Analysis
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max time kernel
149s -
max time network
125s -
platform
windows7_x64 -
resource
win7-20240903-en -
resource tags
arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system -
submitted
13-11-2024 02:11
Behavioral task
behavioral1
Sample
bbac3dbdce8189c0f682845f9e89f4bc1d99fda035d004519f0ef3da0cf351f4.exe
Resource
win7-20240903-en
Behavioral task
behavioral2
Sample
bbac3dbdce8189c0f682845f9e89f4bc1d99fda035d004519f0ef3da0cf351f4.exe
Resource
win10v2004-20241007-en
General
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Target
bbac3dbdce8189c0f682845f9e89f4bc1d99fda035d004519f0ef3da0cf351f4.exe
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Size
63KB
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MD5
9166bbe6b2dbe4282017f49265dd44ca
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SHA1
ca7f9b36a1e068278bfdf6d89d4703cb1a34d847
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SHA256
bbac3dbdce8189c0f682845f9e89f4bc1d99fda035d004519f0ef3da0cf351f4
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SHA512
d026686bb9a1af448f334c6065fafe8be9f19b485ca6c639872cc8a8153e7c7c619770ba5b716232293a75521a104463b64dc0d8d34653c3034055053eba11f1
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SSDEEP
768:rAUJmQCcmLCXQq6fsKiJYsIkjJVzqsVG5kuGKQLddOW/34WvLTkXWj:sUNHFKQbIkHvGMdOo40TL
Malware Config
Signatures
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Processes:
rmass.exedescription 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.
Processes:
rmass.exedescription ioc Process 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 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 -
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 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
Processes:
rmass.exermass.exepid Process 2244 rmass.exe 2212 rmass.exe -
Loads dropped DLL 3 IoCs
Processes:
bbac3dbdce8189c0f682845f9e89f4bc1d99fda035d004519f0ef3da0cf351f4.exermass.exepid Process 1928 bbac3dbdce8189c0f682845f9e89f4bc1d99fda035d004519f0ef3da0cf351f4.exe 1928 bbac3dbdce8189c0f682845f9e89f4bc1d99fda035d004519f0ef3da0cf351f4.exe 2244 rmass.exe -
Processes:
rmass.exedescription 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 -
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.exebbac3dbdce8189c0f682845f9e89f4bc1d99fda035d004519f0ef3da0cf351f4.exedescription ioc Process 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\rmass.exe rmass.exe File opened for modification C:\Windows\SysWOW64\aset32.exe rmass.exe File opened for modification C:\Windows\SysWOW64\rmass.exe bbac3dbdce8189c0f682845f9e89f4bc1d99fda035d004519f0ef3da0cf351f4.exe File created C:\Windows\SysWOW64\rmass.exe bbac3dbdce8189c0f682845f9e89f4bc1d99fda035d004519f0ef3da0cf351f4.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 created C:\Windows\SysWOW64\RECOVER32.DLL rmass.exe File opened for modification C:\Windows\SysWOW64\idbg32.exe rmass.exe -
Processes:
resource yara_rule behavioral1/memory/1928-0-0x0000000000400000-0x0000000000412000-memory.dmp upx behavioral1/files/0x000b00000001226a-4.dat upx behavioral1/memory/2244-15-0x0000000000400000-0x0000000000412000-memory.dmp upx behavioral1/memory/1928-10-0x0000000000400000-0x0000000000412000-memory.dmp upx behavioral1/memory/2244-45-0x0000000000400000-0x0000000000412000-memory.dmp upx behavioral1/memory/2212-55-0x0000000000400000-0x0000000000412000-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\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.
