Malware Analysis Report

2025-04-13 12:14

Sample ID 240330-v76pzaag4w
Target Quasar.exe
SHA256 43315abb9c8be9a39782bd8694a7ea9f16a867500dc804454d04b8bf2c15c51e
Tags
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

43315abb9c8be9a39782bd8694a7ea9f16a867500dc804454d04b8bf2c15c51e

Threat Level: Known bad

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

Malicious Activity Summary

quasar spyware trojan

Quasar family

Quasar payload

Quasar RAT

Unsigned PE

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

MITRE ATT&CK

N/A

Analysis: static1

Detonation Overview

Reported

2024-03-30 17:38

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

2024-03-30 17:38

Reported

2024-03-30 17:41

Platform

win7-20240221-en

Max time kernel

126s

Max time network

121s

Command Line

"C:\Users\Admin\AppData\Local\Temp\Quasar.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

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\Quasar.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2848 wrote to memory of 3016 N/A C:\Users\Admin\AppData\Local\Temp\Quasar.exe C:\Windows\system32\WerFault.exe
PID 2848 wrote to memory of 3016 N/A C:\Users\Admin\AppData\Local\Temp\Quasar.exe C:\Windows\system32\WerFault.exe
PID 2848 wrote to memory of 3016 N/A C:\Users\Admin\AppData\Local\Temp\Quasar.exe C:\Windows\system32\WerFault.exe

Processes

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

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

C:\Windows\system32\WerFault.exe

C:\Windows\system32\WerFault.exe -u -p 2848 -s 588

Network

N/A

Files

memory/2848-0-0x0000000000CD0000-0x0000000000E08000-memory.dmp

memory/2848-1-0x000007FEF5D30000-0x000007FEF671C000-memory.dmp

memory/2848-2-0x000000001B400000-0x000000001B480000-memory.dmp

memory/2848-3-0x000007FEF5D30000-0x000007FEF671C000-memory.dmp

memory/2848-4-0x000000001B400000-0x000000001B480000-memory.dmp

memory/2848-5-0x000007FEF5D30000-0x000007FEF671C000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-03-30 17:38

Reported

2024-03-30 17:41

Platform

win10v2004-20240226-en

Max time kernel

113s

Max time network

122s

Command Line

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

Signatures

Quasar RAT

trojan spyware quasar

Quasar payload

Description Indicator Process Target
N/A N/A N/A N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\Quasar.exe N/A

Processes

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

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

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe

"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=4168 --field-trial-handle=2276,i,5697607538120380977,9987005253899555344,262144 --variations-seed-version /prefetch:8

Network

Country Destination Domain Proto
US 8.8.8.8:53 133.211.185.52.in-addr.arpa udp
US 8.8.8.8:53 240.221.184.93.in-addr.arpa udp
US 8.8.8.8:53 6.181.190.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 217.106.137.52.in-addr.arpa udp
GB 142.250.187.234:443 tcp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
US 8.8.8.8:53 157.123.68.40.in-addr.arpa udp
US 8.8.8.8:53 217.135.221.88.in-addr.arpa udp
US 8.8.8.8:53 22.236.111.52.in-addr.arpa udp

Files

memory/1824-0-0x000001F6F41A0000-0x000001F6F42D8000-memory.dmp

memory/1824-1-0x00007FF970E00000-0x00007FF9718C1000-memory.dmp

memory/1824-2-0x000001F6F6200000-0x000001F6F6210000-memory.dmp

memory/1824-3-0x00007FF970E00000-0x00007FF9718C1000-memory.dmp