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Analysis
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max time kernel
119s -
max time network
94s -
platform
windows10-2004_x64 -
resource
win10v2004-20240802-en -
resource tags
arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system -
submitted
30/09/2024, 19:15
Behavioral task
behavioral1
Sample
a797b8d85a1a3654cf2578b3025e2d265fd9c45ecfea95d7b9c2a08eaa0d9a43N.exe
Resource
win7-20240903-en
Behavioral task
behavioral2
Sample
a797b8d85a1a3654cf2578b3025e2d265fd9c45ecfea95d7b9c2a08eaa0d9a43N.exe
Resource
win10v2004-20240802-en
General
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Target
a797b8d85a1a3654cf2578b3025e2d265fd9c45ecfea95d7b9c2a08eaa0d9a43N.exe
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Size
20KB
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MD5
8fce0865c8cce17a58b7afe940d30380
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SHA1
56e081a51ae2690f2280eabcf6a4b1008261203c
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SHA256
a797b8d85a1a3654cf2578b3025e2d265fd9c45ecfea95d7b9c2a08eaa0d9a43
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SHA512
3f7834ae93dd9e7b68c1b1a9e2e5e02a07169f54072b441200da42d52518413349a1169a00d5a06ffaf460b5f0081cc88ce6eb421d2e9550a034e85230f52c7f
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SSDEEP
384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvXziCybr:rRkiLw3HsDSARGG/jfer
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\{44534559-5855-4f44-4453-455958554f44}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a" rmass.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{44534559-5855-4f44-4453-455958554f44}\IsInstalled = "1" rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{44534559-5855-4f44-4453-455958554f44}\StubPath = "C:\\Windows\\system32\\ahuy.exe" rmass.exe Key created \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{44534559-5855-4f44-4453-455958554f44} 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 3992 rmass.exe 3288 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\rmass.exe rmass.exe File created C:\Windows\SysWOW64\rmass.exe a797b8d85a1a3654cf2578b3025e2d265fd9c45ecfea95d7b9c2a08eaa0d9a43N.exe File opened for modification C:\Windows\SysWOW64\ntdbg.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\aset32.exe rmass.exe File opened for modification C:\Windows\SysWOW64\idbg32.exe rmass.exe File opened for modification C:\Windows\SysWOW64\rmass.exe a797b8d85a1a3654cf2578b3025e2d265fd9c45ecfea95d7b9c2a08eaa0d9a43N.exe File created C:\Windows\SysWOW64\ntdbg.exe rmass.exe File opened for modification C:\Windows\SysWOW64\ahuy.exe rmass.exe File created C:\Windows\SysWOW64\ahuy.exe rmass.exe File opened for modification C:\Windows\SysWOW64\winrnt.exe rmass.exe -
resource yara_rule behavioral2/memory/3352-0-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral2/files/0x0009000000023459-5.dat upx behavioral2/memory/3352-7-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral2/memory/3288-18-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral2/memory/3992-43-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral2/memory/3288-48-0x0000000000400000-0x0000000000411000-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\idbg32.exe rmass.exe 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 -
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 a797b8d85a1a3654cf2578b3025e2d265fd9c45ecfea95d7b9c2a08eaa0d9a43N.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 3992 rmass.exe 3992 rmass.exe 3992 rmass.exe 3992 rmass.exe 3992 rmass.exe 3992 rmass.exe 3288 rmass.exe 3288 rmass.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 3352 a797b8d85a1a3654cf2578b3025e2d265fd9c45ecfea95d7b9c2a08eaa0d9a43N.exe Token: SeDebugPrivilege 3992 rmass.exe -
Suspicious use of WriteProcessMemory 8 IoCs
description pid Process procid_target PID 3352 wrote to memory of 3992 3352 a797b8d85a1a3654cf2578b3025e2d265fd9c45ecfea95d7b9c2a08eaa0d9a43N.exe 82 PID 3352 wrote to memory of 3992 3352 a797b8d85a1a3654cf2578b3025e2d265fd9c45ecfea95d7b9c2a08eaa0d9a43N.exe 82 PID 3352 wrote to memory of 3992 3352 a797b8d85a1a3654cf2578b3025e2d265fd9c45ecfea95d7b9c2a08eaa0d9a43N.exe 82 PID 3992 wrote to memory of 3288 3992 rmass.exe 83 PID 3992 wrote to memory of 3288 3992 rmass.exe 83 PID 3992 wrote to memory of 3288 3992 rmass.exe 83 PID 3992 wrote to memory of 608 3992 rmass.exe 5 PID 3992 wrote to memory of 3380 3992 rmass.exe 55
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:3380
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C:\Users\Admin\AppData\Local\Temp\a797b8d85a1a3654cf2578b3025e2d265fd9c45ecfea95d7b9c2a08eaa0d9a43N.exe"C:\Users\Admin\AppData\Local\Temp\a797b8d85a1a3654cf2578b3025e2d265fd9c45ecfea95d7b9c2a08eaa0d9a43N.exe"2⤵
- Drops file in System32 directory
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3352 -
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:3992 -
C:\Windows\SysWOW64\rmass.exe--k33p4⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
PID:3288
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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
22KB
MD5c4b60212f9f1bc1b63b7f9e7cf51d5ea
SHA1663416dfe685acb7269af6f2207b719b28e7c50f
SHA256d51d407cace6a95dc81c1985ffed4b6040332bdb764a51071a40eafc5c91ded4
SHA512d147c04f7ecb1567d0d5e88215a304d654f34db40443ad8da8495e18fe23e61feefe627266bacf4d9e2ab0d47a4a15aceb05ffae273f7edaf1e02332ca83b335
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Filesize
23KB
MD5154df2788255430979347fea4ced6a29
SHA1d3b3917246eb4838f7d611f64c7c18dc0146daeb
SHA256188b1444cc253ab668d8970b2afacfb2b66a7a7968857821542f2d07bbbc1920
SHA512bcc10766f8b1d143c45406a826aa404e2f44a0d64c94fe7459c95722f35548ff23b612891361055e7553355c12449a8fe86283f073ab6056ea3fda1c7ceaea42
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Filesize
20KB
MD58fce0865c8cce17a58b7afe940d30380
SHA156e081a51ae2690f2280eabcf6a4b1008261203c
SHA256a797b8d85a1a3654cf2578b3025e2d265fd9c45ecfea95d7b9c2a08eaa0d9a43
SHA5123f7834ae93dd9e7b68c1b1a9e2e5e02a07169f54072b441200da42d52518413349a1169a00d5a06ffaf460b5f0081cc88ce6eb421d2e9550a034e85230f52c7f