Analysis
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max time kernel
149s -
max time network
151s -
platform
windows10-2004_x64 -
resource
win10v2004-20241007-en -
resource tags
arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system -
submitted
30/10/2024, 14:53
Static task
static1
Behavioral task
behavioral1
Sample
4ee9ec984e9b67d700a144ce7fdfe785f2b8cc2907ff9ee3b4fc4e7fb7fe0f55N.exe
Resource
win7-20240903-en
Behavioral task
behavioral2
Sample
4ee9ec984e9b67d700a144ce7fdfe785f2b8cc2907ff9ee3b4fc4e7fb7fe0f55N.exe
Resource
win10v2004-20241007-en
General
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Target
4ee9ec984e9b67d700a144ce7fdfe785f2b8cc2907ff9ee3b4fc4e7fb7fe0f55N.exe
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Size
49KB
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MD5
5c4f36b6ad585b5b03f615740f858680
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SHA1
2ce69bf1b549af12dce410996250a4bdcf48faca
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SHA256
4ee9ec984e9b67d700a144ce7fdfe785f2b8cc2907ff9ee3b4fc4e7fb7fe0f55
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SHA512
16e88a0d7a6cb94280dc64150da603fa709d4e94f89fa0ba3cad4f1374fb1a7964fdd36a7c65a9860ff2180cd76e771521e93176b43644b77e082677f9775225
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SSDEEP
768:jIUk6esQOVK0RNBwwboEeQBRsxX7P2A5Ah66ggzEmDmHjQy:jSowgKSHsxX6A2WeDmL
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 -
Boot or Logon Autostart Execution: Active Setup 2 TTPs 4 IoCs
Adversaries may achieve persistence by adding a Registry key to the Active Setup of the local machine.
description ioc Process Key created \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{47554D4C-4e4c-4645-4755-4D4C4E4C4645} rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{47554D4C-4e4c-4645-4755-4D4C4E4C4645}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a" rmass.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{47554D4C-4e4c-4645-4755-4D4C4E4C4645}\IsInstalled = "1" rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{47554D4C-4e4c-4645-4755-4D4C4E4C4645}\StubPath = "C:\\Windows\\system32\\ahuy.exe" rmass.exe -
Drops file in Drivers directory 1 IoCs
description ioc Process File opened for modification C:\Windows\system32\drivers\etc\hosts rmass.exe -
Event Triggered Execution: Image File Execution Options Injection 1 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 3532 rmass.exe 4348 rmass.exe -
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 -
description ioc Process Delete value \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exe\Debugger 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\rmass.exe 4ee9ec984e9b67d700a144ce7fdfe785f2b8cc2907ff9ee3b4fc4e7fb7fe0f55N.exe File opened for modification C:\Windows\SysWOW64\winrnt.exe rmass.exe File opened for modification C:\Windows\SysWOW64\idbg32.exe rmass.exe File created C:\Windows\SysWOW64\rmass.exe 4ee9ec984e9b67d700a144ce7fdfe785f2b8cc2907ff9ee3b4fc4e7fb7fe0f55N.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 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\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\idbg32.exe rmass.exe 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 -
System Location Discovery: System Language Discovery 1 TTPs 2 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
description ioc Process Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language 4ee9ec984e9b67d700a144ce7fdfe785f2b8cc2907ff9ee3b4fc4e7fb7fe0f55N.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language rmass.exe -
Suspicious behavior: EnumeratesProcesses 8 IoCs
pid Process 3532 rmass.exe 3532 rmass.exe 3532 rmass.exe 3532 rmass.exe 3532 rmass.exe 3532 rmass.exe 4348 rmass.exe 4348 rmass.exe -
Suspicious use of AdjustPrivilegeToken 1 IoCs
description pid Process Token: SeDebugPrivilege 3532 rmass.exe -
