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Analysis
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max time kernel
119s -
max time network
17s -
platform
windows7_x64 -
resource
win7-20240708-en -
resource tags
arch:x64arch:x86image:win7-20240708-enlocale:en-usos:windows7-x64system -
submitted
14/07/2024, 22:15
Static task
static1
Behavioral task
behavioral1
Sample
2ef8d4c32bf741fe4e44576b2e9a5020N.exe
Resource
win7-20240708-en
Behavioral task
behavioral2
Sample
2ef8d4c32bf741fe4e44576b2e9a5020N.exe
Resource
win10v2004-20240709-en
General
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Target
2ef8d4c32bf741fe4e44576b2e9a5020N.exe
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Size
23KB
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MD5
2ef8d4c32bf741fe4e44576b2e9a5020
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SHA1
6dc03a40a9251ccc48b9c55f5a7af9097eb5d18a
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SHA256
8def991589279e0d4169042e93b79ddce953443012fbd1c572d03efb2da56d75
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SHA512
d04530a1e30b0f1b40a4717d7770749f0237bee2ea7e423b2a9c327f0880570b3040038a05934c493ea0818f4cf7cbe077fa79c3a8a3728cbf0a477c9f51f796
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SSDEEP
384:jIz4ClC0Y2i/WqBfroAmbpXhA7qNHh9Ro7Eh6SjUbmc0FGc+RPV8A/L51qsLVn4:jIUGC0YPBfro7AuNHlogs5bmjMd8g5wp
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 -
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.
description ioc Process Key created \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4E4E594A-5a41-4850-4E4E-594A5A414850} rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4E4E594A-5a41-4850-4E4E-594A5A414850}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a" rmass.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4E4E594A-5a41-4850-4E4E-594A5A414850}\IsInstalled = "1" rmass.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4E4E594A-5a41-4850-4E4E-594A5A414850}\StubPath = "C:\\Windows\\system32\\ahuy.exe" rmass.exe -
Drops file in Drivers directory 1 IoCs
description 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
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 2172 rmass.exe 2716 rmass.exe -
Loads dropped DLL 3 IoCs
pid Process 1780 2ef8d4c32bf741fe4e44576b2e9a5020N.exe 1780 2ef8d4c32bf741fe4e44576b2e9a5020N.exe 2172 rmass.exe -
resource yara_rule behavioral1/files/0x000b00000001225f-1.dat upx behavioral1/memory/2172-9-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral1/memory/2716-22-0x0000000000400000-0x0000000000411000-memory.dmp upx behavioral1/memory/2172-56-0x0000000000400000-0x0000000000411000-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\idbg32.exe rmass.exe File opened for modification C:\Windows\SysWOW64\rmass.exe 2ef8d4c32bf741fe4e44576b2e9a5020N.exe File created C:\Windows\SysWOW64\rmass.exe 2ef8d4c32bf741fe4e44576b2e9a5020N.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\RECOVER32.DLL rmass.exe File created C:\Windows\SysWOW64\RECOVER32.DLL rmass.exe File opened for modification C:\Windows\SysWOW64\aset32.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\winrnt.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\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 -
Suspicious behavior: EnumeratesProcesses 4 IoCs
pid Process 2172 rmass.exe 2172 rmass.exe 2172 rmass.exe 2716 rmass.exe -
Suspicious use of AdjustPrivilegeToken 1 IoCs
description pid Process Token: SeDebugPrivilege 2172 rmass.exe -
Suspicious use of WriteProcessMemory 10 IoCs
description pid Process procid_target PID 1780 wrote to memory of 2172 1780 2ef8d4c32bf741fe4e44576b2e9a5020N.exe 31 PID 1780 wrote to memory of 2172 1780 2ef8d4c32bf741fe4e44576b2e9a5020N.exe 31 PID 1780 wrote to memory of 2172 1780 2ef8d4c32bf741fe4e44576b2e9a5020N.exe 31 PID 1780 wrote to memory of 2172 1780 2ef8d4c32bf741fe4e44576b2e9a5020N.exe 31 PID 2172 wrote to memory of 432 2172 rmass.exe 5 PID 2172 wrote to memory of 1124 2172 rmass.exe 20 PID 2172 wrote to memory of 2716 2172 rmass.exe 32 PID 2172 wrote to memory of 2716 2172 rmass.exe 32 PID 2172 wrote to memory of 2716 2172 rmass.exe 32 PID 2172 wrote to memory of 2716 2172 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:1124
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C:\Users\Admin\AppData\Local\Temp\2ef8d4c32bf741fe4e44576b2e9a5020N.exe"C:\Users\Admin\AppData\Local\Temp\2ef8d4c32bf741fe4e44576b2e9a5020N.exe"2⤵
- Loads dropped DLL
- Drops file in System32 directory
- Suspicious use of WriteProcessMemory
PID:1780 -
C:\Windows\SysWOW64\rmass.exe"C:\Windows\SysWOW64\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
- 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:2172 -
C:\Windows\SysWOW64\rmass.exe--k33p4⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
PID:2716
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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
1Replay Monitor
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Downloads
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Filesize
5KB
MD52b2c28a7a01f9584fe220ef84003427f
SHA15fc023df0b5064045eb8de7f2dbe26f07f6fec70
SHA2569e00af53b1d0c0f5270d94a666d95aa7b4dcb9fea49487c210c055c9dcfcc9eb
SHA51239192a8a91dec1abff25af8dac0cf39da4dfd51b3fb4f1ef0b4e776185d4280fbe8387c2ea778da7bbf2ce288b0bce4d23cbe8d9e87bbd250159044f5adbac78
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Filesize
23KB
MD51bc343a74626c14a6aa79d0afba47d33
SHA1068857862b2f8108a4795012cff6243388fdd646
SHA2560fb122210ce25a4d8d0c0e48418ec2dac6e11f62dfa5f186e2a197bb742782b5
SHA51218362c326669a7c135d499bae99011e75335615d6be9f55fe1ed0c4e76c402794e03ba030663da83f637512de47e15ca2f3d7bfa247ad1f24a724299c56c6f9e
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Filesize
24KB
MD5b9e96bd1b4e34967ac70285946e09e1f
SHA1f946960bbbd7ddb8f25b81d733601a8a195f8774
SHA256fe50a5ba18ae45e61e009533ee47011bb66bdcf556c0612f4e3b6ab1065966e2
SHA5129c9fd000b15d3f043b0d09c62e368a4aef50c91e1de9f100dbe2095cf015fb55674ea5ed1511f8b6654ecfe2a933420068102c465ec7c67539cc30c7863559ff
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Filesize
21KB
MD599eb92427751484be0ae1f8bcd5b6f5a
SHA1592f096d672f121d2669419b0893a6b758189f31
SHA2561d2585db65cd8d9eaca0e604f8c1db92793d624335e13bbe437411b710a1cfae
SHA5120fd0d4f850d81231747c381ac30bd02be07d0ce11f6beb675953e120aea86949a99796eac2f10427ff7526fd4f1d90dd4a8acc943295259482cc6ec415011527