ede8b720d10
Tags
office04 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

40f98d7fbfe7b67d42dd7283eac6a78772d11fd15b7417ad87668ede8b720d10

Threat Level: Known bad

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

Malicious Activity Summary

office04 quasar spyware trojan

Quasar payload

Quasar family

Quasar RAT

Executes dropped EXE

Unsigned PE

Enumerates physical storage devices

Uses Task Scheduler COM API

Suspicious use of SetWindowsHookEx

Suspicious use of SendNotifyMessage

Suspicious use of WriteProcessMemory

Creates scheduled task(s)

Suspicious use of FindShellTrayWindow

Suspicious use of AdjustPrivilegeToken

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

2024-06-14 11:14

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

2024-06-14 11:14

Reported

2024-06-14 11:18

Platform

win7-20240611-en

Max time kernel

199s

Max time network

210s

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:\Users\Admin\AppData\Roaming\SubDir\Client.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:\Users\Admin\AppData\Roaming\SubDir\Client.exe N/A

Suspicious use of FindShellTrayWindow

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe N/A

Suspicious use of SendNotifyMessage

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 772 wrote to memory of 1876 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\system32\schtasks.exe
PID 772 wrote to memory of 1876 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\system32\schtasks.exe
PID 772 wrote to memory of 1876 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\system32\schtasks.exe
PID 772 wrote to memory of 2404 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
PID 772 wrote to memory of 2404 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
PID 772 wrote to memory of 2404 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
PID 2404 wrote to memory of 2772 N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe C:\Windows\system32\schtasks.exe
PID 2404 wrote to memory of 2772 N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe C:\Windows\system32\schtasks.exe
PID 2404 wrote to memory of 2772 N/A C:\Users\Admin\AppData\Roaming\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 "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"

C:\Windows\system32\schtasks.exe

"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f

Network

Country Destination Domain Proto
N/A 192.168.1.61:4782 tcp
N/A 192.168.1.61:4782 tcp
N/A 192.168.1.61:4782 tcp
N/A 192.168.1.61:4782 tcp
N/A 192.168.1.61:4782 tcp
N/A 192.168.1.61:4782 tcp
N/A 192.168.1.61:4782 tcp
N/A 192.168.1.61:4782 tcp
N/A 192.168.1.61:4782 tcp

Files

memory/772-0-0x000007FEF5D03000-0x000007FEF5D04000-memory.dmp

memory/772-1-0x0000000000870000-0x0000000000B94000-memory.dmp

memory/772-2-0x000007FEF5D00000-0x000007FEF66EC000-memory.dmp

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

MD5 f4b998836fb1b6c39db4595d5c84f695
SHA1 4f16db34da13190ca66c425f41611d4feec2ad5a
SHA256 40f98d7fbfe7b67d42dd7283eac6a78772d11fd15b7417ad87668ede8b720d10
SHA512 40e742bc94e39dfecfb3a345b7e2cb79d95e5055bac8041618b440b2ca0a179f2b7be78ac428a162ceda7e0ad1ecd176558735728e4fd5142b189a7ccbd927c8

memory/2404-8-0x000007FEF5D00000-0x000007FEF66EC000-memory.dmp

memory/2404-9-0x0000000001140000-0x0000000001464000-memory.dmp

memory/2404-11-0x000007FEF5D00000-0x000007FEF66EC000-memory.dmp

memory/772-10-0x000007FEF5D00000-0x000007FEF66EC000-memory.dmp

memory/2404-12-0x000007FEF5D00000-0x000007FEF66EC000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-06-14 11:14

Reported

2024-06-14 11:17

Platform

win10v2004-20240508-en

Max time kernel

126s

Max time network

142s

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:\Users\Admin\AppData\Roaming\SubDir\Client.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:\Users\Admin\AppData\Roaming\SubDir\Client.exe N/A

Suspicious use of FindShellTrayWindow

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe N/A

Suspicious use of SendNotifyMessage

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 4164 wrote to memory of 4792 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\SYSTEM32\schtasks.exe
PID 4164 wrote to memory of 4792 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\SYSTEM32\schtasks.exe
PID 4164 wrote to memory of 3492 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
PID 4164 wrote to memory of 3492 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
PID 3492 wrote to memory of 664 N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe C:\Windows\SYSTEM32\schtasks.exe
PID 3492 wrote to memory of 664 N/A C:\Users\Admin\AppData\Roaming\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 "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"

C:\Windows\SYSTEM32\schtasks.exe

"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f

Network

Country Destination Domain Proto
N/A 192.168.1.61:4782 tcp
N/A 192.168.1.61:4782 tcp
N/A 192.168.1.61:4782 tcp
N/A 192.168.1.61:4782 tcp
N/A 192.168.1.61:4782 tcp
N/A 192.168.1.61:4782 tcp

Files

memory/4164-0-0x00007FF816413000-0x00007FF816415000-memory.dmp

memory/4164-1-0x00000000002E0000-0x0000000000604000-memory.dmp

memory/4164-2-0x00007FF816410000-0x00007FF816ED1000-memory.dmp

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

MD5 f4b998836fb1b6c39db4595d5c84f695
SHA1 4f16db34da13190ca66c425f41611d4feec2ad5a
SHA256 40f98d7fbfe7b67d42dd7283eac6a78772d11fd15b7417ad87668ede8b720d10
SHA512 40e742bc94e39dfecfb3a345b7e2cb79d95e5055bac8041618b440b2ca0a179f2b7be78ac428a162ceda7e0ad1ecd176558735728e4fd5142b189a7ccbd927c8

memory/4164-10-0x00007FF816410000-0x00007FF816ED1000-memory.dmp

memory/3492-9-0x00007FF816410000-0x00007FF816ED1000-memory.dmp

memory/3492-11-0x00007FF816410000-0x00007FF816ED1000-memory.dmp

memory/3492-12-0x000000001C710000-0x000000001C760000-memory.dmp

memory/3492-13-0x000000001C820000-0x000000001C8D2000-memory.dmp

memory/3492-14-0x00007FF816410000-0x00007FF816ED1000-memory.dmp