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Analysis
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max time kernel
149s -
max time network
140s -
platform
windows7_x64 -
resource
win7-20231129-en -
resource tags
arch:x64arch:x86image:win7-20231129-enlocale:en-usos:windows7-x64system -
submitted
08/05/2024, 15:45
Behavioral task
behavioral1
Sample
f537775e473e7ef09eaffb24889df490_NEIKI.exe
Resource
win7-20231129-en
Behavioral task
behavioral2
Sample
f537775e473e7ef09eaffb24889df490_NEIKI.exe
Resource
win10v2004-20240508-en
General
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Target
f537775e473e7ef09eaffb24889df490_NEIKI.exe
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Size
21KB
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MD5
f537775e473e7ef09eaffb24889df490
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SHA1
b41031414c7ba6dc3b0f57ee7b84cc9942d06edb
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SHA256
4672e5a178fc023be578c92ff551ff106837336c596824d3c46f2f48d6e6f798
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SHA512
49a73992cd501c05b303bf9ff5ade07745c666703f961816ae9238b30e7ed4b51ad1be8d46f932fd9a351be170ce6dcd4a43e5355a29b3824dcae7a777186a70
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SSDEEP
384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvX8Mb7a6khL:rRkiLw3HsDSARGG/MMb7rO
Malware Config
Signatures
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description ioc Process 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 Set value (int) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\FirewallDisableNotify = "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 2000 rmass.exe 2400 rmass.exe -
Loads dropped DLL 3 IoCs
pid Process 2004 f537775e473e7ef09eaffb24889df490_NEIKI.exe 2004 f537775e473e7ef09eaffb24889df490_NEIKI.exe 2000 rmass.exe -
resource yara_rule behavioral1/memory/2004-0-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral1/memory/2004-11-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral1/files/0x000b000000015d31-7.dat upx behavioral1/memory/2000-13-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral1/memory/2400-25-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral1/memory/2000-24-0x0000000000360000-0x0000000000371000-memory.dmp upx behavioral1/memory/2000-60-0x0000000000400000-0x0000000000411000-memory.dmp upx -
description ioc Process 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 Set value (int) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\FirewallDisableNotify = "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\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\aset32.exe rmass.exe File opened for modification C:\Windows\SysWOW64\ntdbg.exe rmass.exe File created C:\Windows\SysWOW64\rmass.exe f537775e473e7ef09eaffb24889df490_NEIKI.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 f537775e473e7ef09eaffb24889df490_NEIKI.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 2000 rmass.exe 2000 rmass.exe 2000 rmass.exe 2400 rmass.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 2004 f537775e473e7ef09eaffb24889df490_NEIKI.exe Token: SeDebugPrivilege 2000 rmass.exe -
Suspicious use of WriteProcessMemory 10 IoCs
description pid Process procid_target PID 2004 wrote to memory of 2000 2004 f537775e473e7ef09eaffb24889df490_NEIKI.exe 28 PID 2004 wrote to memory of 2000 2004 f537775e473e7ef09eaffb24889df490_NEIKI.exe 28 PID 2004 wrote to memory of 2000 2004 f537775e473e7ef09eaffb24889df490_NEIKI.exe 28 PID 2004 wrote to memory of 2000 2004 f537775e473e7ef09eaffb24889df490_NEIKI.exe 28 PID 2000 wrote to memory of 436 2000 rmass.exe 5 PID 2000 wrote to memory of 2400 2000 rmass.exe 29 PID 2000 wrote to memory of 2400 2000 rmass.exe 29 PID 2000 wrote to memory of 2400 2000 rmass.exe 29 PID 2000 wrote to memory of 2400 2000 rmass.exe 29 PID 2000 wrote to memory of 1404 2000 rmass.exe 21
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:1404
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C:\Users\Admin\AppData\Local\Temp\f537775e473e7ef09eaffb24889df490_NEIKI.exe"C:\Users\Admin\AppData\Local\Temp\f537775e473e7ef09eaffb24889df490_NEIKI.exe"2⤵
- Loads dropped DLL
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2004 -
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:2000 -
C:\Windows\SysWOW64\rmass.exe--k33p4⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
PID:2400
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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
MD53700e20a6ab17f525b10b6a97ad73f83
SHA1ee897290471aad198fe2068df936a4319156b1ff
SHA2564a67f6c2092710a9de1c0a50ccfc59f4fba734bbcc9c3c7703453b859069d609
SHA512c306a821c93c67075761394b9ce7d5a9e64a1bc38f1b3299f38f11e21e95ebeb42e98de0a0630d1d07ef0da59502ac6fef2adda1309b439e337c6823de9f4216
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Filesize
25KB
MD51238884c172a47d062af3fc7a8933bd0
SHA12d7b73c85c90a357f4e3504d83c820f6a13fd195
SHA2565a9ce304129d275700360f29374cb1fc4ede8f66124bea2d1a418307eff35759
SHA51293315faac39a4914a736ea806cd9c28a112fe095800ba56e53ba0888662888f9b7c875db0ebfa49c336077f7b0ae213f582dd2a4d2c5d040c33ab1ec8c014c3d
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Filesize
21KB
MD5f537775e473e7ef09eaffb24889df490
SHA1b41031414c7ba6dc3b0f57ee7b84cc9942d06edb
SHA2564672e5a178fc023be578c92ff551ff106837336c596824d3c46f2f48d6e6f798
SHA51249a73992cd501c05b303bf9ff5ade07745c666703f961816ae9238b30e7ed4b51ad1be8d46f932fd9a351be170ce6dcd4a43e5355a29b3824dcae7a777186a70
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Filesize
1KB
MD5b10b13206b0f2cf3968050072f6979bf
SHA1699db21ba9cecf3f13ac3d76e22cfa41aa94da80
SHA2560eef3217095cb97b695c434e74d6314bf9e869a013d6e9c88e58c34576a276b4
SHA512d33bfd931be6676539507a69101d99fa4c5ef36b12422bd11f063b9b6a47b7444f6c4ad5f35e044714fdb872e96cd9fddf049e8329af1219483887f6ac5f4a5d