Analysis
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max time kernel
120s -
max time network
122s -
platform
windows7_x64 -
resource
win7-20241010-en -
resource tags
arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system -
submitted
04/11/2024, 04:59
Behavioral task
behavioral1
Sample
52477199561794e3f8e5871c0226cc4d267f039ff66535554d4be1e19796fdd6N.exe
Resource
win7-20241010-en
Behavioral task
behavioral2
Sample
52477199561794e3f8e5871c0226cc4d267f039ff66535554d4be1e19796fdd6N.exe
Resource
win10v2004-20241007-en
General
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Target
52477199561794e3f8e5871c0226cc4d267f039ff66535554d4be1e19796fdd6N.exe
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Size
64KB
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MD5
58cc7772895672f3c1ad1eb2b089f080
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SHA1
3411881e2c0c92d496a310736aa4c7f6892fcefc
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SHA256
52477199561794e3f8e5871c0226cc4d267f039ff66535554d4be1e19796fdd6
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SHA512
508320d35dec15ef7fa906a178d81e74d650e0464dc099d0806030a0d9f6c2e17fac24f32d23b579e6b8effde1edf82842c1ec6b311b8115a217caaa1ff24abc
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SSDEEP
768:rAUJmQCcmLCXQq6fsKiJYsIkjJVzqsVG5kuGKQLddOW/p4WvEITH3i:sUNHFKQbIkHvGMdOq4b
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\{50494445-5552-5959-5049-444555525959} rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{50494445-5552-5959-5049-444555525959}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a" rmass.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{50494445-5552-5959-5049-444555525959}\IsInstalled = "1" rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{50494445-5552-5959-5049-444555525959}\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 2100 rmass.exe 2312 rmass.exe -
Loads dropped DLL 3 IoCs
pid Process 3044 52477199561794e3f8e5871c0226cc4d267f039ff66535554d4be1e19796fdd6N.exe 3044 52477199561794e3f8e5871c0226cc4d267f039ff66535554d4be1e19796fdd6N.exe 2100 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 -
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 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 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 -
Drops file in System32 directory 12 IoCs
description ioc Process 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 created C:\Windows\SysWOW64\rmass.exe 52477199561794e3f8e5871c0226cc4d267f039ff66535554d4be1e19796fdd6N.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 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 52477199561794e3f8e5871c0226cc4d267f039ff66535554d4be1e19796fdd6N.exe -
resource yara_rule behavioral1/memory/3044-0-0x0000000000400000-0x0000000000412000-memory.dmp upx behavioral1/files/0x000c000000012244-4.dat upx behavioral1/memory/3044-12-0x0000000000400000-0x0000000000412000-memory.dmp upx behavioral1/memory/2100-13-0x0000000000400000-0x0000000000412000-memory.dmp upx behavioral1/memory/2100-46-0x0000000000400000-0x0000000000412000-memory.dmp upx behavioral1/memory/2312-56-0x0000000000400000-0x0000000000412000-memory.dmp upx -
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 -
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 52477199561794e3f8e5871c0226cc4d267f039ff66535554d4be1e19796fdd6N.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language rmass.exe -
Suspicious behavior: EnumeratesProcesses 4 IoCs
pid Process 2100 rmass.exe 2100 rmass.exe 2100 rmass.exe 2312 rmass.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 3044 52477199561794e3f8e5871c0226cc4d267f039ff66535554d4be1e19796fdd6N.exe Token: SeDebugPrivilege 2100 rmass.exe -
Suspicious use of WriteProcessMemory 10 IoCs
description pid Process procid_target PID 3044 wrote to memory of 2100 3044 52477199561794e3f8e5871c0226cc4d267f039ff66535554d4be1e19796fdd6N.exe 30 PID 3044 wrote to memory of 2100 3044 52477199561794e3f8e5871c0226cc4d267f039ff66535554d4be1e19796fdd6N.exe 30 PID 3044 wrote to memory of 2100 3044 52477199561794e3f8e5871c0226cc4d267f039ff66535554d4be1e19796fdd6N.exe 30 PID 3044 wrote to memory of 2100 3044 52477199561794e3f8e5871c0226cc4d267f039ff66535554d4be1e19796fdd6N.exe 30 PID 2100 wrote to memory of 432 2100 rmass.exe 5 PID 2100 wrote to memory of 1204 2100 rmass.exe 21 PID 2100 wrote to memory of 2312 2100 rmass.exe 31 PID 2100 wrote to memory of 2312 2100 rmass.exe 31 PID 2100 wrote to memory of 2312 2100 rmass.exe 31 PID 2100 wrote to memory of 2312 2100 rmass.exe 31
Processes
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C:\Windows\system32\winlogon.exewinlogon.exe1⤵PID:432
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C:\Windows\Explorer.EXEC:\Windows\Explorer.EXE1⤵PID:1204
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C:\Users\Admin\AppData\Local\Temp\52477199561794e3f8e5871c0226cc4d267f039ff66535554d4be1e19796fdd6N.exe"C:\Users\Admin\AppData\Local\Temp\52477199561794e3f8e5871c0226cc4d267f039ff66535554d4be1e19796fdd6N.exe"2⤵
- Loads dropped DLL
- Drops file in System32 directory
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3044 -
C:\Windows\SysWOW64\rmass.exe"C:\Windows\system32\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
- Loads dropped DLL
- 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:2100 -
C:\Windows\SysWOW64\rmass.exe--k33p4⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
PID:2312
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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
MD52b2c28a7a01f9584fe220ef84003427f
SHA15fc023df0b5064045eb8de7f2dbe26f07f6fec70
SHA2569e00af53b1d0c0f5270d94a666d95aa7b4dcb9fea49487c210c055c9dcfcc9eb
SHA51239192a8a91dec1abff25af8dac0cf39da4dfd51b3fb4f1ef0b4e776185d4280fbe8387c2ea778da7bbf2ce288b0bce4d23cbe8d9e87bbd250159044f5adbac78
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Filesize
66KB
MD5085cf168bc681bbef609aca6c2f1965c
SHA137c58c4ade46faa6351d8fc97e400ba325f1874d
SHA256a98d6861228d519f92bf42dc432b4c2f667897c2a6b74b0da14190ffe805b686
SHA51255e70facb928075fe9d760f1c95228c80f1b5bbcb2e95c3839bb2981e407f642013d01b23445c8cb792c71b4dd15b3768a886a6d7dc01935ea0c0aa3b5b0b7a4
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Filesize
67KB
MD5e24282de0b84fcc6b7371ee203d99f3d
SHA15dd7a7c1517d69536aa4d604792d4799870784da
SHA256aba45fcbafa597112d3b82f7becaac7d7846dca880fae2934671f4b1d854cbef
SHA512b44cf9a04baffe9f945eb14c15de47bffe6a1e60e993875ce05222c21eb62de8c23d21cede107a910d12b1230b1462715d3f82abaf1194a9baa5414db49ece23
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Filesize
64KB
MD558cc7772895672f3c1ad1eb2b089f080
SHA13411881e2c0c92d496a310736aa4c7f6892fcefc
SHA25652477199561794e3f8e5871c0226cc4d267f039ff66535554d4be1e19796fdd6
SHA512508320d35dec15ef7fa906a178d81e74d650e0464dc099d0806030a0d9f6c2e17fac24f32d23b579e6b8effde1edf82842c1ec6b311b8115a217caaa1ff24abc