2fadb4d57b26d7c291b0a9a8225b1d0ec27e9a4bd24f73e94bd16f2db32c83b8

General

Target

2fadb4d57b26d7c291b0a9a8225b1d0ec27e9a4bd24f73e94bd16f2db32c83b8.exe
Size

22KB
MD5

cc9e4ee13bf55231fe71970eaf7f9719
SHA1

6ba667eaa37f388ca7c73be402c81a2f33e72f97
SHA256

2fadb4d57b26d7c291b0a9a8225b1d0ec27e9a4bd24f73e94bd16f2db32c83b8
SHA512

b48bf4b46a68e5b7d5a327d8834e53ea5c1583873332f0ff6a5686449a8762318a965944f7e94c7213129c7f51922d27db56f23ec8a4c252345ca7f19bbf6c94
SSDEEP

384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvXVB7JmvY1O:rRkiLw3HsDSARGG/rv1O

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

description	ioc	Process
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
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusOverride = "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}\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
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

Sets file execution options in registry 2 TTPs 3 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

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
2972	rmass.exe
2032	rmass.exe

UPX packed file 7 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4592-0-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/files/0x000c000000023b56-5.dat	upx
behavioral2/memory/4592-8-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/2972-9-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/2032-19-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/2972-53-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/2032-54-0x0000000000400000-0x0000000000411000-memory.dmp	upx

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
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	2fadb4d57b26d7c291b0a9a8225b1d0ec27e9a4bd24f73e94bd16f2db32c83b8.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\winrnt.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\rmass.exe	2fadb4d57b26d7c291b0a9a8225b1d0ec27e9a4bd24f73e94bd16f2db32c83b8.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 created	C:\Windows\SysWOW64\RECOVER32.DLL	rmass.exe
File opened for modification	C:\Windows\SysWOW64\aset32.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\aset32.exe	rmass.exe
File opened for modification	C:\Program Files (x86)\Common Files\System\idbg32.exe	rmass.exe
File opened for modification	C:\Program Files (x86)\Common Files\System\winrnt.exe	rmass.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
2972	rmass.exe
2972	rmass.exe
2972	rmass.exe
2972	rmass.exe
2972	rmass.exe
2972	rmass.exe
2032	rmass.exe
2032	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4592	2fadb4d57b26d7c291b0a9a8225b1d0ec27e9a4bd24f73e94bd16f2db32c83b8.exe
Token: SeDebugPrivilege	2972	rmass.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 4592 wrote to memory of 2972	4592	2fadb4d57b26d7c291b0a9a8225b1d0ec27e9a4bd24f73e94bd16f2db32c83b8.exe	85
PID 4592 wrote to memory of 2972	4592	2fadb4d57b26d7c291b0a9a8225b1d0ec27e9a4bd24f73e94bd16f2db32c83b8.exe	85
PID 4592 wrote to memory of 2972	4592	2fadb4d57b26d7c291b0a9a8225b1d0ec27e9a4bd24f73e94bd16f2db32c83b8.exe	85
PID 2972 wrote to memory of 600	2972	rmass.exe	5
PID 2972 wrote to memory of 2032	2972	rmass.exe	86
PID 2972 wrote to memory of 2032	2972	rmass.exe	86
PID 2972 wrote to memory of 2032	2972	rmass.exe	86
PID 2972 wrote to memory of 3420	2972	rmass.exe	57

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:600

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:3420
- C:\Users\Admin\AppData\Local\Temp\2fadb4d57b26d7c291b0a9a8225b1d0ec27e9a4bd24f73e94bd16f2db32c83b8.exe
  "C:\Users\Admin\AppData\Local\Temp\2fadb4d57b26d7c291b0a9a8225b1d0ec27e9a4bd24f73e94bd16f2db32c83b8.exe"
  2⤵
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4592
- - 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:2972
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:2032

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
616a223a7ca4aba87a933c50678133f6

SHA1
b15b1d63d7c13630ec1853c8c4f58f8270e34933

SHA256
8cd8c2d4eb94615751f1daf2d921cf1c0e9116ec03b24517f1a76e436ead4bf4

SHA512
7d0c9de6458d810a47f0c2f69d21f42f97cca905c6a1ac59fbc577fca92f7753dd756e7d08787c3cdb0488ced379cdfbf0f60c08a96e594e046c820f34b1c48a

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

Filesize
25KB

MD5
ee000ee35bf9e6a6c7e8425cb230ab8c

SHA1
50d00419c237c4503c63ec450745fbe37e196c5b

SHA256
48f34ac08b792d21e79966b46a9a1f14eca392ab6f473b015cbf2a547457eac8

SHA512
2f849599701de5a796b920cc670c01f7052e25a884cafcf6a5c5c2164391af5526ff70793c5a2be19545f14b5fba977c1e9ee5407affcdfda8a9f477382b75b4

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

Filesize
22KB

MD5
cc9e4ee13bf55231fe71970eaf7f9719

SHA1
6ba667eaa37f388ca7c73be402c81a2f33e72f97

SHA256
2fadb4d57b26d7c291b0a9a8225b1d0ec27e9a4bd24f73e94bd16f2db32c83b8

SHA512
b48bf4b46a68e5b7d5a327d8834e53ea5c1583873332f0ff6a5686449a8762318a965944f7e94c7213129c7f51922d27db56f23ec8a4c252345ca7f19bbf6c94

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

Filesize
1KB

MD5
6f47b62de25d1745e296a06b3f98ed19

SHA1
a688bb35a4c8a5cc198985d624a1b5a6ac5b9f6f

SHA256
15c7218eb9cef5fa0573db657b15ce3a5f0e0609f1166df8098ca7152df505b4

SHA512
dea26fff8060f44bf20fe4fff2ecbacf428727f10c0f5886fb4813e28fce9cbc3d088337c84edd9857b18514c83f1bb1cf0f51518aaecef09f30e921f4d758d7

Download Submit
memory/2032-19-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2032-54-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2972-9-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2972-53-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/4592-0-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/4592-8-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads