Analysis
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max time kernel
149s -
max time network
123s -
platform
windows7_x64 -
resource
win7-20240903-en -
resource tags
arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system -
submitted
30/10/2024, 14:53
Static task
static1
Behavioral task
behavioral1
Sample
4ee9ec984e9b67d700a144ce7fdfe785f2b8cc2907ff9ee3b4fc4e7fb7fe0f55N.exe
Resource
win7-20240903-en
Behavioral task
behavioral2
Sample
4ee9ec984e9b67d700a144ce7fdfe785f2b8cc2907ff9ee3b4fc4e7fb7fe0f55N.exe
Resource
win10v2004-20241007-en
General
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Target
4ee9ec984e9b67d700a144ce7fdfe785f2b8cc2907ff9ee3b4fc4e7fb7fe0f55N.exe
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Size
49KB
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MD5
5c4f36b6ad585b5b03f615740f858680
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SHA1
2ce69bf1b549af12dce410996250a4bdcf48faca
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SHA256
4ee9ec984e9b67d700a144ce7fdfe785f2b8cc2907ff9ee3b4fc4e7fb7fe0f55
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SHA512
16e88a0d7a6cb94280dc64150da603fa709d4e94f89fa0ba3cad4f1374fb1a7964fdd36a7c65a9860ff2180cd76e771521e93176b43644b77e082677f9775225
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SSDEEP
768:jIUk6esQOVK0RNBwwboEeQBRsxX7P2A5Ah66ggzEmDmHjQy:jSowgKSHsxX6A2WeDmL
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 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 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 -
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 2448 rmass.exe 2796 rmass.exe -
Loads dropped DLL 3 IoCs
pid Process 2232 4ee9ec984e9b67d700a144ce7fdfe785f2b8cc2907ff9ee3b4fc4e7fb7fe0f55N.exe 2232 4ee9ec984e9b67d700a144ce7fdfe785f2b8cc2907ff9ee3b4fc4e7fb7fe0f55N.exe 2448 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 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 opened for modification C:\Windows\SysWOW64\rmass.exe 4ee9ec984e9b67d700a144ce7fdfe785f2b8cc2907ff9ee3b4fc4e7fb7fe0f55N.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\RECOVER32.DLL 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 created C:\Windows\SysWOW64\rmass.exe 4ee9ec984e9b67d700a144ce7fdfe785f2b8cc2907ff9ee3b4fc4e7fb7fe0f55N.exe File opened for modification 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\rmass.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 -
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 4ee9ec984e9b67d700a144ce7fdfe785f2b8cc2907ff9ee3b4fc4e7fb7fe0f55N.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language rmass.exe -
Suspicious behavior: EnumeratesProcesses 4 IoCs
pid Process 2448 rmass.exe 2448 rmass.exe 2448 rmass.exe 2796 rmass.exe -
Suspicious use of AdjustPrivilegeToken 1 IoCs
description pid Process Token: SeDebugPrivilege 2448 rmass.exe -
Suspicious use of WriteProcessMemory 10 IoCs
description pid Process procid_target PID 2232 wrote to memory of 2448 2232 4ee9ec984e9b67d700a144ce7fdfe785f2b8cc2907ff9ee3b4fc4e7fb7fe0f55N.exe 30 PID 2232 wrote to memory of 2448 2232 4ee9ec984e9b67d700a144ce7fdfe785f2b8cc2907ff9ee3b4fc4e7fb7fe0f55N.exe 30 PID 2232 wrote to memory of 2448 2232 4ee9ec984e9b67d700a144ce7fdfe785f2b8cc2907ff9ee3b4fc4e7fb7fe0f55N.exe 30 PID 2232 wrote to memory of 2448 2232 4ee9ec984e9b67d700a144ce7fdfe785f2b8cc2907ff9ee3b4fc4e7fb7fe0f55N.exe 30 PID 2448 wrote to memory of 432 2448 rmass.exe 5 PID 2448 wrote to memory of 1188 2448 rmass.exe 21 PID 2448 wrote to memory of 2796 2448 rmass.exe 31 PID 2448 wrote to memory of 2796 2448 rmass.exe 31 PID 2448 wrote to memory of 2796 2448 rmass.exe 31 PID 2448 wrote to memory of 2796 2448 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:1188
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C:\Users\Admin\AppData\Local\Temp\4ee9ec984e9b67d700a144ce7fdfe785f2b8cc2907ff9ee3b4fc4e7fb7fe0f55N.exe"C:\Users\Admin\AppData\Local\Temp\4ee9ec984e9b67d700a144ce7fdfe785f2b8cc2907ff9ee3b4fc4e7fb7fe0f55N.exe"2⤵
- Loads dropped DLL
- Drops file in System32 directory
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2232 -
C:\Windows\SysWOW64\rmass.exe"C:\Windows\SysWOW64\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:2448 -
C:\Windows\SysWOW64\rmass.exe--k33p4⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
PID:2796
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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
MD512ff80c93916ec18553163d151a58a22
SHA142b06ecc5e03b767770f3ed0a12953326d0eede3
SHA256144c5d2d4d938ad383d96c96163254b5e757ddb049d30445776f4077580668de
SHA51250c29b2d567c75aa9b1bb2d4966d630a9747cdc50fc0843492a242068d67dc1c4fe418accb3acf6ce17e4831358d9acdab070aa81f673be086c589db6e5b7f67
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Filesize
49KB
MD5938771b91bbd3ba7b25bdc8b518e21b5
SHA17e0466c609401a18d38d3bc2e8d1ceb0e165ef58
SHA25614b1cf610aff17f46287ef18746b3e9c4b9606aa185b23e9519ea9fc446ecd85
SHA512583518cda86bf1b4af285b657fd74dd1eaf255c00a3a3f3849b46767a663d140cf99ba17dba2e08a21205e13fcd99fc35b9e0d37b7846634d3c827408aa4ea7d
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Filesize
50KB
MD54c46f2fab10ddeec17ffd7e34ed9ab0c
SHA180a5ca627b92b0772936462dba953472097dba5b
SHA256c468de351ff15460bf4e92df78508dad06e9ec01426a36d1ccc57f102cabb269
SHA51284142f5ac642768771f63dfb45b10265f8e8af82ddd5b0eb0d85d8f274fc887b76c57bcf36451ad7b0ec88a04ad212119067d1517f360c37994e43fb6f103c9f
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Filesize
1KB
MD5b10b13206b0f2cf3968050072f6979bf
SHA1699db21ba9cecf3f13ac3d76e22cfa41aa94da80
SHA2560eef3217095cb97b695c434e74d6314bf9e869a013d6e9c88e58c34576a276b4
SHA512d33bfd931be6676539507a69101d99fa4c5ef36b12422bd11f063b9b6a47b7444f6c4ad5f35e044714fdb872e96cd9fddf049e8329af1219483887f6ac5f4a5d
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Filesize
46KB
MD5560ad83daaedd76f2e111a3e0fcfcb05
SHA11cb9082ecf83c06ea04a40d8233f5b4e209f78b8
SHA256f3984e23d9b498dfc7bed2ea9c6c07b1b7eee2e796307422368ee1586b60c130
SHA512dae737f0fd6182b66f1d740710b96686e8208fb048e215e6bf990991aafa0faa154c24966e57f9f3d5136c58e51cf1956a4c2dcf3c3817361fde3d3f7e45ca35