da5c7f582d1cfdfb11807f82ca401c8b2207e9079ea46bd1b6e163d011843fd3

General

Target

da5c7f582d1cfdfb11807f82ca401c8b2207e9079ea46bd1b6e163d011843fd3.exe
Size

44KB
MD5

3466738a59b6a76f5dd7059760478764
SHA1

1a722af337ea07904be6bf25ac96dbce0ed20f47
SHA256

da5c7f582d1cfdfb11807f82ca401c8b2207e9079ea46bd1b6e163d011843fd3
SHA512

08465ad91792436e624fa970095c00e474562424458205a8a3a70279c559024f66b077b29f2b884ed9c7f50c3aca42a985fbf85febc864f15de6b9dd2f12bbfa
SSDEEP

768:WAUJmQCcmLCXQq6fsKiJYsIkjJVzqsVG5kuGVAQvr9Vu18ys:RUNHFKQbIkHvGkA65p

Score

10^/10

evasion persistence trojan

Malware Config

Signatures

Windows security bypass 2 TTPs 4 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Processes:

rmass.exe

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

Processes:

rmass.exe

description ioc process

File opened for modification C:\Windows\system32\drivers\etc\hosts rmass.exe

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

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

rmass.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4B584950-5043-4b46-4B58-495050434b46}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4B584950-5043-4b46-4B58-495050434b46}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4B584950-5043-4b46-4B58-495050434b46}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4B584950-5043-4b46-4B58-495050434b46}\StubPath = "C:\\Windows\\system32\\ahuy.exe"	rmass.exe

Sets file execution options in registry 2 TTPs 3 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

rmass.exe

description	ioc	process
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
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exe\0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890 = "a"	rmass.exe

Executes dropped EXE 2 IoCs

Processes:

rmass.exermass.exe

pid process

2632 rmass.exe
2108 rmass.exe

pid	process
2632	rmass.exe
2108	rmass.exe

Loads dropped DLL 3 IoCs

Processes:

da5c7f582d1cfdfb11807f82ca401c8b2207e9079ea46bd1b6e163d011843fd3.exermass.exe

pid	process
2200	da5c7f582d1cfdfb11807f82ca401c8b2207e9079ea46bd1b6e163d011843fd3.exe
2200	da5c7f582d1cfdfb11807f82ca401c8b2207e9079ea46bd1b6e163d011843fd3.exe
2632	rmass.exe

Windows security modification 2 TTPs 4 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Processes:

rmass.exe

description	ioc	process
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
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\FirewallDisableNotify = "5120"	rmass.exe

Modifies WinLogon 2 TTPs 5 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

Processes:

rmass.exe

description	ioc	process
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
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\{BC84DF00-BC38-9902-8082-6FCBF2D87A0B}\012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345 = "a"	rmass.exe

Drops file in System32 directory 12 IoCs

Processes:

rmass.exeda5c7f582d1cfdfb11807f82ca401c8b2207e9079ea46bd1b6e163d011843fd3.exe

description	ioc	process
File opened for modification	C:\Windows\SysWOW64\rmass.exe	rmass.exe
File opened for modification	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\aset32.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\idbg32.exe	rmass.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\rmass.exe	da5c7f582d1cfdfb11807f82ca401c8b2207e9079ea46bd1b6e163d011843fd3.exe
File created	C:\Windows\SysWOW64\rmass.exe	da5c7f582d1cfdfb11807f82ca401c8b2207e9079ea46bd1b6e163d011843fd3.exe
File opened for modification	C:\Windows\SysWOW64\ntdbg.exe	rmass.exe
File created	C:\Windows\SysWOW64\ntdbg.exe	rmass.exe

Drops file in Program Files directory 3 IoCs

Processes:

rmass.exe

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

Processes:

rmass.exermass.exe

pid process

2632 rmass.exe
2632 rmass.exe
2632 rmass.exe
2108 rmass.exe

pid	process
2632	rmass.exe
2632	rmass.exe
2632	rmass.exe
2108	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

da5c7f582d1cfdfb11807f82ca401c8b2207e9079ea46bd1b6e163d011843fd3.exermass.exe

description	pid	process
Token: SeDebugPrivilege	2200	da5c7f582d1cfdfb11807f82ca401c8b2207e9079ea46bd1b6e163d011843fd3.exe
Token: SeDebugPrivilege	2632	rmass.exe

