5457179ec6ed6bce1c5c11ed274409b2802fa3d7b220569301d47bee3971b405

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\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

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\{4D445554-5043-5741-4D44-555450435741}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4D445554-5043-5741-4D44-555450435741}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4D445554-5043-5741-4D44-555450435741}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4D445554-5043-5741-4D44-555450435741}\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
3516	rmass.exe
4196	rmass.exe

UPX packed file 7 IoCs

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

upx

resource	yara_rule
behavioral2/memory/1104-0-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/files/0x001000000001e746-5.dat	upx
behavioral2/files/0x001000000001e746-6.dat	upx
behavioral2/memory/1104-7-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/files/0x001000000001e746-16.dat	upx
behavioral2/memory/3516-41-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/4196-45-0x0000000000400000-0x0000000000411000-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	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
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\{BC84DF00-BC38-9902-8082-6FCBF2D87A0B}	rmass.exe

Drops file in System32 directory 12 IoCs

description	ioc	Process
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\rmass.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\winrnt.exe	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 opened for modification	C:\Windows\SysWOW64\rmass.exe	811581243c03c2d6a98d0b24bfec9e31_JC.exe
File created	C:\Windows\SysWOW64\rmass.exe	811581243c03c2d6a98d0b24bfec9e31_JC.exe
File opened for modification	C:\Windows\SysWOW64\ntdbg.exe	rmass.exe
File created	C:\Windows\SysWOW64\ntdbg.exe	rmass.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
3516	rmass.exe
3516	rmass.exe
3516	rmass.exe
3516	rmass.exe
3516	rmass.exe
3516	rmass.exe
4196	rmass.exe
4196	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1104	811581243c03c2d6a98d0b24bfec9e31_JC.exe
Token: SeDebugPrivilege	3516	rmass.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1104 wrote to memory of 3516	1104	811581243c03c2d6a98d0b24bfec9e31_JC.exe	85
PID 1104 wrote to memory of 3516	1104	811581243c03c2d6a98d0b24bfec9e31_JC.exe	85
PID 1104 wrote to memory of 3516	1104	811581243c03c2d6a98d0b24bfec9e31_JC.exe	85
PID 3516 wrote to memory of 612	3516	rmass.exe	3
PID 3516 wrote to memory of 3144	3516	rmass.exe	68
PID 3516 wrote to memory of 4196	3516	rmass.exe	86
PID 3516 wrote to memory of 4196	3516	rmass.exe	86
PID 3516 wrote to memory of 4196	3516	rmass.exe	86

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:612

C:\Users\Admin\AppData\Local\Temp\811581243c03c2d6a98d0b24bfec9e31_JC.exe
"C:\Users\Admin\AppData\Local\Temp\811581243c03c2d6a98d0b24bfec9e31_JC.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1104
- C:\Windows\SysWOW64\rmass.exe
  "C:\Windows\system32\rmass.exe"
  2⤵
  - 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:3516
- - C:\Windows\SysWOW64\rmass.exe
    --k33p
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    PID:4196

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:3144

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
21KB

MD5
3e606c7a5ca984af77152e774fd5b85b

SHA1
736dec2694ebd0dc20a50adeb8cb78ffd2e46c63

SHA256
b138c000252ee5aad97b076a4ffa843768fcdf26bd986e14d82188f21cec3cb6

SHA512
f50dbbd6b538e06ea60361a94fa0e59fae16f32592d5b5e1315897b0ed06c383661a2d3a8d641c2a7b8f4cadf9e8f6a948fc1024c87f85fabde3adf073a6864c

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

Filesize
22KB

MD5
5c7048491d7711fecd787ce4088b99f9

SHA1
591e71c1eeb2dd65f457de2d74ae8b351d613a70

SHA256
e39a84ff50f778986c35473961973cf4cd7100090391255e45d22dbc8762cd25

SHA512
04f5e3c86eb02169525d3d180f6d73312fc81570373707aac1f2909a4ec7c5e8cadeb8e93948e9758219d9b5d29f51411d074120cef9b344ded225206e8f88ad

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
6f47b62de25d1745e296a06b3f98ed19

SHA1
a688bb35a4c8a5cc198985d624a1b5a6ac5b9f6f

SHA256
15c7218eb9cef5fa0573db657b15ce3a5f0e0609f1166df8098ca7152df505b4

SHA512
dea26fff8060f44bf20fe4fff2ecbacf428727f10c0f5886fb4813e28fce9cbc3d088337c84edd9857b18514c83f1bb1cf0f51518aaecef09f30e921f4d758d7

Download Submit
memory/1104-0-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/1104-7-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/3516-41-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/4196-45-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads