Malware Analysis Report

2025-01-18 04:09

Sample ID 241102-fjl84a1kcq
Target Pearjumper.exe
SHA256 e2ba71624ae6ac3f80fbb474079bda5827244925eff77919760367d1622607ff
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: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

e2ba71624ae6ac3f80fbb474079bda5827244925eff77919760367d1622607ff

Threat Level: Known bad

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

Malicious Activity Summary

quasar office04 spyware trojan

Quasar payload

Quasar RAT

Quasar family

Executes dropped EXE

Unsigned PE

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

Scheduled Task/Job: Scheduled Task

Suspicious use of AdjustPrivilegeToken

Uses Task Scheduler COM API

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-11-02 04:54

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: behavioral2

Detonation Overview

Submitted

2024-11-02 04:54

Reported

2024-11-02 04:54

Platform

win10v2004-20241007-en

Max time kernel

8s

Max time network

8s

Command Line

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

Signatures

Quasar RAT

trojan spyware quasar

Quasar family

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

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\Pearjumper.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\Pearjumper.exe

"C:\Users\Admin\AppData\Local\Temp\Pearjumper.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 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 228.249.119.40.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 23.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 55.36.223.20.in-addr.arpa udp
N/A 192.168.4.26:4782 tcp

Files

memory/3952-0-0x00007FFD99B73000-0x00007FFD99B75000-memory.dmp

memory/3952-1-0x0000000000250000-0x0000000000574000-memory.dmp

memory/3952-2-0x00007FFD99B70000-0x00007FFD9A631000-memory.dmp

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

MD5 5dd91af5b6d1e8f38ccf83f6cf24e93d
SHA1 978d27dfe11619fbd71333d63741da0b3a21b7d2
SHA256 e2ba71624ae6ac3f80fbb474079bda5827244925eff77919760367d1622607ff
SHA512 6b6e61f8419e234eeb233eeb0f402434f5905492831588a3a488caf02ca9a60bc21a4b94acf7982d3dc533afe801341220a51d1fb33bc14dcc1cca1c44f8c03b

memory/3952-10-0x00007FFD99B70000-0x00007FFD9A631000-memory.dmp

memory/4432-9-0x00007FFD99B70000-0x00007FFD9A631000-memory.dmp

memory/4432-11-0x00007FFD99B70000-0x00007FFD9A631000-memory.dmp

memory/4432-12-0x0000000002F10000-0x0000000002F60000-memory.dmp

memory/4432-13-0x000000001C1F0000-0x000000001C2A2000-memory.dmp

Analysis: behavioral1

Detonation Overview

Submitted

2024-11-02 04:54

Reported

2024-11-02 04:57

Platform

win7-20240903-en

Max time kernel

149s

Max time network

149s

Command Line

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

Signatures

Quasar RAT

trojan spyware quasar

Quasar family

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

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\Pearjumper.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\Pearjumper.exe

"C:\Users\Admin\AppData\Local\Temp\Pearjumper.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 192.168.4.26:4782 tcp
N/A 192.168.4.26:4782 tcp
N/A 192.168.4.26:4782 tcp
N/A 192.168.4.26:4782 tcp
N/A 192.168.4.26:4782 tcp
N/A 192.168.4.26:4782 tcp
N/A 192.168.4.26:4782 tcp

Files

memory/2936-0-0x000007FEF57F3000-0x000007FEF57F4000-memory.dmp

memory/2936-1-0x0000000000150000-0x0000000000474000-memory.dmp

memory/2936-2-0x000007FEF57F0000-0x000007FEF61DC000-memory.dmp

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

MD5 5dd91af5b6d1e8f38ccf83f6cf24e93d
SHA1 978d27dfe11619fbd71333d63741da0b3a21b7d2
SHA256 e2ba71624ae6ac3f80fbb474079bda5827244925eff77919760367d1622607ff
SHA512 6b6e61f8419e234eeb233eeb0f402434f5905492831588a3a488caf02ca9a60bc21a4b94acf7982d3dc533afe801341220a51d1fb33bc14dcc1cca1c44f8c03b

memory/2804-8-0x000007FEF57F0000-0x000007FEF61DC000-memory.dmp

memory/2936-10-0x000007FEF57F0000-0x000007FEF61DC000-memory.dmp

memory/2804-9-0x0000000000DF0000-0x0000000001114000-memory.dmp

memory/2804-11-0x000007FEF57F0000-0x000007FEF61DC000-memory.dmp

memory/2804-12-0x000007FEF57F0000-0x000007FEF61DC000-memory.dmp