Analysis
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max time kernel
149s -
max time network
121s -
platform
windows7_x64 -
resource
win7-20240903-en -
resource tags
arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system -
submitted
22-11-2024 05:50
Behavioral task
behavioral1
Sample
f7351352b9f84dc9c7b84d777fbc272ca7cd375e1e0dfe155b7eab87d14d4e4a.exe
Resource
win7-20240903-en
Behavioral task
behavioral2
Sample
f7351352b9f84dc9c7b84d777fbc272ca7cd375e1e0dfe155b7eab87d14d4e4a.exe
Resource
win10v2004-20241007-en
General
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Target
f7351352b9f84dc9c7b84d777fbc272ca7cd375e1e0dfe155b7eab87d14d4e4a.exe
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Size
64KB
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MD5
8134176e18b5250d91d40bb57e527d3e
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SHA1
21809d9f620329283297b4f81348426595744fa3
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SHA256
f7351352b9f84dc9c7b84d777fbc272ca7cd375e1e0dfe155b7eab87d14d4e4a
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SHA512
d9c450a1d9088d7d2b7fe23c12f9c2c9303b4c46a4d040db8e163cda1961daa3e2f5471354b57dcf47b55cc2f24ae6d7cba6e4635d3f292e950af0790f60bf97
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SSDEEP
768:vAUJmQCcmLCXQq6fsKiJYsIkjJVzqsVG5kuGKQLddOW/U4Wv84EFe:YUNHFKQbIkHvGMdOb4mse
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\{5850414A-4f54-4959-5850-414A4F544959} rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{5850414A-4f54-4959-5850-414A4F544959}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a" rmass.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{5850414A-4f54-4959-5850-414A4F544959}\IsInstalled = "1" rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{5850414A-4f54-4959-5850-414A4F544959}\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\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 Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exe rmass.exe -
Executes dropped EXE 2 IoCs
pid Process 2544 rmass.exe 2068 rmass.exe -
Loads dropped DLL 3 IoCs
pid Process 2500 f7351352b9f84dc9c7b84d777fbc272ca7cd375e1e0dfe155b7eab87d14d4e4a.exe 2500 f7351352b9f84dc9c7b84d777fbc272ca7cd375e1e0dfe155b7eab87d14d4e4a.exe 2544 rmass.exe -
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 -
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\idbg32.exe rmass.exe File opened for modification C:\Windows\SysWOW64\rmass.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 created C:\Windows\SysWOW64\ahuy.exe rmass.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\rmass.exe f7351352b9f84dc9c7b84d777fbc272ca7cd375e1e0dfe155b7eab87d14d4e4a.exe File created C:\Windows\SysWOW64\rmass.exe f7351352b9f84dc9c7b84d777fbc272ca7cd375e1e0dfe155b7eab87d14d4e4a.exe File opened for modification C:\Windows\SysWOW64\ntdbg.exe rmass.exe -
resource yara_rule behavioral1/memory/2500-0-0x0000000000400000-0x0000000000412000-memory.dmp upx behavioral1/files/0x000b000000012029-7.dat upx behavioral1/memory/2544-12-0x0000000000400000-0x0000000000412000-memory.dmp upx behavioral1/memory/2500-10-0x0000000000400000-0x0000000000412000-memory.dmp upx behavioral1/memory/2544-45-0x0000000000400000-0x0000000000412000-memory.dmp upx behavioral1/memory/2068-53-0x0000000000400000-0x0000000000412000-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\aset32.exe rmass.exe File opened for modification C:\Program Files (x86)\Common Files\System\idbg32.exe rmass.exe File opened for modification C:\Program Files (x86)\Common Files\System\winrnt.exe rmass.exe -
