fafd4ca89ac890a0ea8084a44130e25ee709d76d703db994410266bac8727eb1

General

Target

fafd4ca89ac890a0ea8084a44130e25ee709d76d703db994410266bac8727eb1.exe
Size

22KB
MD5

084e5c69d98aa348a42fc92d88c96bc0
SHA1

39219cc6e3b61db06b7df8000f67aaa6e751058b
SHA256

fafd4ca89ac890a0ea8084a44130e25ee709d76d703db994410266bac8727eb1
SHA512

790d6cd3a118eed2b42bf6f72bd150c83ed26a6f1155a08bb9d34da08748b8fe878ba3c5cfb5f28078613e2fd478fd6fbf5dae71059b056428d9c604bf94a9ac
SSDEEP

384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvXVB78q:rRkiLw3HsDSARGG/r8q

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\{50544D59-4456-4d4b-5054-4D5944564d4b}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{50544D59-4456-4d4b-5054-4D5944564d4b}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{50544D59-4456-4d4b-5054-4D5944564d4b}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{50544D59-4456-4d4b-5054-4D5944564d4b}\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

2908 rmass.exe
4580 rmass.exe

pid	process
2908	rmass.exe
4580	rmass.exe

UPX packed file 6 IoCs

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

upx

Processes:

resource	yara_rule
behavioral2/memory/3184-0-0x0000000000400000-0x0000000000411000-memory.dmp	upx
C:\Windows\SysWOW64\rmass.exe	upx
behavioral2/memory/2908-9-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/3184-6-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/4580-18-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/2908-79-0x0000000000400000-0x0000000000411000-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
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
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

Drops file in System32 directory 12 IoCs

Processes:

rmass.exefafd4ca89ac890a0ea8084a44130e25ee709d76d703db994410266bac8727eb1.exe

description	ioc	process
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\ahuy.exe	rmass.exe
File created	C:\Windows\SysWOW64\RECOVER32.DLL	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 opened for modification	C:\Windows\SysWOW64\rmass.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	fafd4ca89ac890a0ea8084a44130e25ee709d76d703db994410266bac8727eb1.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\winrnt.exe	rmass.exe
File created	C:\Windows\SysWOW64\rmass.exe	fafd4ca89ac890a0ea8084a44130e25ee709d76d703db994410266bac8727eb1.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

2908 rmass.exe
2908 rmass.exe
2908 rmass.exe
2908 rmass.exe
2908 rmass.exe
2908 rmass.exe
4580 rmass.exe
4580 rmass.exe

pid	process
2908	rmass.exe
2908	rmass.exe
2908	rmass.exe
2908	rmass.exe
2908	rmass.exe
2908	rmass.exe
4580	rmass.exe
4580	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

fafd4ca89ac890a0ea8084a44130e25ee709d76d703db994410266bac8727eb1.exermass.exe

description	pid	process
Token: SeDebugPrivilege	3184	fafd4ca89ac890a0ea8084a44130e25ee709d76d703db994410266bac8727eb1.exe
Token: SeDebugPrivilege	2908	rmass.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

fafd4ca89ac890a0ea8084a44130e25ee709d76d703db994410266bac8727eb1.exermass.exe

description	pid	process	target process
PID 3184 wrote to memory of 2908	3184	fafd4ca89ac890a0ea8084a44130e25ee709d76d703db994410266bac8727eb1.exe	rmass.exe
PID 3184 wrote to memory of 2908	3184	fafd4ca89ac890a0ea8084a44130e25ee709d76d703db994410266bac8727eb1.exe	rmass.exe
PID 3184 wrote to memory of 2908	3184	fafd4ca89ac890a0ea8084a44130e25ee709d76d703db994410266bac8727eb1.exe	rmass.exe
PID 2908 wrote to memory of 4580	2908	rmass.exe	rmass.exe
PID 2908 wrote to memory of 4580	2908	rmass.exe	rmass.exe
PID 2908 wrote to memory of 4580	2908	rmass.exe	rmass.exe
PID 2908 wrote to memory of 616	2908	rmass.exe	winlogon.exe
PID 2908 wrote to memory of 3456	2908	rmass.exe	Explorer.EXE

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:616

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:3456
- C:\Users\Admin\AppData\Local\Temp\fafd4ca89ac890a0ea8084a44130e25ee709d76d703db994410266bac8727eb1.exe
  "C:\Users\Admin\AppData\Local\Temp\fafd4ca89ac890a0ea8084a44130e25ee709d76d703db994410266bac8727eb1.exe"
  2⤵
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3184
- - 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:2908
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:4580

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

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
24KB

MD5
19f0f86d732671806fc3df44af1a1909

SHA1
395301d4a35b88bc7018967459b22a4195485dfd

SHA256
3cca42528d84e910365acc67bf0dba34ae9b03247d6fc5bd89405296fe4dac84

SHA512
e8094859810c5455df2acbbb18bba0cff6de46bb8c42af2b5d62ed1f97a26f9268245dd47f3a0e24cae1bffa16f41304e126c6e5f411efc00dc98b654fc436c3

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

Filesize
25KB

MD5
b7e7fc2681aac2cfb9de8994097de6f9

SHA1
f9ac4da4a5369459bb57f7af1bae42840d720f1c

SHA256
fd2d9827a5539f7b69847bc48af33840343e45bb0cf5857b61f28f8a72d1b468

SHA512
7177ed17b61f4be32c70842c89533963b71f6fa3e92fa1953e67574b426b053316653342aacc5707a1c3f836378391032de3af19fac013298b6a66b2d6e20876

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

Filesize
22KB

MD5
084e5c69d98aa348a42fc92d88c96bc0

SHA1
39219cc6e3b61db06b7df8000f67aaa6e751058b

SHA256
fafd4ca89ac890a0ea8084a44130e25ee709d76d703db994410266bac8727eb1

SHA512
790d6cd3a118eed2b42bf6f72bd150c83ed26a6f1155a08bb9d34da08748b8fe878ba3c5cfb5f28078613e2fd478fd6fbf5dae71059b056428d9c604bf94a9ac

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

Filesize
1KB

MD5
6f47b62de25d1745e296a06b3f98ed19

SHA1
a688bb35a4c8a5cc198985d624a1b5a6ac5b9f6f

SHA256
15c7218eb9cef5fa0573db657b15ce3a5f0e0609f1166df8098ca7152df505b4

SHA512
dea26fff8060f44bf20fe4fff2ecbacf428727f10c0f5886fb4813e28fce9cbc3d088337c84edd9857b18514c83f1bb1cf0f51518aaecef09f30e921f4d758d7

Download Submit
memory/2908-9-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2908-79-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/3184-0-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/3184-6-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/4580-18-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads