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\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

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
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
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

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

3316 rmass.exe
1752 rmass.exe

pid	process
3316	rmass.exe
1752	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\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

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}\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
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

Drops file in System32 directory 12 IoCs

Processes:

da5c7f582d1cfdfb11807f82ca401c8b2207e9079ea46bd1b6e163d011843fd3.exermass.exe

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

Suspicious behavior: EnumeratesProcesses 8 IoCs

Processes:

rmass.exermass.exe

pid process

3316 rmass.exe
3316 rmass.exe
3316 rmass.exe
3316 rmass.exe
3316 rmass.exe
3316 rmass.exe
1752 rmass.exe
1752 rmass.exe

pid	process
3316	rmass.exe
3316	rmass.exe
3316	rmass.exe
3316	rmass.exe
3316	rmass.exe
3316	rmass.exe
1752	rmass.exe
1752	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

da5c7f582d1cfdfb11807f82ca401c8b2207e9079ea46bd1b6e163d011843fd3.exermass.exe

description	pid	process
Token: SeDebugPrivilege	940	da5c7f582d1cfdfb11807f82ca401c8b2207e9079ea46bd1b6e163d011843fd3.exe
Token: SeDebugPrivilege	3316	rmass.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

da5c7f582d1cfdfb11807f82ca401c8b2207e9079ea46bd1b6e163d011843fd3.exermass.exe

description	pid	process	target process
PID 940 wrote to memory of 3316	940	da5c7f582d1cfdfb11807f82ca401c8b2207e9079ea46bd1b6e163d011843fd3.exe	rmass.exe
PID 940 wrote to memory of 3316	940	da5c7f582d1cfdfb11807f82ca401c8b2207e9079ea46bd1b6e163d011843fd3.exe	rmass.exe
PID 940 wrote to memory of 3316	940	da5c7f582d1cfdfb11807f82ca401c8b2207e9079ea46bd1b6e163d011843fd3.exe	rmass.exe
PID 3316 wrote to memory of 612	3316	rmass.exe	winlogon.exe
PID 3316 wrote to memory of 3480	3316	rmass.exe	Explorer.EXE
PID 3316 wrote to memory of 1752	3316	rmass.exe	rmass.exe
PID 3316 wrote to memory of 1752	3316	rmass.exe	rmass.exe
PID 3316 wrote to memory of 1752	3316	rmass.exe	rmass.exe

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:612

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:3480

C:\Users\Admin\AppData\Local\Temp\da5c7f582d1cfdfb11807f82ca401c8b2207e9079ea46bd1b6e163d011843fd3.exe
"C:\Users\Admin\AppData\Local\Temp\da5c7f582d1cfdfb11807f82ca401c8b2207e9079ea46bd1b6e163d011843fd3.exe"
2⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:940

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:3316

C:\Windows\SysWOW64\rmass.exe
--k33p
4⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
PID:1752

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

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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
fd9d789f92e7f326371306638ba9152c

SHA1
7bc3435e7175f275e5a855fe5eefc8bdf7e57f0b

SHA256
163610e3968046d63879e0ba259a15a22a889599b6d0b8efb71a0ed4ee89270c

SHA512
13783b66e519c45a30c4c1b687ed350eae97107756661c627d5df6e596c376f02bbec30cd24f57755283e176a00cf2b53553fd86aa3fa9ad50706ca852ba12c0

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

MD5
ac8feddd608e20c40b73ec5dcd2180c1

SHA1
299803230fa4187527e5c2cc51afeeb6561364e5

SHA256
74c25a705975e277efcb64f75a76939bc89ff6638e29b7c4f77f258c8c34866e

SHA512
dd85c5f2bbb43452fec19ac7efc39f7f14319fbae9c716c38c7e5d7b8761d01ea25590b62f5f1c962c8599e22f70e001cafc781c399b961668222dbe6e38e497

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

MD5
3466738a59b6a76f5dd7059760478764

SHA1
1a722af337ea07904be6bf25ac96dbce0ed20f47

SHA256
da5c7f582d1cfdfb11807f82ca401c8b2207e9079ea46bd1b6e163d011843fd3

SHA512
08465ad91792436e624fa970095c00e474562424458205a8a3a70279c559024f66b077b29f2b884ed9c7f50c3aca42a985fbf85febc864f15de6b9dd2f12bbfa

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

MD5
6f47b62de25d1745e296a06b3f98ed19

SHA1
a688bb35a4c8a5cc198985d624a1b5a6ac5b9f6f

SHA256
15c7218eb9cef5fa0573db657b15ce3a5f0e0609f1166df8098ca7152df505b4

SHA512
dea26fff8060f44bf20fe4fff2ecbacf428727f10c0f5886fb4813e28fce9cbc3d088337c84edd9857b18514c83f1bb1cf0f51518aaecef09f30e921f4d758d7

Download Submit
memory/940-5-0x0000000000400000-0x000000000040E000-memory.dmp

Filesize
56KB

Download
memory/1752-50-0x0000000000400000-0x000000000040E000-memory.dmp

Filesize
56KB

Download
memory/3316-49-0x0000000000400000-0x000000000040E000-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