Analysis
-
max time kernel
119s -
max time network
108s -
platform
windows10-2004_x64 -
resource
win10v2004-20241007-en -
resource tags
arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system -
submitted
04/11/2024, 04:59
Behavioral task
behavioral1
Sample
52477199561794e3f8e5871c0226cc4d267f039ff66535554d4be1e19796fdd6N.exe
Resource
win7-20241010-en
Behavioral task
behavioral2
Sample
52477199561794e3f8e5871c0226cc4d267f039ff66535554d4be1e19796fdd6N.exe
Resource
win10v2004-20241007-en
General
-
Target
52477199561794e3f8e5871c0226cc4d267f039ff66535554d4be1e19796fdd6N.exe
-
Size
64KB
-
MD5
58cc7772895672f3c1ad1eb2b089f080
-
SHA1
3411881e2c0c92d496a310736aa4c7f6892fcefc
-
SHA256
52477199561794e3f8e5871c0226cc4d267f039ff66535554d4be1e19796fdd6
-
SHA512
508320d35dec15ef7fa906a178d81e74d650e0464dc099d0806030a0d9f6c2e17fac24f32d23b579e6b8effde1edf82842c1ec6b311b8115a217caaa1ff24abc
-
SSDEEP
768:rAUJmQCcmLCXQq6fsKiJYsIkjJVzqsVG5kuGKQLddOW/p4WvEITH3i:sUNHFKQbIkHvGMdOq4b
Malware Config
Signatures
-
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\{47554D4C-4e4c-4645-4755-4D4C4E4C4645}\StubPath = "C:\\Windows\\system32\\ahuy.exe" rmass.exe Key created \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{47554D4C-4e4c-4645-4755-4D4C4E4C4645} rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{47554D4C-4e4c-4645-4755-4D4C4E4C4645}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a" rmass.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{47554D4C-4e4c-4645-4755-4D4C4E4C4645}\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 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 1512 rmass.exe 3124 rmass.exe -
description ioc Process 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 Set value (int) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusOverride = "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\ntdbg.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\ahuy.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\rmass.exe rmass.exe File opened for modification C:\Windows\SysWOW64\rmass.exe 52477199561794e3f8e5871c0226cc4d267f039ff66535554d4be1e19796fdd6N.exe File created C:\Windows\SysWOW64\rmass.exe 52477199561794e3f8e5871c0226cc4d267f039ff66535554d4be1e19796fdd6N.exe File created C:\Windows\SysWOW64\ntdbg.exe rmass.exe -
resource yara_rule behavioral2/memory/4020-0-0x0000000000400000-0x0000000000412000-memory.dmp upx behavioral2/files/0x000c000000023b35-5.dat upx behavioral2/memory/4020-7-0x0000000000400000-0x0000000000412000-memory.dmp upx behavioral2/memory/1512-41-0x0000000000400000-0x0000000000412000-memory.dmp upx behavioral2/memory/3124-45-0x0000000000400000-0x0000000000412000-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\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 rmass.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language rmass.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language 52477199561794e3f8e5871c0226cc4d267f039ff66535554d4be1e19796fdd6N.exe -
Suspicious behavior: EnumeratesProcesses 8 IoCs
pid Process 1512 rmass.exe 1512 rmass.exe 1512 rmass.exe 1512 rmass.exe 1512 rmass.exe 1512 rmass.exe 3124 rmass.exe 3124 rmass.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 4020 52477199561794e3f8e5871c0226cc4d267f039ff66535554d4be1e19796fdd6N.exe Token: SeDebugPrivilege 1512 rmass.exe -
Suspicious use of WriteProcessMemory 8 IoCs
description pid Process procid_target PID 4020 wrote to memory of 1512 4020 52477199561794e3f8e5871c0226cc4d267f039ff66535554d4be1e19796fdd6N.exe 85 PID 4020 wrote to memory of 1512 4020 52477199561794e3f8e5871c0226cc4d267f039ff66535554d4be1e19796fdd6N.exe 85 PID 4020 wrote to memory of 1512 4020 52477199561794e3f8e5871c0226cc4d267f039ff66535554d4be1e19796fdd6N.exe 85 PID 1512 wrote to memory of 3124 1512 rmass.exe 86 PID 1512 wrote to memory of 3124 1512 rmass.exe 86 PID 1512 wrote to memory of 3124 1512 rmass.exe 86 PID 1512 wrote to memory of 612 1512 rmass.exe 5 PID 1512 wrote to memory of 3472 1512 rmass.exe 56
Processes
-
C:\Windows\system32\winlogon.exewinlogon.exe1⤵PID:612
-
C:\Windows\Explorer.EXEC:\Windows\Explorer.EXE1⤵PID:3472
-
C:\Users\Admin\AppData\Local\Temp\52477199561794e3f8e5871c0226cc4d267f039ff66535554d4be1e19796fdd6N.exe"C:\Users\Admin\AppData\Local\Temp\52477199561794e3f8e5871c0226cc4d267f039ff66535554d4be1e19796fdd6N.exe"2⤵
- Drops file in System32 directory
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4020 -
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:1512 -
C:\Windows\SysWOW64\rmass.exe--k33p4⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
PID:3124
-
-
-
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
Loading Replay Monitor...
Downloads
-
Filesize
5KB
MD52b2c28a7a01f9584fe220ef84003427f
SHA15fc023df0b5064045eb8de7f2dbe26f07f6fec70
SHA2569e00af53b1d0c0f5270d94a666d95aa7b4dcb9fea49487c210c055c9dcfcc9eb
SHA51239192a8a91dec1abff25af8dac0cf39da4dfd51b3fb4f1ef0b4e776185d4280fbe8387c2ea778da7bbf2ce288b0bce4d23cbe8d9e87bbd250159044f5adbac78
-
Filesize
66KB
MD5002dab514849e6de112fd052244f9866
SHA1ac578ab18b88f8b1fa8f8a7226aeb82500d71449
SHA25629c78f2275910d9c72ec462e2ddab5e6275698a7a51acd3968f25f17569ba10d
SHA512c6afff556f391bc522d1dc47191f68771ae4d7fdf3d03382325aaf282103afb34ea7c9cf501b7e4c0e29cdbd97b1fdae84c43875e6ad4998d914e14c7e75f56e
-
Filesize
67KB
MD5733c0a5fd4258233bb181bace0dcc844
SHA1f69467e0d235d0d7da9cf565fc7dc308fd9bec5c
SHA2564eb646409a601fcf310a6758bf3eb20b723e4bdcb585b3d1e0357d91db893f04
SHA51219b0da38893bad29dbc60facb6fcf98554f2a1b6be6dbf524327b06443ddb44bba1953a17b0ece84136db96bc68b50f2d9044ce5946f191b56cdca7993634347
-
Filesize
64KB
MD558cc7772895672f3c1ad1eb2b089f080
SHA13411881e2c0c92d496a310736aa4c7f6892fcefc
SHA25652477199561794e3f8e5871c0226cc4d267f039ff66535554d4be1e19796fdd6
SHA512508320d35dec15ef7fa906a178d81e74d650e0464dc099d0806030a0d9f6c2e17fac24f32d23b579e6b8effde1edf82842c1ec6b311b8115a217caaa1ff24abc