Malware Analysis Report

2025-04-14 04:54

Sample ID 241213-zstjbazpgp
Target Payload.exe
SHA256 ef33af6a7f06d5dae8dd1da0412b795e1222bfd6ce447614c5cac912bcd3374d
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

ef33af6a7f06d5dae8dd1da0412b795e1222bfd6ce447614c5cac912bcd3374d

Threat Level: Known bad

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

Malicious Activity Summary

office04 quasar spyware trojan

Quasar RAT

Quasar family

Quasar payload

Executes dropped EXE

Unsigned PE

Enumerates physical storage devices

Suspicious use of WriteProcessMemory

Scheduled Task/Job: Scheduled Task

Suspicious use of AdjustPrivilegeToken

Suspicious use of FindShellTrayWindow

Uses Task Scheduler COM API

Suspicious use of SetWindowsHookEx

Suspicious use of SendNotifyMessage

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-12-13 20:59

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

2024-12-13 20:59

Reported

2024-12-13 21:01

Platform

win7-20240903-en

Max time kernel

147s

Max time network

147s

Command Line

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

Enumerates physical storage devices

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\Payload.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe N/A

Suspicious use of FindShellTrayWindow

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

Suspicious use of SendNotifyMessage

Description Indicator Process Target
N/A 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\Payload.exe

"C:\Users\Admin\AppData\Local\Temp\Payload.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 ukrainian.zapto.org udp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
US 8.8.8.8:53 ukrainian.zapto.org udp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
US 8.8.8.8:53 ukrainian.zapto.org udp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp

Files

memory/2960-0-0x000007FEF5CD3000-0x000007FEF5CD4000-memory.dmp

memory/2960-1-0x00000000003C0000-0x00000000006E4000-memory.dmp

memory/2960-2-0x000007FEF5CD0000-0x000007FEF66BC000-memory.dmp

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

MD5 b0f4ccdba9627855a58b6f2f1673a3da
SHA1 bb39bbd34084efdf4d0a994fba6419819d68c766
SHA256 ef33af6a7f06d5dae8dd1da0412b795e1222bfd6ce447614c5cac912bcd3374d
SHA512 7af9f641349e406b4d4079580247e72e566ee142028086225b0469ca545e064d365d4aad01d261711b7692a1c0130c7af9f875a56b026d39cb4ed86d2844c2b6

memory/2968-8-0x00000000012F0000-0x0000000001614000-memory.dmp

memory/2968-9-0x000007FEF5CD0000-0x000007FEF66BC000-memory.dmp

memory/2968-10-0x000007FEF5CD0000-0x000007FEF66BC000-memory.dmp

memory/2960-7-0x000007FEF5CD0000-0x000007FEF66BC000-memory.dmp

memory/2968-11-0x000007FEF5CD0000-0x000007FEF66BC000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-12-13 20:59

Reported

2024-12-13 21:01

Platform

win10v2004-20241007-en

Max time kernel

149s

Max time network

151s

Command Line

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

Enumerates physical storage devices

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\Payload.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe N/A

Suspicious use of FindShellTrayWindow

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

Suspicious use of SendNotifyMessage

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

"C:\Users\Admin\AppData\Local\Temp\Payload.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 8.8.8.8:53 241.150.49.20.in-addr.arpa udp
US 8.8.8.8:53 81.144.22.2.in-addr.arpa udp
US 8.8.8.8:53 4.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 ukrainian.zapto.org udp
FR 51.91.146.93:5552 ukrainian.zapto.org tcp
US 8.8.8.8:53 ipwho.is udp
DE 195.201.57.90:443 ipwho.is tcp
US 8.8.8.8:53 93.146.91.51.in-addr.arpa udp
US 8.8.8.8:53 90.57.201.195.in-addr.arpa udp
US 8.8.8.8:53 104.219.191.52.in-addr.arpa udp
US 8.8.8.8:53 53.210.109.20.in-addr.arpa udp
US 8.8.8.8:53 198.187.3.20.in-addr.arpa udp
US 8.8.8.8:53 107.12.20.2.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
US 8.8.8.8:53 23.236.111.52.in-addr.arpa udp

Files

memory/2052-0-0x00007FFA2AAA3000-0x00007FFA2AAA5000-memory.dmp

memory/2052-1-0x0000000000690000-0x00000000009B4000-memory.dmp

memory/2052-2-0x00007FFA2AAA0000-0x00007FFA2B561000-memory.dmp

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

MD5 b0f4ccdba9627855a58b6f2f1673a3da
SHA1 bb39bbd34084efdf4d0a994fba6419819d68c766
SHA256 ef33af6a7f06d5dae8dd1da0412b795e1222bfd6ce447614c5cac912bcd3374d
SHA512 7af9f641349e406b4d4079580247e72e566ee142028086225b0469ca545e064d365d4aad01d261711b7692a1c0130c7af9f875a56b026d39cb4ed86d2844c2b6

memory/2052-8-0x00007FFA2AAA0000-0x00007FFA2B561000-memory.dmp

memory/3284-9-0x00007FFA2AAA0000-0x00007FFA2B561000-memory.dmp

memory/3284-10-0x00007FFA2AAA0000-0x00007FFA2B561000-memory.dmp

memory/3284-11-0x000000001DE70000-0x000000001DEC0000-memory.dmp

memory/3284-12-0x000000001DF80000-0x000000001E032000-memory.dmp

memory/3284-15-0x000000001DF00000-0x000000001DF12000-memory.dmp

memory/3284-16-0x000000001E780000-0x000000001E7BC000-memory.dmp

memory/3284-17-0x00007FFA2AAA0000-0x00007FFA2B561000-memory.dmp