Analysis Overview
SHA256
604d490b9d5dfff01c9fceb085798c6b42f5778c9f125457be654dc4f436ab04
Threat Level: Known bad
The file RvcDownloader.exe was found to be: Known bad.
Malicious Activity Summary
njRAT/Bladabindi
Drops startup file
Executes dropped EXE
Checks computer location settings
Legitimate hosting services abused for malware hosting/C2
Adds Run key to start application
Suspicious use of NtSetInformationThreadHideFromDebugger
Enumerates physical storage devices
Unsigned PE
Suspicious behavior: GetForegroundWindowSpam
Suspicious use of AdjustPrivilegeToken
Creates scheduled task(s)
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-02-03 16:15
Signatures
Unsigned PE
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Analysis: behavioral1
Detonation Overview
Submitted
2024-02-03 16:15
Reported
2024-02-03 16:18
Platform
win10-20231215-en
Max time kernel
150s
Max time network
155s
Command Line
Signatures
njRAT/Bladabindi
Drops startup file
| Description | Indicator | Process | Target |
| File created | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Java update.exe | C:\Users\Admin\AppData\Local\Temp\Dllhost.exe | N/A |
| File opened for modification | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Java update.exe | C:\Users\Admin\AppData\Local\Temp\Dllhost.exe | N/A |
Executes dropped EXE
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\Dllhost.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\Server.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\Server.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\Server.exe | N/A |
Adds Run key to start application
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Windows Update = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\Dllhost.exe\" .." | C:\Users\Admin\AppData\Local\Temp\Dllhost.exe | N/A |
| Set value (str) | \REGISTRY\USER\S-1-5-21-721438792-2341338383-2410509276-1000\Software\Microsoft\Windows\CurrentVersion\Run\Windows Update = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\Dllhost.exe\" .." | C:\Users\Admin\AppData\Local\Temp\Dllhost.exe | N/A |
Legitimate hosting services abused for malware hosting/C2
| Description | Indicator | Process | Target |
| N/A | 2.tcp.eu.ngrok.io | N/A | N/A |
Suspicious use of NtSetInformationThreadHideFromDebugger
Enumerates physical storage devices
Creates scheduled task(s)
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\schtasks.exe | N/A |
Suspicious behavior: GetForegroundWindowSpam
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\RvcDownloader.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\Dllhost.exe | N/A |
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\RvcDownloader.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\Dllhost.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\Server.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\Server.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\Server.exe | N/A |
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 2124 wrote to memory of 4052 | N/A | C:\Users\Admin\AppData\Local\Temp\RvcDownloader.exe | C:\Users\Admin\AppData\Local\Temp\Dllhost.exe |
| PID 2124 wrote to memory of 4052 | N/A | C:\Users\Admin\AppData\Local\Temp\RvcDownloader.exe | C:\Users\Admin\AppData\Local\Temp\Dllhost.exe |
| PID 2124 wrote to memory of 4052 | N/A | C:\Users\Admin\AppData\Local\Temp\RvcDownloader.exe | C:\Users\Admin\AppData\Local\Temp\Dllhost.exe |
| PID 4052 wrote to memory of 3960 | N/A | C:\Users\Admin\AppData\Local\Temp\Dllhost.exe | C:\Windows\SysWOW64\schtasks.exe |
| PID 4052 wrote to memory of 3960 | N/A | C:\Users\Admin\AppData\Local\Temp\Dllhost.exe | C:\Windows\SysWOW64\schtasks.exe |
| PID 4052 wrote to memory of 3960 | N/A | C:\Users\Admin\AppData\Local\Temp\Dllhost.exe | C:\Windows\SysWOW64\schtasks.exe |
Processes
C:\Users\Admin\AppData\Local\Temp\RvcDownloader.exe
"C:\Users\Admin\AppData\Local\Temp\RvcDownloader.exe"
C:\Users\Admin\AppData\Local\Temp\Dllhost.exe
"C:\Users\Admin\AppData\Local\Temp\Dllhost.exe"
C:\Windows\SysWOW64\schtasks.exe
schtasks /create /sc minute /mo 1 /tn Server /tr C:\Users\Admin\AppData\Local\Temp/Server.exe
C:\Users\Admin\AppData\Local\Temp\Server.exe
C:\Users\Admin\AppData\Local\Temp/Server.exe
C:\Users\Admin\AppData\Local\Temp\Server.exe
C:\Users\Admin\AppData\Local\Temp/Server.exe
C:\Users\Admin\AppData\Local\Temp\Server.exe
C:\Users\Admin\AppData\Local\Temp/Server.exe
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | 178.223.142.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 2.tcp.eu.ngrok.io | udp |
| DE | 18.156.13.209:13538 | 2.tcp.eu.ngrok.io | tcp |
| US | 8.8.8.8:53 | 209.13.156.18.in-addr.arpa | udp |
| DE | 18.156.13.209:13538 | 2.tcp.eu.ngrok.io | tcp |
| US | 8.8.8.8:53 | 30.243.111.52.in-addr.arpa | udp |
Files
memory/2124-0-0x0000000000040000-0x00000000003B4000-memory.dmp
memory/2124-1-0x0000000000040000-0x00000000003B4000-memory.dmp
memory/2124-2-0x0000000073250000-0x000000007393E000-memory.dmp
memory/2124-3-0x00000000054E0000-0x000000000557C000-memory.dmp
memory/2124-4-0x0000000003490000-0x00000000034A0000-memory.dmp
memory/2124-5-0x0000000005C80000-0x000000000617E000-memory.dmp
memory/2124-6-0x0000000005820000-0x00000000058B2000-memory.dmp
C:\Users\Admin\AppData\Local\Temp\Dllhost.exe
| MD5 | 7f6ce9a396cae9d375cb1a56de268b84 |
| SHA1 | 4129cc4492f057cc2ec78c195c1badd7ab3d9c65 |
| SHA256 | 604d490b9d5dfff01c9fceb085798c6b42f5778c9f125457be654dc4f436ab04 |
| SHA512 | e3cfe5afbde8b7889767cd9556ddbff2a3652ab139f06f02ec27cbd638d05604b3cbd5dcc2732a62750ced77d32eeab69b92e7eca38fe434121611c8775c314d |
memory/4052-13-0x0000000000270000-0x00000000005E4000-memory.dmp
memory/2124-15-0x0000000000040000-0x00000000003B4000-memory.dmp
memory/4052-18-0x0000000073250000-0x000000007393E000-memory.dmp
memory/2124-17-0x0000000073250000-0x000000007393E000-memory.dmp
memory/4052-19-0x0000000000270000-0x00000000005E4000-memory.dmp
memory/4052-16-0x0000000000270000-0x00000000005E4000-memory.dmp
memory/4052-20-0x00000000055C0000-0x00000000055D0000-memory.dmp
memory/4052-24-0x0000000005710000-0x000000000571A000-memory.dmp
memory/4052-25-0x0000000005880000-0x00000000058E6000-memory.dmp
memory/4052-26-0x00000000066D0000-0x00000000066E8000-memory.dmp
memory/4052-28-0x0000000000270000-0x00000000005E4000-memory.dmp
memory/4052-31-0x0000000073250000-0x000000007393E000-memory.dmp
memory/3776-32-0x0000000000930000-0x0000000000CA4000-memory.dmp
memory/3776-34-0x0000000073250000-0x000000007393E000-memory.dmp
memory/4052-33-0x00000000055C0000-0x00000000055D0000-memory.dmp
memory/3776-35-0x0000000000930000-0x0000000000CA4000-memory.dmp
memory/3776-38-0x0000000000930000-0x0000000000CA4000-memory.dmp
memory/3776-39-0x0000000073250000-0x000000007393E000-memory.dmp
memory/4052-40-0x0000000006810000-0x000000000681A000-memory.dmp
memory/4616-47-0x0000000000930000-0x0000000000CA4000-memory.dmp
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\Server.exe.log
| MD5 | 0de4a673c46d192f575c41e7c80ffc3e |
| SHA1 | 7a1da7e8ec2efd904ecb237ebedd4d7a3ee826f1 |
| SHA256 | c18d0ff8e7b83a8623a8515d91d65f68deef6da9f68d84886864177f45acbf65 |
| SHA512 | b505619848b2f6038e68a2d7baaa4cf314d39023a5b7a32001262ecda03a905986ac8a45a249745e29637b0acfaba1ae06bfaecc678283a808e6f9f4b455e209 |
memory/4616-50-0x0000000073250000-0x000000007393E000-memory.dmp
memory/4616-51-0x0000000000930000-0x0000000000CA4000-memory.dmp
memory/4616-52-0x0000000000930000-0x0000000000CA4000-memory.dmp
memory/4616-53-0x0000000003080000-0x0000000003090000-memory.dmp
memory/4616-55-0x0000000000930000-0x0000000000CA4000-memory.dmp
memory/4616-56-0x0000000073250000-0x000000007393E000-memory.dmp
memory/2892-64-0x0000000000930000-0x0000000000CA4000-memory.dmp
memory/2892-65-0x0000000073250000-0x000000007393E000-memory.dmp
memory/2892-66-0x0000000000930000-0x0000000000CA4000-memory.dmp
memory/2892-67-0x0000000000930000-0x0000000000CA4000-memory.dmp
memory/2892-68-0x0000000005270000-0x0000000005280000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2024-02-03 16:15
Reported
2024-02-03 16:18
Platform
win10v2004-20231215-en
Max time kernel
157s
Max time network
164s
Command Line
Signatures
njRAT/Bladabindi
Checks computer location settings
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\USER\S-1-5-21-3073191680-435865314-2862784915-1000\Control Panel\International\Geo\Nation | C:\Users\Admin\AppData\Local\Temp\RvcDownloader.exe | N/A |
Drops startup file
| Description | Indicator | Process | Target |
| File created | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Java update.exe | C:\Users\Admin\AppData\Local\Temp\Dllhost.exe | N/A |
| File opened for modification | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Java update.exe | C:\Users\Admin\AppData\Local\Temp\Dllhost.exe | N/A |
Executes dropped EXE
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\Dllhost.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\Server.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\Server.exe | N/A |
Adds Run key to start application
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Windows Update = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\Dllhost.exe\" .." | C:\Users\Admin\AppData\Local\Temp\Dllhost.exe | N/A |
| Set value (str) | \REGISTRY\USER\S-1-5-21-3073191680-435865314-2862784915-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Windows Update = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\Dllhost.exe\" .." | C:\Users\Admin\AppData\Local\Temp\Dllhost.exe | N/A |
Legitimate hosting services abused for malware hosting/C2
| Description | Indicator | Process | Target |
| N/A | 2.tcp.eu.ngrok.io | N/A | N/A |
Suspicious use of NtSetInformationThreadHideFromDebugger
Enumerates physical storage devices
Creates scheduled task(s)
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\schtasks.exe | N/A |
Suspicious behavior: GetForegroundWindowSpam
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\RvcDownloader.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\Dllhost.exe | N/A |
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\RvcDownloader.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\Dllhost.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\Server.exe | N/A |
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 2568 wrote to memory of 2544 | N/A | C:\Users\Admin\AppData\Local\Temp\RvcDownloader.exe | C:\Users\Admin\AppData\Local\Temp\Dllhost.exe |
| PID 2568 wrote to memory of 2544 | N/A | C:\Users\Admin\AppData\Local\Temp\RvcDownloader.exe | C:\Users\Admin\AppData\Local\Temp\Dllhost.exe |
| PID 2568 wrote to memory of 2544 | N/A | C:\Users\Admin\AppData\Local\Temp\RvcDownloader.exe | C:\Users\Admin\AppData\Local\Temp\Dllhost.exe |
| PID 2544 wrote to memory of 1916 | N/A | C:\Users\Admin\AppData\Local\Temp\Dllhost.exe | C:\Windows\SysWOW64\schtasks.exe |
| PID 2544 wrote to memory of 1916 | N/A | C:\Users\Admin\AppData\Local\Temp\Dllhost.exe | C:\Windows\SysWOW64\schtasks.exe |
| PID 2544 wrote to memory of 1916 | N/A | C:\Users\Admin\AppData\Local\Temp\Dllhost.exe | C:\Windows\SysWOW64\schtasks.exe |
Processes
C:\Users\Admin\AppData\Local\Temp\RvcDownloader.exe
"C:\Users\Admin\AppData\Local\Temp\RvcDownloader.exe"
C:\Users\Admin\AppData\Local\Temp\Dllhost.exe
"C:\Users\Admin\AppData\Local\Temp\Dllhost.exe"
C:\Windows\SysWOW64\schtasks.exe
schtasks /create /sc minute /mo 1 /tn Server /tr C:\Users\Admin\AppData\Local\Temp/Server.exe
C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k LocalSystemNetworkRestricted -p -s DisplayEnhancementService
