Analysis
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max time kernel
119s -
max time network
95s -
platform
windows10-2004_x64 -
resource
win10v2004-20241007-en -
resource tags
arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system -
submitted
22-11-2024 06:59
Behavioral task
behavioral1
Sample
0c4fad799f1b08ad735cb51c58060247b1bb0cd66d61c549fd5c80b74f2eaad6N.exe
Resource
win7-20240903-en
Behavioral task
behavioral2
Sample
0c4fad799f1b08ad735cb51c58060247b1bb0cd66d61c549fd5c80b74f2eaad6N.exe
Resource
win10v2004-20241007-en
General
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Target
0c4fad799f1b08ad735cb51c58060247b1bb0cd66d61c549fd5c80b74f2eaad6N.exe
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Size
22KB
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MD5
a3f1dbd84f728363a1a212e923a97080
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SHA1
c5c47944d63f15d6eafea8e31f18d43f2290ed0e
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SHA256
0c4fad799f1b08ad735cb51c58060247b1bb0cd66d61c549fd5c80b74f2eaad6
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SHA512
2638e5efdf2d0b879abf2f9e28610ff7e6a9765266efacaef8ee3b01253e7d611e7efadb779168c36f0745dbcad43fd79f219555ac305e004902c22df40518d6
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SSDEEP
384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvXVB7JmvY1j:rRkiLw3HsDSARGG/rv1j
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\{47554D4C-4e4c-4645-4755-4D4C4E4C4645} rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{47554D4C-4e4c-4645-4755-4D4C4E4C4645}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a" rmass.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{47554D4C-4e4c-4645-4755-4D4C4E4C4645}\IsInstalled = "1" rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{47554D4C-4e4c-4645-4755-4D4C4E4C4645}\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 Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exe\Debugger = "C:\\Windows\\system32\\ntdbg.exe" rmass.exe 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 -
Executes dropped EXE 2 IoCs
pid Process 4172 rmass.exe 3600 rmass.exe -
description ioc Process 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 Set value (int) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\UpdatesDisableNotify = "5120" rmass.exe -
description ioc Process Delete value \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exe\Debugger rmass.exe -
Modifies WinLogon 2 TTPs 5 IoCs
description ioc Process 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 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 -
Drops file in System32 directory 12 IoCs
description ioc Process File opened for modification C:\Windows\SysWOW64\aset32.exe rmass.exe File opened for modification C:\Windows\SysWOW64\idbg32.exe rmass.exe File opened for modification C:\Windows\SysWOW64\rmass.exe 0c4fad799f1b08ad735cb51c58060247b1bb0cd66d61c549fd5c80b74f2eaad6N.exe File created C:\Windows\SysWOW64\ntdbg.exe rmass.exe File created C:\Windows\SysWOW64\ahuy.exe rmass.exe File created C:\Windows\SysWOW64\RECOVER32.DLL rmass.exe File opened for modification C:\Windows\SysWOW64\winrnt.exe rmass.exe File created C:\Windows\SysWOW64\rmass.exe 0c4fad799f1b08ad735cb51c58060247b1bb0cd66d61c549fd5c80b74f2eaad6N.exe File opened for modification 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\RECOVER32.DLL rmass.exe File opened for modification C:\Windows\SysWOW64\rmass.exe rmass.exe -
resource yara_rule behavioral2/memory/2364-0-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral2/files/0x000c000000023b25-5.dat upx behavioral2/memory/2364-7-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral2/memory/4172-42-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral2/memory/3600-47-0x0000000000400000-0x0000000000411000-memory.dmp upx -
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 -
System Location Discovery: System Language Discovery 1 TTPs 3 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
description ioc Process Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language 0c4fad799f1b08ad735cb51c58060247b1bb0cd66d61c549fd5c80b74f2eaad6N.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language rmass.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language rmass.exe -
Suspicious behavior: EnumeratesProcesses 8 IoCs
pid Process 4172 rmass.exe 4172 rmass.exe 4172 rmass.exe 4172 rmass.exe 4172 rmass.exe 4172 rmass.exe 3600 rmass.exe 3600 rmass.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 2364 0c4fad799f1b08ad735cb51c58060247b1bb0cd66d61c549fd5c80b74f2eaad6N.exe Token: SeDebugPrivilege 4172 rmass.exe -
Suspicious use of WriteProcessMemory 8 IoCs
description pid Process procid_target PID 2364 wrote to memory of 4172 2364 0c4fad799f1b08ad735cb51c58060247b1bb0cd66d61c549fd5c80b74f2eaad6N.exe 83 PID 2364 wrote to memory of 4172 2364 0c4fad799f1b08ad735cb51c58060247b1bb0cd66d61c549fd5c80b74f2eaad6N.exe 83 PID 2364 wrote to memory of 4172 2364 0c4fad799f1b08ad735cb51c58060247b1bb0cd66d61c549fd5c80b74f2eaad6N.exe 83 PID 4172 wrote to memory of 3600 4172 rmass.exe 84 PID 4172 wrote to memory of 3600 4172 rmass.exe 84 PID 4172 wrote to memory of 3600 4172 rmass.exe 84 PID 4172 wrote to memory of 612 4172 rmass.exe 5 PID 4172 wrote to memory of 3484 4172 rmass.exe 56
Processes
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C:\Windows\system32\winlogon.exewinlogon.exe1⤵PID:612
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C:\Windows\Explorer.EXEC:\Windows\Explorer.EXE1⤵PID:3484
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C:\Users\Admin\AppData\Local\Temp\0c4fad799f1b08ad735cb51c58060247b1bb0cd66d61c549fd5c80b74f2eaad6N.exe"C:\Users\Admin\AppData\Local\Temp\0c4fad799f1b08ad735cb51c58060247b1bb0cd66d61c549fd5c80b74f2eaad6N.exe"2⤵
- Drops file in System32 directory
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2364 -
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
- Windows security modification
- Indicator Removal: Clear Persistence
- Modifies WinLogon
- Drops file in System32 directory
- Drops file in Program Files directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4172 -
C:\Windows\SysWOW64\rmass.exe--k33p4⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
PID:3600
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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
1Privilege Escalation
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
24KB
MD5a165809c4211584179bd1135f26304d8
SHA164d912c797ea6f9baeeb8da0aa79614801f3490b
SHA256f319e30a229287f6f6b44ecb050fd7fcb56a2d34d51f762f722ac13fe513647f
SHA512d9d542d7401bd5fa8836da4f77768eee7232ee084708ded93ab08a224a845b0d784b0d6a1cb315c0442e22604d16a7a5e01d12e9977a0fb32829a5ccf906cd05
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Filesize
25KB
MD5cf5bd6c9d51cb13d95baf45212117f21
SHA10b1306451ba0808ed438dae93b13552136396cd6
SHA25673772d354286b16bb7f22508de41a010c2a21a4d9d07444927ed8dc6211cfe5d
SHA512ef72131425623f067c75071e8909334881fc324fded67bd9f02a8eb1940eedcc733ef3af2d18ecd113564a3652151c93a34403fd6e0c425697be7a09745d65ac
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Filesize
22KB
MD5a3f1dbd84f728363a1a212e923a97080
SHA1c5c47944d63f15d6eafea8e31f18d43f2290ed0e
SHA2560c4fad799f1b08ad735cb51c58060247b1bb0cd66d61c549fd5c80b74f2eaad6
SHA5122638e5efdf2d0b879abf2f9e28610ff7e6a9765266efacaef8ee3b01253e7d611e7efadb779168c36f0745dbcad43fd79f219555ac305e004902c22df40518d6