System Location Discovery: System Language Discovery 1 TTPs 2 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 f7351352b9f84dc9c7b84d777fbc272ca7cd375e1e0dfe155b7eab87d14d4e4a.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language rmass.exe -
Suspicious behavior: EnumeratesProcesses 4 IoCs
pid Process 2544 rmass.exe 2544 rmass.exe 2544 rmass.exe 2068 rmass.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 2500 f7351352b9f84dc9c7b84d777fbc272ca7cd375e1e0dfe155b7eab87d14d4e4a.exe Token: SeDebugPrivilege 2544 rmass.exe -
Suspicious use of WriteProcessMemory 10 IoCs
description pid Process procid_target PID 2500 wrote to memory of 2544 2500 f7351352b9f84dc9c7b84d777fbc272ca7cd375e1e0dfe155b7eab87d14d4e4a.exe 30 PID 2500 wrote to memory of 2544 2500 f7351352b9f84dc9c7b84d777fbc272ca7cd375e1e0dfe155b7eab87d14d4e4a.exe 30 PID 2500 wrote to memory of 2544 2500 f7351352b9f84dc9c7b84d777fbc272ca7cd375e1e0dfe155b7eab87d14d4e4a.exe 30 PID 2500 wrote to memory of 2544 2500 f7351352b9f84dc9c7b84d777fbc272ca7cd375e1e0dfe155b7eab87d14d4e4a.exe 30 PID 2544 wrote to memory of 2068 2544 rmass.exe 31 PID 2544 wrote to memory of 2068 2544 rmass.exe 31 PID 2544 wrote to memory of 2068 2544 rmass.exe 31 PID 2544 wrote to memory of 2068 2544 rmass.exe 31 PID 2544 wrote to memory of 428 2544 rmass.exe 5 PID 2544 wrote to memory of 1176 2544 rmass.exe 21
Processes
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C:\Windows\system32\winlogon.exewinlogon.exe1⤵PID:428
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C:\Windows\Explorer.EXEC:\Windows\Explorer.EXE1⤵PID:1176
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C:\Users\Admin\AppData\Local\Temp\f7351352b9f84dc9c7b84d777fbc272ca7cd375e1e0dfe155b7eab87d14d4e4a.exe"C:\Users\Admin\AppData\Local\Temp\f7351352b9f84dc9c7b84d777fbc272ca7cd375e1e0dfe155b7eab87d14d4e4a.exe"2⤵
- Loads dropped DLL
- Drops file in System32 directory
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2500 -
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
- 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:2544 -
C:\Windows\SysWOW64\rmass.exe--k33p4⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
PID:2068
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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
66KB
MD563d1f433fe3068fd3fa89d3ae3270f34
SHA17276b923095d4da6371c984151f7a37d7c112a74
SHA256fa9768a1ffb8be18e047201bffbfba5e2273a5f039cac2825d7ce7e1d25f3e66
SHA5124a5acb8d889eb4587ecea0c33c5c94311530910537b8980a2e7ead1e7cc8bb78bd01656ec80e830edad9700ef8e8b364c6aa7d425eacf73267b4a8e38772d6b1
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Filesize
67KB
MD596acf3bf1b716c3e8770e8a309dc5f13
SHA14887670493f6e3582df73ada8e4b99df35197744
SHA256933a545f9924cb2a72387f551f119ac667ce8e746be28855f7e4215fb9bcb388
SHA512d346bf4f0ee0fd936630afa54905e832fa5354d4f32747cc45912901491a28e7be0e7a969cf9b6682f126f766c85347244a30d9477153c08beadfd3d1c67b410
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Filesize
64KB
MD58134176e18b5250d91d40bb57e527d3e
SHA121809d9f620329283297b4f81348426595744fa3
SHA256f7351352b9f84dc9c7b84d777fbc272ca7cd375e1e0dfe155b7eab87d14d4e4a
SHA512d9c450a1d9088d7d2b7fe23c12f9c2c9303b4c46a4d040db8e163cda1961daa3e2f5471354b57dcf47b55cc2f24ae6d7cba6e4635d3f292e950af0790f60bf97
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Filesize
1KB
MD5b10b13206b0f2cf3968050072f6979bf
SHA1699db21ba9cecf3f13ac3d76e22cfa41aa94da80
SHA2560eef3217095cb97b695c434e74d6314bf9e869a013d6e9c88e58c34576a276b4
SHA512d33bfd931be6676539507a69101d99fa4c5ef36b12422bd11f063b9b6a47b7444f6c4ad5f35e044714fdb872e96cd9fddf049e8329af1219483887f6ac5f4a5d