Analysis
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max time kernel
119s -
max time network
94s -
platform
windows10-2004_x64 -
resource
win10v2004-20241007-en -
resource tags
arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system -
submitted
14-11-2024 02:24
Static task
static1
Behavioral task
behavioral1
Sample
40d218c3f19e478ed585f89ee2e3e67fa09945f90c4df0150cca37a261201bb8N.exe
Resource
win7-20240708-en
Behavioral task
behavioral2
Sample
40d218c3f19e478ed585f89ee2e3e67fa09945f90c4df0150cca37a261201bb8N.exe
Resource
win10v2004-20241007-en
General
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Target
40d218c3f19e478ed585f89ee2e3e67fa09945f90c4df0150cca37a261201bb8N.exe
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Size
24KB
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MD5
80551361d59d5eed8bdb86f25721d0a0
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SHA1
815c441cb53112961673dd9c1fbd54bda3fec2d4
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SHA256
40d218c3f19e478ed585f89ee2e3e67fa09945f90c4df0150cca37a261201bb8
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SHA512
c4d65fe0a63a418ccb1eadb325151f6d7d138080bb95301b4982c283ebcb4ba1088e7447579eee7e8939a5cd4888747713a98de1b5481e88d58dc7e124deb582
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SSDEEP
384:jIz4pE5UCpXa9/ElK4asLjnMM3dnKiXBkucF7Cr+RcQc41GM7yFaCDnJ6IUaNXHR:jIUpNppCPzXBkVF7Cr+RcQAEyouJ6Ij
Malware Config
Signatures
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Processes:
rmass.exedescription 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 -
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.
Processes:
rmass.exedescription ioc Process Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4F464741-4455-5345-4F46-474144555345}\StubPath = "C:\\Windows\\system32\\ahuy.exe" rmass.exe Key created \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4F464741-4455-5345-4F46-474144555345} rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4F464741-4455-5345-4F46-474144555345}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a" rmass.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4F464741-4455-5345-4F46-474144555345}\IsInstalled = "1" rmass.exe -
Drops file in Drivers directory 1 IoCs
Processes:
rmass.exedescription 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
Processes:
rmass.exedescription ioc Process Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exe\Debugger = "C:\\Windows\\system32\\ntdbg.exe" rmass.exe 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 -
Executes dropped EXE 2 IoCs
Processes:
rmass.exermass.exepid Process 2208 rmass.exe 5012 rmass.exe -
Processes:
rmass.exedescription 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 -
Processes:
rmass.exedescription 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
Processes:
rmass.exedescription 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
Processes:
rmass.exe40d218c3f19e478ed585f89ee2e3e67fa09945f90c4df0150cca37a261201bb8N.exedescription ioc Process 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 opened for modification C:\Windows\SysWOW64\aset32.exe rmass.exe File opened for modification C:\Windows\SysWOW64\rmass.exe rmass.exe File opened for modification C:\Windows\SysWOW64\rmass.exe 40d218c3f19e478ed585f89ee2e3e67fa09945f90c4df0150cca37a261201bb8N.exe File created C:\Windows\SysWOW64\rmass.exe 40d218c3f19e478ed585f89ee2e3e67fa09945f90c4df0150cca37a261201bb8N.exe File created C:\Windows\SysWOW64\ntdbg.exe rmass.exe File opened for modification C:\Windows\SysWOW64\idbg32.exe rmass.exe File opened for modification C:\Windows\SysWOW64\ntdbg.exe rmass.exe File created C:\Windows\SysWOW64\RECOVER32.DLL rmass.exe File opened for modification C:\Windows\SysWOW64\winrnt.exe rmass.exe -
Processes:
resource yara_rule behavioral2/files/0x000c000000023b31-2.dat upx behavioral2/memory/2208-4-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral2/memory/2208-39-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral2/memory/5012-44-0x0000000000400000-0x0000000000411000-memory.dmp upx -
Drops file in Program Files directory 3 IoCs
Processes:
rmass.exedescription 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.
