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\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\{4C4C5844-4845-5743-4C4C-584448455743}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4C4C5844-4845-5743-4C4C-584448455743}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4C4C5844-4845-5743-4C4C-584448455743}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4C4C5844-4845-5743-4C4C-584448455743}\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

1904 rmass.exe
4692 rmass.exe

pid	process
1904	rmass.exe
4692	rmass.exe

UPX packed file 4 IoCs

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

upx

Processes:

resource	yara_rule
C:\Windows\SysWOW64\rmass.exe	upx
behavioral2/memory/1904-5-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/1904-48-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/4692-49-0x0000000000400000-0x0000000000411000-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\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
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 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	53c5e8dd4a49773f95c6b60d4dd7e0ef9f066be6a3146f961c59e16b59c60217.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
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\ntdbg.exe	rmass.exe
File created	C:\Windows\SysWOW64\ahuy.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\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

1904 rmass.exe
1904 rmass.exe
1904 rmass.exe
1904 rmass.exe
1904 rmass.exe
1904 rmass.exe
4692 rmass.exe
4692 rmass.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

rmass.exe

description pid process

Token: SeDebugPrivilege 1904 rmass.exe

pid	process
1904	rmass.exe
1904	rmass.exe
1904	rmass.exe
1904	rmass.exe
1904	rmass.exe
1904	rmass.exe
4692	rmass.exe
4692	rmass.exe

description	pid	process
Token: SeDebugPrivilege	1904	rmass.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

53c5e8dd4a49773f95c6b60d4dd7e0ef9f066be6a3146f961c59e16b59c60217.exermass.exe

description	pid	process	target process
PID 4888 wrote to memory of 1904	4888	53c5e8dd4a49773f95c6b60d4dd7e0ef9f066be6a3146f961c59e16b59c60217.exe	rmass.exe
PID 4888 wrote to memory of 1904	4888	53c5e8dd4a49773f95c6b60d4dd7e0ef9f066be6a3146f961c59e16b59c60217.exe	rmass.exe
PID 4888 wrote to memory of 1904	4888	53c5e8dd4a49773f95c6b60d4dd7e0ef9f066be6a3146f961c59e16b59c60217.exe	rmass.exe
PID 1904 wrote to memory of 4692	1904	rmass.exe	rmass.exe
PID 1904 wrote to memory of 4692	1904	rmass.exe	rmass.exe
PID 1904 wrote to memory of 4692	1904	rmass.exe	rmass.exe
PID 1904 wrote to memory of 608	1904	rmass.exe	winlogon.exe
PID 1904 wrote to memory of 3424	1904	rmass.exe	Explorer.EXE

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:608

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:3424

C:\Users\Admin\AppData\Local\Temp\53c5e8dd4a49773f95c6b60d4dd7e0ef9f066be6a3146f961c59e16b59c60217.exe
"C:\Users\Admin\AppData\Local\Temp\53c5e8dd4a49773f95c6b60d4dd7e0ef9f066be6a3146f961c59e16b59c60217.exe"
2⤵
- Drops file in System32 directory
- Suspicious use of WriteProcessMemory
PID:4888

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
- 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:1904

C:\Windows\SysWOW64\rmass.exe
--k33p
4⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
PID:4692

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
9b65ac43e9158c2ecb7c5f76e0b6855b

SHA1
6b8798fa518e920e88962160094714f2d142548c

SHA256
460174c5d3b3c8e82433f372d3b0102fb315ab85b3951d0fb62b9d3a00151762

SHA512
0aec21e1840f38a08ee67223132b6d4ead365a70333dd8cc5e4569db5ea8bf2b25343e989463caa6ec507f6e3194c48851294fae33b831070709a711aaafe6d5

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

Filesize
25KB

MD5
fdb8d0e03934535098c1f051c107895c

SHA1
bd3df0b76ac8f92c72bd55352ed5c69b4bac4e8b

SHA256
db2e8399fba948e6bdd9caf8869f76d16a10f8a8dba880b7d7807f3f42bc380a

SHA512
e50dab4e56df945c26741374ba69dff55052d4c01497280eb01b6ada7c8a5fe0395f96567dd770ce20be68c3fdd5d87d6173b08b20c4a273fa46557d37ac987d

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

Filesize
22KB

MD5
c46ec2273a24210e8fdae87474f7fd99

SHA1
4d2115eedd04e1ecc48d3d59427c834716947f44

SHA256
495e114955e1db035bc4ca05e76acc4a19331abb2e751388c91cd086a5f9a1ad

SHA512
72eea4e531f00409cec80fd40c0dba0d3f03eafc03a61839e5a52d4fea48af9af8c1d9d4dd7e63d3681563e8de4cd248ca2d234e6d4036e4a3bb396e9535a33e

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

Filesize
1KB

MD5
6f47b62de25d1745e296a06b3f98ed19

SHA1
a688bb35a4c8a5cc198985d624a1b5a6ac5b9f6f

SHA256
15c7218eb9cef5fa0573db657b15ce3a5f0e0609f1166df8098ca7152df505b4

SHA512
dea26fff8060f44bf20fe4fff2ecbacf428727f10c0f5886fb4813e28fce9cbc3d088337c84edd9857b18514c83f1bb1cf0f51518aaecef09f30e921f4d758d7

Download Submit
memory/1904-5-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/1904-48-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/4692-49-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/4888-3-0x0000000000400000-0x0000000000403000-memory.dmp

Filesize
12KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads