Malware Analysis Report

2025-01-18 04:11

Sample ID 241102-rl11tawlfw
Target Pearjumper.exe
SHA256 e2ba71624ae6ac3f80fbb474079bda5827244925eff77919760367d1622607ff
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

e2ba71624ae6ac3f80fbb474079bda5827244925eff77919760367d1622607ff

Threat Level: Known bad

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

Malicious Activity Summary

office04 quasar spyware trojan

Quasar family

Quasar payload

Quasar RAT

Executes dropped EXE

Unsigned PE

Scheduled Task/Job: Scheduled Task

Suspicious use of WriteProcessMemory

Uses Task Scheduler COM API

Suspicious use of AdjustPrivilegeToken

Suspicious use of SetWindowsHookEx

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-11-02 14:17

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

2024-11-02 14:17

Reported

2024-11-02 14:18

Platform

win7-20241010-en

Max time kernel

32s

Max time network

36s

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

Files

memory/2024-0-0x000007FEF5833000-0x000007FEF5834000-memory.dmp

memory/2024-1-0x0000000000150000-0x0000000000474000-memory.dmp

memory/2024-2-0x000007FEF5830000-0x000007FEF621C000-memory.dmp

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

MD5 5dd91af5b6d1e8f38ccf83f6cf24e93d
SHA1 978d27dfe11619fbd71333d63741da0b3a21b7d2
SHA256 e2ba71624ae6ac3f80fbb474079bda5827244925eff77919760367d1622607ff
SHA512 6b6e61f8419e234eeb233eeb0f402434f5905492831588a3a488caf02ca9a60bc21a4b94acf7982d3dc533afe801341220a51d1fb33bc14dcc1cca1c44f8c03b

memory/2884-9-0x00000000012C0000-0x00000000015E4000-memory.dmp

memory/2024-8-0x000007FEF5830000-0x000007FEF621C000-memory.dmp

memory/2884-10-0x000007FEF5830000-0x000007FEF621C000-memory.dmp

memory/2884-11-0x000007FEF5830000-0x000007FEF621C000-memory.dmp

memory/2884-12-0x000007FEF5830000-0x000007FEF621C000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-11-02 14:17

Reported

2024-11-02 14:18

Platform

win10v2004-20241007-en

Max time kernel

36s

Max time network

43s

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 58.55.71.13.in-addr.arpa udp
N/A 192.168.4.26:4782 tcp
US 8.8.8.8:53 g.bing.com udp
US 150.171.27.10:443 g.bing.com tcp
US 8.8.8.8:53 69.31.126.40.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 241.150.49.20.in-addr.arpa udp
N/A 192.168.4.26:4782 tcp
US 8.8.8.8:53 53.210.109.20.in-addr.arpa udp
US 8.8.8.8:53 206.23.85.13.in-addr.arpa udp

Files

memory/2904-0-0x00007FFB52293000-0x00007FFB52295000-memory.dmp

memory/2904-1-0x0000000000960000-0x0000000000C84000-memory.dmp

memory/2904-2-0x00007FFB52290000-0x00007FFB52D51000-memory.dmp

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

MD5 5dd91af5b6d1e8f38ccf83f6cf24e93d
SHA1 978d27dfe11619fbd71333d63741da0b3a21b7d2
SHA256 e2ba71624ae6ac3f80fbb474079bda5827244925eff77919760367d1622607ff
SHA512 6b6e61f8419e234eeb233eeb0f402434f5905492831588a3a488caf02ca9a60bc21a4b94acf7982d3dc533afe801341220a51d1fb33bc14dcc1cca1c44f8c03b

memory/208-10-0x00007FFB52290000-0x00007FFB52D51000-memory.dmp

memory/2904-9-0x00007FFB52290000-0x00007FFB52D51000-memory.dmp

memory/208-11-0x00007FFB52290000-0x00007FFB52D51000-memory.dmp

memory/208-12-0x000000001B2D0000-0x000000001B320000-memory.dmp

memory/208-13-0x000000001BB10000-0x000000001BBC2000-memory.dmp

memory/208-14-0x00007FFB52290000-0x00007FFB52D51000-memory.dmp