c4535fb1cdaf411ffce719e2edc58b705ad0eb088506e21a861669e2941a4f0d

General

Target

a592ed7e9f64453f46384487bd4e8d67.exe
Size

44KB
MD5

a592ed7e9f64453f46384487bd4e8d67
SHA1

c723cb147090bb36e4a794414a48af708ab1fb62
SHA256

c4535fb1cdaf411ffce719e2edc58b705ad0eb088506e21a861669e2941a4f0d
SHA512

ad11d7778bfad0c2447f8b0868b6be9d004332bd4e0b272e6d4bdf87e147fd16acc5cd75a54e043eb17362b19eb3276c366cde7ed87d037b8924da102836613c
SSDEEP

768:WAUJmQCcmLCXQq6fsKiJYsIkjJVzqsVG5kuGVAQv/+64:RUNHFKQbIkHvGkAu+F

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

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

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

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{45584E43-4c5a-4c49-4558-4E434C5A4c49}\StubPath = "C:\\Windows\\system32\\ahuy.exe"	rmass.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{45584E43-4c5a-4c49-4558-4E434C5A4c49}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{45584E43-4c5a-4c49-4558-4E434C5A4c49}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{45584E43-4c5a-4c49-4558-4E434C5A4c49}\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

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exe\Debugger = "C:\\Windows\\system32\\ntdbg.exe"	rmass.exe
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

Executes dropped EXE 2 IoCs

pid	Process
3548	rmass.exe
1900	rmass.exe

Windows security modification 2 TTPs 4 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

T1112

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

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

description	ioc	Process
File created	C:\Windows\SysWOW64\ntdbg.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 opened for modification	C:\Windows\SysWOW64\rmass.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	a592ed7e9f64453f46384487bd4e8d67.exe
File created	C:\Windows\SysWOW64\rmass.exe	a592ed7e9f64453f46384487bd4e8d67.exe
File opened for modification	C:\Windows\SysWOW64\ntdbg.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\ahuy.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

Drops file in Program Files directory 3 IoCs

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

pid	Process
3548	rmass.exe
3548	rmass.exe
3548	rmass.exe
3548	rmass.exe
3548	rmass.exe
3548	rmass.exe
1900	rmass.exe
1900	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	668	a592ed7e9f64453f46384487bd4e8d67.exe
Token: SeDebugPrivilege	3548	rmass.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 668 wrote to memory of 3548	668	a592ed7e9f64453f46384487bd4e8d67.exe	84
PID 668 wrote to memory of 3548	668	a592ed7e9f64453f46384487bd4e8d67.exe	84
PID 668 wrote to memory of 3548	668	a592ed7e9f64453f46384487bd4e8d67.exe	84
PID 3548 wrote to memory of 612	3548	rmass.exe	5
PID 3548 wrote to memory of 3520	3548	rmass.exe	56
PID 3548 wrote to memory of 1900	3548	rmass.exe	85
PID 3548 wrote to memory of 1900	3548	rmass.exe	85
PID 3548 wrote to memory of 1900	3548	rmass.exe	85

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

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:3520
- C:\Users\Admin\AppData\Local\Temp\a592ed7e9f64453f46384487bd4e8d67.exe
  "C:\Users\Admin\AppData\Local\Temp\a592ed7e9f64453f46384487bd4e8d67.exe"
  2⤵
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:668
- - 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:3548
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:1900

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
46KB

MD5
183f16829270b718a275380f186f2136

SHA1
81a30babbe3719652a1e3b1f80712f359c413626

SHA256
ccb0aa47e01608298456529f6193fddc4faeb84c1c8c335eefbb11ffed718766

SHA512
a81c2e02e651acadd4729ec68d97b1f0cebb9eb486e71d71d07159e275b52313da2c822ca663107fb2797f4e685344b99f2c1b74b8e642b794eeb7b6b405f783

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

Filesize
47KB

MD5
7380c188758c3b30cdf266e9f2847b6e

SHA1
89780aa1744f4abf3617af1bb6925c0efcbe1a4b

SHA256
4e66f8f00b8bb5065b4724b5b750478c17c557ce4f596ada47c66f99c3e4faa3

SHA512
caeb402dd65ec6ffc2a54e7b5ca15229ab6aa4272b5344f83995829d8458154043dd6a1e76edf0e60ed5b036d8fa3912b48b16cc6447651305fb45cd990b8e7d

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

Filesize
44KB

MD5
a592ed7e9f64453f46384487bd4e8d67

SHA1
c723cb147090bb36e4a794414a48af708ab1fb62

SHA256
c4535fb1cdaf411ffce719e2edc58b705ad0eb088506e21a861669e2941a4f0d

SHA512
ad11d7778bfad0c2447f8b0868b6be9d004332bd4e0b272e6d4bdf87e147fd16acc5cd75a54e043eb17362b19eb3276c366cde7ed87d037b8924da102836613c

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

Filesize
1KB

MD5
6f47b62de25d1745e296a06b3f98ed19

SHA1
a688bb35a4c8a5cc198985d624a1b5a6ac5b9f6f

SHA256
15c7218eb9cef5fa0573db657b15ce3a5f0e0609f1166df8098ca7152df505b4

SHA512
dea26fff8060f44bf20fe4fff2ecbacf428727f10c0f5886fb4813e28fce9cbc3d088337c84edd9857b18514c83f1bb1cf0f51518aaecef09f30e921f4d758d7

Download Submit
memory/668-5-0x0000000000400000-0x000000000040E000-memory.dmp

Filesize
56KB

Download
memory/1900-50-0x0000000000400000-0x000000000040E000-memory.dmp

Filesize
56KB

Download
memory/3548-49-0x0000000000400000-0x000000000040E000-memory.dmp

Filesize
56KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads