3bd80422de8732c1bfe554418c15bcf728532d23af9f4a1d0076985711740510

General

Target

3bd80422de8732c1bfe554418c15bcf728532d23af9f4a1d0076985711740510.exe
Size

44KB
MD5

9cc293fe2fc1b5592495b7b66ab15532
SHA1

49f27d6f0c67434d3d0b05fdc56e571015fec925
SHA256

3bd80422de8732c1bfe554418c15bcf728532d23af9f4a1d0076985711740510
SHA512

5a412e96fdcafcb893de4e5655325d2b521761d4746c9cfd0b459afeeff4f26219ab2dd1a0d870357fec8eb11712b40c756b58cbaae0aedb1556c6855d0f78d8
SSDEEP

768:WAUJmQCcmLCXQq6fsKiJYsIkjJVzqsVG5kuGVAQv/+G:RUNHFKQbIkHvGkAu+G

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\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
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusOverride = "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\{4256524B-4950-5453-4256-524B49505453}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4256524B-4950-5453-4256-524B49505453}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4256524B-4950-5453-4256-524B49505453}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4256524B-4950-5453-4256-524B49505453}\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
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

Processes:

rmass.exermass.exe

pid process

2360 rmass.exe
2304 rmass.exe

pid	process
2360	rmass.exe
2304	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\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

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:

3bd80422de8732c1bfe554418c15bcf728532d23af9f4a1d0076985711740510.exermass.exe

description	ioc	process
File opened for modification	C:\Windows\SysWOW64\rmass.exe	3bd80422de8732c1bfe554418c15bcf728532d23af9f4a1d0076985711740510.exe
File created	C:\Windows\SysWOW64\rmass.exe	3bd80422de8732c1bfe554418c15bcf728532d23af9f4a1d0076985711740510.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\rmass.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\ntdbg.exe	rmass.exe
File created	C:\Windows\SysWOW64\ntdbg.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\aset32.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\idbg32.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 8 IoCs

Processes:

rmass.exermass.exe

pid process

2360 rmass.exe
2360 rmass.exe
2360 rmass.exe
2360 rmass.exe
2360 rmass.exe
2360 rmass.exe
2304 rmass.exe
2304 rmass.exe

pid	process
2360	rmass.exe
2360	rmass.exe
2360	rmass.exe
2360	rmass.exe
2360	rmass.exe
2360	rmass.exe
2304	rmass.exe
2304	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

3bd80422de8732c1bfe554418c15bcf728532d23af9f4a1d0076985711740510.exermass.exe

description	pid	process
Token: SeDebugPrivilege	3884	3bd80422de8732c1bfe554418c15bcf728532d23af9f4a1d0076985711740510.exe
Token: SeDebugPrivilege	2360	rmass.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

3bd80422de8732c1bfe554418c15bcf728532d23af9f4a1d0076985711740510.exermass.exe

description	pid	process	target process
PID 3884 wrote to memory of 2360	3884	3bd80422de8732c1bfe554418c15bcf728532d23af9f4a1d0076985711740510.exe	rmass.exe
PID 3884 wrote to memory of 2360	3884	3bd80422de8732c1bfe554418c15bcf728532d23af9f4a1d0076985711740510.exe	rmass.exe
PID 3884 wrote to memory of 2360	3884	3bd80422de8732c1bfe554418c15bcf728532d23af9f4a1d0076985711740510.exe	rmass.exe
PID 2360 wrote to memory of 620	2360	rmass.exe	winlogon.exe
PID 2360 wrote to memory of 3484	2360	rmass.exe	Explorer.EXE
PID 2360 wrote to memory of 2304	2360	rmass.exe	rmass.exe
PID 2360 wrote to memory of 2304	2360	rmass.exe	rmass.exe
PID 2360 wrote to memory of 2304	2360	rmass.exe	rmass.exe

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:620

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:3484

C:\Users\Admin\AppData\Local\Temp\3bd80422de8732c1bfe554418c15bcf728532d23af9f4a1d0076985711740510.exe
"C:\Users\Admin\AppData\Local\Temp\3bd80422de8732c1bfe554418c15bcf728532d23af9f4a1d0076985711740510.exe"
2⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3884

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:2360

C:\Windows\SysWOW64\rmass.exe
--k33p
4⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
PID:2304

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

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

Command and Control

Exfiltration

Impact

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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
b91bb5dec67f4b44e5aa665eed0a615d

SHA1
075da9db3946d83c272b6544a6bd898cb96b4f5b

SHA256
17bc93ecf4b2db66dda6764610f0f5d7e274bc6cfcd11ed073cacfe4e3511a6d

SHA512
9707bd347f678e1d93457fbc12709ac62e28108e580897541fbc6f737d4e2f19fa3fb619ace0a3be41b2d10679c419a6bd8a69aa485e1da3334f06cf3a7d5b49

Download Submit
C:\Windows\SysWOW64\ntdbg.exe

Filesize
47KB

MD5
19c3d8d19e54c9c45d598ffda2ca82b2

SHA1
e38e510a97225ebb1bc432daf83b36c92202ca70

SHA256
281f3b42e85272b1e3d28c96e6ab3a13c31f916130d7a4e29d18a70db4ed6af8

SHA512
87bf1fbf03432c0b2a91aca4c41bdd206b7bf073b3d893683f1f009cec855bfec076fb69d0de8151bb3b27c3b7619a7a8eb7f49877f0e1a669fb881b3aa19735

Download Submit
C:\Windows\SysWOW64\rmass.exe

Filesize
44KB

MD5
9cc293fe2fc1b5592495b7b66ab15532

SHA1
49f27d6f0c67434d3d0b05fdc56e571015fec925

SHA256
3bd80422de8732c1bfe554418c15bcf728532d23af9f4a1d0076985711740510

SHA512
5a412e96fdcafcb893de4e5655325d2b521761d4746c9cfd0b459afeeff4f26219ab2dd1a0d870357fec8eb11712b40c756b58cbaae0aedb1556c6855d0f78d8

Download Submit
C:\Windows\System32\drivers\etc\hosts

Filesize
1KB

MD5
6f47b62de25d1745e296a06b3f98ed19

SHA1
a688bb35a4c8a5cc198985d624a1b5a6ac5b9f6f

SHA256
15c7218eb9cef5fa0573db657b15ce3a5f0e0609f1166df8098ca7152df505b4

SHA512
dea26fff8060f44bf20fe4fff2ecbacf428727f10c0f5886fb4813e28fce9cbc3d088337c84edd9857b18514c83f1bb1cf0f51518aaecef09f30e921f4d758d7

Download Submit
memory/2304-50-0x0000000000400000-0x000000000040E000-memory.dmp

Filesize
56KB

Download
memory/2360-49-0x0000000000400000-0x000000000040E000-memory.dmp

Filesize
56KB

Download
memory/3884-4-0x0000000000400000-0x000000000040E000-memory.dmp

Filesize
56KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads