Analysis
- max time kernel
149s - max time network
123s - platform
windows7_x64 - resource
win7-20240508-en - resource tags
arch:x64arch:x86image:win7-20240508-enlocale:en-usos:windows7-x64system - submitted
14/06/2024, 03:30
Behavioral task
behavioral1
Sample
bec6f351a83c25a950b745e54462846202650fe93d2a1be8b3b99572926458f1.exe
Resource
win7-20240508-en
windows7-x64
14 signatures
150 seconds
Behavioral task
behavioral2
Sample
bec6f351a83c25a950b745e54462846202650fe93d2a1be8b3b99572926458f1.exe
Resource
win10v2004-20240508-en
windows10-2004-x64
13 signatures
150 seconds
General
- Target bec6f351a83c25a950b745e54462846202650fe93d2a1be8b3b99572926458f1.exe
- Size 22KB
- Sample240614-d2n5astdnb
- SHA256 bec6f351a83c25a950b745e54462846202650fe93d2a1be8b3b99572926458f1
- MD5 07ae4f90d95dcc6725eea6abbd0aacac
- SHA1 ac7c6a675e13d179e725ad740222fea821291806
- SHA512 db8fccee73564795aa0cb4aa7f723ea782327aea8e7903054552601a78a58aa105221e231753716592bd34df4efa517f7e0f0b30297efba5e7be88445abe74ed
- SSDEEP 384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvX8Mb7a6cUS:rRkiLw3HsDSARGG/MMb7rU
- MD5 SHA1 SHA512 SSDEEP
Score
10/10
Malware Config
Signatures
-
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 - 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\{55485251-4b4a-4350-5548-52514B4A4350} rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{55485251-4b4a-4350-5548-52514B4A4350}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a" rmass.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{55485251-4b4a-4350-5548-52514B4A4350}\IsInstalled = "1" rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{55485251-4b4a-4350-5548-52514B4A4350}\StubPath = "C:\\Windows\\system32\\ahuy.exe" 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 2376 rmass.exe 1724 rmass.exe - Loads dropped DLL 3 IoCs
pid Process 2908 bec6f351a83c25a950b745e54462846202650fe93d2a1be8b3b99572926458f1.exe 2908 bec6f351a83c25a950b745e54462846202650fe93d2a1be8b3b99572926458f1.exe 2376 rmass.exe -
resource yara_rule behavioral1/memory/2908-0-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral1/memory/2908-5-0x00000000002B0000-0x00000000002C1000-memory.dmp upx behavioral1/files/0x000a00000001227e-4.dat upx behavioral1/memory/2908-12-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral1/memory/2376-14-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral1/memory/2376-59-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral1/memory/1724-60-0x0000000000400000-0x0000000000411000-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 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 Key created \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify rmass.exe - Drops file in System32 directory 12 IoCs
description ioc Process File opened for modification C:\Windows\SysWOW64\rmass.exe bec6f351a83c25a950b745e54462846202650fe93d2a1be8b3b99572926458f1.exe File created C:\Windows\SysWOW64\rmass.exe bec6f351a83c25a950b745e54462846202650fe93d2a1be8b3b99572926458f1.exe File created C:\Windows\SysWOW64\ntdbg.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\aset32.exe rmass.exe File opened for modification C:\Windows\SysWOW64\rmass.exe rmass.exe File opened for modification 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\winrnt.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 4 IoCs
pid Process 2376 rmass.exe 2376 rmass.exe 2376 rmass.exe 1724 rmass.exe - Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 2908 bec6f351a83c25a950b745e54462846202650fe93d2a1be8b3b99572926458f1.exe Token: SeDebugPrivilege 2376 rmass.exe - Suspicious use of WriteProcessMemory 10 IoCs
description pid Process procid_target PID 2908 wrote to memory of 2376 2908 bec6f351a83c25a950b745e54462846202650fe93d2a1be8b3b99572926458f1.exe 28 PID 2908 wrote to memory of 2376 2908 bec6f351a83c25a950b745e54462846202650fe93d2a1be8b3b99572926458f1.exe 28 PID 2908 wrote to memory of 2376 2908 bec6f351a83c25a950b745e54462846202650fe93d2a1be8b3b99572926458f1.exe 28 PID 2908 wrote to memory of 2376 2908 bec6f351a83c25a950b745e54462846202650fe93d2a1be8b3b99572926458f1.exe 28 PID 2376 wrote to memory of 432 2376 rmass.exe 5 PID 2376 wrote to memory of 1204 2376 rmass.exe 21 PID 2376 wrote to memory of 1724 2376 rmass.exe 29 PID 2376 wrote to memory of 1724 2376 rmass.exe 29 PID 2376 wrote to memory of 1724 2376 rmass.exe 29 PID 2376 wrote to memory of 1724 2376 rmass.exe 29
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:1204
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C:\Users\Admin\AppData\Local\Temp\bec6f351a83c25a950b745e54462846202650fe93d2a1be8b3b99572926458f1.exe"C:\Users\Admin\AppData\Local\Temp\bec6f351a83c25a950b745e54462846202650fe93d2a1be8b3b99572926458f1.exe"2⤵
- Loads dropped DLL
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2908 -
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
- Loads dropped DLL
- 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:2376 -
C:\Windows\SysWOW64\rmass.exe--k33p4⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
PID:1724
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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 24KB
- SHA256 e9a51de4ccbae93e194679b00aff236e5bb5a324c8c0d6d8f48c719da727fc27
- MD5 928a2143d683c3ea47adf95f638fcab7
- SHA1 1350ffa8358dd19c6a7a530fa8ba5b3db8f58945
- SHA512 18f607fbc59e2950382f8ecaa4a97d5d0aedea2da3bf2323d6734f692b31f71baedb69f0a08f0a9709de7cd373ce02035cd8036312e4f6cbeaea99ff79614fa7
- SSDEEP 384:jIz4fcpvBzvkATKMX7RYMQjBbfE6iOTaPHLoWLERMGnduNe3vq5E8Fe:jIU6aOXh0bfxiTroWLEYgfEE3
- MD5 SHA1 SHA512 SSDEEP
- Path C:\Windows\SysWOW64\ntdbg.exe
- Size 25KB
- SHA256 08f85577bf948788d25a0bfc05d47257f84eb89f95e9b7e0d2d775d58d85b844
- MD5 d34c0d9076d3a67cd0aaf7a98adebb88
- SHA1 c97bb90bc387337b5b856ea7dbb08f5890c9e390
- SHA512 b181078c243f593f7e3cdb7d26eb91767657d3b537bc44db2807407d7352cc76b5865aec1f8280c81ad4750fe763fb750e22ff350fb36f041861f8811b05a075
- SSDEEP 768:ErzNc47U1TkSKbZ2+lGk2BF8ToR+R7mTb:EVcfwuuz2HnR+Rcb
- MD5 SHA1 SHA512 SSDEEP
- Path C:\Windows\System32\drivers\etc\hosts
- Size 1KB
- SHA256 0eef3217095cb97b695c434e74d6314bf9e869a013d6e9c88e58c34576a276b4
- MD5 b10b13206b0f2cf3968050072f6979bf
- SHA1 699db21ba9cecf3f13ac3d76e22cfa41aa94da80
- SHA512 d33bfd931be6676539507a69101d99fa4c5ef36b12422bd11f063b9b6a47b7444f6c4ad5f35e044714fdb872e96cd9fddf049e8329af1219483887f6ac5f4a5d
- MD5 SHA1 SHA512
- Path \Windows\SysWOW64\rmass.exe
- Size 22KB
- SHA256 bec6f351a83c25a950b745e54462846202650fe93d2a1be8b3b99572926458f1
- MD5 07ae4f90d95dcc6725eea6abbd0aacac
- SHA1 ac7c6a675e13d179e725ad740222fea821291806
- SHA512 db8fccee73564795aa0cb4aa7f723ea782327aea8e7903054552601a78a58aa105221e231753716592bd34df4efa517f7e0f0b30297efba5e7be88445abe74ed
- SSDEEP 384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvX8Mb7a6cUS:rRkiLw3HsDSARGG/MMb7rU
- MD5 SHA1 SHA512 SSDEEP