27d6cc2540bca54e844fa42543028f8df9ee6d28783147e37839cc99cc4286dc

Analysis

max time kernel
155s
max time network
126s
platform
windows7_x64
resource
win7-20231025-en
resource tags

arch:x64arch:x86image:win7-20231025-enlocale:en-usos:windows7-x64system
submitted
16-11-2023 17:38

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General

Target

NEAS.75fe7fab2515ee089305eda63d8c7ad4.exe
Size

19KB
MD5

75fe7fab2515ee089305eda63d8c7ad4
SHA1

13ebdff519c6c5ae15822245cd37abac5c4112dd
SHA256

27d6cc2540bca54e844fa42543028f8df9ee6d28783147e37839cc99cc4286dc
SHA512

f626e836a14e483c8ad5b3e7a1cf57d0f86cf8e1d08d0ab2830c12395a5ffeb3da1cfc2a137ef59c7be914839d6cfa59cacb0c42ed4d77400faeccfec6a8bde6
SSDEEP

384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvXOrL:rRkiLw3HsDSARGG/+rL

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\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

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
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{50545A53-464b-4946-5054-5A53464B4946}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{50545A53-464b-4946-5054-5A53464B4946}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{50545A53-464b-4946-5054-5A53464B4946}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{50545A53-464b-4946-5054-5A53464B4946}\StubPath = "C:\\Windows\\system32\\ahuy.exe"	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
2304	rmass.exe
2132	rmass.exe

Loads dropped DLL 3 IoCs

pid	Process
2364	NEAS.75fe7fab2515ee089305eda63d8c7ad4.exe
2364	NEAS.75fe7fab2515ee089305eda63d8c7ad4.exe
2304	rmass.exe

UPX packed file 11 IoCs

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

upx

resource	yara_rule
behavioral1/memory/2364-0-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/files/0x0008000000012023-4.dat	upx
behavioral1/files/0x0008000000012023-18.dat	upx
behavioral1/files/0x0008000000012023-12.dat	upx
behavioral1/files/0x0008000000012023-11.dat	upx
behavioral1/files/0x0008000000012023-17.dat	upx
behavioral1/memory/2364-10-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/files/0x0008000000012023-7.dat	upx
behavioral1/files/0x0008000000012023-6.dat	upx
behavioral1/memory/2304-24-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2132-23-0x0000000000400000-0x0000000000411000-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\aset32.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	NEAS.75fe7fab2515ee089305eda63d8c7ad4.exe
File created	C:\Windows\SysWOW64\rmass.exe	NEAS.75fe7fab2515ee089305eda63d8c7ad4.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\idbg32.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\ntdbg.exe	rmass.exe
File created	C:\Windows\SysWOW64\ntdbg.exe	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\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 4 IoCs

pid	Process
2304	rmass.exe
2304	rmass.exe
2304	rmass.exe
2132	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2364	NEAS.75fe7fab2515ee089305eda63d8c7ad4.exe
Token: SeDebugPrivilege	2304	rmass.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 2364 wrote to memory of 2304	2364	NEAS.75fe7fab2515ee089305eda63d8c7ad4.exe	27
PID 2364 wrote to memory of 2304	2364	NEAS.75fe7fab2515ee089305eda63d8c7ad4.exe	27
PID 2364 wrote to memory of 2304	2364	NEAS.75fe7fab2515ee089305eda63d8c7ad4.exe	27
PID 2364 wrote to memory of 2304	2364	NEAS.75fe7fab2515ee089305eda63d8c7ad4.exe	27
PID 2304 wrote to memory of 420	2304	rmass.exe	3
PID 2304 wrote to memory of 1248	2304	rmass.exe	10
PID 2304 wrote to memory of 2132	2304	rmass.exe	28
PID 2304 wrote to memory of 2132	2304	rmass.exe	28
PID 2304 wrote to memory of 2132	2304	rmass.exe	28
PID 2304 wrote to memory of 2132	2304	rmass.exe	28

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:420

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:1248
- C:\Users\Admin\AppData\Local\Temp\NEAS.75fe7fab2515ee089305eda63d8c7ad4.exe
  "C:\Users\Admin\AppData\Local\Temp\NEAS.75fe7fab2515ee089305eda63d8c7ad4.exe"
  2⤵
  - Loads dropped DLL
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2364
- - 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
    - 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:2304
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:2132

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Defense Evasion

Impair Defenses

T1562

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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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
21KB

MD5
1320ef0f2b426d43eb72aa883235f3e1

SHA1
2db4ceb7e1625d01aee9ecb81cca29606afaf18d

SHA256
4284a58e300b66df9ff9318a5a195f0317a85c83346c7d9688a577d215b17940

SHA512
5e590337d89751fc0d70eb14ed92a4453b4789fbbb6c3dfdd55f193c9c0d5c02802ba4a7d453e6d64cba4ed1d13e31f14d95e9ff5b2cab86cf92b5e3117cdb86

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

Filesize
22KB

MD5
80a73410b8ae77ad7030acc49fdae67a

SHA1
080a3ba517f3ec8ac567ea6831e6556967516efc

SHA256
0416d3bcde40d41a01fe167af56fd69c0fb2fd54c53b5d52f0df068578f37022

SHA512
68567bf7865fc55adb3010aa164c17da37aba3d2be6ee86d29cdb25bc7b24e8ba6561680760a7ef377a028f031b0ea186b72717c9ca71b8d4bce8ef41b8b2ae9

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

Filesize
19KB

MD5
75fe7fab2515ee089305eda63d8c7ad4

SHA1
13ebdff519c6c5ae15822245cd37abac5c4112dd

SHA256
27d6cc2540bca54e844fa42543028f8df9ee6d28783147e37839cc99cc4286dc

SHA512
f626e836a14e483c8ad5b3e7a1cf57d0f86cf8e1d08d0ab2830c12395a5ffeb3da1cfc2a137ef59c7be914839d6cfa59cacb0c42ed4d77400faeccfec6a8bde6

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

Filesize
19KB

MD5
75fe7fab2515ee089305eda63d8c7ad4

SHA1
13ebdff519c6c5ae15822245cd37abac5c4112dd

SHA256
27d6cc2540bca54e844fa42543028f8df9ee6d28783147e37839cc99cc4286dc

SHA512
f626e836a14e483c8ad5b3e7a1cf57d0f86cf8e1d08d0ab2830c12395a5ffeb3da1cfc2a137ef59c7be914839d6cfa59cacb0c42ed4d77400faeccfec6a8bde6

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

Filesize
19KB

MD5
75fe7fab2515ee089305eda63d8c7ad4

SHA1
13ebdff519c6c5ae15822245cd37abac5c4112dd

SHA256
27d6cc2540bca54e844fa42543028f8df9ee6d28783147e37839cc99cc4286dc

SHA512
f626e836a14e483c8ad5b3e7a1cf57d0f86cf8e1d08d0ab2830c12395a5ffeb3da1cfc2a137ef59c7be914839d6cfa59cacb0c42ed4d77400faeccfec6a8bde6

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

Filesize
19KB

MD5
75fe7fab2515ee089305eda63d8c7ad4

SHA1
13ebdff519c6c5ae15822245cd37abac5c4112dd

SHA256
27d6cc2540bca54e844fa42543028f8df9ee6d28783147e37839cc99cc4286dc

SHA512
f626e836a14e483c8ad5b3e7a1cf57d0f86cf8e1d08d0ab2830c12395a5ffeb3da1cfc2a137ef59c7be914839d6cfa59cacb0c42ed4d77400faeccfec6a8bde6

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
19KB

MD5
75fe7fab2515ee089305eda63d8c7ad4

SHA1
13ebdff519c6c5ae15822245cd37abac5c4112dd

SHA256
27d6cc2540bca54e844fa42543028f8df9ee6d28783147e37839cc99cc4286dc

SHA512
f626e836a14e483c8ad5b3e7a1cf57d0f86cf8e1d08d0ab2830c12395a5ffeb3da1cfc2a137ef59c7be914839d6cfa59cacb0c42ed4d77400faeccfec6a8bde6

Download Submit
\Windows\SysWOW64\rmass.exe

Filesize
19KB

MD5
75fe7fab2515ee089305eda63d8c7ad4

SHA1
13ebdff519c6c5ae15822245cd37abac5c4112dd

SHA256
27d6cc2540bca54e844fa42543028f8df9ee6d28783147e37839cc99cc4286dc

SHA512
f626e836a14e483c8ad5b3e7a1cf57d0f86cf8e1d08d0ab2830c12395a5ffeb3da1cfc2a137ef59c7be914839d6cfa59cacb0c42ed4d77400faeccfec6a8bde6

Download Submit
\Windows\SysWOW64\rmass.exe

Filesize
19KB

MD5
75fe7fab2515ee089305eda63d8c7ad4

SHA1
13ebdff519c6c5ae15822245cd37abac5c4112dd

SHA256
27d6cc2540bca54e844fa42543028f8df9ee6d28783147e37839cc99cc4286dc

SHA512
f626e836a14e483c8ad5b3e7a1cf57d0f86cf8e1d08d0ab2830c12395a5ffeb3da1cfc2a137ef59c7be914839d6cfa59cacb0c42ed4d77400faeccfec6a8bde6

Download Submit
memory/2132-23-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2304-24-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2304-98-0x0000000000360000-0x0000000000371000-memory.dmp

Filesize
68KB

Download
memory/2364-0-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2364-10-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download