Analysis
- max time kernel
149s - max time network
150s - platform
windows10-2004_x64 - resource
win10v2004-20240508-en - resource tags
arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system - submitted
14/06/2024, 00:22
Behavioral task
behavioral1
Sample
78c497a8132fc2de85cee8fdf5b2284a88f239a1591b823e46061ed9c9af8013.exe
Resource
win7-20240611-en
windows7-x64
14 signatures
150 seconds
Behavioral task
behavioral2
Sample
78c497a8132fc2de85cee8fdf5b2284a88f239a1591b823e46061ed9c9af8013.exe
Resource
win10v2004-20240508-en
windows10-2004-x64
13 signatures
150 seconds
General
- Target 78c497a8132fc2de85cee8fdf5b2284a88f239a1591b823e46061ed9c9af8013.exe
- Size 20KB
- Sample240614-an2lpaxdnb
- SHA256 78c497a8132fc2de85cee8fdf5b2284a88f239a1591b823e46061ed9c9af8013
- MD5 b13d6880cb96292f9fa65e69e9f4fdd0
- SHA1 e6367d52eeb3c65f3fd6fcc1789ce7cf45fb253f
- SHA512 0083a5fc063e33ea76e660a6c76cbfe86762dfddd725ddd91f25af6004ed535a03adfd1c78119a786221884911fe5e2f195352633c4e8f6b78b5ea6dbf69228e
- SSDEEP 384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvXwLDF:rRkiLw3HsDSARGG/ALDF
- MD5 SHA1 SHA512 SSDEEP
Score
10/10
Malware Config
Signatures
-
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 Key created \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{47534147-4d48-4351-4753-41474D484351} rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{47534147-4d48-4351-4753-41474D484351}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a" rmass.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{47534147-4d48-4351-4753-41474D484351}\IsInstalled = "1" rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{47534147-4d48-4351-4753-41474D484351}\StubPath = "C:\\Windows\\system32\\ahuy.exe" rmass.exe - Sets file execution options in registry 2 TTPs 3 IoCs
description 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
pid Process 3656 rmass.exe 3924 rmass.exe -
resource yara_rule behavioral2/memory/2660-0-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral2/files/0x000a0000000233d8-8.dat upx behavioral2/memory/2660-7-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral2/memory/3656-9-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral2/memory/3924-19-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral2/memory/3656-53-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral2/memory/3924-54-0x0000000000400000-0x0000000000411000-memory.dmp upx -
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 - Modifies WinLogon 2 TTPs 5 IoCs
description ioc Process 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 Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\{BC84DF00-BC38-9902-8082-6FCBF2D87A0B}\Startup = "Startup" rmass.exe - Drops file in System32 directory 12 IoCs
description ioc Process File created C:\Windows\SysWOW64\ahuy.exe rmass.exe File opened for modification C:\Windows\SysWOW64\aset32.exe rmass.exe File created 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 78c497a8132fc2de85cee8fdf5b2284a88f239a1591b823e46061ed9c9af8013.exe File created C:\Windows\SysWOW64\rmass.exe 78c497a8132fc2de85cee8fdf5b2284a88f239a1591b823e46061ed9c9af8013.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\RECOVER32.DLL rmass.exe File opened for modification C:\Windows\SysWOW64\idbg32.exe rmass.exe File opened for modification C:\Windows\SysWOW64\rmass.exe 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 3656 rmass.exe 3656 rmass.exe 3656 rmass.exe 3656 rmass.exe 3656 rmass.exe 3656 rmass.exe 3924 rmass.exe 3924 rmass.exe - Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 2660 78c497a8132fc2de85cee8fdf5b2284a88f239a1591b823e46061ed9c9af8013.exe Token: SeDebugPrivilege 3656 rmass.exe - Suspicious use of WriteProcessMemory 8 IoCs
