Malware Analysis Report

2025-04-14 04:54

Sample ID 241212-t8ahgssldq
Target full.exe
SHA256 e32128f875d42818741d274d447aacf2cdc15cc78a2ce0a393d629c4c90c779d
Tags
quasar office04 discovery execution persistence 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

e32128f875d42818741d274d447aacf2cdc15cc78a2ce0a393d629c4c90c779d

Threat Level: Known bad

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

Malicious Activity Summary

quasar office04 discovery execution persistence spyware trojan

Quasar RAT

Quasar payload

Quasar family

Legitimate hosting services abused for malware hosting/C2

Adds Run key to start application

Suspicious use of SetThreadContext

System Location Discovery: System Language Discovery

Command and Scripting Interpreter: PowerShell

Unsigned PE

Modifies system certificate store

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

Suspicious behavior: EnumeratesProcesses

Modifies registry key

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-12-12 16:43

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-12-12 16:43

Reported

2024-12-12 16:45

Platform

win7-20240729-en

Max time kernel

119s

Max time network

120s

Command Line

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

Signatures

N/A

Processes

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

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

Network

N/A

Files

N/A

Analysis: behavioral2

Detonation Overview

Submitted

2024-12-12 16:43

Reported

2024-12-12 16:45

Platform

win10v2004-20241007-en

Max time kernel

149s

Max time network

151s

Command Line

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

Signatures

Quasar RAT

trojan spyware quasar

Quasar family

quasar

Quasar payload

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

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-4050598569-1597076380-177084960-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\AdobePS1\ = "powershell -ExecutionPolicy Bypass -File \"C:\\Users\\Admin\\AppData\\Local\\Temp\\Adobe.ps1\"" C:\Windows\system32\reg.exe N/A

Legitimate hosting services abused for malware hosting/C2

Description Indicator Process Target
N/A 1.tcp.sa.ngrok.io N/A N/A

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 2904 set thread context of 3892 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe

Command and Scripting Interpreter: PowerShell

execution
Description Indicator Process Target
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe N/A

Modifies registry key

Description Indicator Process Target
N/A N/A C:\Windows\system32\reg.exe N/A

Modifies system certificate store

evasion spyware trojan
Description Indicator Process Target
Set value (data) \REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\B1BC968BD4F49D622AA89A81F2150152A41D829C\Blob = 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 C:\Users\Admin\AppData\Local\Temp\full.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\B1BC968BD4F49D622AA89A81F2150152A41D829C C:\Users\Admin\AppData\Local\Temp\full.exe N/A
Set value (data) \REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\B1BC968BD4F49D622AA89A81F2150152A41D829C\Blob = 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 C:\Users\Admin\AppData\Local\Temp\full.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 4636 wrote to memory of 2448 N/A C:\Users\Admin\AppData\Local\Temp\full.exe C:\Windows\system32\reg.exe
PID 4636 wrote to memory of 2448 N/A C:\Users\Admin\AppData\Local\Temp\full.exe C:\Windows\system32\reg.exe
PID 4636 wrote to memory of 2904 N/A C:\Users\Admin\AppData\Local\Temp\full.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 4636 wrote to memory of 2904 N/A C:\Users\Admin\AppData\Local\Temp\full.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 2904 wrote to memory of 3892 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe
PID 2904 wrote to memory of 3892 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe
PID 2904 wrote to memory of 3892 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe
PID 2904 wrote to memory of 3892 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe
PID 2904 wrote to memory of 3892 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe
PID 2904 wrote to memory of 3892 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe
PID 2904 wrote to memory of 3892 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe
PID 2904 wrote to memory of 3892 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe

Processes

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

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

C:\Windows\system32\reg.exe

reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Run\AdobePS1 /t REG_SZ /d "powershell -ExecutionPolicy Bypass -File \"C:\Users\Admin\AppData\Local\Temp\Adobe.ps1\"" /f

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe

powershell -ExecutionPolicy Bypass -File C:\Users\Admin\AppData\Local\Temp\Adobe.ps1

C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe

"C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 firebasestorage.googleapis.com udp
FR 142.250.201.170:443 firebasestorage.googleapis.com tcp
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 232.168.11.51.in-addr.arpa udp
US 8.8.8.8:53 88.210.23.2.in-addr.arpa udp
US 8.8.8.8:53 170.201.250.142.in-addr.arpa udp
US 8.8.8.8:53 68.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 1.tcp.sa.ngrok.io udp
BR 15.229.188.194:20545 1.tcp.sa.ngrok.io 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 83.210.23.2.in-addr.arpa udp
US 8.8.8.8:53 90.57.201.195.in-addr.arpa udp
US 8.8.8.8:53 133.211.185.52.in-addr.arpa udp
US 8.8.8.8:53 212.20.149.52.in-addr.arpa udp
US 8.8.8.8:53 198.187.3.20.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 21.125.209.23.in-addr.arpa udp
US 8.8.8.8:53 85.49.80.91.in-addr.arpa udp
US 8.8.8.8:53 11.227.111.52.in-addr.arpa udp
US 8.8.8.8:53 13.173.189.20.in-addr.arpa udp

Files

memory/2904-1-0x00007FF9878F3000-0x00007FF9878F5000-memory.dmp

memory/2904-2-0x000001A4379E0000-0x000001A437A02000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_klkz1mc2.lwx.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/2904-13-0x00007FF9878F0000-0x00007FF9883B1000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\Adobe.ps1

MD5 90a005927b1d759d4dd93e4721a93585
SHA1 30c42c6bcccc8ce4efd56ae8d7a88bf15023e60b
SHA256 590f970e72e38b034eccb2839f763954258d6bf237aa087f31ff4f3951e07d15
SHA512 cc9f478e9111d5a9b55041a9689232de2f3f6c7299eece438aef3cbd3d5d62441cf658f3e36c7401bf21b60f8670f03a695ef5a08b6d6945fe4bcb38a6be4aea

memory/2904-14-0x00007FF9878F0000-0x00007FF9883B1000-memory.dmp

memory/2904-15-0x000001A452070000-0x000001A452080000-memory.dmp

memory/3892-16-0x0000000000400000-0x0000000000724000-memory.dmp

memory/2904-19-0x00007FF9878F0000-0x00007FF9883B1000-memory.dmp

memory/3892-20-0x000000007531E000-0x000000007531F000-memory.dmp

memory/3892-21-0x0000000005EE0000-0x0000000006484000-memory.dmp

memory/3892-22-0x0000000005930000-0x00000000059C2000-memory.dmp

memory/3892-23-0x0000000075310000-0x0000000075AC0000-memory.dmp

memory/3892-24-0x00000000058C0000-0x00000000058CA000-memory.dmp

memory/3892-25-0x0000000006AB0000-0x00000000070C8000-memory.dmp

memory/3892-26-0x0000000005DB0000-0x0000000005E00000-memory.dmp

memory/3892-27-0x00000000065D0000-0x0000000006682000-memory.dmp

memory/3892-30-0x00000000078D0000-0x00000000078E2000-memory.dmp

memory/3892-31-0x0000000007930000-0x000000000796C000-memory.dmp

memory/3892-32-0x00000000079E0000-0x0000000007A46000-memory.dmp

memory/3892-33-0x000000007531E000-0x000000007531F000-memory.dmp

memory/3892-34-0x0000000075310000-0x0000000075AC0000-memory.dmp