C:\Users\Admin\AppData\Local\Temp\Server.exe
C:\Users\Admin\AppData\Local\Temp/Server.exe
C:\Users\Admin\AppData\Local\Temp\Server.exe
C:\Users\Admin\AppData\Local\Temp/Server.exe
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | 149.220.183.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 74.32.126.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 95.221.229.192.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 183.142.211.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 183.59.114.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 206.23.85.13.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 217.135.221.88.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 2.tcp.eu.ngrok.io | udp |
| DE | 3.127.138.57:13538 | 2.tcp.eu.ngrok.io | tcp |
| US | 8.8.8.8:53 | 57.138.127.3.in-addr.arpa | udp |
| DE | 3.127.138.57:13538 | 2.tcp.eu.ngrok.io | tcp |
| US | 8.8.8.8:53 | 75.159.190.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 201.178.17.96.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 14.227.111.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | cxcs.microsoft.net | udp |
| GB | 92.123.128.164:443 | www.bing.com | tcp |
| GB | 23.214.133.66:443 | cxcs.microsoft.net | tcp |
| US | 8.8.8.8:53 | 66.133.214.23.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 164.128.123.92.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 176.178.17.96.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 172.178.17.96.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 6.173.189.20.in-addr.arpa | udp |
Files
memory/2568-0-0x0000000000A40000-0x0000000000DB4000-memory.dmp
memory/2568-1-0x0000000073DA0000-0x0000000074550000-memory.dmp
memory/2568-2-0x0000000000A40000-0x0000000000DB4000-memory.dmp
memory/2568-3-0x0000000006000000-0x000000000609C000-memory.dmp
memory/2568-5-0x0000000003C50000-0x0000000003C60000-memory.dmp
memory/2568-6-0x0000000003C50000-0x0000000003C60000-memory.dmp
memory/2568-7-0x00000000068A0000-0x0000000006E44000-memory.dmp
memory/2568-8-0x00000000063F0000-0x0000000006482000-memory.dmp
C:\Users\Admin\AppData\Local\Temp\Dllhost.exe
| MD5 | 7f6ce9a396cae9d375cb1a56de268b84 |
| SHA1 | 4129cc4492f057cc2ec78c195c1badd7ab3d9c65 |
| SHA256 | 604d490b9d5dfff01c9fceb085798c6b42f5778c9f125457be654dc4f436ab04 |
| SHA512 | e3cfe5afbde8b7889767cd9556ddbff2a3652ab139f06f02ec27cbd638d05604b3cbd5dcc2732a62750ced77d32eeab69b92e7eca38fe434121611c8775c314d |
memory/2544-17-0x0000000000A30000-0x0000000000DA4000-memory.dmp
memory/2568-20-0x0000000000A40000-0x0000000000DB4000-memory.dmp
memory/2544-21-0x0000000000A30000-0x0000000000DA4000-memory.dmp
memory/2568-23-0x0000000073DA0000-0x0000000074550000-memory.dmp
memory/2544-22-0x0000000073DA0000-0x0000000074550000-memory.dmp
memory/2544-24-0x00000000060B0000-0x00000000060C0000-memory.dmp
memory/2544-29-0x0000000000A30000-0x0000000000DA4000-memory.dmp
memory/2544-30-0x0000000005F00000-0x0000000005F0A000-memory.dmp
memory/2544-31-0x0000000006400000-0x0000000006466000-memory.dmp
memory/2544-32-0x0000000007300000-0x0000000007318000-memory.dmp
memory/2544-33-0x0000000073DA0000-0x0000000074550000-memory.dmp
memory/2544-34-0x00000000060B0000-0x00000000060C0000-memory.dmp
memory/2544-36-0x0000000007530000-0x000000000753A000-memory.dmp
memory/3084-41-0x0000000000540000-0x00000000008B4000-memory.dmp
memory/3084-43-0x0000000073DA0000-0x0000000074550000-memory.dmp
memory/3084-44-0x0000000000540000-0x00000000008B4000-memory.dmp
memory/3084-45-0x0000000005850000-0x0000000005860000-memory.dmp
memory/3084-49-0x0000000000540000-0x00000000008B4000-memory.dmp
memory/3084-50-0x0000000073DA0000-0x0000000074550000-memory.dmp
memory/4868-57-0x0000000000540000-0x00000000008B4000-memory.dmp
memory/4868-61-0x0000000000540000-0x00000000008B4000-memory.dmp