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Analysis
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max time kernel
149s -
max time network
120s -
platform
windows7_x64 -
resource
win7-20240708-en -
resource tags
arch:x64arch:x86image:win7-20240708-enlocale:en-usos:windows7-x64system -
submitted
10/07/2024, 19:22
Static task
static1
Behavioral task
behavioral1
Sample
161808cf2c7e8288bbd15b60bdbd0afc4d568f5d0eebc959278ed25eb1f04c93.exe
Resource
win7-20240708-en
Behavioral task
behavioral2
Sample
161808cf2c7e8288bbd15b60bdbd0afc4d568f5d0eebc959278ed25eb1f04c93.exe
Resource
win10v2004-20240709-en
General
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Target
161808cf2c7e8288bbd15b60bdbd0afc4d568f5d0eebc959278ed25eb1f04c93.exe
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Size
45KB
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MD5
cc60b3a26d75bd3698cf62e8bb0c73e9
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SHA1
d8624de6dcc1c8fd70f4db8435589244e965c9cd
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SHA256
161808cf2c7e8288bbd15b60bdbd0afc4d568f5d0eebc959278ed25eb1f04c93
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SHA512
d49b91b4bd1037c4c61932a70f55fbeb8267408efaade11e4de2c4b75ba3a179c0994ee94e75a150b3756c08ed72c0c8cbbd064196aaccd46a7407cd964a619b
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SSDEEP
768:WAUJmQCcmLCXQq6fsKiJYsIkjJVzqsVG5kuGVAQvKMb7r1:RUNHFKQbIkHvGkAFu7J
Malware Config
Signatures
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description ioc Process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\FirewallDisableNotify = "5120" rmass.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\UpdatesDisableNotify = "5120" rmass.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\AntiVirusOverride = "5120" rmass.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\AntiVirusDisableNotify = "5120" rmass.exe -
Boot or Logon Autostart Execution: Active Setup 2 TTPs 4 IoCs
Adversaries may achieve persistence by adding a Registry key to the Active Setup of the local machine.
description ioc Process Key created \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4D475757-4159-594e-4D47-57574159594e} rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4D475757-4159-594e-4D47-57574159594e}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a" rmass.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4D475757-4159-594e-4D47-57574159594e}\IsInstalled = "1" rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4D475757-4159-594e-4D47-57574159594e}\StubPath = "C:\\Windows\\system32\\ahuy.exe" rmass.exe -
Drops file in Drivers directory 1 IoCs
description ioc Process File opened for modification C:\Windows\system32\drivers\etc\hosts rmass.exe -
Event Triggered Execution: Image File Execution Options Injection 1 TTPs 3 IoCs
description ioc Process Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exe rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exe\0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890 = "a" rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exe\Debugger = "C:\\Windows\\system32\\ntdbg.exe" rmass.exe -
Executes dropped EXE 2 IoCs
pid Process 2184 rmass.exe 3040 rmass.exe -
Loads dropped DLL 3 IoCs
pid Process 1572 161808cf2c7e8288bbd15b60bdbd0afc4d568f5d0eebc959278ed25eb1f04c93.exe 1572 161808cf2c7e8288bbd15b60bdbd0afc4d568f5d0eebc959278ed25eb1f04c93.exe 2184 rmass.exe -
description ioc Process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\UpdatesDisableNotify = "5120" rmass.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\AntiVirusOverride = "5120" rmass.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\AntiVirusDisableNotify = "5120" rmass.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\FirewallDisableNotify = "5120" rmass.exe -
Modifies WinLogon 2 TTPs 5 IoCs
description ioc Process Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\{BC84DF00-BC38-9902-8082-6FCBF2D87A0B}\012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345 = "a" rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\{BC84DF00-BC38-9902-8082-6FCBF2D87A0B}\DLLName = "C:\\Windows\\system32\\RECOVER32.DLL" rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\{BC84DF00-BC38-9902-8082-6FCBF2D87A0B}\Startup = "Startup" rmass.exe Key created \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\{BC84DF00-BC38-9902-8082-6FCBF2D87A0B} rmass.exe Key created \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify rmass.exe -
Drops file in System32 directory 12 IoCs
description ioc Process File created C:\Windows\SysWOW64\rmass.exe 161808cf2c7e8288bbd15b60bdbd0afc4d568f5d0eebc959278ed25eb1f04c93.exe File opened for modification C:\Windows\SysWOW64\ntdbg.exe rmass.exe File created C:\Windows\SysWOW64\ntdbg.exe rmass.exe File opened for modification C:\Windows\SysWOW64\ahuy.exe rmass.exe File opened for modification C:\Windows\SysWOW64\aset32.exe rmass.exe File opened for modification C:\Windows\SysWOW64\rmass.exe rmass.exe File opened for modification C:\Windows\SysWOW64\rmass.exe 161808cf2c7e8288bbd15b60bdbd0afc4d568f5d0eebc959278ed25eb1f04c93.exe File opened for modification C:\Windows\SysWOW64\RECOVER32.DLL rmass.exe File created C:\Windows\SysWOW64\RECOVER32.DLL rmass.exe File opened for modification C:\Windows\SysWOW64\winrnt.exe rmass.exe File opened for modification C:\Windows\SysWOW64\idbg32.exe rmass.exe File created C:\Windows\SysWOW64\ahuy.exe rmass.exe -
