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Analysis
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max time kernel
149s -
max time network
154s -
platform
windows10-2004_x64 -
resource
win10v2004-20240426-en -
resource tags
arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system -
submitted
08/05/2024, 23:40
Behavioral task
behavioral1
Sample
6a96053a428452d0e03f2462b16265816c5b37042a81205812d6ea412f916ed6.exe
Resource
win7-20240508-en
Behavioral task
behavioral2
Sample
6a96053a428452d0e03f2462b16265816c5b37042a81205812d6ea412f916ed6.exe
Resource
win10v2004-20240426-en
General
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Target
6a96053a428452d0e03f2462b16265816c5b37042a81205812d6ea412f916ed6.exe
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Size
21KB
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MD5
a09d4a606443ecbee935532ae68954f0
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SHA1
8a551e63708d2e0855d07b1b7c3e1c543ba0141a
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SHA256
6a96053a428452d0e03f2462b16265816c5b37042a81205812d6ea412f916ed6
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SHA512
3990709f2ff65d10ffdf60ad4a1f09fda9154d49f849988a6adc608af81762d22d32498c7dcca3811478c8e12b75200a2d27c67c2ddf0f532427c8f2b3e6455c
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SSDEEP
384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvX8Mb7a67:rRkiLw3HsDSARGG/MMb7r7
Malware Config
Signatures
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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 -
Drops file in Drivers directory 1 IoCs
description ioc Process File opened for modification C:\Windows\system32\drivers\etc\hosts rmass.exe -
Modifies Installed Components in the registry 2 TTPs 4 IoCs
description ioc Process Set value (int) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4E515054-544d-524d-4E51-5054544D524d}\IsInstalled = "1" rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4E515054-544d-524d-4E51-5054544D524d}\StubPath = "C:\\Windows\\system32\\ahuy.exe" rmass.exe Key created \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4E515054-544d-524d-4E51-5054544D524d} rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4E515054-544d-524d-4E51-5054544D524d}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a" rmass.exe -
Sets file execution options in registry 2 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 2420 rmass.exe 2904 rmass.exe -
resource yara_rule behavioral2/memory/1020-0-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral2/memory/1020-8-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral2/memory/2904-18-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral2/files/0x0007000000023298-11.dat upx behavioral2/memory/2420-52-0x0000000000400000-0x0000000000411000-memory.dmp upx -
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 -
Modifies WinLogon 2 TTPs 5 IoCs
description ioc Process 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 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 -
Drops file in System32 directory 12 IoCs
description ioc Process File created C:\Windows\SysWOW64\rmass.exe 6a96053a428452d0e03f2462b16265816c5b37042a81205812d6ea412f916ed6.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 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 6a96053a428452d0e03f2462b16265816c5b37042a81205812d6ea412f916ed6.exe File opened for modification C:\Windows\SysWOW64\idbg32.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 created C:\Windows\SysWOW64\RECOVER32.DLL rmass.exe -
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 -
Suspicious behavior: EnumeratesProcesses 8 IoCs
pid Process 2420 rmass.exe 2420 rmass.exe 2420 rmass.exe 2420 rmass.exe 2420 rmass.exe 2420 rmass.exe 2904 rmass.exe 2904 rmass.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 1020 6a96053a428452d0e03f2462b16265816c5b37042a81205812d6ea412f916ed6.exe Token: SeDebugPrivilege 2420 rmass.exe -
Suspicious use of WriteProcessMemory 8 IoCs
description pid Process procid_target PID 1020 wrote to memory of 2420 1020 6a96053a428452d0e03f2462b16265816c5b37042a81205812d6ea412f916ed6.exe 83 PID 1020 wrote to memory of 2420 1020 6a96053a428452d0e03f2462b16265816c5b37042a81205812d6ea412f916ed6.exe 83 PID 1020 wrote to memory of 2420 1020 6a96053a428452d0e03f2462b16265816c5b37042a81205812d6ea412f916ed6.exe 83 PID 2420 wrote to memory of 2904 2420 rmass.exe 84 PID 2420 wrote to memory of 2904 2420 rmass.exe 84 PID 2420 wrote to memory of 2904 2420 rmass.exe 84 PID 2420 wrote to memory of 612 2420 rmass.exe 5 PID 2420 wrote to memory of 3524 2420 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:3524
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C:\Users\Admin\AppData\Local\Temp\6a96053a428452d0e03f2462b16265816c5b37042a81205812d6ea412f916ed6.exe"C:\Users\Admin\AppData\Local\Temp\6a96053a428452d0e03f2462b16265816c5b37042a81205812d6ea412f916ed6.exe"2⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1020 -
C:\Windows\SysWOW64\rmass.exe"C:\Windows\system32\rmass.exe"3⤵
- Windows security bypass
- Drops file in Drivers directory
- Modifies Installed Components in the registry
- Sets file execution options in registry
- Executes dropped EXE
- Windows security modification
- Modifies WinLogon
- Drops file in System32 directory
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2420 -
C:\Windows\SysWOW64\rmass.exe--k33p4⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
PID:2904
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
5KB
MD52b2c28a7a01f9584fe220ef84003427f
SHA15fc023df0b5064045eb8de7f2dbe26f07f6fec70
SHA2569e00af53b1d0c0f5270d94a666d95aa7b4dcb9fea49487c210c055c9dcfcc9eb
SHA51239192a8a91dec1abff25af8dac0cf39da4dfd51b3fb4f1ef0b4e776185d4280fbe8387c2ea778da7bbf2ce288b0bce4d23cbe8d9e87bbd250159044f5adbac78
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Filesize
23KB
MD55833665c070def10bdc4bed46e669b16
SHA13078e263107f50491e3419a040f491324148aba5
SHA25687131a28a61d69211061c5e94f28f5d01619e893995732bd6b1ac8544cdfea08
SHA51218cc1e3690b348c2baf739f02a401792fc7fc9694d7a5f272e2c1ae6f0a05701a58b318eb33aa5276c239a8624e90882fc86bfd54b04cc8b2495183dcf71387e
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Filesize
24KB
MD5ca642ed6a057bc96fec5c2029cce2733
SHA183ce924a92c32413b223dedea126d735a9a93b03
SHA256082342a86afa84f682f717ad88bb58a019e31c7c31082a889c913f3e657cd5a0
SHA5128780dee5a91bc28fc08353bd7e48a2d9a0a4971be51697c50b861c4ac94b6948746964d4a87f00577ba5d2cd244ac136dce0ccd1239295457126e869833f180b
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Filesize
21KB
MD5a09d4a606443ecbee935532ae68954f0
SHA18a551e63708d2e0855d07b1b7c3e1c543ba0141a
SHA2566a96053a428452d0e03f2462b16265816c5b37042a81205812d6ea412f916ed6
SHA5123990709f2ff65d10ffdf60ad4a1f09fda9154d49f849988a6adc608af81762d22d32498c7dcca3811478c8e12b75200a2d27c67c2ddf0f532427c8f2b3e6455c
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Filesize
1KB
MD56f47b62de25d1745e296a06b3f98ed19
SHA1a688bb35a4c8a5cc198985d624a1b5a6ac5b9f6f
SHA25615c7218eb9cef5fa0573db657b15ce3a5f0e0609f1166df8098ca7152df505b4
SHA512dea26fff8060f44bf20fe4fff2ecbacf428727f10c0f5886fb4813e28fce9cbc3d088337c84edd9857b18514c83f1bb1cf0f51518aaecef09f30e921f4d758d7