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Analysis
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max time kernel
120s -
max time network
119s -
platform
windows10-2004_x64 -
resource
win10v2004-20240802-en -
resource tags
arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system -
submitted
25/08/2024, 01:40
Static task
static1
Behavioral task
behavioral1
Sample
e07cf71aa11eaba37ecaf5b7caf6b4b0N.exe
Resource
win7-20240705-en
Behavioral task
behavioral2
Sample
e07cf71aa11eaba37ecaf5b7caf6b4b0N.exe
Resource
win10v2004-20240802-en
General
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Target
e07cf71aa11eaba37ecaf5b7caf6b4b0N.exe
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Size
44KB
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MD5
e07cf71aa11eaba37ecaf5b7caf6b4b0
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SHA1
1b987d0916443ee56da185987dc483f2d26fd88d
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SHA256
f49585c2301e57fd829eb0ba4f7ad95cccf8ea73f503810f18036de9e3fbe8c4
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SHA512
d42555afdfd09de8c7f5e0aaf7061adce9f676014d7785932af999a3dbfde69aa26dd348c7c1769b3c6ca4f9d9919fe1d85e62f880359bcdce5d5afcd178de55
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SSDEEP
768:WAUJmQCcmLCXQq6fsKiJYsIkjJVzqsVG5kuGVAQvRWrETR5:RUNHFKQbIkHvGkAzWR5
Malware Config
Signatures
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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 -
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\{4F415244-4847-444e-4F41-52444847444e} rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4F415244-4847-444e-4F41-52444847444e}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a" rmass.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4F415244-4847-444e-4F41-52444847444e}\IsInstalled = "1" rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4F415244-4847-444e-4F41-52444847444e}\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 4420 rmass.exe 3800 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 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\ahuy.exe rmass.exe File created C:\Windows\SysWOW64\RECOVER32.DLL rmass.exe File opened for modification C:\Windows\SysWOW64\rmass.exe e07cf71aa11eaba37ecaf5b7caf6b4b0N.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\winrnt.exe rmass.exe 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 rmass.exe File created C:\Windows\SysWOW64\rmass.exe e07cf71aa11eaba37ecaf5b7caf6b4b0N.exe File opened for modification C:\Windows\SysWOW64\ntdbg.exe rmass.exe File opened for modification C:\Windows\SysWOW64\RECOVER32.DLL 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 -
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 e07cf71aa11eaba37ecaf5b7caf6b4b0N.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 4420 rmass.exe 4420 rmass.exe 4420 rmass.exe 4420 rmass.exe 4420 rmass.exe 4420 rmass.exe 3800 rmass.exe 3800 rmass.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 3032 e07cf71aa11eaba37ecaf5b7caf6b4b0N.exe Token: SeDebugPrivilege 4420 rmass.exe -
Suspicious use of WriteProcessMemory 8 IoCs
description pid Process procid_target PID 3032 wrote to memory of 4420 3032 e07cf71aa11eaba37ecaf5b7caf6b4b0N.exe 84 PID 3032 wrote to memory of 4420 3032 e07cf71aa11eaba37ecaf5b7caf6b4b0N.exe 84 PID 3032 wrote to memory of 4420 3032 e07cf71aa11eaba37ecaf5b7caf6b4b0N.exe 84 PID 4420 wrote to memory of 3800 4420 rmass.exe 85 PID 4420 wrote to memory of 3800 4420 rmass.exe 85 PID 4420 wrote to memory of 3800 4420 rmass.exe 85 PID 4420 wrote to memory of 608 4420 rmass.exe 5 PID 4420 wrote to memory of 3332 4420 rmass.exe 56
Processes
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C:\Windows\system32\winlogon.exewinlogon.exe1⤵PID:608
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C:\Windows\Explorer.EXEC:\Windows\Explorer.EXE1⤵PID:3332
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C:\Users\Admin\AppData\Local\Temp\e07cf71aa11eaba37ecaf5b7caf6b4b0N.exe"C:\Users\Admin\AppData\Local\Temp\e07cf71aa11eaba37ecaf5b7caf6b4b0N.exe"2⤵
- Drops file in System32 directory
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3032 -
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:4420 -
C:\Windows\SysWOW64\rmass.exe--k33p4⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
PID:3800
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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
46KB
MD5dee6689d37bffca2beffaff790098531
SHA15bab96fb90a82ba7d30b636b41dee6de4b322bb7
SHA25639a78e7403282566ca954377ad3ad11d5df7bab33de13d428afd7dda25972281
SHA5129ee4d6e7d88da64f129cc3df03f54e76d8128eaf3a43dfb9eb1cbb1a3d849e303dbd73f1aa24a7c85416ddedcea0d894fb486ae0cfb86e29cb14c19784222d01
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Filesize
47KB
MD5f792e4b4bad657a86b9f11f879291ec5
SHA12e8930071c4b42198747a62266f3e4965a0de2fa
SHA256fa7334a7a3c02cb5db9e5e326db8dfc271ca0833889da487c91ccd81ab33a369
SHA512b1b04783ffc86d2fd0f839bc8b06cbb822b09883b0fb7b99e9f3b2d8707e3d08417aad1f12e223c949bbdbb9615602f0857810a94153d74da450926328a35a65
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Filesize
44KB
MD5e07cf71aa11eaba37ecaf5b7caf6b4b0
SHA11b987d0916443ee56da185987dc483f2d26fd88d
SHA256f49585c2301e57fd829eb0ba4f7ad95cccf8ea73f503810f18036de9e3fbe8c4
SHA512d42555afdfd09de8c7f5e0aaf7061adce9f676014d7785932af999a3dbfde69aa26dd348c7c1769b3c6ca4f9d9919fe1d85e62f880359bcdce5d5afcd178de55