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Analysis
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max time kernel
149s -
max time network
151s -
platform
windows10-2004_x64 -
resource
win10v2004-20240419-en -
resource tags
arch:x64arch:x86image:win10v2004-20240419-enlocale:en-usos:windows10-2004-x64system -
submitted
07/05/2024, 21:59
Behavioral task
behavioral1
Sample
63f12f4bf0e169fb16f99e02ccd4242c435e5fa4103fd96f37cce1982f200c3e.exe
Resource
win7-20240221-en
Behavioral task
behavioral2
Sample
63f12f4bf0e169fb16f99e02ccd4242c435e5fa4103fd96f37cce1982f200c3e.exe
Resource
win10v2004-20240419-en
General
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Target
63f12f4bf0e169fb16f99e02ccd4242c435e5fa4103fd96f37cce1982f200c3e.exe
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Size
21KB
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MD5
215b750f5dd4ae4a4719ed47d167efb8
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SHA1
1bf6746df699e25a0a9bb756785f0aae7fb9ec65
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SHA256
63f12f4bf0e169fb16f99e02ccd4242c435e5fa4103fd96f37cce1982f200c3e
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SHA512
684ed443ffc4c86689388fbd14880e6ada066b0f04b5849952863ef5dfb5189ded342be956da3fffc04965e1a90be545a3c26217272630e2cfb4a0a8794af9d7
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SSDEEP
384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvX8Mb7a6y:rRkiLw3HsDSARGG/MMb7ry
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\{4C464B54-444a-474c-4C46-4B54444A474c} rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4C464B54-444a-474c-4C46-4B54444A474c}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a" rmass.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4C464B54-444a-474c-4C46-4B54444A474c}\IsInstalled = "1" rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4C464B54-444a-474c-4C46-4B54444A474c}\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 1972 rmass.exe 4028 rmass.exe -
resource yara_rule behavioral2/memory/3268-0-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral2/files/0x000c000000023b50-5.dat upx behavioral2/memory/3268-7-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral2/memory/1972-10-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral2/memory/4028-19-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral2/memory/4028-54-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral2/memory/1972-53-0x0000000000400000-0x0000000000411000-memory.dmp upx -
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 -
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\rmass.exe 63f12f4bf0e169fb16f99e02ccd4242c435e5fa4103fd96f37cce1982f200c3e.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\idbg32.exe rmass.exe File opened for modification C:\Windows\SysWOW64\rmass.exe rmass.exe File created C:\Windows\SysWOW64\rmass.exe 63f12f4bf0e169fb16f99e02ccd4242c435e5fa4103fd96f37cce1982f200c3e.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\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\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 8 IoCs
pid Process 1972 rmass.exe 1972 rmass.exe 1972 rmass.exe 1972 rmass.exe 1972 rmass.exe 1972 rmass.exe 4028 rmass.exe 4028 rmass.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 3268 63f12f4bf0e169fb16f99e02ccd4242c435e5fa4103fd96f37cce1982f200c3e.exe Token: SeDebugPrivilege 1972 rmass.exe -
Suspicious use of WriteProcessMemory 8 IoCs
description pid Process procid_target PID 3268 wrote to memory of 1972 3268 63f12f4bf0e169fb16f99e02ccd4242c435e5fa4103fd96f37cce1982f200c3e.exe 84 PID 3268 wrote to memory of 1972 3268 63f12f4bf0e169fb16f99e02ccd4242c435e5fa4103fd96f37cce1982f200c3e.exe 84 PID 3268 wrote to memory of 1972 3268 63f12f4bf0e169fb16f99e02ccd4242c435e5fa4103fd96f37cce1982f200c3e.exe 84 PID 1972 wrote to memory of 612 1972 rmass.exe 5 PID 1972 wrote to memory of 3456 1972 rmass.exe 56 PID 1972 wrote to memory of 4028 1972 rmass.exe 85 PID 1972 wrote to memory of 4028 1972 rmass.exe 85 PID 1972 wrote to memory of 4028 1972 rmass.exe 85
Processes
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C:\Windows\system32\winlogon.exewinlogon.exe1⤵PID:612
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C:\Windows\Explorer.EXEC:\Windows\Explorer.EXE1⤵PID:3456
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C:\Users\Admin\AppData\Local\Temp\63f12f4bf0e169fb16f99e02ccd4242c435e5fa4103fd96f37cce1982f200c3e.exe"C:\Users\Admin\AppData\Local\Temp\63f12f4bf0e169fb16f99e02ccd4242c435e5fa4103fd96f37cce1982f200c3e.exe"2⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3268 -
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
- 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:1972 -
C:\Windows\SysWOW64\rmass.exe--k33p4⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
PID:4028
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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
23KB
MD5b89b152524c8cc6d6664891c530dcca0
SHA1338010e37b8816b3b86885560257d3b8701a6c07
SHA256e76e7051df62d1aa7cee8d8f67664ef11acae448bbc9c4c77832f7c57c1b66eb
SHA512d6533bf9c2ebde013895a6612c1484de13ee5554f299c04a927d86427c5f6a0512c449109a28ffb5c4299a3e97c6f73db591fd73112d31548b43e673593b0969
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Filesize
24KB
MD5b04e84da3fa8bf91a7acadaaaaf807d4
SHA198ee2964f2ee4eba246f185383aef717e93fba16
SHA256b0bcc1ad50b40675777a86fe0bf06def932fe051b7db1798268ccf5337cbb1c4
SHA512b9acc2acbacae0d4c229963e0fba83b70c2c7f64a39f133dcbe383d9a14990c305e15d110eed5a4f44d254c86ad2b132e54b71b29e96d859888d1bd1b76b9ad8
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Filesize
21KB
MD5215b750f5dd4ae4a4719ed47d167efb8
SHA11bf6746df699e25a0a9bb756785f0aae7fb9ec65
SHA25663f12f4bf0e169fb16f99e02ccd4242c435e5fa4103fd96f37cce1982f200c3e
SHA512684ed443ffc4c86689388fbd14880e6ada066b0f04b5849952863ef5dfb5189ded342be956da3fffc04965e1a90be545a3c26217272630e2cfb4a0a8794af9d7
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Filesize
1KB
MD56f47b62de25d1745e296a06b3f98ed19
SHA1a688bb35a4c8a5cc198985d624a1b5a6ac5b9f6f
SHA25615c7218eb9cef5fa0573db657b15ce3a5f0e0609f1166df8098ca7152df505b4
SHA512dea26fff8060f44bf20fe4fff2ecbacf428727f10c0f5886fb4813e28fce9cbc3d088337c84edd9857b18514c83f1bb1cf0f51518aaecef09f30e921f4d758d7