Analysis Overview
SHA256
d00477c11f3c8ad73a0ea9c3c4b7e549754ed63b645a3a8f57de6dd2f89ec8d0
Threat Level: Known bad
The file Client-built.exe was found to be: Known bad.
Malicious Activity Summary
Quasar RAT
Quasar family
Quasar payload
Command and Scripting Interpreter: PowerShell
Executes dropped EXE
Checks computer location settings
Drops file in System32 directory
System Location Discovery: System Language Discovery
Unsigned PE
System Network Configuration Discovery: Internet Connection Discovery
Enumerates physical storage devices
Modifies Internet Explorer settings
Suspicious use of WriteProcessMemory
Modifies registry class
Uses Task Scheduler COM API
Suspicious use of AdjustPrivilegeToken
Suspicious use of FindShellTrayWindow
Suspicious use of SetWindowsHookEx
Suspicious use of SendNotifyMessage
Scheduled Task/Job: Scheduled Task
Runs ping.exe
Suspicious behavior: EnumeratesProcesses
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-08-18 21:25
Signatures
Quasar family
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
2024-08-18 21:25
Reported
2024-08-18 21:27
Platform
win7-20240705-en
Max time kernel
128s
Max time network
153s
Command Line
Signatures
Quasar RAT
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:\Windows\system32\Windows\Windows Host Process.exe | N/A |
Drops file in System32 directory
| Description | Indicator | Process | Target |
| File opened for modification | C:\Windows\system32\Windows\Windows Host Process.exe | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
| File opened for modification | C:\Windows\system32\Windows | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
| File opened for modification | C:\Windows\system32\Windows\Windows Host Process.exe | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| File opened for modification | C:\Windows\system32\Windows | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| File created | C:\Windows\system32\Windows\Windows Host Process.exe | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
Scheduled Task/Job: Scheduled Task
| 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\Client-built.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
Suspicious use of FindShellTrayWindow
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
Suspicious use of SendNotifyMessage
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
Suspicious use of WriteProcessMemory
Uses Task Scheduler COM API
Processes
C:\Users\Admin\AppData\Local\Temp\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Windows Host Process" /sc ONLOGON /tr "C:\Windows\system32\Windows\Windows Host Process.exe" /rl HIGHEST /f
C:\Windows\system32\Windows\Windows Host Process.exe
"C:\Windows\system32\Windows\Windows Host Process.exe"
C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Windows Host Process" /sc ONLOGON /tr "C:\Windows\system32\Windows\Windows Host Process.exe" /rl HIGHEST /f
Network
| Country | Destination | Domain | Proto |
| US | 147.185.221.22:6712 | tcp | |
| US | 147.185.221.22:6712 | tcp | |
| US | 147.185.221.22:6712 | tcp | |
| US | 147.185.221.22:6712 | tcp |
Files
memory/2104-0-0x000007FEF6243000-0x000007FEF6244000-memory.dmp
memory/2104-1-0x0000000000A00000-0x0000000000D58000-memory.dmp
memory/2104-2-0x000007FEF6240000-0x000007FEF6C2C000-memory.dmp
C:\Windows\system32\Windows\Windows Host Process.exe
| MD5 | 9eb8732b560208f0380c386771aba096 |
| SHA1 | d2ae1ff6755e79f97485aea27912ed7710378b08 |
| SHA256 | d00477c11f3c8ad73a0ea9c3c4b7e549754ed63b645a3a8f57de6dd2f89ec8d0 |
| SHA512 | 686b1968a19d6f81562df6efd659060ecc7d2eceb7b053d530e8bcba030db6e7b55cb7c6364d6dddc7ea9a46b5004cae3a78db5b432ed279ce2fa854fa400b8a |
memory/2680-10-0x000007FEF6240000-0x000007FEF6C2C000-memory.dmp
memory/2680-9-0x0000000000B60000-0x0000000000EB8000-memory.dmp
memory/2680-11-0x000007FEF6240000-0x000007FEF6C2C000-memory.dmp
memory/2104-8-0x000007FEF6240000-0x000007FEF6C2C000-memory.dmp
memory/2680-12-0x000007FEF6240000-0x000007FEF6C2C000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2024-08-18 21:25
Reported
2024-08-18 21:35
Platform
win10v2004-20240802-en
Max time kernel
435s
Max time network
436s
Command Line
Signatures
Quasar RAT
Quasar payload
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
| N/A | N/A | N/A | N/A |
Command and Scripting Interpreter: PowerShell
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe | N/A |
Checks computer location settings
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\USER\S-1-5-21-2392887640-1187051047-2909758433-1000\Control Panel\International\Geo\Nation | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
Executes dropped EXE
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
Drops file in System32 directory
| Description | Indicator | Process | Target |
| File created | C:\Windows\system32\Windows\Windows Host Process.exe | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
| File opened for modification | C:\Windows\system32\Windows\Windows Host Process.exe | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
| File opened for modification | C:\Windows\system32\Windows | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
| File opened for modification | C:\Windows\system32\Windows\Windows Host Process.exe | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| File opened for modification | C:\Windows\system32\Windows | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
Enumerates physical storage devices
System Location Discovery: System Language Discovery
| Description | Indicator | Process | Target |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language | C:\Windows\SysWOW64\DllHost.exe | N/A |
System Network Configuration Discovery: Internet Connection Discovery
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\PING.EXE | N/A |
Modifies Internet Explorer settings
| Description | Indicator | Process | Target |
| Key created | \REGISTRY\USER\S-1-5-21-2392887640-1187051047-2909758433-1000\Software\Microsoft\Internet Explorer\Toolbar | C:\Windows\explorer.exe | N/A |
| Set value (int) | \REGISTRY\USER\S-1-5-21-2392887640-1187051047-2909758433-1000\SOFTWARE\Microsoft\Internet Explorer\Toolbar\Locked = "1" | C:\Windows\explorer.exe | N/A |
Modifies registry class
| Description | Indicator | Process | Target |
| Key created | \REGISTRY\USER\S-1-5-21-2392887640-1187051047-2909758433-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell | C:\Windows\explorer.exe | N/A |
| Key created | \REGISTRY\USER\S-1-5-21-2392887640-1187051047-2909758433-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU | C:\Windows\explorer.exe | N/A |
| Set value (data) | \REGISTRY\USER\S-1-5-21-2392887640-1187051047-2909758433-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\NodeSlots | C:\Windows\explorer.exe | N/A |
| Set value (data) | \REGISTRY\USER\S-1-5-21-2392887640-1187051047-2909758433-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\MRUListEx = ffffffff | C:\Windows\explorer.exe | N/A |
| Key created | \REGISTRY\USER\S-1-5-21-2392887640-1187051047-2909758433-1000_Classes\Local Settings | C:\Windows\explorer.exe | N/A |
Runs ping.exe
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\PING.EXE | N/A |
Scheduled Task/Job: Scheduled Task
| 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 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:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe | N/A |
Suspicious use of FindShellTrayWindow
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
Suspicious use of SendNotifyMessage
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
Suspicious use of WriteProcessMemory
Uses Task Scheduler COM API
Processes
C:\Users\Admin\AppData\Local\Temp\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Windows Host Process" /sc ONLOGON /tr "C:\Windows\system32\Windows\Windows Host Process.exe" /rl HIGHEST /f
C:\Windows\system32\Windows\Windows Host Process.exe
"C:\Windows\system32\Windows\Windows Host Process.exe"
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Windows Host Process" /sc ONLOGON /tr "C:\Windows\system32\Windows\Windows Host Process.exe" /rl HIGHEST /f
C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"powershell.exe" -Command "Add-MpPreference -ExclusionPath 'C:\'"
C:\Windows\SysWOW64\DllHost.exe
C:\Windows\SysWOW64\DllHost.exe /Processid:{06622D85-6856-4460-8DE1-A81921B41C4B}
C:\Windows\explorer.exe
C:\Windows\explorer.exe /factory,{5BD95610-9434-43C2-886C-57852CC8A120} -Embedding
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /delete /tn "Windows Host Process" /f
C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\uCTdtSDvidJt.bat" "
C:\Windows\system32\chcp.com
chcp 65001
C:\Windows\system32\PING.EXE
ping -n 10 localhost
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | 241.150.49.20.in-addr.arpa | udp |
| US | 147.185.221.22:6712 | tcp | |
| US | 8.8.8.8:53 | 73.31.126.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 95.221.229.192.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 22.221.185.147.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 43.58.199.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 209.205.72.20.in-addr.arpa | udp |
| US | 147.185.221.22:6712 | 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 | 240.143.123.92.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 90.57.201.195.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 26.165.165.52.in-addr.arpa | udp |
| US | 147.185.221.22:6712 | tcp | |
| US | 8.8.8.8:53 | 15.164.165.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 98.58.20.217.in-addr.arpa | udp |
| US | 8.8.8.8:53 | tse1.mm.bing.net | udp |
| US | 150.171.28.10:443 | tse1.mm.bing.net | tcp |
| US | 150.171.28.10:443 | tse1.mm.bing.net | tcp |
| US | 150.171.28.10:443 | tse1.mm.bing.net | tcp |
| US | 150.171.28.10:443 | tse1.mm.bing.net | tcp |
| US | 150.171.28.10:443 | tse1.mm.bing.net | tcp |
| US | 8.8.8.8:53 | 26.35.223.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 10.28.171.150.in-addr.arpa | udp |
| US | 147.185.221.22:6712 | tcp | |
| US | 8.8.8.8:53 | 92.16.208.104.in-addr.arpa | udp |
| US | 147.185.221.22:6712 | tcp | |
| US | 147.185.221.22:6712 | tcp | |
| US | 147.185.221.22:6712 | tcp |
Files
memory/5080-0-0x00007FFD1F223000-0x00007FFD1F225000-memory.dmp
memory/5080-1-0x0000000000790000-0x0000000000AE8000-memory.dmp
memory/5080-2-0x00007FFD1F220000-0x00007FFD1FCE1000-memory.dmp
C:\Windows\System32\Windows\Windows Host Process.exe
| MD5 | 9eb8732b560208f0380c386771aba096 |
| SHA1 | d2ae1ff6755e79f97485aea27912ed7710378b08 |
| SHA256 | d00477c11f3c8ad73a0ea9c3c4b7e549754ed63b645a3a8f57de6dd2f89ec8d0 |
| SHA512 | 686b1968a19d6f81562df6efd659060ecc7d2eceb7b053d530e8bcba030db6e7b55cb7c6364d6dddc7ea9a46b5004cae3a78db5b432ed279ce2fa854fa400b8a |
memory/5080-9-0x00007FFD1F220000-0x00007FFD1FCE1000-memory.dmp
memory/3896-10-0x00007FFD1F220000-0x00007FFD1FCE1000-memory.dmp
memory/3896-11-0x00007FFD1F220000-0x00007FFD1FCE1000-memory.dmp
memory/3896-12-0x000000001B8F0000-0x000000001B940000-memory.dmp
memory/3896-13-0x000000001C100000-0x000000001C1B2000-memory.dmp
memory/3896-14-0x00007FFD1F220000-0x00007FFD1FCE1000-memory.dmp
memory/3896-17-0x000000001C090000-0x000000001C0A2000-memory.dmp
memory/3896-18-0x000000001CE00000-0x000000001CE3C000-memory.dmp
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_v5rvylxm.2rd.ps1
| MD5 | d17fe0a3f47be24a6453e9ef58c94641 |
| SHA1 | 6ab83620379fc69f80c0242105ddffd7d98d5d9d |
| SHA256 | 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7 |
| SHA512 | 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82 |
memory/1912-24-0x0000028E346F0000-0x0000028E34712000-memory.dmp
memory/3896-31-0x000000001D670000-0x000000001DB98000-memory.dmp
C:\Users\Admin\AppData\Local\Temp\uCTdtSDvidJt.bat
| MD5 | 965c829039f3d549a5905a168ee34311 |
| SHA1 | dc572eeb4e27bb6892ed39ae05506bf76c9c2a38 |
| SHA256 | b17acacbd92259fbab080f8d284f6b971493561f8b7243972309289949a9d522 |
| SHA512 | 6045c9a65cdaa78222dc3eab4320522fe868077d635c8aecf8effcdadd2219747cdfad67175ecc061e88b94465664b1401091a5fa65cba7f3006f27b39b37fae |
memory/3896-41-0x00007FFD1F220000-0x00007FFD1FCE1000-memory.dmp