Malware Analysis Report

2024-10-23 21:28

Sample ID 240410-nebwkadg28
Target Client-built.exe
SHA256 bf4b331a3329acc0925ed37d55dc9ff54934eeaa30547e4221ae8c10aa5b1658
Tags
quasar office04 spyware trojan
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

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

bf4b331a3329acc0925ed37d55dc9ff54934eeaa30547e4221ae8c10aa5b1658

Threat Level: Known bad

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

Malicious Activity Summary

quasar office04 spyware trojan

Quasar family

Quasar RAT

Quasar payload

Executes dropped EXE

Unsigned PE

Creates scheduled task(s)

Uses Task Scheduler COM API

Suspicious use of AdjustPrivilegeToken

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-04-10 11:18

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

2024-04-10 11:18

Reported

2024-04-10 11:20

Platform

win7-20240221-en

Max time kernel

129s

Max time network

143s

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

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 SetWindowsHookEx

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

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 192.168.0.115:4782 tcp
N/A 192.168.0.115:4782 tcp
N/A 192.168.0.115:4782 tcp
N/A 192.168.0.115:4782 tcp
N/A 192.168.0.115:4782 tcp
N/A 192.168.0.115:4782 tcp

Files

memory/3012-0-0x0000000000C00000-0x0000000000F24000-memory.dmp

memory/3012-1-0x000007FEF5D30000-0x000007FEF671C000-memory.dmp

memory/3012-2-0x000000001B0D0000-0x000000001B150000-memory.dmp

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

MD5 23aaf5e0d106b0f8ce7b98ebb248fa35
SHA1 898101610b796f5d50de183a04ff029dbc6be064
SHA256 bf4b331a3329acc0925ed37d55dc9ff54934eeaa30547e4221ae8c10aa5b1658
SHA512 d1d88cbe426ee916cd4f64aa2dd1a6efd1ab223c7e7d191feb4d2653b6886f8bf1cbf5e07184e3854571575e0b10da6ed016efd61c5c3e5f9bcde865e03b2b40

memory/2556-7-0x0000000000D70000-0x0000000001094000-memory.dmp

memory/2556-8-0x000007FEF5D30000-0x000007FEF671C000-memory.dmp

memory/2556-9-0x000000001B2F0000-0x000000001B370000-memory.dmp

memory/3012-10-0x000007FEF5D30000-0x000007FEF671C000-memory.dmp

memory/2556-11-0x000007FEF5D30000-0x000007FEF671C000-memory.dmp

memory/2556-12-0x000000001B2F0000-0x000000001B370000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-04-10 11:18

Reported

2024-04-10 11:20

Platform

win10v2004-20240226-en

Max time kernel

149s

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

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 SetWindowsHookEx

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

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
US 8.8.8.8:53 97.17.167.52.in-addr.arpa udp
US 8.8.8.8:53 0.204.248.87.in-addr.arpa udp
N/A 192.168.0.115:4782 tcp
US 8.8.8.8:53 23.159.190.20.in-addr.arpa udp
N/A 192.168.0.115:4782 tcp
US 8.8.8.8:53 86.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 17.14.97.104.in-addr.arpa udp
NL 52.142.223.178:80 tcp
N/A 192.168.0.115:4782 tcp
US 8.8.8.8:53 249.197.17.2.in-addr.arpa udp
N/A 192.168.0.115:4782 tcp
US 8.8.8.8:53 240.221.184.93.in-addr.arpa udp
US 8.8.8.8:53 31.243.111.52.in-addr.arpa udp
N/A 192.168.0.115:4782 tcp
N/A 192.168.0.115:4782 tcp
N/A 192.168.0.115:4782 tcp

Files

memory/752-0-0x0000000000900000-0x0000000000C24000-memory.dmp

memory/752-1-0x00007FFD292A0000-0x00007FFD29D61000-memory.dmp

memory/752-2-0x0000000001540000-0x0000000001550000-memory.dmp

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

MD5 23aaf5e0d106b0f8ce7b98ebb248fa35
SHA1 898101610b796f5d50de183a04ff029dbc6be064
SHA256 bf4b331a3329acc0925ed37d55dc9ff54934eeaa30547e4221ae8c10aa5b1658
SHA512 d1d88cbe426ee916cd4f64aa2dd1a6efd1ab223c7e7d191feb4d2653b6886f8bf1cbf5e07184e3854571575e0b10da6ed016efd61c5c3e5f9bcde865e03b2b40

memory/752-8-0x00007FFD292A0000-0x00007FFD29D61000-memory.dmp

memory/980-9-0x00007FFD292A0000-0x00007FFD29D61000-memory.dmp

memory/980-10-0x000000001BA10000-0x000000001BA20000-memory.dmp

memory/980-11-0x000000001C160000-0x000000001C1B0000-memory.dmp

memory/980-12-0x000000001C270000-0x000000001C322000-memory.dmp

memory/980-13-0x00007FFD292A0000-0x00007FFD29D61000-memory.dmp

memory/980-14-0x000000001BA10000-0x000000001BA20000-memory.dmp