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

da5c7f582d1cfdfb11807f82ca401c8b2207e9079ea46bd1b6e163d011843fd3.exermass.exe

description	pid	process	target process
PID 2200 wrote to memory of 2632	2200	da5c7f582d1cfdfb11807f82ca401c8b2207e9079ea46bd1b6e163d011843fd3.exe	rmass.exe
PID 2200 wrote to memory of 2632	2200	da5c7f582d1cfdfb11807f82ca401c8b2207e9079ea46bd1b6e163d011843fd3.exe	rmass.exe
PID 2200 wrote to memory of 2632	2200	da5c7f582d1cfdfb11807f82ca401c8b2207e9079ea46bd1b6e163d011843fd3.exe	rmass.exe
PID 2200 wrote to memory of 2632	2200	da5c7f582d1cfdfb11807f82ca401c8b2207e9079ea46bd1b6e163d011843fd3.exe	rmass.exe
PID 2632 wrote to memory of 424	2632	rmass.exe	winlogon.exe
PID 2632 wrote to memory of 2108	2632	rmass.exe	rmass.exe
PID 2632 wrote to memory of 2108	2632	rmass.exe	rmass.exe
PID 2632 wrote to memory of 2108	2632	rmass.exe	rmass.exe
PID 2632 wrote to memory of 2108	2632	rmass.exe	rmass.exe
PID 2632 wrote to memory of 1260	2632	rmass.exe	Explorer.EXE

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:424

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:1260

C:\Users\Admin\AppData\Local\Temp\da5c7f582d1cfdfb11807f82ca401c8b2207e9079ea46bd1b6e163d011843fd3.exe
"C:\Users\Admin\AppData\Local\Temp\da5c7f582d1cfdfb11807f82ca401c8b2207e9079ea46bd1b6e163d011843fd3.exe"
2⤵
- Loads dropped DLL
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2200

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:2632

C:\Windows\SysWOW64\rmass.exe
--k33p
4⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
PID:2108

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

3

T1547

Registry Run Keys / Startup Folder

2

T1547.001

Winlogon Helper DLL

1

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

3

T1547

Registry Run Keys / Startup Folder

2

T1547.001

Winlogon Helper DLL

1

T1547.004

Defense Evasion

Impair Defenses

2

T1562

Disable or Modify Tools

Modify Registry

Credential Access

Discovery

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Replay Monitor

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Downloads

C:\Windows\SysWOW64\RECOVER32.DLL
Filesize
5KB

MD5
2b2c28a7a01f9584fe220ef84003427f

SHA1
5fc023df0b5064045eb8de7f2dbe26f07f6fec70

SHA256
9e00af53b1d0c0f5270d94a666d95aa7b4dcb9fea49487c210c055c9dcfcc9eb

SHA512
39192a8a91dec1abff25af8dac0cf39da4dfd51b3fb4f1ef0b4e776185d4280fbe8387c2ea778da7bbf2ce288b0bce4d23cbe8d9e87bbd250159044f5adbac78

Download Submit
C:\Windows\SysWOW64\ahuy.exe
Filesize
46KB

MD5
3c7bd809b77064f33480b43bb11cdfe2

SHA1
8e53a4e267cf921c5863a9301340bca1d65fad96

SHA256
bb90c488b56088841db1b1edff262386cfbaeffa9061be2a24198dda147a6cb6

SHA512
a89e6e6c65120036fdb405be4ed6dc0c179fc358d63c2840752490a1ad90a270ad2280794a43ba884e53fe211df462f670a2bfe0dd0757d7584d763d223bea1d

Download Submit
C:\Windows\SysWOW64\ntdbg.exe
Filesize
47KB

MD5
1d107e180340156d30a1e11d941a8742

SHA1
fb533f4cf5e055f5975c4e6275f89b7446e00aab

SHA256
a74db0d8f022141ae74e794c5bb8ee799d807db4ecbbaf3bb37008df363739cc

SHA512
0032847f383f993d9f1a8c4e1006a451bd58fa224a27a6bc7db598380079359a9aa5a59bc7f30c85d8ef8ea85901f93ada3865beb23d7f2cb1d43342ebba28d0

Download Submit
C:\Windows\System32\drivers\etc\hosts
Filesize
1KB

MD5
b10b13206b0f2cf3968050072f6979bf

SHA1
699db21ba9cecf3f13ac3d76e22cfa41aa94da80

SHA256
0eef3217095cb97b695c434e74d6314bf9e869a013d6e9c88e58c34576a276b4

SHA512
d33bfd931be6676539507a69101d99fa4c5ef36b12422bd11f063b9b6a47b7444f6c4ad5f35e044714fdb872e96cd9fddf049e8329af1219483887f6ac5f4a5d

Download Submit
\Windows\SysWOW64\rmass.exe
Filesize
44KB

MD5
3466738a59b6a76f5dd7059760478764

SHA1
1a722af337ea07904be6bf25ac96dbce0ed20f47

SHA256
da5c7f582d1cfdfb11807f82ca401c8b2207e9079ea46bd1b6e163d011843fd3

SHA512
08465ad91792436e624fa970095c00e474562424458205a8a3a70279c559024f66b077b29f2b884ed9c7f50c3aca42a985fbf85febc864f15de6b9dd2f12bbfa

Download Submit
memory/2108-53-0x0000000000400000-0x000000000040E000-memory.dmp

Filesize
56KB

Download
memory/2200-9-0x0000000000400000-0x000000000040E000-memory.dmp

Filesize
56KB

Download
memory/2632-52-0x0000000000400000-0x000000000040E000-memory.dmp

Filesize
56KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v13

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Downloads