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Analysis
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max time kernel
150s -
max time network
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platform
windows7_x64 -
resource
win7-20240221-en -
resource tags
arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system -
submitted
08/05/2024, 14:37
Behavioral task
behavioral1
Sample
dcec5319d1ed548b7523cda83292aad0_NEIKI.exe
Resource
win7-20240221-en
Behavioral task
behavioral2
Sample
dcec5319d1ed548b7523cda83292aad0_NEIKI.exe
Resource
win10v2004-20240419-en
General
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Target
dcec5319d1ed548b7523cda83292aad0_NEIKI.exe
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Size
22KB
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MD5
dcec5319d1ed548b7523cda83292aad0
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SHA1
d352a94f3510a1bee94d0657ae951cf498bee616
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SHA256
a945ee255ac7bc5751c05c4913b69c1f0397f176fe502c223f27b9d1ba2a5c37
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SHA512
28019f287be93831b71c7b58c0fa1f546a91a5aa7eed2b570eca49ed82b8a985b7cd59f029ea64cb08e7f777742585b9cf229fbffcd455e4ca88810b1c42f62a
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SSDEEP
384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvX8Mb7a6Mr0:rRkiLw3HsDSARGG/MMb7rH
Malware Config
Signatures
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description ioc Process 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 Set value (int) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\AntiVirusDisableNotify = "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 Set value (int) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4B584950-5043-4b46-4B58-495050434b46}\IsInstalled = "1" rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4B584950-5043-4b46-4B58-495050434b46}\StubPath = "C:\\Windows\\system32\\ahuy.exe" rmass.exe Key created \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4B584950-5043-4b46-4B58-495050434b46} rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4B584950-5043-4b46-4B58-495050434b46}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a" 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 2596 rmass.exe 2536 rmass.exe -
Loads dropped DLL 3 IoCs
pid Process 2244 dcec5319d1ed548b7523cda83292aad0_NEIKI.exe 2244 dcec5319d1ed548b7523cda83292aad0_NEIKI.exe 2596 rmass.exe -
resource yara_rule behavioral1/memory/2244-0-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral1/files/0x000c00000001445e-4.dat upx behavioral1/memory/2244-5-0x0000000000320000-0x0000000000331000-memory.dmp upx behavioral1/memory/2244-12-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral1/memory/2596-18-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral1/memory/2596-60-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral1/memory/2536-61-0x0000000000400000-0x0000000000411000-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 created C:\Windows\SysWOW64\rmass.exe dcec5319d1ed548b7523cda83292aad0_NEIKI.exe File opened for modification 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\winrnt.exe rmass.exe File opened for modification C:\Windows\SysWOW64\idbg32.exe rmass.exe File opened for modification C:\Windows\SysWOW64\rmass.exe dcec5319d1ed548b7523cda83292aad0_NEIKI.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 created C:\Windows\SysWOW64\ahuy.exe rmass.exe File created C:\Windows\SysWOW64\RECOVER32.DLL rmass.exe File opened for modification C:\Windows\SysWOW64\rmass.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 2596 rmass.exe 2596 rmass.exe 2596 rmass.exe 2536 rmass.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 2244 dcec5319d1ed548b7523cda83292aad0_NEIKI.exe Token: SeDebugPrivilege 2596 rmass.exe -
Suspicious use of WriteProcessMemory 10 IoCs
description pid Process procid_target PID 2244 wrote to memory of 2596 2244 dcec5319d1ed548b7523cda83292aad0_NEIKI.exe 28 PID 2244 wrote to memory of 2596 2244 dcec5319d1ed548b7523cda83292aad0_NEIKI.exe 28 PID 2244 wrote to memory of 2596 2244 dcec5319d1ed548b7523cda83292aad0_NEIKI.exe 28 PID 2244 wrote to memory of 2596 2244 dcec5319d1ed548b7523cda83292aad0_NEIKI.exe 28 PID 2596 wrote to memory of 2536 2596 rmass.exe 29 PID 2596 wrote to memory of 2536 2596 rmass.exe 29 PID 2596 wrote to memory of 2536 2596 rmass.exe 29 PID 2596 wrote to memory of 2536 2596 rmass.exe 29 PID 2596 wrote to memory of 428 2596 rmass.exe 5 PID 2596 wrote to memory of 1192 2596 rmass.exe 21
Processes
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C:\Windows\system32\winlogon.exewinlogon.exe1⤵PID:428
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C:\Windows\Explorer.EXEC:\Windows\Explorer.EXE1⤵PID:1192
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C:\Users\Admin\AppData\Local\Temp\dcec5319d1ed548b7523cda83292aad0_NEIKI.exe"C:\Users\Admin\AppData\Local\Temp\dcec5319d1ed548b7523cda83292aad0_NEIKI.exe"2⤵
- Loads dropped DLL
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2244 -
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:2596 -
C:\Windows\SysWOW64\rmass.exe--k33p4⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
PID:2536
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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
MD5f74e63afa96baa9a09bcf23913280ca2
SHA14bf7f4456af85b5a4a36cd56f8d4313c96967d4b
SHA256460359caaeb6c7ce4b0bc87405d6c2b4b8f2e2a2d859add415186eba7b25dbba
SHA5129ff6ea0578d770ce0412fa4fafa285f7882fd200a710353165491011e6cdcd1c863d90385094dd834821224f699ab2c5076a6df69af04ab7cfdad954d83fb2c5
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Filesize
25KB
MD58e75ada8feea226e7cf90aa8155eb40d
SHA147e91370b794b36f47474d3a14cbcb3403c080a7
SHA25685e7b9dca8b3fdf32bbc93020a2fd4bf25532f565b01c99603a7308282ed79b7
SHA512a4e84c9c99b323bc433c7f0b0ec69feff8e9dfd28af29fe2d78b213c272d3679dd1835de35f81ab7981018d69a9733cc31f0212c719380da7a25dc817b2ac57c
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Filesize
1KB
MD5b10b13206b0f2cf3968050072f6979bf
SHA1699db21ba9cecf3f13ac3d76e22cfa41aa94da80
SHA2560eef3217095cb97b695c434e74d6314bf9e869a013d6e9c88e58c34576a276b4
SHA512d33bfd931be6676539507a69101d99fa4c5ef36b12422bd11f063b9b6a47b7444f6c4ad5f35e044714fdb872e96cd9fddf049e8329af1219483887f6ac5f4a5d
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Filesize
22KB
MD5dcec5319d1ed548b7523cda83292aad0
SHA1d352a94f3510a1bee94d0657ae951cf498bee616
SHA256a945ee255ac7bc5751c05c4913b69c1f0397f176fe502c223f27b9d1ba2a5c37
SHA51228019f287be93831b71c7b58c0fa1f546a91a5aa7eed2b570eca49ed82b8a985b7cd59f029ea64cb08e7f777742585b9cf229fbffcd455e4ca88810b1c42f62a