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Analysis
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max time kernel
149s -
max time network
144s -
platform
windows7_x64 -
resource
win7-20230831-en -
resource tags
arch:x64arch:x86image:win7-20230831-enlocale:en-usos:windows7-x64system -
submitted
05/10/2023, 18:49
Behavioral task
behavioral1
Sample
811581243c03c2d6a98d0b24bfec9e31_JC.exe
Resource
win7-20230831-en
Behavioral task
behavioral2
Sample
811581243c03c2d6a98d0b24bfec9e31_JC.exe
Resource
win10v2004-20230915-en
General
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Target
811581243c03c2d6a98d0b24bfec9e31_JC.exe
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Size
19KB
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MD5
811581243c03c2d6a98d0b24bfec9e31
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SHA1
77cf93cd3f857f59c22c6d6f13770e33672f7777
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SHA256
5457179ec6ed6bce1c5c11ed274409b2802fa3d7b220569301d47bee3971b405
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SHA512
93b70881b103fa8af9edb24054b4e6b658443202fb74ee162d8fb239c08a3eeaf1d973f49d03569ac21dcc9cbd426d5a4b379c556d8d84337799f828a3608b4f
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SSDEEP
384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvXfy:rRkiLw3HsDSARGG/q
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\{4E475451-4752-4d4c-4E47-545147524d4c} rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4E475451-4752-4d4c-4E47-545147524d4c}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a" rmass.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4E475451-4752-4d4c-4E47-545147524d4c}\IsInstalled = "1" rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4E475451-4752-4d4c-4E47-545147524d4c}\StubPath = "C:\\Windows\\system32\\ahuy.exe" rmass.exe -
Sets file execution options in registry 2 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 2912 rmass.exe 2780 rmass.exe -
Loads dropped DLL 3 IoCs
pid Process 2252 811581243c03c2d6a98d0b24bfec9e31_JC.exe 2252 811581243c03c2d6a98d0b24bfec9e31_JC.exe 2912 rmass.exe -
resource yara_rule behavioral1/memory/2252-0-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral1/files/0x00070000000120bd-4.dat upx behavioral1/files/0x00070000000120bd-13.dat upx behavioral1/files/0x00070000000120bd-12.dat upx behavioral1/files/0x00070000000120bd-22.dat upx behavioral1/memory/2252-10-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral1/files/0x00070000000120bd-7.dat upx behavioral1/files/0x00070000000120bd-6.dat upx behavioral1/files/0x00070000000120bd-23.dat upx behavioral1/memory/2780-24-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral1/memory/2912-25-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral1/memory/2912-57-0x0000000000400000-0x0000000000411000-memory.dmp upx -
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 -
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\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 opened for modification 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 created 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\rmass.exe 811581243c03c2d6a98d0b24bfec9e31_JC.exe File created C:\Windows\SysWOW64\rmass.exe 811581243c03c2d6a98d0b24bfec9e31_JC.exe File created C:\Windows\SysWOW64\ntdbg.exe rmass.exe File opened for modification C:\Windows\SysWOW64\RECOVER32.DLL 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 -
Suspicious behavior: EnumeratesProcesses 4 IoCs
pid Process 2912 rmass.exe 2912 rmass.exe 2912 rmass.exe 2780 rmass.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 2252 811581243c03c2d6a98d0b24bfec9e31_JC.exe Token: SeDebugPrivilege 2912 rmass.exe -
Suspicious use of WriteProcessMemory 10 IoCs
description pid Process procid_target PID 2252 wrote to memory of 2912 2252 811581243c03c2d6a98d0b24bfec9e31_JC.exe 28 PID 2252 wrote to memory of 2912 2252 811581243c03c2d6a98d0b24bfec9e31_JC.exe 28 PID 2252 wrote to memory of 2912 2252 811581243c03c2d6a98d0b24bfec9e31_JC.exe 28 PID 2252 wrote to memory of 2912 2252 811581243c03c2d6a98d0b24bfec9e31_JC.exe 28 PID 2912 wrote to memory of 420 2912 rmass.exe 4 PID 2912 wrote to memory of 1216 2912 rmass.exe 16 PID 2912 wrote to memory of 2780 2912 rmass.exe 29 PID 2912 wrote to memory of 2780 2912 rmass.exe 29 PID 2912 wrote to memory of 2780 2912 rmass.exe 29 PID 2912 wrote to memory of 2780 2912 rmass.exe 29
Processes
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C:\Windows\system32\winlogon.exewinlogon.exe1⤵PID:420
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C:\Windows\Explorer.EXEC:\Windows\Explorer.EXE1⤵PID:1216
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C:\Users\Admin\AppData\Local\Temp\811581243c03c2d6a98d0b24bfec9e31_JC.exe"C:\Users\Admin\AppData\Local\Temp\811581243c03c2d6a98d0b24bfec9e31_JC.exe"2⤵
- Loads dropped DLL
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2252 -
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:2912 -
C:\Windows\SysWOW64\rmass.exe--k33p4⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
PID:2780
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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
21KB
MD50716bd9f3e1d9549693aad7d8251f1b0
SHA1266d346ab79af8b3d87004431dc78d72869b38d9
SHA256ce40d8757566e0295e2a660c7b8afb054743b3419c9f0bd3e848e63f95ef866b
SHA51242677c9162b2ad5b52ea98f9e39f725d1c7192996b6f67eaf727481fa40b749d0c7ae80529ead9b14f53fb15d832a91e33a81b826a60f3d4c856ce915cc7af65
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Filesize
22KB
MD5034f41df90c521525d69cd82e2bc6ce5
SHA14201c4274f9b73a9d84d2130f6a0ab2f075cb9f8
SHA256825055de35a124c366b8b9c6d1b26ce17f9cd3c0b57c9edd5f29dbd903359ae0
SHA512f56a26ca02cc067850068765426cac91d48aa359a57657da4a2a67c56b6acf639d6fa9d34889acc03d930661c9a87a821f8b58ac150d1b529d50d3f2c4c527cc
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Filesize
19KB
MD5811581243c03c2d6a98d0b24bfec9e31
SHA177cf93cd3f857f59c22c6d6f13770e33672f7777
SHA2565457179ec6ed6bce1c5c11ed274409b2802fa3d7b220569301d47bee3971b405
SHA51293b70881b103fa8af9edb24054b4e6b658443202fb74ee162d8fb239c08a3eeaf1d973f49d03569ac21dcc9cbd426d5a4b379c556d8d84337799f828a3608b4f
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Filesize
19KB
MD5811581243c03c2d6a98d0b24bfec9e31
SHA177cf93cd3f857f59c22c6d6f13770e33672f7777
SHA2565457179ec6ed6bce1c5c11ed274409b2802fa3d7b220569301d47bee3971b405
SHA51293b70881b103fa8af9edb24054b4e6b658443202fb74ee162d8fb239c08a3eeaf1d973f49d03569ac21dcc9cbd426d5a4b379c556d8d84337799f828a3608b4f
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Filesize
19KB
MD5811581243c03c2d6a98d0b24bfec9e31
SHA177cf93cd3f857f59c22c6d6f13770e33672f7777
SHA2565457179ec6ed6bce1c5c11ed274409b2802fa3d7b220569301d47bee3971b405
SHA51293b70881b103fa8af9edb24054b4e6b658443202fb74ee162d8fb239c08a3eeaf1d973f49d03569ac21dcc9cbd426d5a4b379c556d8d84337799f828a3608b4f
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Filesize
19KB
MD5811581243c03c2d6a98d0b24bfec9e31
SHA177cf93cd3f857f59c22c6d6f13770e33672f7777
SHA2565457179ec6ed6bce1c5c11ed274409b2802fa3d7b220569301d47bee3971b405
SHA51293b70881b103fa8af9edb24054b4e6b658443202fb74ee162d8fb239c08a3eeaf1d973f49d03569ac21dcc9cbd426d5a4b379c556d8d84337799f828a3608b4f
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Filesize
1KB
MD5b10b13206b0f2cf3968050072f6979bf
SHA1699db21ba9cecf3f13ac3d76e22cfa41aa94da80
SHA2560eef3217095cb97b695c434e74d6314bf9e869a013d6e9c88e58c34576a276b4
SHA512d33bfd931be6676539507a69101d99fa4c5ef36b12422bd11f063b9b6a47b7444f6c4ad5f35e044714fdb872e96cd9fddf049e8329af1219483887f6ac5f4a5d
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Filesize
19KB
MD5811581243c03c2d6a98d0b24bfec9e31
SHA177cf93cd3f857f59c22c6d6f13770e33672f7777
SHA2565457179ec6ed6bce1c5c11ed274409b2802fa3d7b220569301d47bee3971b405
SHA51293b70881b103fa8af9edb24054b4e6b658443202fb74ee162d8fb239c08a3eeaf1d973f49d03569ac21dcc9cbd426d5a4b379c556d8d84337799f828a3608b4f
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Filesize
19KB
MD5811581243c03c2d6a98d0b24bfec9e31
SHA177cf93cd3f857f59c22c6d6f13770e33672f7777
SHA2565457179ec6ed6bce1c5c11ed274409b2802fa3d7b220569301d47bee3971b405
SHA51293b70881b103fa8af9edb24054b4e6b658443202fb74ee162d8fb239c08a3eeaf1d973f49d03569ac21dcc9cbd426d5a4b379c556d8d84337799f828a3608b4f
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Filesize
19KB
MD5811581243c03c2d6a98d0b24bfec9e31
SHA177cf93cd3f857f59c22c6d6f13770e33672f7777
SHA2565457179ec6ed6bce1c5c11ed274409b2802fa3d7b220569301d47bee3971b405
SHA51293b70881b103fa8af9edb24054b4e6b658443202fb74ee162d8fb239c08a3eeaf1d973f49d03569ac21dcc9cbd426d5a4b379c556d8d84337799f828a3608b4f