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\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
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\FirewallDisableNotify = "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\{4B584950-5043-4b46-4B58-495050434b46}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4B584950-5043-4b46-4B58-495050434b46}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4B584950-5043-4b46-4B58-495050434b46}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4B584950-5043-4b46-4B58-495050434b46}\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

2984 rmass.exe
2620 rmass.exe

pid	process
2984	rmass.exe
2620	rmass.exe

Loads dropped DLL 3 IoCs

Processes:

fafd4ca89ac890a0ea8084a44130e25ee709d76d703db994410266bac8727eb1.exermass.exe

pid	process
1284	fafd4ca89ac890a0ea8084a44130e25ee709d76d703db994410266bac8727eb1.exe
1284	fafd4ca89ac890a0ea8084a44130e25ee709d76d703db994410266bac8727eb1.exe
2984	rmass.exe

UPX packed file 6 IoCs

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

upx

Processes:

resource	yara_rule
behavioral1/memory/1284-0-0x0000000000400000-0x0000000000411000-memory.dmp	upx
\Windows\SysWOW64\rmass.exe	upx
behavioral1/memory/2984-22-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2620-26-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/1284-10-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2984-60-0x0000000000400000-0x0000000000411000-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:

fafd4ca89ac890a0ea8084a44130e25ee709d76d703db994410266bac8727eb1.exermass.exe

description	ioc	process
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\aset32.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\winrnt.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\idbg32.exe	rmass.exe
File created	C:\Windows\SysWOW64\rmass.exe	fafd4ca89ac890a0ea8084a44130e25ee709d76d703db994410266bac8727eb1.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\ahuy.exe	rmass.exe
File created	C:\Windows\SysWOW64\RECOVER32.DLL	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

2984 rmass.exe
2984 rmass.exe
2984 rmass.exe
2620 rmass.exe

pid	process
2984	rmass.exe
2984	rmass.exe
2984	rmass.exe
2620	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

fafd4ca89ac890a0ea8084a44130e25ee709d76d703db994410266bac8727eb1.exermass.exe

description	pid	process
Token: SeDebugPrivilege	1284	fafd4ca89ac890a0ea8084a44130e25ee709d76d703db994410266bac8727eb1.exe
Token: SeDebugPrivilege	2984	rmass.exe

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

fafd4ca89ac890a0ea8084a44130e25ee709d76d703db994410266bac8727eb1.exermass.exe

description	pid	process	target process
PID 1284 wrote to memory of 2984	1284	fafd4ca89ac890a0ea8084a44130e25ee709d76d703db994410266bac8727eb1.exe	rmass.exe
PID 1284 wrote to memory of 2984	1284	fafd4ca89ac890a0ea8084a44130e25ee709d76d703db994410266bac8727eb1.exe	rmass.exe
PID 1284 wrote to memory of 2984	1284	fafd4ca89ac890a0ea8084a44130e25ee709d76d703db994410266bac8727eb1.exe	rmass.exe
PID 1284 wrote to memory of 2984	1284	fafd4ca89ac890a0ea8084a44130e25ee709d76d703db994410266bac8727eb1.exe	rmass.exe
PID 2984 wrote to memory of 424	2984	rmass.exe	winlogon.exe
PID 2984 wrote to memory of 1208	2984	rmass.exe	Explorer.EXE
PID 2984 wrote to memory of 2620	2984	rmass.exe	rmass.exe
PID 2984 wrote to memory of 2620	2984	rmass.exe	rmass.exe
PID 2984 wrote to memory of 2620	2984	rmass.exe	rmass.exe
PID 2984 wrote to memory of 2620	2984	rmass.exe	rmass.exe

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:424

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:1208
- C:\Users\Admin\AppData\Local\Temp\fafd4ca89ac890a0ea8084a44130e25ee709d76d703db994410266bac8727eb1.exe
  "C:\Users\Admin\AppData\Local\Temp\fafd4ca89ac890a0ea8084a44130e25ee709d76d703db994410266bac8727eb1.exe"
  2⤵
  - Loads dropped DLL
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1284
- - 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
    - 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:2984
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:2620

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
c3d6db6ed38953576741db50923c6905

SHA1
9726855df055dc6b730add060d114dd5c257cc41

SHA256
c63ebd5385e9ebb94942f114eb3e26cb8c07f82956d22fc0de46ce0ccb518265

SHA512
70750db08e2343e43b31611796349c12202cc2271a92af5d3e3e1f5e40d0675f174bcc4f00f5b3e3d3bb6e2b3da3aa86969f5b33d9251c40e9447819a27b7773

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

Filesize
25KB

MD5
4ee9df7ba80219494277bdc788489e86

SHA1
501790c3aee0e5a8148ea6a2f909d062dbf4e706

SHA256
7fd888f83569a0332c9205a887139710ef65292a6661b2b5d1b10fca8660916d

SHA512
6f87400ff6ab73b96eb2fb23deafa01c1c07647587e0b2a65f5222134c8bc98d6d649e2b2d19a3b157dcaa755804b7cfe21181c172461506ce6679b125e4c3f5

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
084e5c69d98aa348a42fc92d88c96bc0

SHA1
39219cc6e3b61db06b7df8000f67aaa6e751058b

SHA256
fafd4ca89ac890a0ea8084a44130e25ee709d76d703db994410266bac8727eb1

SHA512
790d6cd3a118eed2b42bf6f72bd150c83ed26a6f1155a08bb9d34da08748b8fe878ba3c5cfb5f28078613e2fd478fd6fbf5dae71059b056428d9c604bf94a9ac

Download Submit
memory/1284-10-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/1284-0-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/1284-11-0x00000000002B0000-0x00000000002C1000-memory.dmp

Filesize
68KB

Download
memory/1284-83-0x00000000002B0000-0x00000000002C1000-memory.dmp

Filesize
68KB

Download
memory/2620-26-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2984-25-0x00000000003A0000-0x00000000003B1000-memory.dmp

Filesize
68KB

Download
memory/2984-60-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2984-22-0x0000000000400000-0x0000000000411000-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