Malware Analysis Report

2025-08-05 23:41

Sample ID 250108-hz1grsyrgv
Target 4c7a86733a4ac849eec1b49179f64b81ed852c47be714d91c3b00d64b79e1399N.exe
SHA256 4c7a86733a4ac849eec1b49179f64b81ed852c47be714d91c3b00d64b79e1399
Tags
quasar 2026 discovery 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

4c7a86733a4ac849eec1b49179f64b81ed852c47be714d91c3b00d64b79e1399

Threat Level: Known bad

The file 4c7a86733a4ac849eec1b49179f64b81ed852c47be714d91c3b00d64b79e1399N.exe was found to be: Known bad.

Malicious Activity Summary

quasar 2026 discovery spyware trojan

Quasar payload

Quasar family

Quasar RAT

Downloads MZ/PE file

Checks computer location settings

Executes dropped EXE

Loads dropped DLL

Suspicious use of SetThreadContext

Unsigned PE

System Location Discovery: System Language Discovery

Enumerates physical storage devices

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

Suspicious behavior: EnumeratesProcesses

Suspicious use of SetWindowsHookEx

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2025-01-08 07:11

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2025-01-08 07:11

Reported

2025-01-08 07:13

Platform

win7-20241010-en

Max time kernel

117s

Max time network

123s

Command Line

"C:\Users\Admin\AppData\Local\Temp\4c7a86733a4ac849eec1b49179f64b81ed852c47be714d91c3b00d64b79e1399N.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
N/A N/A N/A N/A
N/A N/A N/A N/A

Downloads MZ/PE file

Executes dropped EXE

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

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 844 set thread context of 2928 N/A C:\Users\Admin\AppData\Local\Temp\c.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe

Enumerates physical storage devices

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\4c7a86733a4ac849eec1b49179f64b81ed852c47be714d91c3b00d64b79e1399N.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\c.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2280 wrote to memory of 844 N/A C:\Users\Admin\AppData\Local\Temp\4c7a86733a4ac849eec1b49179f64b81ed852c47be714d91c3b00d64b79e1399N.exe C:\Users\Admin\AppData\Local\Temp\c.exe
PID 2280 wrote to memory of 844 N/A C:\Users\Admin\AppData\Local\Temp\4c7a86733a4ac849eec1b49179f64b81ed852c47be714d91c3b00d64b79e1399N.exe C:\Users\Admin\AppData\Local\Temp\c.exe
PID 2280 wrote to memory of 844 N/A C:\Users\Admin\AppData\Local\Temp\4c7a86733a4ac849eec1b49179f64b81ed852c47be714d91c3b00d64b79e1399N.exe C:\Users\Admin\AppData\Local\Temp\c.exe
PID 2280 wrote to memory of 844 N/A C:\Users\Admin\AppData\Local\Temp\4c7a86733a4ac849eec1b49179f64b81ed852c47be714d91c3b00d64b79e1399N.exe C:\Users\Admin\AppData\Local\Temp\c.exe
PID 844 wrote to memory of 2928 N/A C:\Users\Admin\AppData\Local\Temp\c.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 844 wrote to memory of 2928 N/A C:\Users\Admin\AppData\Local\Temp\c.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 844 wrote to memory of 2928 N/A C:\Users\Admin\AppData\Local\Temp\c.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 844 wrote to memory of 2928 N/A C:\Users\Admin\AppData\Local\Temp\c.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 844 wrote to memory of 2928 N/A C:\Users\Admin\AppData\Local\Temp\c.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 844 wrote to memory of 2928 N/A C:\Users\Admin\AppData\Local\Temp\c.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 844 wrote to memory of 2928 N/A C:\Users\Admin\AppData\Local\Temp\c.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 844 wrote to memory of 2928 N/A C:\Users\Admin\AppData\Local\Temp\c.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 844 wrote to memory of 2928 N/A C:\Users\Admin\AppData\Local\Temp\c.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 844 wrote to memory of 2928 N/A C:\Users\Admin\AppData\Local\Temp\c.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 844 wrote to memory of 2928 N/A C:\Users\Admin\AppData\Local\Temp\c.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 844 wrote to memory of 2928 N/A C:\Users\Admin\AppData\Local\Temp\c.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe

Processes

C:\Users\Admin\AppData\Local\Temp\4c7a86733a4ac849eec1b49179f64b81ed852c47be714d91c3b00d64b79e1399N.exe

"C:\Users\Admin\AppData\Local\Temp\4c7a86733a4ac849eec1b49179f64b81ed852c47be714d91c3b00d64b79e1399N.exe"

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

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

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

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

Network

Country Destination Domain Proto
DE 31.220.92.125:8088 31.220.92.125 tcp
US 8.8.8.8:53 win32updatess.DUCKDNS.ORG udp
DE 185.249.198.173:2 win32updatess.DUCKDNS.ORG tcp
DE 185.249.198.173:2 win32updatess.DUCKDNS.ORG tcp
DE 185.249.198.173:2 win32updatess.DUCKDNS.ORG tcp
DE 185.249.198.173:2 win32updatess.DUCKDNS.ORG tcp
DE 185.249.198.173:2 win32updatess.DUCKDNS.ORG tcp
DE 185.249.198.173:2 win32updatess.DUCKDNS.ORG tcp
DE 185.249.198.173:2 win32updatess.DUCKDNS.ORG tcp
DE 185.249.198.173:2 win32updatess.DUCKDNS.ORG tcp
DE 185.249.198.173:2 win32updatess.DUCKDNS.ORG tcp
DE 185.249.198.173:2 win32updatess.DUCKDNS.ORG tcp
DE 185.249.198.173:2 win32updatess.DUCKDNS.ORG tcp
DE 185.249.198.173:2 win32updatess.DUCKDNS.ORG tcp
DE 185.249.198.173:2 win32updatess.DUCKDNS.ORG tcp
DE 185.249.198.173:2 win32updatess.DUCKDNS.ORG tcp
DE 185.249.198.173:2 win32updatess.DUCKDNS.ORG tcp
US 8.8.8.8:53 win32updatess.DUCKDNS.ORG udp
DE 185.249.198.173:2 win32updatess.DUCKDNS.ORG tcp
DE 185.249.198.173:2 win32updatess.DUCKDNS.ORG tcp
DE 185.249.198.173:2 win32updatess.DUCKDNS.ORG tcp
DE 185.249.198.173:2 win32updatess.DUCKDNS.ORG tcp
DE 185.249.198.173:2 win32updatess.DUCKDNS.ORG tcp
DE 185.249.198.173:2 win32updatess.DUCKDNS.ORG tcp
DE 185.249.198.173:2 win32updatess.DUCKDNS.ORG tcp
DE 185.249.198.173:2 win32updatess.DUCKDNS.ORG tcp

Files

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

MD5 85f734c7ff103995e9ffa75bf661ef4f
SHA1 577f8c3cf3c1c78c7f227508d764c6f9c41d4e5c
SHA256 12ec384e29c8c0f15c05583dd84dbe719c454d70cafca9ee3de8dd2fa51f05ee
SHA512 c273bfbd0ffda0625ba8c2b91af6a105cc734ccd544f20f7d43f75328c34585f643bb2c9158d4107ac3404ad3278107200c984a3694359230b55999a9de026ac

memory/844-7-0x00000000745EE000-0x00000000745EF000-memory.dmp

memory/844-8-0x0000000000A00000-0x0000000000D5A000-memory.dmp

memory/844-9-0x00000000003B0000-0x00000000003B6000-memory.dmp

memory/844-10-0x00000000745E0000-0x0000000074CCE000-memory.dmp

memory/844-11-0x00000000062A0000-0x00000000065D4000-memory.dmp

memory/844-12-0x0000000000400000-0x0000000000406000-memory.dmp

memory/844-13-0x00000000745EE000-0x00000000745EF000-memory.dmp

memory/844-14-0x00000000745E0000-0x0000000074CCE000-memory.dmp

memory/844-15-0x0000000007070000-0x0000000007396000-memory.dmp

memory/2928-16-0x0000000000400000-0x0000000000724000-memory.dmp

memory/2928-21-0x0000000000400000-0x0000000000724000-memory.dmp

memory/2928-27-0x0000000000400000-0x0000000000724000-memory.dmp

memory/2928-29-0x0000000000400000-0x0000000000724000-memory.dmp

memory/2928-25-0x0000000000400000-0x0000000000724000-memory.dmp

memory/2928-23-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

memory/844-30-0x00000000745E0000-0x0000000074CCE000-memory.dmp

memory/2928-19-0x0000000000400000-0x0000000000724000-memory.dmp

memory/2928-18-0x0000000000400000-0x0000000000724000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2025-01-08 07:11

Reported

2025-01-08 07:13

Platform

win10v2004-20241007-en

Max time kernel

94s

Max time network

114s

Command Line

"C:\Users\Admin\AppData\Local\Temp\4c7a86733a4ac849eec1b49179f64b81ed852c47be714d91c3b00d64b79e1399N.exe"

Signatures

Quasar RAT

trojan spyware quasar

Quasar family

quasar

Quasar payload

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

Downloads MZ/PE file

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\4c7a86733a4ac849eec1b49179f64b81ed852c47be714d91c3b00d64b79e1399N.exe N/A

Executes dropped EXE

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

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 2300 set thread context of 2904 N/A C:\Users\Admin\AppData\Local\Temp\c.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe

Enumerates physical storage devices

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\4c7a86733a4ac849eec1b49179f64b81ed852c47be714d91c3b00d64b79e1399N.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\c.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe N/A

Suspicious behavior: EnumeratesProcesses

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

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\c.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 3180 wrote to memory of 2300 N/A C:\Users\Admin\AppData\Local\Temp\4c7a86733a4ac849eec1b49179f64b81ed852c47be714d91c3b00d64b79e1399N.exe C:\Users\Admin\AppData\Local\Temp\c.exe
PID 3180 wrote to memory of 2300 N/A C:\Users\Admin\AppData\Local\Temp\4c7a86733a4ac849eec1b49179f64b81ed852c47be714d91c3b00d64b79e1399N.exe C:\Users\Admin\AppData\Local\Temp\c.exe
PID 3180 wrote to memory of 2300 N/A C:\Users\Admin\AppData\Local\Temp\4c7a86733a4ac849eec1b49179f64b81ed852c47be714d91c3b00d64b79e1399N.exe C:\Users\Admin\AppData\Local\Temp\c.exe
PID 2300 wrote to memory of 4636 N/A C:\Users\Admin\AppData\Local\Temp\c.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 2300 wrote to memory of 4636 N/A C:\Users\Admin\AppData\Local\Temp\c.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 2300 wrote to memory of 4636 N/A C:\Users\Admin\AppData\Local\Temp\c.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 2300 wrote to memory of 1204 N/A C:\Users\Admin\AppData\Local\Temp\c.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 2300 wrote to memory of 1204 N/A C:\Users\Admin\AppData\Local\Temp\c.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 2300 wrote to memory of 1204 N/A C:\Users\Admin\AppData\Local\Temp\c.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 2300 wrote to memory of 2904 N/A C:\Users\Admin\AppData\Local\Temp\c.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 2300 wrote to memory of 2904 N/A C:\Users\Admin\AppData\Local\Temp\c.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 2300 wrote to memory of 2904 N/A C:\Users\Admin\AppData\Local\Temp\c.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 2300 wrote to memory of 2904 N/A C:\Users\Admin\AppData\Local\Temp\c.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 2300 wrote to memory of 2904 N/A C:\Users\Admin\AppData\Local\Temp\c.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 2300 wrote to memory of 2904 N/A C:\Users\Admin\AppData\Local\Temp\c.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 2300 wrote to memory of 2904 N/A C:\Users\Admin\AppData\Local\Temp\c.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 2300 wrote to memory of 2904 N/A C:\Users\Admin\AppData\Local\Temp\c.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe

Processes

C:\Users\Admin\AppData\Local\Temp\4c7a86733a4ac849eec1b49179f64b81ed852c47be714d91c3b00d64b79e1399N.exe

"C:\Users\Admin\AppData\Local\Temp\4c7a86733a4ac849eec1b49179f64b81ed852c47be714d91c3b00d64b79e1399N.exe"

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

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

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

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

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

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

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

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

Network

Country Destination Domain Proto
DE 31.220.92.125:8088 31.220.92.125 tcp
US 8.8.8.8:53 125.92.220.31.in-addr.arpa udp
US 8.8.8.8:53 28.118.140.52.in-addr.arpa udp
US 8.8.8.8:53 60.153.16.2.in-addr.arpa udp
US 8.8.8.8:53 0.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 58.55.71.13.in-addr.arpa udp
US 8.8.8.8:53 97.17.167.52.in-addr.arpa udp
US 8.8.8.8:53 win32updatess.DUCKDNS.ORG udp
US 8.8.8.8:53 197.87.175.4.in-addr.arpa udp
US 8.8.8.8:53 241.42.69.40.in-addr.arpa udp
US 8.8.8.8:53 21.49.80.91.in-addr.arpa udp
DE 185.249.198.173:2 win32updatess.DUCKDNS.ORG tcp
US 8.8.8.8:53 ipwho.is udp
DE 195.201.57.90:443 ipwho.is tcp
US 8.8.8.8:53 173.198.249.185.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 90.57.201.195.in-addr.arpa udp
US 8.8.8.8:53 11.227.111.52.in-addr.arpa udp

Files

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

MD5 85f734c7ff103995e9ffa75bf661ef4f
SHA1 577f8c3cf3c1c78c7f227508d764c6f9c41d4e5c
SHA256 12ec384e29c8c0f15c05583dd84dbe719c454d70cafca9ee3de8dd2fa51f05ee
SHA512 c273bfbd0ffda0625ba8c2b91af6a105cc734ccd544f20f7d43f75328c34585f643bb2c9158d4107ac3404ad3278107200c984a3694359230b55999a9de026ac

memory/2300-11-0x0000000074B4E000-0x0000000074B4F000-memory.dmp

memory/2300-12-0x0000000000360000-0x00000000006BA000-memory.dmp

memory/2300-13-0x0000000002BA0000-0x0000000002BA6000-memory.dmp

memory/2300-14-0x0000000074B40000-0x00000000752F0000-memory.dmp

memory/2300-15-0x000000000CBC0000-0x000000000CEF4000-memory.dmp

memory/2300-16-0x000000000D4A0000-0x000000000DA44000-memory.dmp

memory/2300-17-0x0000000006380000-0x0000000006412000-memory.dmp

memory/2300-18-0x00000000029B0000-0x00000000029B6000-memory.dmp

memory/2300-19-0x0000000006770000-0x000000000677A000-memory.dmp

memory/2300-20-0x0000000006810000-0x0000000006886000-memory.dmp

memory/2300-21-0x0000000074B4E000-0x0000000074B4F000-memory.dmp

memory/2300-22-0x0000000074B40000-0x00000000752F0000-memory.dmp

memory/2300-23-0x0000000006990000-0x0000000006CB6000-memory.dmp

memory/2300-24-0x0000000005180000-0x000000000519E000-memory.dmp

memory/2904-25-0x0000000000400000-0x0000000000724000-memory.dmp

memory/2300-27-0x0000000074B40000-0x00000000752F0000-memory.dmp

memory/2904-28-0x0000000074B40000-0x00000000752F0000-memory.dmp

memory/2904-29-0x0000000074B40000-0x00000000752F0000-memory.dmp

memory/2904-30-0x00000000067C0000-0x0000000006DD8000-memory.dmp

memory/2904-31-0x0000000006220000-0x0000000006270000-memory.dmp

memory/2904-32-0x0000000006490000-0x0000000006542000-memory.dmp

memory/2904-35-0x0000000007960000-0x0000000007972000-memory.dmp

memory/2904-36-0x00000000079C0000-0x00000000079FC000-memory.dmp

memory/2904-37-0x0000000007A70000-0x0000000007AD6000-memory.dmp

memory/2904-38-0x0000000074B40000-0x00000000752F0000-memory.dmp

memory/2904-39-0x0000000074B40000-0x00000000752F0000-memory.dmp