Processes:
rmass.exebbac3dbdce8189c0f682845f9e89f4bc1d99fda035d004519f0ef3da0cf351f4.exedescription ioc Process Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language rmass.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language bbac3dbdce8189c0f682845f9e89f4bc1d99fda035d004519f0ef3da0cf351f4.exe -
Suspicious behavior: EnumeratesProcesses 4 IoCs
Processes:
rmass.exermass.exepid Process 2244 rmass.exe 2244 rmass.exe 2244 rmass.exe 2212 rmass.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
bbac3dbdce8189c0f682845f9e89f4bc1d99fda035d004519f0ef3da0cf351f4.exermass.exedescription pid Process Token: SeDebugPrivilege 1928 bbac3dbdce8189c0f682845f9e89f4bc1d99fda035d004519f0ef3da0cf351f4.exe Token: SeDebugPrivilege 2244 rmass.exe -
Suspicious use of WriteProcessMemory 10 IoCs
Processes:
bbac3dbdce8189c0f682845f9e89f4bc1d99fda035d004519f0ef3da0cf351f4.exermass.exedescription pid Process procid_target PID 1928 wrote to memory of 2244 1928 bbac3dbdce8189c0f682845f9e89f4bc1d99fda035d004519f0ef3da0cf351f4.exe 31 PID 1928 wrote to memory of 2244 1928 bbac3dbdce8189c0f682845f9e89f4bc1d99fda035d004519f0ef3da0cf351f4.exe 31 PID 1928 wrote to memory of 2244 1928 bbac3dbdce8189c0f682845f9e89f4bc1d99fda035d004519f0ef3da0cf351f4.exe 31 PID 1928 wrote to memory of 2244 1928 bbac3dbdce8189c0f682845f9e89f4bc1d99fda035d004519f0ef3da0cf351f4.exe 31 PID 2244 wrote to memory of 432 2244 rmass.exe 5 PID 2244 wrote to memory of 1208 2244 rmass.exe 21 PID 2244 wrote to memory of 2212 2244 rmass.exe 32 PID 2244 wrote to memory of 2212 2244 rmass.exe 32 PID 2244 wrote to memory of 2212 2244 rmass.exe 32 PID 2244 wrote to memory of 2212 2244 rmass.exe 32
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:1208
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C:\Users\Admin\AppData\Local\Temp\bbac3dbdce8189c0f682845f9e89f4bc1d99fda035d004519f0ef3da0cf351f4.exe"C:\Users\Admin\AppData\Local\Temp\bbac3dbdce8189c0f682845f9e89f4bc1d99fda035d004519f0ef3da0cf351f4.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:1928 -
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:2244 -
C:\Windows\SysWOW64\rmass.exe--k33p4⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
PID:2212
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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
65KB
MD5571cdf7cb706a32af53de1d899fdd55c
SHA1c57d16ec196d17c4f8b48ecd7a8e225df94ddf1c
SHA2564329446e3bc57cabcd0ebeb2a36e987d15dee0a0726fd4d2670a75a9745bebf3
SHA5125dbe9437703ddc0cb116b0e3bbb7222166b6e5ef24efdb7313ac0170ebf203b577498d9aaa9db37b496cde9914d28f62440a9fd54adc3c0dcce1ed13c7135f99
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Filesize
66KB
MD51185944d1a2fa89b27d31fff2795429d
SHA1d27bdcd1d0b328f53ed275dcfc3649f4b83f7a0c
SHA256e7b86e394ea92fb06f41f5fd0045b203b0c5d7744096dead379c4b814bb91f05
SHA51248df53779d1d9c271e2da476bbdb530531b691c356345a4b176d5484b2b1b4ec9eeef680c60a417d53bfcd09b9a53e35bca1beb217cecb43b2803fa82a30ba56
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Filesize
1KB
MD5b10b13206b0f2cf3968050072f6979bf
SHA1699db21ba9cecf3f13ac3d76e22cfa41aa94da80
SHA2560eef3217095cb97b695c434e74d6314bf9e869a013d6e9c88e58c34576a276b4
SHA512d33bfd931be6676539507a69101d99fa4c5ef36b12422bd11f063b9b6a47b7444f6c4ad5f35e044714fdb872e96cd9fddf049e8329af1219483887f6ac5f4a5d
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Filesize
63KB
MD59166bbe6b2dbe4282017f49265dd44ca
SHA1ca7f9b36a1e068278bfdf6d89d4703cb1a34d847
SHA256bbac3dbdce8189c0f682845f9e89f4bc1d99fda035d004519f0ef3da0cf351f4
SHA512d026686bb9a1af448f334c6065fafe8be9f19b485ca6c639872cc8a8153e7c7c619770ba5b716232293a75521a104463b64dc0d8d34653c3034055053eba11f1