Suspicious use of WriteProcessMemory 8 IoCs
description pid Process procid_target PID 3120 wrote to memory of 3532 3120 4ee9ec984e9b67d700a144ce7fdfe785f2b8cc2907ff9ee3b4fc4e7fb7fe0f55N.exe 84 PID 3120 wrote to memory of 3532 3120 4ee9ec984e9b67d700a144ce7fdfe785f2b8cc2907ff9ee3b4fc4e7fb7fe0f55N.exe 84 PID 3120 wrote to memory of 3532 3120 4ee9ec984e9b67d700a144ce7fdfe785f2b8cc2907ff9ee3b4fc4e7fb7fe0f55N.exe 84 PID 3532 wrote to memory of 4348 3532 rmass.exe 85 PID 3532 wrote to memory of 4348 3532 rmass.exe 85 PID 3532 wrote to memory of 4348 3532 rmass.exe 85 PID 3532 wrote to memory of 612 3532 rmass.exe 5 PID 3532 wrote to memory of 3484 3532 rmass.exe 56
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:3484
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C:\Users\Admin\AppData\Local\Temp\4ee9ec984e9b67d700a144ce7fdfe785f2b8cc2907ff9ee3b4fc4e7fb7fe0f55N.exe"C:\Users\Admin\AppData\Local\Temp\4ee9ec984e9b67d700a144ce7fdfe785f2b8cc2907ff9ee3b4fc4e7fb7fe0f55N.exe"2⤵
- Drops file in System32 directory
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3120 -
C:\Windows\SysWOW64\rmass.exe"C:\Windows\SysWOW64\rmass.exe"3⤵
- Windows security bypass
- Boot or Logon Autostart Execution: Active Setup
- Drops file in Drivers directory
- Event Triggered Execution: Image File Execution Options Injection
- Executes dropped EXE
- Windows security modification
- Indicator Removal: Clear Persistence
- Modifies WinLogon
- Drops file in System32 directory
- Drops file in Program Files directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3532 -
C:\Windows\SysWOW64\rmass.exe--k33p4⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
PID:4348
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Network
MITRE ATT&CK Enterprise v15
Persistence
Boot or Logon Autostart Execution
2Active Setup
1Winlogon Helper DLL
1Event Triggered Execution
1Image File Execution Options Injection
1Privilege Escalation
Boot or Logon Autostart Execution
2Active Setup
1Winlogon Helper DLL
1Event Triggered Execution
1Image File Execution Options Injection
1Replay Monitor
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Downloads
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Filesize
5KB
MD512ff80c93916ec18553163d151a58a22
SHA142b06ecc5e03b767770f3ed0a12953326d0eede3
SHA256144c5d2d4d938ad383d96c96163254b5e757ddb049d30445776f4077580668de
SHA51250c29b2d567c75aa9b1bb2d4966d630a9747cdc50fc0843492a242068d67dc1c4fe418accb3acf6ce17e4831358d9acdab070aa81f673be086c589db6e5b7f67
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Filesize
49KB
MD56dccfdbfbccc2e501cbd9f1814ad5e4c
SHA1373d9e47cc86158283a44300cc7fdf5bcfc9ad7c
SHA2560c16a1b0e5ca2851304d6271374277b0750714ae973ae7d5066203ca333685f3
SHA5122013906bf0716fda7059b43a3e9d6576a831ef66b9eb8e7435cbca5dffceacb6fb7b88575bc32f7488d570b1bfa96525cad0fe52143fb50be0deb1f4fb438715
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Filesize
50KB
MD5f98b40bb3d35d91cae9de0c16e3ce934
SHA1fc00cd1619e532b301b7708c585a47c80e1deafd
SHA25635240d3ab1e50e349b4d5951432454fb624cc9260be8737d4afa87279c3e0ce0
SHA512fd30abf42379bc10e496ac172ec2f3400af2d9b66e8baa41a3518ca1701365b5caec974825f6f4f72647a2dbbcf1196edfa204fccf86ede28473ecaf7cecaacc
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Filesize
46KB
MD5560ad83daaedd76f2e111a3e0fcfcb05
SHA11cb9082ecf83c06ea04a40d8233f5b4e209f78b8
SHA256f3984e23d9b498dfc7bed2ea9c6c07b1b7eee2e796307422368ee1586b60c130
SHA512dae737f0fd6182b66f1d740710b96686e8208fb048e215e6bf990991aafa0faa154c24966e57f9f3d5136c58e51cf1956a4c2dcf3c3817361fde3d3f7e45ca35
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Filesize
1KB
MD56f47b62de25d1745e296a06b3f98ed19
SHA1a688bb35a4c8a5cc198985d624a1b5a6ac5b9f6f
SHA25615c7218eb9cef5fa0573db657b15ce3a5f0e0609f1166df8098ca7152df505b4
SHA512dea26fff8060f44bf20fe4fff2ecbacf428727f10c0f5886fb4813e28fce9cbc3d088337c84edd9857b18514c83f1bb1cf0f51518aaecef09f30e921f4d758d7