description pid Process procid_target PID 2660 wrote to memory of 3656 2660 78c497a8132fc2de85cee8fdf5b2284a88f239a1591b823e46061ed9c9af8013.exe 80 PID 2660 wrote to memory of 3656 2660 78c497a8132fc2de85cee8fdf5b2284a88f239a1591b823e46061ed9c9af8013.exe 80 PID 2660 wrote to memory of 3656 2660 78c497a8132fc2de85cee8fdf5b2284a88f239a1591b823e46061ed9c9af8013.exe 80 PID 3656 wrote to memory of 616 3656 rmass.exe 5 PID 3656 wrote to memory of 3448 3656 rmass.exe 56 PID 3656 wrote to memory of 3924 3656 rmass.exe 81 PID 3656 wrote to memory of 3924 3656 rmass.exe 81 PID 3656 wrote to memory of 3924 3656 rmass.exe 81
Processes
-
C:\Windows\system32\winlogon.exewinlogon.exe1⤵PID:616
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C:\Windows\Explorer.EXEC:\Windows\Explorer.EXE1⤵PID:3448
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C:\Users\Admin\AppData\Local\Temp\78c497a8132fc2de85cee8fdf5b2284a88f239a1591b823e46061ed9c9af8013.exe"C:\Users\Admin\AppData\Local\Temp\78c497a8132fc2de85cee8fdf5b2284a88f239a1591b823e46061ed9c9af8013.exe"2⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2660 -
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:3656 -
C:\Windows\SysWOW64\rmass.exe--k33p4⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
PID:3924
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
- Path C:\Windows\SysWOW64\RECOVER32.DLL
- Size 5KB
- SHA256 9e00af53b1d0c0f5270d94a666d95aa7b4dcb9fea49487c210c055c9dcfcc9eb
- MD5 2b2c28a7a01f9584fe220ef84003427f
- SHA1 5fc023df0b5064045eb8de7f2dbe26f07f6fec70
- SHA512 39192a8a91dec1abff25af8dac0cf39da4dfd51b3fb4f1ef0b4e776185d4280fbe8387c2ea778da7bbf2ce288b0bce4d23cbe8d9e87bbd250159044f5adbac78
- SSDEEP 48:6CsrGV5e2/WJbm73k2vZcsrkqSq2cxc2G5ZwJOFl:SqV5Roa73kQ/kqqAD
- MD5 SHA1 SHA512 SSDEEP
- Path C:\Windows\SysWOW64\ahuy.exe
- Size 22KB
- SHA256 6d37b5bfbcc3d26e4be8d0506b1d7dd0d406ebdb2283cf8310a61683e17cbdc9
- MD5 61516eeae413c7d41e6ba17c7719d2da
- SHA1 9f6d37c1aaa63e80fb328dea5d672ad43524b6e7
- SHA512 54afd90648b30bab46a52b47c4862f8e0f2990ab18821cebc72a2a3c2b527ba118a0b237df85d3855a7e681113639eaf39306de950b851015873860aebf8afe3
- SSDEEP 384:jIz4SkqXwgv/GVxtl57lci68YroDXGWPfHVK7sRdI+iJXGqIrltGh66IcrO7HG8J:jIUSkqpvuVxv5CizTzGWn1KQR2dsq6lx
- MD5 SHA1 SHA512 SSDEEP
- Path C:\Windows\SysWOW64\ntdbg.exe
- Size 23KB
- SHA256 0ef1e6a49a844ad23efc2a3b400867d1c02632f943ae145b247700774839f1c2
- MD5 0e95dd237a0414f64bada72b9338bbff
- SHA1 cd7251da1538a9a5c8ba67544299b6de9143df61
- SHA512 9159838210322fcddcb5aafc6d1c0d622ca0fce61cf046f53afae2ed1e5eb39b5c35c7b2947b6b27986a4f10aaa3bf65b36471d3925c1d39270641f951b26444
- SSDEEP 384:ErzP7wr2qnYysUaR+VX1BttEQwlh9vc0mE+0:Erz7wrHbVlBYh5cb0
- MD5 SHA1 SHA512 SSDEEP
- Path C:\Windows\SysWOW64\rmass.exe
- Size 20KB
- SHA256 78c497a8132fc2de85cee8fdf5b2284a88f239a1591b823e46061ed9c9af8013
- MD5 b13d6880cb96292f9fa65e69e9f4fdd0
- SHA1 e6367d52eeb3c65f3fd6fcc1789ce7cf45fb253f
- SHA512 0083a5fc063e33ea76e660a6c76cbfe86762dfddd725ddd91f25af6004ed535a03adfd1c78119a786221884911fe5e2f195352633c4e8f6b78b5ea6dbf69228e
- SSDEEP 384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvXwLDF:rRkiLw3HsDSARGG/ALDF
- MD5 SHA1 SHA512 SSDEEP
- Path C:\Windows\System32\drivers\etc\hosts
- Size 1KB
- SHA256 15c7218eb9cef5fa0573db657b15ce3a5f0e0609f1166df8098ca7152df505b4
- MD5 6f47b62de25d1745e296a06b3f98ed19
- SHA1 a688bb35a4c8a5cc198985d624a1b5a6ac5b9f6f
- SHA512 dea26fff8060f44bf20fe4fff2ecbacf428727f10c0f5886fb4813e28fce9cbc3d088337c84edd9857b18514c83f1bb1cf0f51518aaecef09f30e921f4d758d7
- MD5 SHA1 SHA512