Analysis
- max time kernel
149s - max time network
101s - platform
windows10-2004_x64 - resource
win10v2004-20240426-en - resource tags
arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system - submitted
03/06/2024, 18:13
Static task
static1
1 signatures
Behavioral task
behavioral1
Sample
03f03e6a9724d4c46c17c085aab0136097a77071a2f9fac9bf6ffa25e2693ae7.exe
Resource
win7-20240221-en
windows7-x64
13 signatures
150 seconds
Behavioral task
behavioral2
Sample
03f03e6a9724d4c46c17c085aab0136097a77071a2f9fac9bf6ffa25e2693ae7.exe
Resource
win10v2004-20240426-en
windows10-2004-x64
12 signatures
150 seconds
General
- Target 03f03e6a9724d4c46c17c085aab0136097a77071a2f9fac9bf6ffa25e2693ae7.exe
- Size 45KB
- Sample240603-wt77baff77
- SHA256 03f03e6a9724d4c46c17c085aab0136097a77071a2f9fac9bf6ffa25e2693ae7
- MD5 1505c8d5dd341121bfa3bda87374e524
- SHA1 7ccf711e556fe4779bff7a0b4f7ed6ae3c14f661
- SHA512 a6f163404556aad361844866fb2b89e53bcf325513a0ff650385cc7da8bd2e22fb9e8dc5776524912f730ca2d4b3d9aacb9371a4766382a0cdb013a27b0ef653
- SSDEEP 768:WAUJmQCcmLCXQq6fsKiJYsIkjJVzqsVG5kuGVAQvKMb7rX:RUNHFKQbIkHvGkAFu77
- MD5 SHA1 SHA512 SSDEEP
Score
10/10
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 - Drops file in Drivers directory 1 IoCs
description ioc Process File opened for modification C:\Windows\system32\drivers\etc\hosts rmass.exe - Modifies Installed Components in the registry 2 TTPs 4 IoCs
description ioc Process Key created \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{52484154-5145-4451-5248-415451454451} rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{52484154-5145-4451-5248-415451454451}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a" rmass.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{52484154-5145-4451-5248-415451454451}\IsInstalled = "1" rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{52484154-5145-4451-5248-415451454451}\StubPath = "C:\\Windows\\system32\\ahuy.exe" rmass.exe - Sets file execution options in registry 2 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 2732 rmass.exe 976 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 - 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 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 rmass.exe File created 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\ntdbg.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\winrnt.exe rmass.exe File opened for modification C:\Windows\SysWOW64\rmass.exe 03f03e6a9724d4c46c17c085aab0136097a77071a2f9fac9bf6ffa25e2693ae7.exe File created C:\Windows\SysWOW64\rmass.exe 03f03e6a9724d4c46c17c085aab0136097a77071a2f9fac9bf6ffa25e2693ae7.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 - Suspicious behavior: EnumeratesProcesses 8 IoCs
pid Process 2732 rmass.exe 2732 rmass.exe 2732 rmass.exe 2732 rmass.exe 2732 rmass.exe 2732 rmass.exe 976 rmass.exe 976 rmass.exe - Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 4396 03f03e6a9724d4c46c17c085aab0136097a77071a2f9fac9bf6ffa25e2693ae7.exe Token: SeDebugPrivilege 2732 rmass.exe - Suspicious use of WriteProcessMemory 8 IoCs
description pid Process procid_target PID 4396 wrote to memory of 2732 4396 03f03e6a9724d4c46c17c085aab0136097a77071a2f9fac9bf6ffa25e2693ae7.exe 84 PID 4396 wrote to memory of 2732 4396 03f03e6a9724d4c46c17c085aab0136097a77071a2f9fac9bf6ffa25e2693ae7.exe 84 PID 4396 wrote to memory of 2732 4396 03f03e6a9724d4c46c17c085aab0136097a77071a2f9fac9bf6ffa25e2693ae7.exe 84 PID 2732 wrote to memory of 976 2732 rmass.exe 85 PID 2732 wrote to memory of 976 2732 rmass.exe 85 PID 2732 wrote to memory of 976 2732 rmass.exe 85 PID 2732 wrote to memory of 616 2732 rmass.exe 5 PID 2732 wrote to memory of 3456 2732 rmass.exe 56
Processes
-
C:\Windows\system32\winlogon.exewinlogon.exe1⤵PID:616
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C:\Windows\Explorer.EXEC:\Windows\Explorer.EXE1⤵PID:3456
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C:\Users\Admin\AppData\Local\Temp\03f03e6a9724d4c46c17c085aab0136097a77071a2f9fac9bf6ffa25e2693ae7.exe"C:\Users\Admin\AppData\Local\Temp\03f03e6a9724d4c46c17c085aab0136097a77071a2f9fac9bf6ffa25e2693ae7.exe"2⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4396 -
C:\Windows\SysWOW64\rmass.exe"C:\Windows\system32\rmass.exe"3⤵
- Windows security bypass
- Drops file in Drivers directory
- Modifies Installed Components in the registry
- Sets file execution options in registry
- Executes dropped EXE
- Windows security modification
- Modifies WinLogon
- Drops file in System32 directory
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2732 -
C:\Windows\SysWOW64\rmass.exe--k33p4⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
PID:976
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
- Path C:\Windows\SysWOW64\RECOVER32.DLL
- Size 5KB
- SHA256 9e00af53b1d0c0f5270d94a666d95aa7b4dcb9fea49487c210c055c9dcfcc9eb
- MD5 2b2c28a7a01f9584fe220ef84003427f
- SHA1 5fc023df0b5064045eb8de7f2dbe26f07f6fec70
- SHA512 39192a8a91dec1abff25af8dac0cf39da4dfd51b3fb4f1ef0b4e776185d4280fbe8387c2ea778da7bbf2ce288b0bce4d23cbe8d9e87bbd250159044f5adbac78
- SSDEEP 48:6CsrGV5e2/WJbm73k2vZcsrkqSq2cxc2G5ZwJOFl:SqV5Roa73kQ/kqqAD
- MD5 SHA1 SHA512 SSDEEP
- Path C:\Windows\SysWOW64\ahuy.exe
- Size 47KB
- SHA256 88bb02a41540bd5ec59ccb124ffbeb751b15eb65d270af1e24ce9def01966209
- MD5 0b6b842bac0cb59f4fb271eeaa7428a2
- SHA1 177d1e324b78f93d035656fce470eba0fa598012
- SHA512 9510c6d65c380eacc83659acdbf972e3a602f71e507334fb6b390a0160863844179e0a7a22d05f83368a1622022eb286699a7221a36d4aec6196e792b54821c7
- SSDEEP 768:jIUNRxfgI+zseNUkyb/aeGVITlgElC1f4B5X5YB:jfRxfv+gAUVbbaxJ
- MD5 SHA1 SHA512 SSDEEP
- Path C:\Windows\SysWOW64\ntdbg.exe
- Size 48KB
- SHA256 585ef01fbd1fbe1b5967f9f812c9d1f56c56ef7994e4ca5417b47954c2823da3
- MD5 1c745cc9ba2334c95f7f20bab4fd491a
- SHA1 857c011cdda78863ee3b8fb27ac8d216c16f409c
- SHA512 fb77035efef8cb9e4174ac9e00c753afa453ff2025c025c69b1911ee3c3579dcebf67809ade9285d1b2e1051517d9ab5d0526bf47c2f300f0e76ca6a8b564ef8
- SSDEEP 768:ErzlSkSFrsbhDWgT/mzqvyFecNUElIqYtUVjCIbQ+:EgVFyNWaBPyUsIQVjdb1
- MD5 SHA1 SHA512 SSDEEP
- Path C:\Windows\SysWOW64\rmass.exe
- Size 45KB
- SHA256 03f03e6a9724d4c46c17c085aab0136097a77071a2f9fac9bf6ffa25e2693ae7
- MD5 1505c8d5dd341121bfa3bda87374e524
- SHA1 7ccf711e556fe4779bff7a0b4f7ed6ae3c14f661
- SHA512 a6f163404556aad361844866fb2b89e53bcf325513a0ff650385cc7da8bd2e22fb9e8dc5776524912f730ca2d4b3d9aacb9371a4766382a0cdb013a27b0ef653
- SSDEEP 768:WAUJmQCcmLCXQq6fsKiJYsIkjJVzqsVG5kuGVAQvKMb7rX:RUNHFKQbIkHvGkAFu77
- MD5 SHA1 SHA512 SSDEEP
- Path C:\Windows\System32\drivers\etc\hosts
- Size 1KB
- SHA256 15c7218eb9cef5fa0573db657b15ce3a5f0e0609f1166df8098ca7152df505b4
- MD5 6f47b62de25d1745e296a06b3f98ed19
- SHA1 a688bb35a4c8a5cc198985d624a1b5a6ac5b9f6f
- SHA512 dea26fff8060f44bf20fe4fff2ecbacf428727f10c0f5886fb4813e28fce9cbc3d088337c84edd9857b18514c83f1bb1cf0f51518aaecef09f30e921f4d758d7
- MD5 SHA1 SHA512