Malware Analysis Report

2024-10-23 21:24

Sample ID 240804-n6rfbsyfng
Target qqsarbuilder.exe
SHA256 27f1a7bab299f2c36793116723e05be58c6edff36c07ba24a2703903cbdd6048
Tags
office04 quasar 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

27f1a7bab299f2c36793116723e05be58c6edff36c07ba24a2703903cbdd6048

Threat Level: Known bad

The file qqsarbuilder.exe was found to be: Known bad.

Malicious Activity Summary

office04 quasar spyware trojan

Quasar family

Quasar RAT

Quasar payload

Executes dropped EXE

Unsigned PE

Suspicious use of WriteProcessMemory

Uses Task Scheduler COM API

Scheduled Task/Job: Scheduled Task

Suspicious use of AdjustPrivilegeToken

Suspicious use of SetWindowsHookEx

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-08-04 12:00

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

2024-08-04 12:00

Reported

2024-08-04 12:01

Platform

win7-20240704-en

Max time kernel

4s

Max time network

8s

Command Line

"C:\Users\Admin\AppData\Local\Temp\qqsarbuilder.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\windwsupdater.exe N/A

Scheduled Task/Job: Scheduled Task

persistence execution
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\qqsarbuilder.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\SubDir\windwsupdater.exe N/A

Suspicious use of SetWindowsHookEx

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

Uses Task Scheduler COM API

persistence

Processes

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

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

C:\Windows\system32\schtasks.exe

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

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

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

C:\Windows\system32\schtasks.exe

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

Network

Country Destination Domain Proto
N/A 192.168.174.129:4782 tcp

Files

memory/2708-0-0x000007FEF53D3000-0x000007FEF53D4000-memory.dmp

memory/2708-1-0x0000000000FD0000-0x00000000012F4000-memory.dmp

memory/2708-2-0x000007FEF53D0000-0x000007FEF5DBC000-memory.dmp

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

MD5 ea1ab6ce5932a3718821475f19feefea
SHA1 5ab97ce62532976abd93ed2cf56662b8ec15606c
SHA256 27f1a7bab299f2c36793116723e05be58c6edff36c07ba24a2703903cbdd6048
SHA512 e66fa91097b2f725503206bd7e92da486ffd17a9c8fab221387c1d3795e59afedae4fb791b9c530e2e25272a642964e63dc15fe081faed29289c332db8523838

memory/2880-8-0x000007FEF53D0000-0x000007FEF5DBC000-memory.dmp

memory/2708-10-0x000007FEF53D0000-0x000007FEF5DBC000-memory.dmp

memory/2880-9-0x0000000000FC0000-0x00000000012E4000-memory.dmp

memory/2880-11-0x000007FEF53D0000-0x000007FEF5DBC000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-08-04 12:00

Reported

2024-08-04 12:03

Platform

win10v2004-20240802-en

Max time kernel

126s

Max time network

142s

Command Line

"C:\Users\Admin\AppData\Local\Temp\qqsarbuilder.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\windwsupdater.exe N/A

Scheduled Task/Job: Scheduled Task

persistence execution
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\qqsarbuilder.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\SubDir\windwsupdater.exe N/A

Suspicious use of SetWindowsHookEx

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

Uses Task Scheduler COM API

persistence

Processes

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

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

C:\Windows\SYSTEM32\schtasks.exe

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

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

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

C:\Windows\SYSTEM32\schtasks.exe

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

Network

Country Destination Domain Proto
US 8.8.8.8:53 67.31.126.40.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 43.58.199.20.in-addr.arpa udp
N/A 192.168.174.129:4782 tcp
N/A 192.168.174.129:4782 tcp
US 8.8.8.8:53 157.123.68.40.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 217.135.221.88.in-addr.arpa udp
N/A 192.168.174.129:4782 tcp
US 8.8.8.8:53 73.144.22.2.in-addr.arpa udp
N/A 192.168.174.129:4782 tcp
US 8.8.8.8:53 43.229.111.52.in-addr.arpa udp
N/A 192.168.174.129:4782 tcp
N/A 192.168.174.129:4782 tcp

Files

memory/3196-0-0x00007FFA3F993000-0x00007FFA3F995000-memory.dmp

memory/3196-1-0x00000000006C0000-0x00000000009E4000-memory.dmp

memory/3196-2-0x00007FFA3F990000-0x00007FFA40451000-memory.dmp

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

MD5 ea1ab6ce5932a3718821475f19feefea
SHA1 5ab97ce62532976abd93ed2cf56662b8ec15606c
SHA256 27f1a7bab299f2c36793116723e05be58c6edff36c07ba24a2703903cbdd6048
SHA512 e66fa91097b2f725503206bd7e92da486ffd17a9c8fab221387c1d3795e59afedae4fb791b9c530e2e25272a642964e63dc15fe081faed29289c332db8523838

memory/3196-9-0x00007FFA3F990000-0x00007FFA40451000-memory.dmp

memory/2796-10-0x00007FFA3F990000-0x00007FFA40451000-memory.dmp

memory/2796-11-0x00007FFA3F990000-0x00007FFA40451000-memory.dmp

memory/2796-12-0x000000001BD00000-0x000000001BD50000-memory.dmp

memory/2796-13-0x000000001C5A0000-0x000000001C652000-memory.dmp

memory/2796-14-0x00007FFA3F990000-0x00007FFA40451000-memory.dmp