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Analysis
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max time kernel
150s -
max time network
153s -
platform
windows10-2004_x64 -
resource
win10v2004-20231020-en -
resource tags
arch:x64arch:x86image:win10v2004-20231020-enlocale:en-usos:windows10-2004-x64system -
submitted
17/11/2023, 00:42
Static task
static1
Behavioral task
behavioral1
Sample
NEAS.c57ead958ef99c2b4c140baa6ce333c0.exe
Resource
win7-20231025-en
Behavioral task
behavioral2
Sample
NEAS.c57ead958ef99c2b4c140baa6ce333c0.exe
Resource
win10v2004-20231020-en
General
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Target
NEAS.c57ead958ef99c2b4c140baa6ce333c0.exe
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Size
21KB
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MD5
c57ead958ef99c2b4c140baa6ce333c0
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SHA1
6bac44ca490c20f8600950e37bfe85285b4de282
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SHA256
f64f4c98c3ed3b6bddd386825eb449cbec31bb25a84729b768295f88402b7677
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SHA512
279d05564714e099574671cd9466002a443f6efe32cb21f066845ddd9f0a1fd9e67c7bad9ffa456905d1aec09773dfd429b5adc174d80e7f5f3bbcb3d5f2d35e
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SSDEEP
384:jIz4sOPwP1mSKBmjpLxoYiekKrYGsUikOPkxOXayYl6mMyIzpegjX:jIUsddqUj4YilKrz4Pk4pYI9D
Malware Config
Signatures
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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 -
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\{51494146-4147-584b-5149-41464147584b}\IsInstalled = "1" rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{51494146-4147-584b-5149-41464147584b}\StubPath = "C:\\Windows\\system32\\ahuy.exe" rmass.exe Key created \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{51494146-4147-584b-5149-41464147584b} rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{51494146-4147-584b-5149-41464147584b}\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 1876 rmass.exe 3204 rmass.exe -
resource yara_rule behavioral2/files/0x000500000001e9bf-4.dat upx behavioral2/files/0x000500000001e9bf-3.dat upx behavioral2/memory/1876-5-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral2/files/0x000500000001e9bf-10.dat upx behavioral2/memory/1876-75-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral2/memory/3204-85-0x0000000000400000-0x0000000000411000-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\{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 created C:\Windows\SysWOW64\rmass.exe NEAS.c57ead958ef99c2b4c140baa6ce333c0.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\RECOVER32.DLL rmass.exe File opened for modification C:\Windows\SysWOW64\idbg32.exe rmass.exe File opened for modification C:\Windows\SysWOW64\rmass.exe NEAS.c57ead958ef99c2b4c140baa6ce333c0.exe File created C:\Windows\SysWOW64\ntdbg.exe rmass.exe File created C:\Windows\SysWOW64\ahuy.exe rmass.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\aset32.exe 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 8 IoCs
pid Process 1876 rmass.exe 1876 rmass.exe 1876 rmass.exe 1876 rmass.exe 1876 rmass.exe 1876 rmass.exe 3204 rmass.exe 3204 rmass.exe -
Suspicious use of AdjustPrivilegeToken 1 IoCs
description pid Process Token: SeDebugPrivilege 1876 rmass.exe -
Suspicious use of WriteProcessMemory 8 IoCs
description pid Process procid_target PID 1188 wrote to memory of 1876 1188 NEAS.c57ead958ef99c2b4c140baa6ce333c0.exe 86 PID 1188 wrote to memory of 1876 1188 NEAS.c57ead958ef99c2b4c140baa6ce333c0.exe 86 PID 1188 wrote to memory of 1876 1188 NEAS.c57ead958ef99c2b4c140baa6ce333c0.exe 86 PID 1876 wrote to memory of 3204 1876 rmass.exe 87 PID 1876 wrote to memory of 3204 1876 rmass.exe 87 PID 1876 wrote to memory of 3204 1876 rmass.exe 87 PID 1876 wrote to memory of 616 1876 rmass.exe 6 PID 1876 wrote to memory of 3256 1876 rmass.exe 47
Processes
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C:\Windows\system32\winlogon.exewinlogon.exe1⤵PID:616
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C:\Windows\Explorer.EXEC:\Windows\Explorer.EXE1⤵PID:3256
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C:\Users\Admin\AppData\Local\Temp\NEAS.c57ead958ef99c2b4c140baa6ce333c0.exe"C:\Users\Admin\AppData\Local\Temp\NEAS.c57ead958ef99c2b4c140baa6ce333c0.exe"2⤵
- Drops file in System32 directory
- Suspicious use of WriteProcessMemory
PID:1188 -
C:\Windows\SysWOW64\rmass.exe"C:\Windows\SysWOW64\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:1876 -
C:\Windows\SysWOW64\rmass.exe--k33p4⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
PID:3204
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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
MD5fc81335a476d1767d227b20374bcadcd
SHA119e61859adebb3c92c9be821b1297a2e0b20a758
SHA25698fd838df654cc0226b53a41fc2c7f214cf3606b9d8772c2c284b187f1f58b46
SHA5129acda5138dd1f6a31c949f899a8810516b5c7dfcacfea201067488e230d1dfd915f2e15a434ff27afea32e3d2729aebe4e251654aeda7cde731c09bc1799cb08
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Filesize
22KB
MD5c4ac0f8156e906c5ce75c12c47511de4
SHA1b49b2487ce9778a1822007917937706134789c78
SHA2568ec6c0eda2784306b7356d4901515d6e23834056fedee83485879c5913125c7d
SHA5121976be92e9c92c49abc661343b2ad6d73787f53d82079f5a061a1bc51519bfa66fc997cc05d014bc59dc7020d0e58e9a42704e57ce75c5d862136bc3887d64ec
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Filesize
19KB
MD5aab73f099c13687484d94d91b431eb7a
SHA120588702447ca2fe4b29b5ad4381e9fd6415cd95
SHA2569c86f4f520d1a90f9395ce38453db3fb0d716f52986af691467004bb52de4fec
SHA512b2e4e44e39fcb6528c4490a2c976f4faa5a892e1f2b6b806a368fb856a2ef46416eb5a1dc9414113547063c2feed15c40b6060805466ca6a7d9fb71a7a02c388
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Filesize
19KB
MD5aab73f099c13687484d94d91b431eb7a
SHA120588702447ca2fe4b29b5ad4381e9fd6415cd95
SHA2569c86f4f520d1a90f9395ce38453db3fb0d716f52986af691467004bb52de4fec
SHA512b2e4e44e39fcb6528c4490a2c976f4faa5a892e1f2b6b806a368fb856a2ef46416eb5a1dc9414113547063c2feed15c40b6060805466ca6a7d9fb71a7a02c388
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Filesize
19KB
MD5aab73f099c13687484d94d91b431eb7a
SHA120588702447ca2fe4b29b5ad4381e9fd6415cd95
SHA2569c86f4f520d1a90f9395ce38453db3fb0d716f52986af691467004bb52de4fec
SHA512b2e4e44e39fcb6528c4490a2c976f4faa5a892e1f2b6b806a368fb856a2ef46416eb5a1dc9414113547063c2feed15c40b6060805466ca6a7d9fb71a7a02c388
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Filesize
1KB
MD56f47b62de25d1745e296a06b3f98ed19
SHA1a688bb35a4c8a5cc198985d624a1b5a6ac5b9f6f
SHA25615c7218eb9cef5fa0573db657b15ce3a5f0e0609f1166df8098ca7152df505b4
SHA512dea26fff8060f44bf20fe4fff2ecbacf428727f10c0f5886fb4813e28fce9cbc3d088337c84edd9857b18514c83f1bb1cf0f51518aaecef09f30e921f4d758d7