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Analysis
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max time kernel
119s -
max time network
117s -
platform
windows7_x64 -
resource
win7-20240903-en -
resource tags
arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system -
submitted
30/09/2024, 19:15
Behavioral task
behavioral1
Sample
a797b8d85a1a3654cf2578b3025e2d265fd9c45ecfea95d7b9c2a08eaa0d9a43N.exe
Resource
win7-20240903-en
Behavioral task
behavioral2
Sample
a797b8d85a1a3654cf2578b3025e2d265fd9c45ecfea95d7b9c2a08eaa0d9a43N.exe
Resource
win10v2004-20240802-en
General
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Target
a797b8d85a1a3654cf2578b3025e2d265fd9c45ecfea95d7b9c2a08eaa0d9a43N.exe
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Size
20KB
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MD5
8fce0865c8cce17a58b7afe940d30380
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SHA1
56e081a51ae2690f2280eabcf6a4b1008261203c
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SHA256
a797b8d85a1a3654cf2578b3025e2d265fd9c45ecfea95d7b9c2a08eaa0d9a43
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SHA512
3f7834ae93dd9e7b68c1b1a9e2e5e02a07169f54072b441200da42d52518413349a1169a00d5a06ffaf460b5f0081cc88ce6eb421d2e9550a034e85230f52c7f
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SSDEEP
384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvXziCybr:rRkiLw3HsDSARGG/jfer
Malware Config
Signatures
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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 -
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 Set value (int) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{5A514142-4f50-5745-5A51-41424F505745}\IsInstalled = "1" rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{5A514142-4f50-5745-5A51-41424F505745}\StubPath = "C:\\Windows\\system32\\ahuy.exe" rmass.exe Key created \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{5A514142-4f50-5745-5A51-41424F505745} rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{5A514142-4f50-5745-5A51-41424F505745}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a" 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 2084 rmass.exe 1108 rmass.exe -
Loads dropped DLL 3 IoCs
pid Process 812 a797b8d85a1a3654cf2578b3025e2d265fd9c45ecfea95d7b9c2a08eaa0d9a43N.exe 812 a797b8d85a1a3654cf2578b3025e2d265fd9c45ecfea95d7b9c2a08eaa0d9a43N.exe 2084 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 opened for modification C:\Windows\SysWOW64\ntdbg.exe rmass.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 File opened for modification C:\Windows\SysWOW64\rmass.exe a797b8d85a1a3654cf2578b3025e2d265fd9c45ecfea95d7b9c2a08eaa0d9a43N.exe File created C:\Windows\SysWOW64\rmass.exe a797b8d85a1a3654cf2578b3025e2d265fd9c45ecfea95d7b9c2a08eaa0d9a43N.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 -
resource yara_rule behavioral1/memory/812-0-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral1/files/0x000c00000001226b-7.dat upx behavioral1/memory/1108-26-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral1/memory/812-11-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral1/memory/2084-13-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral1/memory/2084-48-0x0000000000400000-0x0000000000411000-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\aset32.exe rmass.exe 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 -
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 a797b8d85a1a3654cf2578b3025e2d265fd9c45ecfea95d7b9c2a08eaa0d9a43N.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language rmass.exe -
Suspicious behavior: EnumeratesProcesses 4 IoCs
pid Process 2084 rmass.exe 2084 rmass.exe 2084 rmass.exe 1108 rmass.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 812 a797b8d85a1a3654cf2578b3025e2d265fd9c45ecfea95d7b9c2a08eaa0d9a43N.exe Token: SeDebugPrivilege 2084 rmass.exe -
Suspicious use of WriteProcessMemory 10 IoCs
description pid Process procid_target PID 812 wrote to memory of 2084 812 a797b8d85a1a3654cf2578b3025e2d265fd9c45ecfea95d7b9c2a08eaa0d9a43N.exe 30 PID 812 wrote to memory of 2084 812 a797b8d85a1a3654cf2578b3025e2d265fd9c45ecfea95d7b9c2a08eaa0d9a43N.exe 30 PID 812 wrote to memory of 2084 812 a797b8d85a1a3654cf2578b3025e2d265fd9c45ecfea95d7b9c2a08eaa0d9a43N.exe 30 PID 812 wrote to memory of 2084 812 a797b8d85a1a3654cf2578b3025e2d265fd9c45ecfea95d7b9c2a08eaa0d9a43N.exe 30 PID 2084 wrote to memory of 428 2084 rmass.exe 5 PID 2084 wrote to memory of 1224 2084 rmass.exe 21 PID 2084 wrote to memory of 1108 2084 rmass.exe 31 PID 2084 wrote to memory of 1108 2084 rmass.exe 31 PID 2084 wrote to memory of 1108 2084 rmass.exe 31 PID 2084 wrote to memory of 1108 2084 rmass.exe 31
Processes
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C:\Windows\system32\winlogon.exewinlogon.exe1⤵PID:428
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C:\Windows\Explorer.EXEC:\Windows\Explorer.EXE1⤵PID:1224
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C:\Users\Admin\AppData\Local\Temp\a797b8d85a1a3654cf2578b3025e2d265fd9c45ecfea95d7b9c2a08eaa0d9a43N.exe"C:\Users\Admin\AppData\Local\Temp\a797b8d85a1a3654cf2578b3025e2d265fd9c45ecfea95d7b9c2a08eaa0d9a43N.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:812 -
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:2084 -
C:\Windows\SysWOW64\rmass.exe--k33p4⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
PID:1108
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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
22KB
MD597f45b32a185c3fb7cc06188c8f84864
SHA148152a83603dca0e878f491455b9d8041d43a214
SHA25618f0178b21a59bd504f1d0eccb6213307e2a01ce4908903bd506251c2cb0b9ed
SHA512acfbbe38518c69afefb9d2f1ecf6a0d04a836134bd8589f6bd500851ab2a1a0f83488b9d23598a38dbceb9651a76ecceb86cae52636839ccce30bea8e066df92
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Filesize
23KB
MD504944af5b2aacb5bd32424cdde4b8a48
SHA1dc20058d31651b435f9b0c00d911de1b61e2340d
SHA256e24d0a63ba9309cd5411bf909a20320a2b9568b9b2901c7d095962c0e5f9897d
SHA512861e99968de4fc8675d99deb9b106c36c207cf0615b4a40d7ace4937b10d08c4c21af2b0acead266742f3e270bb2ee3c1cc2cd4ccf836ba6028c44152ec5483e
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Filesize
20KB
MD58fce0865c8cce17a58b7afe940d30380
SHA156e081a51ae2690f2280eabcf6a4b1008261203c
SHA256a797b8d85a1a3654cf2578b3025e2d265fd9c45ecfea95d7b9c2a08eaa0d9a43
SHA5123f7834ae93dd9e7b68c1b1a9e2e5e02a07169f54072b441200da42d52518413349a1169a00d5a06ffaf460b5f0081cc88ce6eb421d2e9550a034e85230f52c7f