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Analysis
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max time kernel
119s -
max time network
40s -
platform
windows7_x64 -
resource
win7-20240705-en -
resource tags
arch:x64arch:x86image:win7-20240705-enlocale:en-usos:windows7-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 Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{50534251-5746-5954-5053-425157465954}\StubPath = "C:\\Windows\\system32\\ahuy.exe" rmass.exe Key created \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{50534251-5746-5954-5053-425157465954} rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{50534251-5746-5954-5053-425157465954}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a" rmass.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{50534251-5746-5954-5053-425157465954}\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 2516 rmass.exe 2068 rmass.exe -
Loads dropped DLL 3 IoCs
pid Process 1320 e07cf71aa11eaba37ecaf5b7caf6b4b0N.exe 1320 e07cf71aa11eaba37ecaf5b7caf6b4b0N.exe 2516 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}\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 Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\{BC84DF00-BC38-9902-8082-6FCBF2D87A0B}\012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345 = "a" rmass.exe -
Drops file in System32 directory 12 IoCs
description ioc Process File created C:\Windows\SysWOW64\rmass.exe e07cf71aa11eaba37ecaf5b7caf6b4b0N.exe File created 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\RECOVER32.DLL rmass.exe File created C:\Windows\SysWOW64\RECOVER32.DLL 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 opened for modification C:\Windows\SysWOW64\rmass.exe e07cf71aa11eaba37ecaf5b7caf6b4b0N.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 -
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 rmass.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language e07cf71aa11eaba37ecaf5b7caf6b4b0N.exe -
Suspicious behavior: EnumeratesProcesses 4 IoCs
pid Process 2516 rmass.exe 2516 rmass.exe 2516 rmass.exe 2068 rmass.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 1320 e07cf71aa11eaba37ecaf5b7caf6b4b0N.exe Token: SeDebugPrivilege 2516 rmass.exe -
Suspicious use of WriteProcessMemory 10 IoCs
description pid Process procid_target PID 1320 wrote to memory of 2516 1320 e07cf71aa11eaba37ecaf5b7caf6b4b0N.exe 30 PID 1320 wrote to memory of 2516 1320 e07cf71aa11eaba37ecaf5b7caf6b4b0N.exe 30 PID 1320 wrote to memory of 2516 1320 e07cf71aa11eaba37ecaf5b7caf6b4b0N.exe 30 PID 1320 wrote to memory of 2516 1320 e07cf71aa11eaba37ecaf5b7caf6b4b0N.exe 30 PID 2516 wrote to memory of 428 2516 rmass.exe 5 PID 2516 wrote to memory of 1200 2516 rmass.exe 21 PID 2516 wrote to memory of 2068 2516 rmass.exe 31 PID 2516 wrote to memory of 2068 2516 rmass.exe 31 PID 2516 wrote to memory of 2068 2516 rmass.exe 31 PID 2516 wrote to memory of 2068 2516 rmass.exe 31
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:1200
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C:\Users\Admin\AppData\Local\Temp\e07cf71aa11eaba37ecaf5b7caf6b4b0N.exe"C:\Users\Admin\AppData\Local\Temp\e07cf71aa11eaba37ecaf5b7caf6b4b0N.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:1320 -
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:2516 -
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
46KB
MD56f23ed1a6cca722f8a3850e2dd8a98c3
SHA11c923200b65331ee643d1f39c03ae32054c68b96
SHA2568a33b5d79858697c06458c232ac5f9d122c6fb134b38e80d054a1b9c95c7f99b
SHA5121a5af89a828ce9aab36a79003130f202d135586242ddb163442b3365c9481630f3de7ef570f96838d90f44b7271d86fec4c017732b0c8dbfbd124344ebd633e1
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Filesize
47KB
MD576465404011692aee7b7b23a0e21f7d8
SHA1507f9c378adc1c3a404da132680eb838a8159ea3
SHA25651a73f50d54f9c2ff9d01d9d4cb60a004fb1dad657335b796d3077365e901276
SHA512b89b19e649f159ac3057f028006dc6a901ec52facdbe28ed6d549f15eac28b2cbc3d0f34c4cadadcb7d7110ac06a037507442d4b3454da74d5b63209a6ce6925
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Filesize
44KB
MD5e07cf71aa11eaba37ecaf5b7caf6b4b0
SHA11b987d0916443ee56da185987dc483f2d26fd88d
SHA256f49585c2301e57fd829eb0ba4f7ad95cccf8ea73f503810f18036de9e3fbe8c4
SHA512d42555afdfd09de8c7f5e0aaf7061adce9f676014d7785932af999a3dbfde69aa26dd348c7c1769b3c6ca4f9d9919fe1d85e62f880359bcdce5d5afcd178de55