5457179ec6ed6bce1c5c11ed274409b2802fa3d7b220569301d47bee3971b405

Analysis

max time kernel
149s
max time network
144s
platform
windows7_x64
resource
win7-20230831-en
resource tags

arch:x64arch:x86image:win7-20230831-enlocale:en-usos:windows7-x64system
submitted
05/10/2023, 18:49

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General

Target

811581243c03c2d6a98d0b24bfec9e31_JC.exe
Size

19KB
MD5

811581243c03c2d6a98d0b24bfec9e31
SHA1

77cf93cd3f857f59c22c6d6f13770e33672f7777
SHA256

5457179ec6ed6bce1c5c11ed274409b2802fa3d7b220569301d47bee3971b405
SHA512

93b70881b103fa8af9edb24054b4e6b658443202fb74ee162d8fb239c08a3eeaf1d973f49d03569ac21dcc9cbd426d5a4b379c556d8d84337799f828a3608b4f
SSDEEP

384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvXfy:rRkiLw3HsDSARGG/q

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\{4E475451-4752-4d4c-4E47-545147524d4c}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4E475451-4752-4d4c-4E47-545147524d4c}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4E475451-4752-4d4c-4E47-545147524d4c}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4E475451-4752-4d4c-4E47-545147524d4c}\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
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exe\Debugger = "C:\\Windows\\system32\\ntdbg.exe"	rmass.exe
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

Executes dropped EXE 2 IoCs

pid	Process
2912	rmass.exe
2780	rmass.exe

Loads dropped DLL 3 IoCs

pid	Process
2252	811581243c03c2d6a98d0b24bfec9e31_JC.exe
2252	811581243c03c2d6a98d0b24bfec9e31_JC.exe
2912	rmass.exe

UPX packed file 12 IoCs

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

upx

resource	yara_rule
behavioral1/memory/2252-0-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/files/0x00070000000120bd-4.dat	upx
behavioral1/files/0x00070000000120bd-13.dat	upx
behavioral1/files/0x00070000000120bd-12.dat	upx
behavioral1/files/0x00070000000120bd-22.dat	upx
behavioral1/memory/2252-10-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/files/0x00070000000120bd-7.dat	upx
behavioral1/files/0x00070000000120bd-6.dat	upx
behavioral1/files/0x00070000000120bd-23.dat	upx
behavioral1/memory/2780-24-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2912-25-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2912-57-0x0000000000400000-0x0000000000411000-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\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

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\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 opened for modification	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 created	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\rmass.exe	811581243c03c2d6a98d0b24bfec9e31_JC.exe
File created	C:\Windows\SysWOW64\rmass.exe	811581243c03c2d6a98d0b24bfec9e31_JC.exe
File created	C:\Windows\SysWOW64\ntdbg.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\RECOVER32.DLL	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 4 IoCs

pid	Process
2912	rmass.exe
2912	rmass.exe
2912	rmass.exe
2780	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2252	811581243c03c2d6a98d0b24bfec9e31_JC.exe
Token: SeDebugPrivilege	2912	rmass.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 2252 wrote to memory of 2912	2252	811581243c03c2d6a98d0b24bfec9e31_JC.exe	28
PID 2252 wrote to memory of 2912	2252	811581243c03c2d6a98d0b24bfec9e31_JC.exe	28
PID 2252 wrote to memory of 2912	2252	811581243c03c2d6a98d0b24bfec9e31_JC.exe	28
PID 2252 wrote to memory of 2912	2252	811581243c03c2d6a98d0b24bfec9e31_JC.exe	28
PID 2912 wrote to memory of 420	2912	rmass.exe	4
PID 2912 wrote to memory of 1216	2912	rmass.exe	16
PID 2912 wrote to memory of 2780	2912	rmass.exe	29
PID 2912 wrote to memory of 2780	2912	rmass.exe	29
PID 2912 wrote to memory of 2780	2912	rmass.exe	29
PID 2912 wrote to memory of 2780	2912	rmass.exe	29

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

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:1216
- C:\Users\Admin\AppData\Local\Temp\811581243c03c2d6a98d0b24bfec9e31_JC.exe
  "C:\Users\Admin\AppData\Local\Temp\811581243c03c2d6a98d0b24bfec9e31_JC.exe"
  2⤵
  - Loads dropped DLL
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2252
- - 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:2912
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:2780

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
0716bd9f3e1d9549693aad7d8251f1b0

SHA1
266d346ab79af8b3d87004431dc78d72869b38d9

SHA256
ce40d8757566e0295e2a660c7b8afb054743b3419c9f0bd3e848e63f95ef866b

SHA512
42677c9162b2ad5b52ea98f9e39f725d1c7192996b6f67eaf727481fa40b749d0c7ae80529ead9b14f53fb15d832a91e33a81b826a60f3d4c856ce915cc7af65

