5a54e57a8054961caaee3e8ad6d5aeb7703e9e68147a5cfbd05d71dbe9481433

General

Target

5a54e57a8054961caaee3e8ad6d5aeb7703e9e68147a5cfbd05d71dbe9481433.exe
Size

22KB
MD5

0e4f2f9c303c1988cb4a575896c2f9ca
SHA1

d45890164bd1b440828d369ae110d0c0545c6378
SHA256

5a54e57a8054961caaee3e8ad6d5aeb7703e9e68147a5cfbd05d71dbe9481433
SHA512

30170e76617fa7236c4f5219f14a3d75c37cba51124f07c73248edbe7f46893111d9e14716385f35b82e72e26b75098809f5d5a35793aa59c942f9ea1978af76
SSDEEP

384:jIz4Wd82EMVCGW8oSukbLpe2KKMOHbQVJv79tlDvz+ioL9+3w/0nIqeObSUrH:jIUWqeC/juNK4QPv71sL83w/0nIqeOj7

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\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\{55485251-4b4a-4350-5548-52514B4A4350}\StubPath = "C:\\Windows\\system32\\ahuy.exe"	rmass.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{55485251-4b4a-4350-5548-52514B4A4350}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{55485251-4b4a-4350-5548-52514B4A4350}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{55485251-4b4a-4350-5548-52514B4A4350}\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
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
2804	rmass.exe
2632	rmass.exe

Loads dropped DLL 3 IoCs

pid	Process
1744	5a54e57a8054961caaee3e8ad6d5aeb7703e9e68147a5cfbd05d71dbe9481433.exe
1744	5a54e57a8054961caaee3e8ad6d5aeb7703e9e68147a5cfbd05d71dbe9481433.exe
2804	rmass.exe

UPX packed file 6 IoCs

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

upx

resource	yara_rule
behavioral1/files/0x000a0000000120fa-1.dat	upx
behavioral1/memory/1744-2-0x0000000000020000-0x0000000000031000-memory.dmp	upx
behavioral1/memory/2804-10-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2632-23-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2804-57-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2632-58-0x0000000000400000-0x0000000000411000-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\RECOVER32.DLL	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\ntdbg.exe	rmass.exe
File created	C:\Windows\SysWOW64\ahuy.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\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\rmass.exe	5a54e57a8054961caaee3e8ad6d5aeb7703e9e68147a5cfbd05d71dbe9481433.exe
File created	C:\Windows\SysWOW64\rmass.exe	5a54e57a8054961caaee3e8ad6d5aeb7703e9e68147a5cfbd05d71dbe9481433.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 4 IoCs

pid	Process
2804	rmass.exe
2804	rmass.exe
2804	rmass.exe
2632	rmass.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2804	rmass.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 1744 wrote to memory of 2804	1744	5a54e57a8054961caaee3e8ad6d5aeb7703e9e68147a5cfbd05d71dbe9481433.exe	28
PID 1744 wrote to memory of 2804	1744	5a54e57a8054961caaee3e8ad6d5aeb7703e9e68147a5cfbd05d71dbe9481433.exe	28
PID 1744 wrote to memory of 2804	1744	5a54e57a8054961caaee3e8ad6d5aeb7703e9e68147a5cfbd05d71dbe9481433.exe	28
PID 1744 wrote to memory of 2804	1744	5a54e57a8054961caaee3e8ad6d5aeb7703e9e68147a5cfbd05d71dbe9481433.exe	28
PID 2804 wrote to memory of 432	2804	rmass.exe	5
PID 2804 wrote to memory of 1196	2804	rmass.exe	21
PID 2804 wrote to memory of 2632	2804	rmass.exe	29
PID 2804 wrote to memory of 2632	2804	rmass.exe	29
PID 2804 wrote to memory of 2632	2804	rmass.exe	29
PID 2804 wrote to memory of 2632	2804	rmass.exe	29

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:432

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:1196
- C:\Users\Admin\AppData\Local\Temp\5a54e57a8054961caaee3e8ad6d5aeb7703e9e68147a5cfbd05d71dbe9481433.exe
  "C:\Users\Admin\AppData\Local\Temp\5a54e57a8054961caaee3e8ad6d5aeb7703e9e68147a5cfbd05d71dbe9481433.exe"
  2⤵
  - Loads dropped DLL
  - Drops file in System32 directory
  - Suspicious use of WriteProcessMemory
  PID:1744
- - C:\Windows\SysWOW64\rmass.exe
    "C:\Windows\SysWOW64\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:2804
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:2632

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
22KB

MD5
0352b50eebae90f0e9891126ac8468e2

SHA1
179c43620775335d27ab328a9636558a2749c56e

SHA256
efd461f0e396a4620e34c653b2868a0882eae8fa1704540fb29d69aac7af3527

SHA512
932f921ba1a7dae02b987eaf4e8486fc2bb50ce32f3e5a129684652a452b06171235b363cd9ca3a4b9aacbd14430ef1964ada95539639359e3f850a94a39e55d

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

Filesize
23KB

MD5
f0f5432fbd924ce7147e4e620d291181

SHA1
30c75957f4353c2fa4f8a583caa34be28fd258bc

SHA256
ef252ec0996c44f1c6ea604fd274e0d1ad3e046ef2d112e6b42524dc992e5312

SHA512
716aeb4f2a2f9fb5d49b61d084fcf4c3c835de781cfa424ecc163a0b28c18aa3d2a190a4f23e10523f795f8d221743610836145ce3b9c824888e344bb38be191

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
20KB

MD5
f1113646a6a356a81b960aa6c8b4239f

SHA1
e3a7784b0179f07da5c8c8ce1e019b6bb105e3fd

SHA256
6025173244f04ea84d7d7c2666787457668e744c46531abfd323575fc7d66e37

SHA512
d6540c6a2cd5651e416c377f0fb7f3a10965619a767e8c7c166f9837dc17090e8349e796b7041aaa22d32d956a173c84dfbf25e6dc1e951c62e1f59afcf61271

Download Submit
memory/1744-2-0x0000000000020000-0x0000000000031000-memory.dmp

Filesize
68KB

Download
memory/1744-8-0x0000000000400000-0x0000000000403000-memory.dmp

Filesize
12KB

Download
memory/2632-23-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2632-58-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2804-10-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2804-21-0x00000000003B0000-0x00000000003C1000-memory.dmp

Filesize
68KB

Download
memory/2804-57-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads