472d77a481d45fa635611896f951ffc8d87a1e4a1f773e0a3f80238694058fac

General

Target

NEAS.664a30a43fbad4d1c8219e450a917950.exe
Size

20KB
MD5

664a30a43fbad4d1c8219e450a917950
SHA1

8a4c6c6bfedb651c2a027af10447cccc681da1f0
SHA256

472d77a481d45fa635611896f951ffc8d87a1e4a1f773e0a3f80238694058fac
SHA512

86ecca6bd35f0183a68bf9d419cd28b79c5dc29c13035a2c35e1c23c8bc99694a35856e0cdc502e14fa8eabe445dd7cd48106bec5772eadb4bf5e22af191789a
SSDEEP

384:jIz4Apz1qbyU6IBsdZzpfucfoGXxDCsfwa2qPXknPmddwV3QW:jIUmz0bJ6AszzpmqxdfR2YU+ddwVB

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\{42514E44-4c45-4b47-4251-4E444C454b47}\StubPath = "C:\\Windows\\system32\\ahuy.exe"	rmass.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{42514E44-4c45-4b47-4251-4E444C454b47}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{42514E44-4c45-4b47-4251-4E444C454b47}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{42514E44-4c45-4b47-4251-4E444C454b47}\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
872	rmass.exe
4756	rmass.exe

UPX packed file 6 IoCs

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

upx

resource	yara_rule
behavioral2/files/0x00080000000231f5-3.dat	upx
behavioral2/memory/872-4-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/files/0x00080000000231f5-2.dat	upx
behavioral2/files/0x00080000000231f5-8.dat	upx
behavioral2/memory/4756-14-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/872-40-0x0000000000400000-0x0000000000411000-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\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
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
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

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\winrnt.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	NEAS.664a30a43fbad4d1c8219e450a917950.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\RECOVER32.DLL	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
File created	C:\Windows\SysWOW64\rmass.exe	NEAS.664a30a43fbad4d1c8219e450a917950.exe
File opened for modification	C:\Windows\SysWOW64\ahuy.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
872	rmass.exe
872	rmass.exe
872	rmass.exe
872	rmass.exe
872	rmass.exe
872	rmass.exe
4756	rmass.exe
4756	rmass.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	872	rmass.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 3240 wrote to memory of 872	3240	NEAS.664a30a43fbad4d1c8219e450a917950.exe	82
PID 3240 wrote to memory of 872	3240	NEAS.664a30a43fbad4d1c8219e450a917950.exe	82
PID 3240 wrote to memory of 872	3240	NEAS.664a30a43fbad4d1c8219e450a917950.exe	82
PID 872 wrote to memory of 4756	872	rmass.exe	83
PID 872 wrote to memory of 4756	872	rmass.exe	83
PID 872 wrote to memory of 4756	872	rmass.exe	83
PID 872 wrote to memory of 592	872	rmass.exe	4
PID 872 wrote to memory of 676	872	rmass.exe	28

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:592

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:676
- C:\Users\Admin\AppData\Local\Temp\NEAS.664a30a43fbad4d1c8219e450a917950.exe
  "C:\Users\Admin\AppData\Local\Temp\NEAS.664a30a43fbad4d1c8219e450a917950.exe"
  2⤵
  - Drops file in System32 directory
  - Suspicious use of WriteProcessMemory
  PID:3240
- - 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
    - 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:872
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:4756

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
20KB

MD5
7686f7cf922f5fc367ba41963c3a202a

SHA1
dd1b60a32ce3105b008e601019fdb3e029f0dd8d

SHA256
70542f464e1086e1d732f758821e28371899e09f98240174bafd00bd1e41a7e4

SHA512
bdb53c0e17401ae7f1213895fd5992eddc01fe6ca6afccf12a20f18a963b195f940a9db533adfa84481c27dfbe2c2f5ca04433bd32896e78bbf3cf9ae39b0541

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

Filesize
21KB

MD5
9d88bbc2b3df68101c0a6b16e7effc21

SHA1
91530bcdaeeb4132fc34f04b26e9f728170249c9

SHA256
a1c6522a5e36b73192621dea5fd23e9e22192d3f6625b91d8672c2067330f08f

SHA512
4c24b280b37717562c112bdb4812ba2afd1ebce82c93032cbee9334ab2d003b575e6f0072f7dc01b4b5b976dd829c4d4e7d879fc386c7ecbf73ccda965d3b745

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

Filesize
18KB

MD5
b0f139f2527edba6d4a0ea027c104afd

SHA1
6b890fab174a54dd8e67a065cb59d510c2b32ef1

SHA256
9812420e506b96cbde63810632b9826cee3720c562cf5e128d306a8a0900c05b

SHA512
95fb84544dbb656d40eb5508838c3928afa9aef0a3efbba04a5d9c654d06733d532e39a2627cc17b38411b66e40ccbcb083f25125e6d51dab42e8663d6f93e0c

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

Filesize
18KB

MD5
b0f139f2527edba6d4a0ea027c104afd

SHA1
6b890fab174a54dd8e67a065cb59d510c2b32ef1

SHA256
9812420e506b96cbde63810632b9826cee3720c562cf5e128d306a8a0900c05b

SHA512
95fb84544dbb656d40eb5508838c3928afa9aef0a3efbba04a5d9c654d06733d532e39a2627cc17b38411b66e40ccbcb083f25125e6d51dab42e8663d6f93e0c

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

Filesize
18KB

MD5
b0f139f2527edba6d4a0ea027c104afd

SHA1
6b890fab174a54dd8e67a065cb59d510c2b32ef1

SHA256
9812420e506b96cbde63810632b9826cee3720c562cf5e128d306a8a0900c05b

SHA512
95fb84544dbb656d40eb5508838c3928afa9aef0a3efbba04a5d9c654d06733d532e39a2627cc17b38411b66e40ccbcb083f25125e6d51dab42e8663d6f93e0c

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

Filesize
1KB

MD5
6f47b62de25d1745e296a06b3f98ed19

SHA1
a688bb35a4c8a5cc198985d624a1b5a6ac5b9f6f

SHA256
15c7218eb9cef5fa0573db657b15ce3a5f0e0609f1166df8098ca7152df505b4

SHA512
dea26fff8060f44bf20fe4fff2ecbacf428727f10c0f5886fb4813e28fce9cbc3d088337c84edd9857b18514c83f1bb1cf0f51518aaecef09f30e921f4d758d7

Download Submit
memory/872-4-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/872-40-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/3240-5-0x0000000000400000-0x0000000000403000-memory.dmp

Filesize
12KB

Download
memory/4756-14-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads