Malware Analysis Report

2024-10-23 21:24

Sample ID 240804-a2bx7avgqh
Target Client-built.exe
SHA256 0fff45906cb1259652e8488ce8b7ce888a63c97332d9e3c7eb93b4c2aac1ea38
Tags
office04 quasar spyware trojan
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

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

0fff45906cb1259652e8488ce8b7ce888a63c97332d9e3c7eb93b4c2aac1ea38

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 RAT

Quasar family

Executes dropped EXE

Unsigned PE

Suspicious use of AdjustPrivilegeToken

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

MITRE ATT&CK

N/A

Analysis: static1

Detonation Overview

Reported

2024-08-04 00:42

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 00:42

Reported

2024-08-04 00:44

Platform

win7-20240705-en

Max time kernel

148s

Max time network

123s

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

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

Processes

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

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

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

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

Network

Country Destination Domain Proto
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp

Files

memory/3028-0-0x000007FEF5BD3000-0x000007FEF5BD4000-memory.dmp

memory/3028-1-0x0000000001380000-0x00000000016A4000-memory.dmp

memory/3028-2-0x000007FEF5BD0000-0x000007FEF65BC000-memory.dmp

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

MD5 94050f9434efcd579e1be0f1698dc4be
SHA1 b1f9f9bb740805af70d91fd8dc16034fe6108b86
SHA256 0fff45906cb1259652e8488ce8b7ce888a63c97332d9e3c7eb93b4c2aac1ea38
SHA512 ed580833c456aafdd84871883f9bd2820e9c6a07e3402f69d5c632498491dba399c6e2464ef9379c944e7a4859ed634803d348d9ea24beb27d8dec47b64c09ad

memory/316-7-0x000007FEF5BD0000-0x000007FEF65BC000-memory.dmp

memory/316-9-0x0000000000D00000-0x0000000001024000-memory.dmp

memory/3028-8-0x000007FEF5BD0000-0x000007FEF65BC000-memory.dmp

memory/316-10-0x000007FEF5BD0000-0x000007FEF65BC000-memory.dmp

memory/316-11-0x000007FEF5BD0000-0x000007FEF65BC000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-08-04 00:42

Reported

2024-08-04 00:44

Platform

win10v2004-20240802-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
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

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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 4396 wrote to memory of 1576 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
PID 4396 wrote to memory of 1576 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Processes

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

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

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

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

Network

Country Destination Domain Proto
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 8.8.8.8:53 237.21.107.13.in-addr.arpa udp
US 8.8.8.8:53 68.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 73.144.22.2.in-addr.arpa udp
US 8.8.8.8:53 57.169.31.20.in-addr.arpa udp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
US 8.8.8.8:53 183.59.114.20.in-addr.arpa udp
N/A 127.0.0.1:80 tcp
US 8.8.8.8:53 206.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 59.170.16.2.in-addr.arpa udp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
US 8.8.8.8:53 43.229.111.52.in-addr.arpa udp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
N/A 127.0.0.1:80 tcp
US 8.8.8.8:53 195.201.50.20.in-addr.arpa udp

Files

memory/4396-0-0x00007FFA82CB3000-0x00007FFA82CB5000-memory.dmp

memory/4396-1-0x0000000000440000-0x0000000000764000-memory.dmp

memory/4396-2-0x00007FFA82CB0000-0x00007FFA83771000-memory.dmp

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

MD5 94050f9434efcd579e1be0f1698dc4be
SHA1 b1f9f9bb740805af70d91fd8dc16034fe6108b86
SHA256 0fff45906cb1259652e8488ce8b7ce888a63c97332d9e3c7eb93b4c2aac1ea38
SHA512 ed580833c456aafdd84871883f9bd2820e9c6a07e3402f69d5c632498491dba399c6e2464ef9379c944e7a4859ed634803d348d9ea24beb27d8dec47b64c09ad

memory/4396-9-0x00007FFA82CB0000-0x00007FFA83771000-memory.dmp

memory/1576-8-0x00007FFA82CB0000-0x00007FFA83771000-memory.dmp

memory/1576-10-0x00007FFA82CB0000-0x00007FFA83771000-memory.dmp

memory/1576-11-0x0000000002A70000-0x0000000002AC0000-memory.dmp

memory/1576-12-0x000000001B480000-0x000000001B532000-memory.dmp

memory/1576-13-0x00007FFA82CB0000-0x00007FFA83771000-memory.dmp