Analysis
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max time kernel
149s -
max time network
156s -
platform
windows10-2004_x64 -
resource
win10v2004-20241007-en -
resource tags
arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-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\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 Key created \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{48474E42-5742-4757-4847-4E4257424757} rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{48474E42-5742-4757-4847-4E4257424757}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a" rmass.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{48474E42-5742-4757-4847-4E4257424757}\IsInstalled = "1" rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{48474E42-5742-4757-4847-4E4257424757}\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 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 Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exe rmass.exe -
Executes dropped EXE 2 IoCs
Processes:
rmass.exermass.exepid Process 3580 rmass.exe 4672 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}\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 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 -
Drops file in System32 directory 12 IoCs
Processes:
rmass.exebbac3dbdce8189c0f682845f9e89f4bc1d99fda035d004519f0ef3da0cf351f4.exedescription ioc Process File opened for modification C:\Windows\SysWOW64\idbg32.exe rmass.exe File opened for modification C:\Windows\SysWOW64\rmass.exe rmass.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 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\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\winrnt.exe rmass.exe -
Processes:
resource yara_rule behavioral2/memory/3892-0-0x0000000000400000-0x0000000000412000-memory.dmp upx behavioral2/files/0x000c000000023b27-6.dat upx behavioral2/memory/3892-11-0x0000000000400000-0x0000000000412000-memory.dmp upx behavioral2/memory/4672-17-0x0000000000400000-0x0000000000412000-memory.dmp upx behavioral2/memory/3580-42-0x0000000000400000-0x0000000000412000-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\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 3 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
Processes:
rmass.exermass.exebbac3dbdce8189c0f682845f9e89f4bc1d99fda035d004519f0ef3da0cf351f4.exedescription ioc Process Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language rmass.exe 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 8 IoCs
Processes:
rmass.exermass.exepid Process 3580 rmass.exe 3580 rmass.exe 3580 rmass.exe 3580 rmass.exe 3580 rmass.exe 3580 rmass.exe 4672 rmass.exe 4672 rmass.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
bbac3dbdce8189c0f682845f9e89f4bc1d99fda035d004519f0ef3da0cf351f4.exermass.exedescription pid Process Token: SeDebugPrivilege 3892 bbac3dbdce8189c0f682845f9e89f4bc1d99fda035d004519f0ef3da0cf351f4.exe Token: SeDebugPrivilege 3580 rmass.exe -
Suspicious use of WriteProcessMemory 8 IoCs
Processes:
bbac3dbdce8189c0f682845f9e89f4bc1d99fda035d004519f0ef3da0cf351f4.exermass.exedescription pid Process procid_target PID 3892 wrote to memory of 3580 3892 bbac3dbdce8189c0f682845f9e89f4bc1d99fda035d004519f0ef3da0cf351f4.exe 83 PID 3892 wrote to memory of 3580 3892 bbac3dbdce8189c0f682845f9e89f4bc1d99fda035d004519f0ef3da0cf351f4.exe 83 PID 3892 wrote to memory of 3580 3892 bbac3dbdce8189c0f682845f9e89f4bc1d99fda035d004519f0ef3da0cf351f4.exe 83 PID 3580 wrote to memory of 4672 3580 rmass.exe 84 PID 3580 wrote to memory of 4672 3580 rmass.exe 84 PID 3580 wrote to memory of 4672 3580 rmass.exe 84 PID 3580 wrote to memory of 612 3580 rmass.exe 5 PID 3580 wrote to memory of 3520 3580 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:3520
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C:\Users\Admin\AppData\Local\Temp\bbac3dbdce8189c0f682845f9e89f4bc1d99fda035d004519f0ef3da0cf351f4.exe"C:\Users\Admin\AppData\Local\Temp\bbac3dbdce8189c0f682845f9e89f4bc1d99fda035d004519f0ef3da0cf351f4.exe"2⤵
- Drops file in System32 directory
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3892 -
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
- 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:3580 -
C:\Windows\SysWOW64\rmass.exe--k33p4⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
PID:4672
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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
MD545341ff50ac8546cda773e2601d176e0
SHA15908991090540ccce6ebfced1ef7b93e326a03d3
SHA2564dfc0cb4392d89bb9078a3e033921ee94986b3e5fd10129063829862c1a2210b
SHA512fd985a50d68607b4eb3eaef37f637069fff506b8ef982df9920e537f732064215afdcd1a860330d72e177db6d20e06dd8ca120da8d0fe4307e273fd80531040b
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Filesize
66KB
MD597e3ca47af3fadc36029d34669acb46e
SHA13de5035be3d34143cfffe9f59e05ae041db1e2cb
SHA25645da11d29fe6cadc7a82c63e119646e0129b7d508bb9162a727c23ea31aa23a0
SHA512d02787ae0eaa4cbc48b78ccfc045f492b79ccd838e496bdeef16c7fec358951b71bf67191cf44db3116d64a5f7ed073a974931bdb48fb132e2411c7bf5a2c266
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Filesize
63KB
MD59166bbe6b2dbe4282017f49265dd44ca
SHA1ca7f9b36a1e068278bfdf6d89d4703cb1a34d847
SHA256bbac3dbdce8189c0f682845f9e89f4bc1d99fda035d004519f0ef3da0cf351f4
SHA512d026686bb9a1af448f334c6065fafe8be9f19b485ca6c639872cc8a8153e7c7c619770ba5b716232293a75521a104463b64dc0d8d34653c3034055053eba11f1
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Filesize
1KB
MD56f47b62de25d1745e296a06b3f98ed19
SHA1a688bb35a4c8a5cc198985d624a1b5a6ac5b9f6f
SHA25615c7218eb9cef5fa0573db657b15ce3a5f0e0609f1166df8098ca7152df505b4
SHA512dea26fff8060f44bf20fe4fff2ecbacf428727f10c0f5886fb4813e28fce9cbc3d088337c84edd9857b18514c83f1bb1cf0f51518aaecef09f30e921f4d758d7