53c5e8dd4a49773f95c6b60d4dd7e0ef9f066be6a3146f961c59e16b59c60217

General

Target

53c5e8dd4a49773f95c6b60d4dd7e0ef9f066be6a3146f961c59e16b59c60217.exe
Size

24KB
MD5

021feaa6171ab07bc0ed1e098382c800
SHA1

bd7bdf1b497f0e5bba520f3898c2fdc3edcec1f5
SHA256

53c5e8dd4a49773f95c6b60d4dd7e0ef9f066be6a3146f961c59e16b59c60217
SHA512

be1afee36378daee17ba2681d5dbb7a279c6a9e06486d6175479d0e91b68a9796780fcbf8e4a1e3c1589b10c8ca8b5228638baae6142903ad8b1912912c987e2
SSDEEP

768:jIUWqeC/juNK4QPv71sL83w/0nIqM0ejXIt:jxKNK4271syw/g

Score

10^/10

evasion persistence trojan upx

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
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{484B554C-4249-4255-484B-554C42494255}\StubPath = "C:\\Windows\\system32\\ahuy.exe"	rmass.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{484B554C-4249-4255-484B-554C42494255}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{484B554C-4249-4255-484B-554C42494255}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{484B554C-4249-4255-484B-554C42494255}\IsInstalled = "1"	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

3048 rmass.exe
2520 rmass.exe

pid	process
3048	rmass.exe
2520	rmass.exe

Loads dropped DLL 3 IoCs

Processes:

53c5e8dd4a49773f95c6b60d4dd7e0ef9f066be6a3146f961c59e16b59c60217.exermass.exe

pid	process
1812	53c5e8dd4a49773f95c6b60d4dd7e0ef9f066be6a3146f961c59e16b59c60217.exe
1812	53c5e8dd4a49773f95c6b60d4dd7e0ef9f066be6a3146f961c59e16b59c60217.exe
3048	rmass.exe

UPX packed file 5 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

Processes:

resource	yara_rule
\Windows\SysWOW64\rmass.exe	upx
behavioral1/memory/1812-2-0x0000000000020000-0x0000000000031000-memory.dmp	upx
behavioral1/memory/3048-10-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2520-22-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/3048-56-0x0000000000400000-0x0000000000411000-memory.dmp	upx

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

Drops file in System32 directory 12 IoCs

Processes:

rmass.exe53c5e8dd4a49773f95c6b60d4dd7e0ef9f066be6a3146f961c59e16b59c60217.exe

description	ioc	process
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\rmass.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	53c5e8dd4a49773f95c6b60d4dd7e0ef9f066be6a3146f961c59e16b59c60217.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 created	C:\Windows\SysWOW64\rmass.exe	53c5e8dd4a49773f95c6b60d4dd7e0ef9f066be6a3146f961c59e16b59c60217.exe
File created	C:\Windows\SysWOW64\ntdbg.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\ahuy.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

3048 rmass.exe
3048 rmass.exe
3048 rmass.exe
2520 rmass.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

rmass.exe

description pid process

Token: SeDebugPrivilege 3048 rmass.exe

pid	process
3048	rmass.exe
3048	rmass.exe
3048	rmass.exe
2520	rmass.exe

description	pid	process
Token: SeDebugPrivilege	3048	rmass.exe

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

53c5e8dd4a49773f95c6b60d4dd7e0ef9f066be6a3146f961c59e16b59c60217.exermass.exe

description	pid	process	target process
PID 1812 wrote to memory of 3048	1812	53c5e8dd4a49773f95c6b60d4dd7e0ef9f066be6a3146f961c59e16b59c60217.exe	rmass.exe
PID 1812 wrote to memory of 3048	1812	53c5e8dd4a49773f95c6b60d4dd7e0ef9f066be6a3146f961c59e16b59c60217.exe	rmass.exe
PID 1812 wrote to memory of 3048	1812	53c5e8dd4a49773f95c6b60d4dd7e0ef9f066be6a3146f961c59e16b59c60217.exe	rmass.exe
PID 1812 wrote to memory of 3048	1812	53c5e8dd4a49773f95c6b60d4dd7e0ef9f066be6a3146f961c59e16b59c60217.exe	rmass.exe
PID 3048 wrote to memory of 436	3048	rmass.exe	winlogon.exe
PID 3048 wrote to memory of 1204	3048	rmass.exe	Explorer.EXE
PID 3048 wrote to memory of 2520	3048	rmass.exe	rmass.exe
PID 3048 wrote to memory of 2520	3048	rmass.exe	rmass.exe
PID 3048 wrote to memory of 2520	3048	rmass.exe	rmass.exe
PID 3048 wrote to memory of 2520	3048	rmass.exe	rmass.exe

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:436

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:1204

C:\Users\Admin\AppData\Local\Temp\53c5e8dd4a49773f95c6b60d4dd7e0ef9f066be6a3146f961c59e16b59c60217.exe
"C:\Users\Admin\AppData\Local\Temp\53c5e8dd4a49773f95c6b60d4dd7e0ef9f066be6a3146f961c59e16b59c60217.exe"
2⤵
- Loads dropped DLL
- Drops file in System32 directory
- Suspicious use of WriteProcessMemory
PID:1812

C:\Windows\SysWOW64\rmass.exe
"C:\Windows\SysWOW64\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:3048

C:\Windows\SysWOW64\rmass.exe
--k33p
4⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
PID:2520

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
24KB

MD5
06efe054636a82e1e7a9d69f5d307706

SHA1
c2a0d2591d9ff9b67ce3e19372a83d8082b85cc5

SHA256
1d255de92b1e5266a2ef741619824d08baa519a17f0e1ca1cddad10021890630

SHA512
150b7502b30eef7534586fcf55dc0a678884b25ecf20c64b0aa5a39f931a980ba9d830844c2a166a315ae15d9fbd28d5c8e7b567a4417678160ca8aebca784db

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

Filesize
25KB

MD5
b3fd9a0447f7580e1e4c4cfb57992c83

SHA1
86506f7d47bd012dc37aa1ee3896a11bcb128782

SHA256
11cf1acd7b33825039029b742cb3ad2cb25bdef3c08674b07d7d674fbe1f95f7

SHA512
3ac7ab681e009a750a04d9c261ed50792782200a20234d394a43c545dd2ed016caacad1d9e9a3e709e2a5d6b6c4ab956b32c9f44714b6536e8ec97fd9429dfb0

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
22KB

MD5
c46ec2273a24210e8fdae87474f7fd99

SHA1
4d2115eedd04e1ecc48d3d59427c834716947f44

SHA256
495e114955e1db035bc4ca05e76acc4a19331abb2e751388c91cd086a5f9a1ad

SHA512
72eea4e531f00409cec80fd40c0dba0d3f03eafc03a61839e5a52d4fea48af9af8c1d9d4dd7e63d3681563e8de4cd248ca2d234e6d4036e4a3bb396e9535a33e

Download Submit
memory/1812-2-0x0000000000020000-0x0000000000031000-memory.dmp

Filesize
68KB

Download
memory/1812-8-0x0000000000400000-0x0000000000403000-memory.dmp

Filesize
12KB

Download
memory/2520-22-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/3048-10-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/3048-56-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads