161808cf2c7e8288bbd15b60bdbd0afc4d568f5d0eebc959278ed25eb1f04c93

General

Target

161808cf2c7e8288bbd15b60bdbd0afc4d568f5d0eebc959278ed25eb1f04c93.exe
Size

45KB
MD5

cc60b3a26d75bd3698cf62e8bb0c73e9
SHA1

d8624de6dcc1c8fd70f4db8435589244e965c9cd
SHA256

161808cf2c7e8288bbd15b60bdbd0afc4d568f5d0eebc959278ed25eb1f04c93
SHA512

d49b91b4bd1037c4c61932a70f55fbeb8267408efaade11e4de2c4b75ba3a179c0994ee94e75a150b3756c08ed72c0c8cbbd064196aaccd46a7407cd964a619b
SSDEEP

768:WAUJmQCcmLCXQq6fsKiJYsIkjJVzqsVG5kuGVAQvKMb7r1:RUNHFKQbIkHvGkAFu7J

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\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

Boot or Logon Autostart Execution: Active Setup 2 TTPs 4 IoCs

Adversaries may achieve persistence by adding a Registry key to the Active Setup of the local machine.

persistence

Active Setup

T1547.014

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4F4E4E47-4a49-4a55-4F4E-4E474A494a55}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4F4E4E47-4a49-4a55-4F4E-4E474A494a55}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4F4E4E47-4a49-4a55-4F4E-4E474A494a55}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4F4E4E47-4a49-4a55-4F4E-4E474A494a55}\StubPath = "C:\\Windows\\system32\\ahuy.exe"	rmass.exe

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\drivers\etc\hosts	rmass.exe

Event Triggered Execution: Image File Execution Options Injection 1 TTPs 3 IoCs

persistence

Image File Execution Options Injection

T1546.012

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

pid	Process
3824	rmass.exe
400	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\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
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusDisableNotify = "5120"	rmass.exe

Modifies WinLogon 2 TTPs 5 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

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

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\rmass.exe	161808cf2c7e8288bbd15b60bdbd0afc4d568f5d0eebc959278ed25eb1f04c93.exe
File created	C:\Windows\SysWOW64\rmass.exe	161808cf2c7e8288bbd15b60bdbd0afc4d568f5d0eebc959278ed25eb1f04c93.exe
File opened for modification	C:\Windows\SysWOW64\ntdbg.exe	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 created	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 opened for modification	C:\Windows\SysWOW64\RECOVER32.DLL	rmass.exe
File created	C:\Windows\SysWOW64\RECOVER32.DLL	rmass.exe
File opened for modification	C:\Windows\SysWOW64\winrnt.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
3824	rmass.exe
3824	rmass.exe
3824	rmass.exe
3824	rmass.exe
3824	rmass.exe
3824	rmass.exe
400	rmass.exe
400	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3296	161808cf2c7e8288bbd15b60bdbd0afc4d568f5d0eebc959278ed25eb1f04c93.exe
Token: SeDebugPrivilege	3824	rmass.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 3296 wrote to memory of 3824	3296	161808cf2c7e8288bbd15b60bdbd0afc4d568f5d0eebc959278ed25eb1f04c93.exe	83
PID 3296 wrote to memory of 3824	3296	161808cf2c7e8288bbd15b60bdbd0afc4d568f5d0eebc959278ed25eb1f04c93.exe	83
PID 3296 wrote to memory of 3824	3296	161808cf2c7e8288bbd15b60bdbd0afc4d568f5d0eebc959278ed25eb1f04c93.exe	83
PID 3824 wrote to memory of 616	3824	rmass.exe	5
PID 3824 wrote to memory of 400	3824	rmass.exe	84
PID 3824 wrote to memory of 400	3824	rmass.exe	84
PID 3824 wrote to memory of 400	3824	rmass.exe	84
PID 3824 wrote to memory of 3440	3824	rmass.exe	56

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

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:3440
- C:\Users\Admin\AppData\Local\Temp\161808cf2c7e8288bbd15b60bdbd0afc4d568f5d0eebc959278ed25eb1f04c93.exe
  "C:\Users\Admin\AppData\Local\Temp\161808cf2c7e8288bbd15b60bdbd0afc4d568f5d0eebc959278ed25eb1f04c93.exe"
  2⤵
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3296
- - C:\Windows\SysWOW64\rmass.exe
    "C:\Windows\system32\rmass.exe"
    3⤵
    - Windows security bypass
    - Boot or Logon Autostart Execution: Active Setup
    - Drops file in Drivers directory
    - Event Triggered Execution: Image File Execution Options Injection
    - 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:3824
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:400

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

2

T1547

Active Setup

1

T1547.014

Winlogon Helper DLL

1

T1547.004

Event Triggered Execution

1

T1546

Image File Execution Options Injection

1

T1546.012

Privilege Escalation

Boot or Logon Autostart Execution

2

T1547

Active Setup

1

T1547.014

Winlogon Helper DLL

1

T1547.004

Event Triggered Execution

1

T1546

Image File Execution Options Injection

1

T1546.012

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
47KB

MD5
1e981e6bf150fe560f9f08fa01120de8

SHA1
7e057e67be7ec27eb7df3affa176dfdab997b69f

SHA256
d52115dc22231fbf743c52cd45fab09ad4b43e14e899dd3df18caecc4037fc17

SHA512
3265bdc0d1c8b3e103e7111f6f73d0e4853c48a6e01caf39fbfd89818c2b69cb01dfad90b5fe3945fe98d4cbf5d472effe8e37324fa220d833dbe1ce2d07a45a

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

Filesize
48KB

MD5
f7f3d01ea0d3e2110ff7f9a043862237

SHA1
58b601d906ec0bc53f00d0cc6d4070ed20650b0f

SHA256
75c82b1bf52ca6a5c7546f71de1af3ab17ba68dd3fa8233f984d7a124815817a

SHA512
246041ba615442a4c957c460c054c99cd69d90e6f5b0876f934b73b2b99485a3c1a95cdc6ec4a823111e52bb9aa3bdfa5180ac28952a2e0197372165668bd62a

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

Filesize
45KB

MD5
cc60b3a26d75bd3698cf62e8bb0c73e9

SHA1
d8624de6dcc1c8fd70f4db8435589244e965c9cd

SHA256
161808cf2c7e8288bbd15b60bdbd0afc4d568f5d0eebc959278ed25eb1f04c93

SHA512
d49b91b4bd1037c4c61932a70f55fbeb8267408efaade11e4de2c4b75ba3a179c0994ee94e75a150b3756c08ed72c0c8cbbd064196aaccd46a7407cd964a619b

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

Filesize
1KB

MD5
6f47b62de25d1745e296a06b3f98ed19

SHA1
a688bb35a4c8a5cc198985d624a1b5a6ac5b9f6f

SHA256
15c7218eb9cef5fa0573db657b15ce3a5f0e0609f1166df8098ca7152df505b4

SHA512
dea26fff8060f44bf20fe4fff2ecbacf428727f10c0f5886fb4813e28fce9cbc3d088337c84edd9857b18514c83f1bb1cf0f51518aaecef09f30e921f4d758d7

Download Submit
memory/400-50-0x0000000000400000-0x000000000040E000-memory.dmp

Filesize
56KB

Download
memory/3296-6-0x0000000000400000-0x000000000040E000-memory.dmp

Filesize
56KB

Download
memory/3824-49-0x0000000000400000-0x000000000040E000-memory.dmp

Filesize
56KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads