Analysis Overview
SHA256
f4dc1a032d33002bd859c3cad82dc31ffed0ce62c29fb899860a37b1d7dcfcbc
Threat Level: Known bad
The file virussign.com_9599e82a8fa3a606c186e75e4d7d7100.vir was found to be: Known bad.
Malicious Activity Summary
Quasar RAT
Checks computer location settings
Executes dropped EXE
Adds Run key to start application
Looks up external IP address via web service
Enumerates physical storage devices
Unsigned PE
Suspicious use of AdjustPrivilegeToken
Uses Task Scheduler COM API
Creates scheduled task(s)
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-05-28 15:41
Signatures
Unsigned PE
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Analysis: behavioral1
Detonation Overview
Submitted
2024-05-28 15:41
Reported
2024-05-28 15:44
Platform
win7-20240221-en
Max time kernel
150s
Max time network
149s
Command Line
Signatures
Quasar RAT
Executes dropped EXE
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
Adds Run key to start application
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\USER\S-1-5-21-330940541-141609230-1670313778-1000\Software\Microsoft\Windows\CurrentVersion\Run\Quasar Client Startup = "\"C:\\Users\\Admin\\AppData\\Roaming\\SubDir\\Client.exe\"" | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
Looks up external IP address via web service
| Description | Indicator | Process | Target |
| N/A | ip-api.com | N/A | N/A |
Enumerates physical storage devices
Creates scheduled task(s)
| 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 |
| 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\virussign.com_9599e82a8fa3a606c186e75e4d7d7100.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
Suspicious use of WriteProcessMemory
Uses Task Scheduler COM API
Processes
C:\Users\Admin\AppData\Local\Temp\virussign.com_9599e82a8fa3a606c186e75e4d7d7100.exe
"C:\Users\Admin\AppData\Local\Temp\virussign.com_9599e82a8fa3a606c186e75e4d7d7100.exe"
C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\virussign.com_9599e82a8fa3a606c186e75e4d7d7100.exe" /rl HIGHEST /f
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
C:\Windows\System32\schtasks.exe
"C:\Windows\System32\schtasks.exe" /create /tn "WINDOWSSYSTEMHOST" /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /sc MINUTE /MO 1
C:\Windows\system32\taskeng.exe
taskeng.exe {8742B83A-71C8-48D2-8CB7-9D735C84FDD7} S-1-5-21-330940541-141609230-1670313778-1000:KXIPPCKF\Admin:Interactive:[1]
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | ip-api.com | udp |
| US | 208.95.112.1:80 | ip-api.com | tcp |
| US | 208.95.112.1:80 | ip-api.com | tcp |
| N/A | 10.1.10.103:82 | tcp | |
| N/A | 10.1.10.103:82 | tcp | |
| N/A | 10.1.10.103:82 | tcp | |
| N/A | 10.1.10.103:82 | tcp | |
| N/A | 10.1.10.103:82 | tcp | |
| N/A | 10.1.10.103:82 | tcp |
Files
memory/2756-0-0x000007FEF5753000-0x000007FEF5754000-memory.dmp
memory/2756-1-0x00000000013C0000-0x00000000013C8000-memory.dmp
memory/2756-2-0x0000000000DC0000-0x0000000000E5E000-memory.dmp
memory/2756-3-0x000007FEF5750000-0x000007FEF613C000-memory.dmp
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
| MD5 | 9599e82a8fa3a606c186e75e4d7d7100 |
| SHA1 | ea31dacbcba204026017a13e43f867c4cf0c4690 |
| SHA256 | f4dc1a032d33002bd859c3cad82dc31ffed0ce62c29fb899860a37b1d7dcfcbc |
| SHA512 | 126354727846d252d856ededee7aabb66442c0f29cb945735391f9a26657f1d682cdd0745672b5801cae039f8e13d573849b51ed2998b801976330df81d0194d |
memory/2500-9-0x0000000000AD0000-0x0000000000AD8000-memory.dmp
memory/2500-10-0x000007FEF5750000-0x000007FEF613C000-memory.dmp
memory/2500-11-0x000007FEF5750000-0x000007FEF613C000-memory.dmp
memory/2756-12-0x000007FEF5750000-0x000007FEF613C000-memory.dmp
memory/2500-14-0x000007FEF5750000-0x000007FEF613C000-memory.dmp
memory/2500-16-0x000007FEF5750000-0x000007FEF613C000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2024-05-28 15:41
Reported
2024-05-28 15:43
Platform
win10v2004-20240426-en
Max time kernel
148s
Max time network
144s
Command Line
Signatures
Quasar RAT
Checks computer location settings
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\USER\S-1-5-21-3906287020-2915474608-1755617787-1000\Control Panel\International\Geo\Nation | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
Executes dropped EXE
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
Adds Run key to start application
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\USER\S-1-5-21-3906287020-2915474608-1755617787-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Quasar Client Startup = "\"C:\\Users\\Admin\\AppData\\Roaming\\SubDir\\Client.exe\"" | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
Looks up external IP address via web service
| Description | Indicator | Process | Target |
| N/A | ip-api.com | N/A | N/A |
Enumerates physical storage devices
Creates scheduled task(s)
| 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 |
| 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\virussign.com_9599e82a8fa3a606c186e75e4d7d7100.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
Suspicious use of WriteProcessMemory
Uses Task Scheduler COM API
Processes
C:\Users\Admin\AppData\Local\Temp\virussign.com_9599e82a8fa3a606c186e75e4d7d7100.exe
"C:\Users\Admin\AppData\Local\Temp\virussign.com_9599e82a8fa3a606c186e75e4d7d7100.exe"
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\virussign.com_9599e82a8fa3a606c186e75e4d7d7100.exe" /rl HIGHEST /f
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
C:\Windows\System32\schtasks.exe
"C:\Windows\System32\schtasks.exe" /create /tn "WINDOWSSYSTEMHOST" /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /sc MINUTE /MO 1
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | 8.8.8.8.in-addr.arpa | udp |
| US | 8.8.8.8:53 | ip-api.com | udp |
| US | 208.95.112.1:80 | ip-api.com | tcp |
| US | 8.8.8.8:53 | tse1.mm.bing.net | udp |
| US | 204.79.197.200:443 | tse1.mm.bing.net | tcp |
| US | 204.79.197.200:443 | tse1.mm.bing.net | tcp |
| US | 204.79.197.200:443 | tse1.mm.bing.net | tcp |
| US | 8.8.8.8:53 | 209.205.72.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 18.24.18.2.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 1.112.95.208.in-addr.arpa | udp |
| US | 208.95.112.1:80 | ip-api.com | tcp |
| US | 8.8.8.8:53 | 22.177.190.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 95.221.229.192.in-addr.arpa | udp |
| N/A | 10.1.10.103:82 | tcp | |
| US | 8.8.8.8:53 | 133.211.185.52.in-addr.arpa | udp |
| N/A | 10.1.10.103:82 | tcp | |
| US | 8.8.8.8:53 | 86.23.85.13.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 18.31.95.13.in-addr.arpa | udp |
| N/A | 10.1.10.103:82 | tcp | |
| US | 8.8.8.8:53 | 82.90.14.23.in-addr.arpa | udp |
| N/A | 10.1.10.103:82 | tcp | |
| US | 8.8.8.8:53 | 91.90.14.23.in-addr.arpa | udp |
| N/A | 10.1.10.103:82 | tcp | |
| N/A | 10.1.10.103:82 | tcp |
Files
memory/4740-0-0x0000000000CF0000-0x0000000000CF8000-memory.dmp
memory/4740-1-0x00007FF8CC1D3000-0x00007FF8CC1D5000-memory.dmp
memory/4740-2-0x0000000002DC0000-0x0000000002E5E000-memory.dmp
memory/4740-3-0x00007FF8CC1D0000-0x00007FF8CCC91000-memory.dmp
memory/4740-4-0x000000001C2F0000-0x000000001C302000-memory.dmp
memory/4740-5-0x000000001C7D0000-0x000000001C80C000-memory.dmp
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
| MD5 | 9599e82a8fa3a606c186e75e4d7d7100 |
| SHA1 | ea31dacbcba204026017a13e43f867c4cf0c4690 |
| SHA256 | f4dc1a032d33002bd859c3cad82dc31ffed0ce62c29fb899860a37b1d7dcfcbc |
| SHA512 | 126354727846d252d856ededee7aabb66442c0f29cb945735391f9a26657f1d682cdd0745672b5801cae039f8e13d573849b51ed2998b801976330df81d0194d |
memory/1400-12-0x00007FF8CC1D0000-0x00007FF8CCC91000-memory.dmp
memory/1400-14-0x00007FF8CC1D0000-0x00007FF8CCC91000-memory.dmp
memory/4740-13-0x00007FF8CC1D0000-0x00007FF8CCC91000-memory.dmp
memory/1400-16-0x00007FF8CC1D0000-0x00007FF8CCC91000-memory.dmp
memory/1400-17-0x00007FF8CC1D0000-0x00007FF8CCC91000-memory.dmp
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Client.exe.log
| MD5 | 2362dcc9d262d0969898b143fb7fc91a |
| SHA1 | 2240860a675c86425f5702b501eac121bfb744eb |
| SHA256 | 4f7cff601d97caf1e0040bc2d63ccadd27294b2e551ff4167e0b080c69a915b0 |
| SHA512 | 59cb7e53dc9cc02f25216cc87115403ed67fb5d24947ef2e803cd54e9f118d5d65a71817b05642c238ca48eb7bfd228d008d92e42023f2c15755c64c88f5b0d6 |