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

Filesize
22KB

MD5
034f41df90c521525d69cd82e2bc6ce5

SHA1
4201c4274f9b73a9d84d2130f6a0ab2f075cb9f8

SHA256
825055de35a124c366b8b9c6d1b26ce17f9cd3c0b57c9edd5f29dbd903359ae0

SHA512
f56a26ca02cc067850068765426cac91d48aa359a57657da4a2a67c56b6acf639d6fa9d34889acc03d930661c9a87a821f8b58ac150d1b529d50d3f2c4c527cc

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

Filesize
19KB

MD5
811581243c03c2d6a98d0b24bfec9e31

SHA1
77cf93cd3f857f59c22c6d6f13770e33672f7777

SHA256
5457179ec6ed6bce1c5c11ed274409b2802fa3d7b220569301d47bee3971b405

SHA512
93b70881b103fa8af9edb24054b4e6b658443202fb74ee162d8fb239c08a3eeaf1d973f49d03569ac21dcc9cbd426d5a4b379c556d8d84337799f828a3608b4f

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

Filesize
19KB

MD5
811581243c03c2d6a98d0b24bfec9e31

SHA1
77cf93cd3f857f59c22c6d6f13770e33672f7777

SHA256
5457179ec6ed6bce1c5c11ed274409b2802fa3d7b220569301d47bee3971b405

SHA512
93b70881b103fa8af9edb24054b4e6b658443202fb74ee162d8fb239c08a3eeaf1d973f49d03569ac21dcc9cbd426d5a4b379c556d8d84337799f828a3608b4f

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

Filesize
19KB

MD5
811581243c03c2d6a98d0b24bfec9e31

SHA1
77cf93cd3f857f59c22c6d6f13770e33672f7777

SHA256
5457179ec6ed6bce1c5c11ed274409b2802fa3d7b220569301d47bee3971b405

SHA512
93b70881b103fa8af9edb24054b4e6b658443202fb74ee162d8fb239c08a3eeaf1d973f49d03569ac21dcc9cbd426d5a4b379c556d8d84337799f828a3608b4f

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

Filesize
19KB

MD5
811581243c03c2d6a98d0b24bfec9e31

SHA1
77cf93cd3f857f59c22c6d6f13770e33672f7777

SHA256
5457179ec6ed6bce1c5c11ed274409b2802fa3d7b220569301d47bee3971b405

SHA512
93b70881b103fa8af9edb24054b4e6b658443202fb74ee162d8fb239c08a3eeaf1d973f49d03569ac21dcc9cbd426d5a4b379c556d8d84337799f828a3608b4f

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
811581243c03c2d6a98d0b24bfec9e31

SHA1
77cf93cd3f857f59c22c6d6f13770e33672f7777

SHA256
5457179ec6ed6bce1c5c11ed274409b2802fa3d7b220569301d47bee3971b405

SHA512
93b70881b103fa8af9edb24054b4e6b658443202fb74ee162d8fb239c08a3eeaf1d973f49d03569ac21dcc9cbd426d5a4b379c556d8d84337799f828a3608b4f

Download Submit
\Windows\SysWOW64\rmass.exe

Filesize
19KB

MD5
811581243c03c2d6a98d0b24bfec9e31

SHA1
77cf93cd3f857f59c22c6d6f13770e33672f7777

SHA256
5457179ec6ed6bce1c5c11ed274409b2802fa3d7b220569301d47bee3971b405

SHA512
93b70881b103fa8af9edb24054b4e6b658443202fb74ee162d8fb239c08a3eeaf1d973f49d03569ac21dcc9cbd426d5a4b379c556d8d84337799f828a3608b4f

Download Submit
\Windows\SysWOW64\rmass.exe

Filesize
19KB

MD5
811581243c03c2d6a98d0b24bfec9e31

SHA1
77cf93cd3f857f59c22c6d6f13770e33672f7777

SHA256
5457179ec6ed6bce1c5c11ed274409b2802fa3d7b220569301d47bee3971b405

SHA512
93b70881b103fa8af9edb24054b4e6b658443202fb74ee162d8fb239c08a3eeaf1d973f49d03569ac21dcc9cbd426d5a4b379c556d8d84337799f828a3608b4f

Download Submit
memory/2252-10-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2252-11-0x00000000003C0000-0x00000000003D1000-memory.dmp

Filesize
68KB

Download
memory/2252-0-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2252-50-0x00000000003C0000-0x00000000003D1000-memory.dmp

Filesize
68KB

Download
memory/2780-24-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2912-25-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2912-57-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2912-59-0x00000000003A0000-0x00000000003B1000-memory.dmp

Filesize
68KB

Download