Analysis
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max time kernel
149s -
max time network
119s -
platform
windows7_x64 -
resource
win7-20231129-en -
resource tags
arch:x64arch:x86image:win7-20231129-enlocale:en-usos:windows7-x64system -
submitted
17/05/2024, 14:43
Behavioral task
behavioral1
Sample
c64f57f9b44d5aa023d7467c15d9218e.exe
Resource
win7-20231129-en
Behavioral task
behavioral2
Sample
c64f57f9b44d5aa023d7467c15d9218e.exe
Resource
win10v2004-20240508-en
General
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Target
c64f57f9b44d5aa023d7467c15d9218e.exe
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Size
22KB
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MD5
c64f57f9b44d5aa023d7467c15d9218e
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SHA1
d7e5749bc0f9df75c7e5f1ffad1eea6908a81b00
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SHA256
9e932649b42f6518a53d98e503bb409e3a13bf3ba417869c901913094e20f767
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SHA512
36cbf8873faf73eede168c9a4146479ca7710f03b4b7a00a1cd57cc8fb04b229ce16cc2bb930939c47556c0f109c0f5890a090a31588f5d6bf52ec6efd770506
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SSDEEP
384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvX8Mb7a6M0:rRkiLw3HsDSARGG/MMb7rH
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 -
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\{53434647-4252-4254-5343-464742524254} rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{53434647-4252-4254-5343-464742524254}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a" rmass.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{53434647-4252-4254-5343-464742524254}\IsInstalled = "1" rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{53434647-4252-4254-5343-464742524254}\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 2740 rmass.exe 3024 rmass.exe -
Loads dropped DLL 3 IoCs
pid Process 2368 c64f57f9b44d5aa023d7467c15d9218e.exe 2368 c64f57f9b44d5aa023d7467c15d9218e.exe 2740 rmass.exe -
resource yara_rule behavioral1/memory/2368-0-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral1/files/0x000b000000014b31-4.dat upx behavioral1/memory/2740-15-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral1/memory/2368-12-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral1/memory/2368-5-0x0000000000320000-0x0000000000331000-memory.dmp upx behavioral1/memory/3024-27-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral1/memory/2740-61-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral1/memory/3024-62-0x0000000000400000-0x0000000000411000-memory.dmp upx -
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 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\RECOVER32.DLL rmass.exe File opened for modification C:\Windows\SysWOW64\winrnt.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 opened for modification C:\Windows\SysWOW64\rmass.exe c64f57f9b44d5aa023d7467c15d9218e.exe File created C:\Windows\SysWOW64\rmass.exe c64f57f9b44d5aa023d7467c15d9218e.exe File opened for modification C:\Windows\SysWOW64\ahuy.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\aset32.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\aset32.exe rmass.exe 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 -
Suspicious behavior: EnumeratesProcesses 4 IoCs
pid Process 2740 rmass.exe 2740 rmass.exe 2740 rmass.exe 3024 rmass.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 2368 c64f57f9b44d5aa023d7467c15d9218e.exe Token: SeDebugPrivilege 2740 rmass.exe -
Suspicious use of WriteProcessMemory 10 IoCs
description pid Process procid_target PID 2368 wrote to memory of 2740 2368 c64f57f9b44d5aa023d7467c15d9218e.exe 28 PID 2368 wrote to memory of 2740 2368 c64f57f9b44d5aa023d7467c15d9218e.exe 28 PID 2368 wrote to memory of 2740 2368 c64f57f9b44d5aa023d7467c15d9218e.exe 28 PID 2368 wrote to memory of 2740 2368 c64f57f9b44d5aa023d7467c15d9218e.exe 28 PID 2740 wrote to memory of 436 2740 rmass.exe 5 PID 2740 wrote to memory of 1376 2740 rmass.exe 21 PID 2740 wrote to memory of 3024 2740 rmass.exe 29 PID 2740 wrote to memory of 3024 2740 rmass.exe 29 PID 2740 wrote to memory of 3024 2740 rmass.exe 29 PID 2740 wrote to memory of 3024 2740 rmass.exe 29
Processes
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C:\Windows\system32\winlogon.exewinlogon.exe1⤵PID:436
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C:\Windows\Explorer.EXEC:\Windows\Explorer.EXE1⤵PID:1376
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C:\Users\Admin\AppData\Local\Temp\c64f57f9b44d5aa023d7467c15d9218e.exe"C:\Users\Admin\AppData\Local\Temp\c64f57f9b44d5aa023d7467c15d9218e.exe"2⤵
- Loads dropped DLL
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2368 -
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
- Loads dropped DLL
- 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:2740 -
C:\Windows\SysWOW64\rmass.exe--k33p4⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
PID:3024
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
5KB
MD52b2c28a7a01f9584fe220ef84003427f
SHA15fc023df0b5064045eb8de7f2dbe26f07f6fec70
SHA2569e00af53b1d0c0f5270d94a666d95aa7b4dcb9fea49487c210c055c9dcfcc9eb
SHA51239192a8a91dec1abff25af8dac0cf39da4dfd51b3fb4f1ef0b4e776185d4280fbe8387c2ea778da7bbf2ce288b0bce4d23cbe8d9e87bbd250159044f5adbac78
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Filesize
24KB
MD52ac11693baec477ffcaba6a6850ab289
SHA1ad7bac386d4f8d514ddfa8543379f9d669daa0f0
SHA25665e37ed9e515f4bf27d5636d353a65f708326c7d346085e1860c978642a26bfd
SHA5126eb116ced41962f584ae3ceae0a7bd1b2b95bf05f948f3cb4d193595f5e97129fdfb6c1bebc9071f96c9be68d0ef21a0248aaeac10c6cf2a0369b36c2d07e014
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Filesize
25KB
MD55da2b8f1294e82fe03d8a95bc53d5275
SHA13b663dcbe19c5422cc2636db7a115dfc5204a635
SHA2566de1a4f765bac7493b4c54167b1c1ff70e0ff04f4d01626352a218bf2cef69e6
SHA512204d2ffdbb83cb539d80f2a9437763b1cf230e070e69537c35ac7df4888cd0963572ff4f95303acae7add9529b1507006c4b240d60b76bc8114be60a65676e93
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Filesize
1KB
MD5b10b13206b0f2cf3968050072f6979bf
SHA1699db21ba9cecf3f13ac3d76e22cfa41aa94da80
SHA2560eef3217095cb97b695c434e74d6314bf9e869a013d6e9c88e58c34576a276b4
SHA512d33bfd931be6676539507a69101d99fa4c5ef36b12422bd11f063b9b6a47b7444f6c4ad5f35e044714fdb872e96cd9fddf049e8329af1219483887f6ac5f4a5d
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Filesize
22KB
MD5c64f57f9b44d5aa023d7467c15d9218e
SHA1d7e5749bc0f9df75c7e5f1ffad1eea6908a81b00
SHA2569e932649b42f6518a53d98e503bb409e3a13bf3ba417869c901913094e20f767
SHA51236cbf8873faf73eede168c9a4146479ca7710f03b4b7a00a1cd57cc8fb04b229ce16cc2bb930939c47556c0f109c0f5890a090a31588f5d6bf52ec6efd770506