Processes:
40d218c3f19e478ed585f89ee2e3e67fa09945f90c4df0150cca37a261201bb8N.exermass.exedescription ioc Process Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language 40d218c3f19e478ed585f89ee2e3e67fa09945f90c4df0150cca37a261201bb8N.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language rmass.exe -
Suspicious behavior: EnumeratesProcesses 8 IoCs
Processes:
rmass.exermass.exepid Process 2208 rmass.exe 2208 rmass.exe 2208 rmass.exe 2208 rmass.exe 2208 rmass.exe 2208 rmass.exe 5012 rmass.exe 5012 rmass.exe -
Suspicious use of AdjustPrivilegeToken 1 IoCs
Processes:
rmass.exedescription pid Process Token: SeDebugPrivilege 2208 rmass.exe -
Suspicious use of WriteProcessMemory 8 IoCs
Processes:
40d218c3f19e478ed585f89ee2e3e67fa09945f90c4df0150cca37a261201bb8N.exermass.exedescription pid Process procid_target PID 2216 wrote to memory of 2208 2216 40d218c3f19e478ed585f89ee2e3e67fa09945f90c4df0150cca37a261201bb8N.exe 83 PID 2216 wrote to memory of 2208 2216 40d218c3f19e478ed585f89ee2e3e67fa09945f90c4df0150cca37a261201bb8N.exe 83 PID 2216 wrote to memory of 2208 2216 40d218c3f19e478ed585f89ee2e3e67fa09945f90c4df0150cca37a261201bb8N.exe 83 PID 2208 wrote to memory of 5012 2208 rmass.exe 84 PID 2208 wrote to memory of 5012 2208 rmass.exe 84 PID 2208 wrote to memory of 5012 2208 rmass.exe 84 PID 2208 wrote to memory of 612 2208 rmass.exe 5 PID 2208 wrote to memory of 3508 2208 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:3508
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C:\Users\Admin\AppData\Local\Temp\40d218c3f19e478ed585f89ee2e3e67fa09945f90c4df0150cca37a261201bb8N.exe"C:\Users\Admin\AppData\Local\Temp\40d218c3f19e478ed585f89ee2e3e67fa09945f90c4df0150cca37a261201bb8N.exe"2⤵
- Drops file in System32 directory
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2216 -
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:2208 -
C:\Windows\SysWOW64\rmass.exe--k33p4⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
PID:5012
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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
24KB
MD5dab3f5982ee7cb3cb8968be3f6410480
SHA10bf64e0f871677449aadffb2b5cce1c25a358446
SHA25675da74940d9a60fd6641afceb333e79abd26a27718df65389e8a9c4fbe12c5e5
SHA51233755908e64297b6369be25eb2588e8e9b1cf56e256ebbd2b0ef6f41791cfac26b3312dc39fb8998a1ceb1ee82240e104dd06cc442f3aaf34a574896be04b084
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Filesize
25KB
MD50c16f85595938a294031c1073a1184a6
SHA11946ade461b693a2075851bfbf87e6fa9676f6ec
SHA25611f6f8109a24ea74e68236ab226e9e2f26f2ae4d82f5f7cbf9a5a9d19207afd5
SHA5127de3ccb40e79a3b7433873b30562e29b30c2703920f862e7584b3911496a79f4feee79c181a82559e989f42e1ceaf396fdda5023cc3469c62b4ad69f0287d1d6
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Filesize
22KB
MD5bcc593790f24b746c7c5d31125939353
SHA1fe83202147da98d84ab0691412eb0fac75846b87
SHA256b76d0b2eb575eaa9d330f4405ed7f22704f3057b20aa60a2a09e4e5ef65a6bd4
SHA512191a3e7fb76022940208e174445aec508fa1e4bd03b6a01eebc7ab6b37401458d6dd140663bdc5bcee256a7eca45997c945949c7d4e4357615e2c9382ecc8bcb