Drops file in Program Files directory 3 IoCs
description ioc Process File opened for modification C:\Program Files (x86)\Common Files\System\winrnt.exe rmass.exe File opened for modification C:\Program Files (x86)\Common Files\System\aset32.exe rmass.exe File opened for modification C:\Program Files (x86)\Common Files\System\idbg32.exe rmass.exe -
Suspicious behavior: EnumeratesProcesses 4 IoCs
pid Process 2184 rmass.exe 2184 rmass.exe 2184 rmass.exe 3040 rmass.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 1572 161808cf2c7e8288bbd15b60bdbd0afc4d568f5d0eebc959278ed25eb1f04c93.exe Token: SeDebugPrivilege 2184 rmass.exe -
Suspicious use of WriteProcessMemory 10 IoCs
description pid Process procid_target PID 1572 wrote to memory of 2184 1572 161808cf2c7e8288bbd15b60bdbd0afc4d568f5d0eebc959278ed25eb1f04c93.exe 30 PID 1572 wrote to memory of 2184 1572 161808cf2c7e8288bbd15b60bdbd0afc4d568f5d0eebc959278ed25eb1f04c93.exe 30 PID 1572 wrote to memory of 2184 1572 161808cf2c7e8288bbd15b60bdbd0afc4d568f5d0eebc959278ed25eb1f04c93.exe 30 PID 1572 wrote to memory of 2184 1572 161808cf2c7e8288bbd15b60bdbd0afc4d568f5d0eebc959278ed25eb1f04c93.exe 30 PID 2184 wrote to memory of 432 2184 rmass.exe 5 PID 2184 wrote to memory of 1196 2184 rmass.exe 21 PID 2184 wrote to memory of 3040 2184 rmass.exe 31 PID 2184 wrote to memory of 3040 2184 rmass.exe 31 PID 2184 wrote to memory of 3040 2184 rmass.exe 31 PID 2184 wrote to memory of 3040 2184 rmass.exe 31
Processes
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C:\Windows\system32\winlogon.exewinlogon.exe1⤵PID:432
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C:\Windows\Explorer.EXEC:\Windows\Explorer.EXE1⤵PID:1196
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C:\Users\Admin\AppData\Local\Temp\161808cf2c7e8288bbd15b60bdbd0afc4d568f5d0eebc959278ed25eb1f04c93.exe"C:\Users\Admin\AppData\Local\Temp\161808cf2c7e8288bbd15b60bdbd0afc4d568f5d0eebc959278ed25eb1f04c93.exe"2⤵
- Loads dropped DLL
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1572 -
C:\Windows\SysWOW64\rmass.exe"C:\Windows\system32\rmass.exe"3⤵
- Windows security bypass
- Boot or Logon Autostart Execution: Active Setup
- Drops file in Drivers directory
- Event Triggered Execution: Image File Execution Options Injection
- Executes dropped EXE
- Loads dropped DLL
- Windows security modification
- Modifies WinLogon
- Drops file in System32 directory
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2184 -
C:\Windows\SysWOW64\rmass.exe--k33p4⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
PID:3040
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Network
MITRE ATT&CK Enterprise v15
Persistence
Boot or Logon Autostart Execution
2Active Setup
1Winlogon Helper DLL
1Event Triggered Execution
1Image File Execution Options Injection
1Replay Monitor
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Downloads
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Filesize
5KB
MD52b2c28a7a01f9584fe220ef84003427f
SHA15fc023df0b5064045eb8de7f2dbe26f07f6fec70
SHA2569e00af53b1d0c0f5270d94a666d95aa7b4dcb9fea49487c210c055c9dcfcc9eb
SHA51239192a8a91dec1abff25af8dac0cf39da4dfd51b3fb4f1ef0b4e776185d4280fbe8387c2ea778da7bbf2ce288b0bce4d23cbe8d9e87bbd250159044f5adbac78
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Filesize
47KB
MD51928d849a4e49b47b2a82837429562f7
SHA149427a11fe1ece01da2d89ed4017560bc1c23df1
SHA2566e0f4072531875a058e569d05d3b363273a7566b9d6b84ebb12de14c183b66f3
SHA5128258761c751b323c3c852f314afba2d4c766d3f1962f0d54d7c646c59a995b13fbb684a34967c816c18602679e9bdb96b2ea1a135d67bcbfc536557793b51452
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Filesize
48KB
MD5e65b1b2a36d600797f5d5ce8d65767f3
SHA1375bce3062039c754bb9a3f213a3e4d8fd625198
SHA2565b3663d9563ef09c1a9083dcfa383ca21c9bb264abe10ed6bd91f4ab59e37f27
SHA5120917de847afd453bbe038a1258664f00bc46ce1d1aca619a7910b4da95bd7b9b99e31e3bbc345a6a3e1b152fe4ada095593a9b515a8d5f49fff923219f310abd
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Filesize
45KB
MD5cc60b3a26d75bd3698cf62e8bb0c73e9
SHA1d8624de6dcc1c8fd70f4db8435589244e965c9cd
SHA256161808cf2c7e8288bbd15b60bdbd0afc4d568f5d0eebc959278ed25eb1f04c93
SHA512d49b91b4bd1037c4c61932a70f55fbeb8267408efaade11e4de2c4b75ba3a179c0994ee94e75a150b3756c08ed72c0c8cbbd064196aaccd46a7407cd964a619b
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Filesize
1KB
MD5b10b13206b0f2cf3968050072f6979bf
SHA1699db21ba9cecf3f13ac3d76e22cfa41aa94da80
SHA2560eef3217095cb97b695c434e74d6314bf9e869a013d6e9c88e58c34576a276b4
SHA512d33bfd931be6676539507a69101d99fa4c5ef36b12422bd11f063b9b6a47b7444f6c4ad5f35e044714fdb872e96cd9fddf049e8329af1219483887f6ac5f4a5d