Analysis
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max time kernel
150s -
max time network
127s -
platform
windows7_x64 -
resource
win7-20231023-en -
resource tags
arch:x64arch:x86image:win7-20231023-enlocale:en-usos:windows7-x64system -
submitted
17/11/2023, 17:44
Behavioral task
behavioral1
Sample
NEAS.21bea3cbf86d29540f5ad0e2cbe644f3.exe
Resource
win7-20231023-en
Behavioral task
behavioral2
Sample
NEAS.21bea3cbf86d29540f5ad0e2cbe644f3.exe
Resource
win10v2004-20231020-en
General
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Target
NEAS.21bea3cbf86d29540f5ad0e2cbe644f3.exe
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Size
19KB
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MD5
21bea3cbf86d29540f5ad0e2cbe644f3
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SHA1
6eb18ceee7b8420dd4a0151ced950a740dbbb325
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SHA256
9b8b745b7de3cd754e9d7a86217429c21d1f178c736bdffab29b0b7a989b3e35
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SHA512
6bb51c9cc0d0ff621f18f7e6800935b315f1eeda84c987bb279f6377b6879b5f0e2f8775b0719549093e06cd4a98551599aecf00ac741c12fd0f8db21159ce7b
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SSDEEP
384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvXaB7fp:rRkiLw3HsDSARGG/2bp
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\{41484C42-5259-4a4f-4148-4C4252594a4f} rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{41484C42-5259-4a4f-4148-4C4252594a4f}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a" rmass.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{41484C42-5259-4a4f-4148-4C4252594a4f}\IsInstalled = "1" rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{41484C42-5259-4a4f-4148-4C4252594a4f}\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 1420 rmass.exe 2200 rmass.exe -
Loads dropped DLL 3 IoCs
pid Process 1964 NEAS.21bea3cbf86d29540f5ad0e2cbe644f3.exe 1964 NEAS.21bea3cbf86d29540f5ad0e2cbe644f3.exe 1420 rmass.exe -
resource yara_rule behavioral1/memory/1964-0-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral1/memory/2200-25-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral1/files/0x00080000000120ca-24.dat upx behavioral1/files/0x00080000000120ca-23.dat upx behavioral1/memory/1420-22-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral1/files/0x00080000000120ca-13.dat upx behavioral1/files/0x00080000000120ca-12.dat upx behavioral1/memory/1964-11-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral1/files/0x00080000000120ca-8.dat upx behavioral1/memory/1964-7-0x00000000002C0000-0x00000000002D1000-memory.dmp upx behavioral1/files/0x00080000000120ca-6.dat upx behavioral1/files/0x00080000000120ca-4.dat upx behavioral1/memory/1420-60-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral1/memory/2200-61-0x0000000000400000-0x0000000000411000-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 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 Key created \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\{BC84DF00-BC38-9902-8082-6FCBF2D87A0B} rmass.exe -
Drops file in System32 directory 12 IoCs
description ioc Process File opened for modification C:\Windows\SysWOW64\idbg32.exe rmass.exe File created C:\Windows\SysWOW64\rmass.exe NEAS.21bea3cbf86d29540f5ad0e2cbe644f3.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\rmass.exe rmass.exe File opened for modification C:\Windows\SysWOW64\rmass.exe NEAS.21bea3cbf86d29540f5ad0e2cbe644f3.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 -
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 1420 rmass.exe 1420 rmass.exe 1420 rmass.exe 2200 rmass.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 1964 NEAS.21bea3cbf86d29540f5ad0e2cbe644f3.exe Token: SeDebugPrivilege 1420 rmass.exe -
Suspicious use of WriteProcessMemory 10 IoCs
description pid Process procid_target PID 1964 wrote to memory of 1420 1964 NEAS.21bea3cbf86d29540f5ad0e2cbe644f3.exe 28 PID 1964 wrote to memory of 1420 1964 NEAS.21bea3cbf86d29540f5ad0e2cbe644f3.exe 28 PID 1964 wrote to memory of 1420 1964 NEAS.21bea3cbf86d29540f5ad0e2cbe644f3.exe 28 PID 1964 wrote to memory of 1420 1964 NEAS.21bea3cbf86d29540f5ad0e2cbe644f3.exe 28 PID 1420 wrote to memory of 424 1420 rmass.exe 22 PID 1420 wrote to memory of 1212 1420 rmass.exe 8 PID 1420 wrote to memory of 2200 1420 rmass.exe 29 PID 1420 wrote to memory of 2200 1420 rmass.exe 29 PID 1420 wrote to memory of 2200 1420 rmass.exe 29 PID 1420 wrote to memory of 2200 1420 rmass.exe 29
Processes
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C:\Windows\Explorer.EXEC:\Windows\Explorer.EXE1⤵PID:1212
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C:\Users\Admin\AppData\Local\Temp\NEAS.21bea3cbf86d29540f5ad0e2cbe644f3.exe"C:\Users\Admin\AppData\Local\Temp\NEAS.21bea3cbf86d29540f5ad0e2cbe644f3.exe"2⤵
- Loads dropped DLL
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1964 -
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:1420 -
C:\Windows\SysWOW64\rmass.exe--k33p4⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
PID:2200
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C:\Windows\system32\winlogon.exewinlogon.exe1⤵PID:424
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
MD5b927e0d7ddf33d700b30a0df417ff3cf
SHA19429cc716268dc19ec6d1fc21484e6352934e2c7
SHA256ee5b9ee5cdb466d307a4e3865f6eb8de976b36d8a4042fc04180d866471b4e33
SHA51237096a5cd9de199bab6d66e37afcb6b4c88eee93519a19b727315f7417bef8e734665929f2651d7e126d5edda8fe2413ccd53e089286537a76d9440654637926
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Filesize
22KB
MD5ed9a855a0b2e24d317137d5b2cc14cb2
SHA19f828d5111a593fd9e854add2feecaf7001249dc
SHA25660953234ca387dcd8cacca8c29fb516514dfd7ea4343e464ddcaecd62c803491
SHA512d32904630bc190f6da97c3bcfd815b261273ad83a30ccb086edeaf59f926215997fef7c4b3ccb0904487c1c151bff5e5488b211e882db76b7070b82f664cac72
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Filesize
19KB
MD521bea3cbf86d29540f5ad0e2cbe644f3
SHA16eb18ceee7b8420dd4a0151ced950a740dbbb325
SHA2569b8b745b7de3cd754e9d7a86217429c21d1f178c736bdffab29b0b7a989b3e35
SHA5126bb51c9cc0d0ff621f18f7e6800935b315f1eeda84c987bb279f6377b6879b5f0e2f8775b0719549093e06cd4a98551599aecf00ac741c12fd0f8db21159ce7b
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Filesize
19KB
MD521bea3cbf86d29540f5ad0e2cbe644f3
SHA16eb18ceee7b8420dd4a0151ced950a740dbbb325
SHA2569b8b745b7de3cd754e9d7a86217429c21d1f178c736bdffab29b0b7a989b3e35
SHA5126bb51c9cc0d0ff621f18f7e6800935b315f1eeda84c987bb279f6377b6879b5f0e2f8775b0719549093e06cd4a98551599aecf00ac741c12fd0f8db21159ce7b
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Filesize
19KB
MD521bea3cbf86d29540f5ad0e2cbe644f3
SHA16eb18ceee7b8420dd4a0151ced950a740dbbb325
SHA2569b8b745b7de3cd754e9d7a86217429c21d1f178c736bdffab29b0b7a989b3e35
SHA5126bb51c9cc0d0ff621f18f7e6800935b315f1eeda84c987bb279f6377b6879b5f0e2f8775b0719549093e06cd4a98551599aecf00ac741c12fd0f8db21159ce7b
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Filesize
19KB
MD521bea3cbf86d29540f5ad0e2cbe644f3
SHA16eb18ceee7b8420dd4a0151ced950a740dbbb325
SHA2569b8b745b7de3cd754e9d7a86217429c21d1f178c736bdffab29b0b7a989b3e35
SHA5126bb51c9cc0d0ff621f18f7e6800935b315f1eeda84c987bb279f6377b6879b5f0e2f8775b0719549093e06cd4a98551599aecf00ac741c12fd0f8db21159ce7b
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Filesize
1KB
MD5b10b13206b0f2cf3968050072f6979bf
SHA1699db21ba9cecf3f13ac3d76e22cfa41aa94da80
SHA2560eef3217095cb97b695c434e74d6314bf9e869a013d6e9c88e58c34576a276b4
SHA512d33bfd931be6676539507a69101d99fa4c5ef36b12422bd11f063b9b6a47b7444f6c4ad5f35e044714fdb872e96cd9fddf049e8329af1219483887f6ac5f4a5d
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Filesize
19KB
MD521bea3cbf86d29540f5ad0e2cbe644f3
SHA16eb18ceee7b8420dd4a0151ced950a740dbbb325
SHA2569b8b745b7de3cd754e9d7a86217429c21d1f178c736bdffab29b0b7a989b3e35
SHA5126bb51c9cc0d0ff621f18f7e6800935b315f1eeda84c987bb279f6377b6879b5f0e2f8775b0719549093e06cd4a98551599aecf00ac741c12fd0f8db21159ce7b
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Filesize
19KB
MD521bea3cbf86d29540f5ad0e2cbe644f3
SHA16eb18ceee7b8420dd4a0151ced950a740dbbb325
SHA2569b8b745b7de3cd754e9d7a86217429c21d1f178c736bdffab29b0b7a989b3e35
SHA5126bb51c9cc0d0ff621f18f7e6800935b315f1eeda84c987bb279f6377b6879b5f0e2f8775b0719549093e06cd4a98551599aecf00ac741c12fd0f8db21159ce7b
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Filesize
19KB
MD521bea3cbf86d29540f5ad0e2cbe644f3
SHA16eb18ceee7b8420dd4a0151ced950a740dbbb325
SHA2569b8b745b7de3cd754e9d7a86217429c21d1f178c736bdffab29b0b7a989b3e35
SHA5126bb51c9cc0d0ff621f18f7e6800935b315f1eeda84c987bb279f6377b6879b5f0e2f8775b0719549093e06cd4a98551599aecf00ac741c12fd0f8db21159ce7b