Analysis
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max time kernel
149s -
max time network
129s -
platform
windows10-2004_x64 -
resource
win10v2004-20240508-en -
resource tags
arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system -
submitted
04-06-2024 01:19
Static task
static1
Behavioral task
behavioral1
Sample
a9a39d5e0784353926e00fba08fffd809e9fa566b9f3fe359ecc4cc37e3361f3.exe
Resource
win7-20240508-en
Behavioral task
behavioral2
Sample
a9a39d5e0784353926e00fba08fffd809e9fa566b9f3fe359ecc4cc37e3361f3.exe
Resource
win10v2004-20240508-en
General
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Target
a9a39d5e0784353926e00fba08fffd809e9fa566b9f3fe359ecc4cc37e3361f3.exe
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Size
45KB
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MD5
7f480131bb7fe36b0fa59fe13e955a16
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SHA1
25d88182d2c2f06aa92bf7af2c5b55f57bbd1970
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SHA256
a9a39d5e0784353926e00fba08fffd809e9fa566b9f3fe359ecc4cc37e3361f3
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SHA512
9effdf9abca09f659f2fc7567900d08ebb7bc0931feb76116e57a7cbfb1287f6402e69cc83ea82759095f598514b0e88782ee708024cab8a692260964b0c745d
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SSDEEP
768:WAUJmQCcmLCXQq6fsKiJYsIkjJVzqsVG5kuGVAQvKMb7r6:RUNHFKQbIkHvGkAFu7e
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 Set value (int) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{47594C51-574a-434e-4759-4C51574A434e}\IsInstalled = "1" rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{47594C51-574a-434e-4759-4C51574A434e}\StubPath = "C:\\Windows\\system32\\ahuy.exe" rmass.exe Key created \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{47594C51-574a-434e-4759-4C51574A434e} rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{47594C51-574a-434e-4759-4C51574A434e}\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 4868 rmass.exe 764 rmass.exe -
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\ntdbg.exe rmass.exe File opened for modification C:\Windows\SysWOW64\ahuy.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\idbg32.exe rmass.exe File opened for modification C:\Windows\SysWOW64\rmass.exe rmass.exe File opened for modification C:\Windows\SysWOW64\rmass.exe a9a39d5e0784353926e00fba08fffd809e9fa566b9f3fe359ecc4cc37e3361f3.exe File created C:\Windows\SysWOW64\rmass.exe a9a39d5e0784353926e00fba08fffd809e9fa566b9f3fe359ecc4cc37e3361f3.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\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 4868 rmass.exe 4868 rmass.exe 4868 rmass.exe 4868 rmass.exe 4868 rmass.exe 4868 rmass.exe 764 rmass.exe 764 rmass.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 4908 a9a39d5e0784353926e00fba08fffd809e9fa566b9f3fe359ecc4cc37e3361f3.exe Token: SeDebugPrivilege 4868 rmass.exe -
Suspicious use of WriteProcessMemory 8 IoCs
description pid Process procid_target PID 4908 wrote to memory of 4868 4908 a9a39d5e0784353926e00fba08fffd809e9fa566b9f3fe359ecc4cc37e3361f3.exe 90 PID 4908 wrote to memory of 4868 4908 a9a39d5e0784353926e00fba08fffd809e9fa566b9f3fe359ecc4cc37e3361f3.exe 90 PID 4908 wrote to memory of 4868 4908 a9a39d5e0784353926e00fba08fffd809e9fa566b9f3fe359ecc4cc37e3361f3.exe 90 PID 4868 wrote to memory of 764 4868 rmass.exe 91 PID 4868 wrote to memory of 764 4868 rmass.exe 91 PID 4868 wrote to memory of 764 4868 rmass.exe 91 PID 4868 wrote to memory of 624 4868 rmass.exe 5 PID 4868 wrote to memory of 3524 4868 rmass.exe 56
Processes
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C:\Windows\system32\winlogon.exewinlogon.exe1⤵PID:624
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C:\Windows\Explorer.EXEC:\Windows\Explorer.EXE1⤵PID:3524
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C:\Users\Admin\AppData\Local\Temp\a9a39d5e0784353926e00fba08fffd809e9fa566b9f3fe359ecc4cc37e3361f3.exe"C:\Users\Admin\AppData\Local\Temp\a9a39d5e0784353926e00fba08fffd809e9fa566b9f3fe359ecc4cc37e3361f3.exe"2⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4908 -
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:4868 -
C:\Windows\SysWOW64\rmass.exe--k33p4⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
PID:764
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C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --field-trial-handle=4164,i,13281073920029625837,8253721632651544158,262144 --variations-seed-version --mojo-platform-channel-handle=4464 /prefetch:81⤵PID:1552
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
47KB
MD5119e2a8f94de3b25b40ca9dae7ece70e
SHA18362f9013d93955851e91aa6e51762480ee311f8
SHA25668478d3697e2c31f406a7c41b67782bdc33dcea8e76f6879c5c8b7416ad84047
SHA512be61b4ea0913549c77f693723b63293b13a14ad921868868b4e7760f208fbd94b6f3b985863cfba3fed2fbd5a43458ce873e50192b1ccbfc0e9c70d4944a578e
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Filesize
48KB
MD5fed0d992c6b4e158cf9223856eda9358
SHA1ccac8e2e95ff6962fcfda21300738d16dc75746b
SHA2567d26f627886ee4c2304aa86aa503fe9fcf5d2e069a877bf374061582c22aef22
SHA512f8798f5cfa5cfb1bda6556d2a5ec73092f82fb0e6b78cedc31136b780e8f58dc3d7b599e19fb9744cb672e033d3b913e4ea1bd2245ad561f64567495ff9a83d8
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Filesize
45KB
MD57f480131bb7fe36b0fa59fe13e955a16
SHA125d88182d2c2f06aa92bf7af2c5b55f57bbd1970
SHA256a9a39d5e0784353926e00fba08fffd809e9fa566b9f3fe359ecc4cc37e3361f3
SHA5129effdf9abca09f659f2fc7567900d08ebb7bc0931feb76116e57a7cbfb1287f6402e69cc83ea82759095f598514b0e88782ee708024cab8a692260964b0c745d
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Filesize
1KB
MD56f47b62de25d1745e296a06b3f98ed19
SHA1a688bb35a4c8a5cc198985d624a1b5a6ac5b9f6f
SHA25615c7218eb9cef5fa0573db657b15ce3a5f0e0609f1166df8098ca7152df505b4
SHA512dea26fff8060f44bf20fe4fff2ecbacf428727f10c0f5886fb4813e28fce9cbc3d088337c84edd9857b18514c83f1bb1cf0f51518aaecef09f30e921f4d758d7