f1ba1c4001946a9008940deca301c236a8114457dd06e466274503ed324eb3f4

Bypass User Account Control

T1548.002

Disable or Modify Tools

Modify Registry

Processes:

W4.7.exefcsx.exe

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	W4.7.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	fcsx.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	fcsx.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	W4.7.exe

Windows security bypass 2 TTPs 2 IoCs

Disable or Modify Tools

Modify Registry

Processes:

W4.7.exefcsx.exe

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\UACDisableNotify = "0"	W4.7.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\UACDisableNotify = "0"	fcsx.exe

Deletes itself 1 IoCs

Processes:

cmd.exe

pid	Process
3024	cmd.exe

Executes dropped EXE 1 IoCs

Processes:

fcsx.exe

pid	Process
2384	fcsx.exe

Loads dropped DLL 1 IoCs

Processes:

W4.7.exe

pid	Process
1308	W4.7.exe

Windows security modification 2 TTPs 2 IoCs

Disable or Modify Tools

Modify Registry

Processes:

W4.7.exefcsx.exe

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\UACDisableNotify = "0"	W4.7.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\UACDisableNotify = "0"	fcsx.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

Processes:

W4.7.exe

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\fcsx.exe = "C:\\Windows\\WindowsUpdata\\fcsx.exe"	W4.7.exe

Checks whether UAC is enabled 1 TTPs 2 IoCs

System Information Discovery

T1082

Processes:

W4.7.exefcsx.exe

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	W4.7.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	fcsx.exe

Indicator Removal: File Deletion 1 TTPs
Adversaries may delete files left behind by the actions of their intrusion activity.
defense_evasion

File Deletion
T1070.004

UPX packed file 5 IoCs

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

upx

Processes:

resource	yara_rule
behavioral1/memory/1308-0-0x0000000000400000-0x0000000000425000-memory.dmp	upx
behavioral1/files/0x000700000001956c-3.dat	upx
behavioral1/memory/1308-7-0x0000000000400000-0x0000000000425000-memory.dmp	upx
behavioral1/memory/2384-9-0x0000000000400000-0x0000000000425000-memory.dmp	upx
behavioral1/memory/1308-14-0x0000000000400000-0x0000000000425000-memory.dmp	upx

Drops file in Windows directory 4 IoCs

Processes:

W4.7.exefcsx.exe

description	ioc	Process
File created	C:\Windows\WindowsUpdata\.temp.fortest	W4.7.exe
File created	C:\Windows\WindowsUpdata\fcsx.exe	W4.7.exe
File opened for modification	C:\Windows\WindowsUpdata\fcsx.exe	W4.7.exe
File created	C:\Windows\WindowsUpdata\.temp.fortest	fcsx.exe

System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

Processes:

fcsx.execmd.exeW4.7.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	fcsx.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	W4.7.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

W4.7.exefcsx.exe

description	pid	Process
Token: SeBackupPrivilege	1308	W4.7.exe
Token: SeBackupPrivilege	2384	fcsx.exe
Token: SeIncBasePriorityPrivilege	1308	W4.7.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

W4.7.exe

description	pid	Process	procid_target
PID 1308 wrote to memory of 2384	1308	W4.7.exe	29
PID 1308 wrote to memory of 2384	1308	W4.7.exe	29
PID 1308 wrote to memory of 2384	1308	W4.7.exe	29
PID 1308 wrote to memory of 2384	1308	W4.7.exe	29
PID 1308 wrote to memory of 3024	1308	W4.7.exe	30
PID 1308 wrote to memory of 3024	1308	W4.7.exe	30
PID 1308 wrote to memory of 3024	1308	W4.7.exe	30
PID 1308 wrote to memory of 3024	1308	W4.7.exe	30

System policy modification 1 TTPs 4 IoCs

evasion

Modify Registry

Processes:

W4.7.exefcsx.exe

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	W4.7.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	W4.7.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	fcsx.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	fcsx.exe

C:\Users\Admin\AppData\Local\Temp\W4.7.exe
"C:\Users\Admin\AppData\Local\Temp\W4.7.exe"
1⤵
- UAC bypass
- Windows security bypass
- Loads dropped DLL
- Windows security modification
- Adds Run key to start application
- Checks whether UAC is enabled
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- System policy modification
PID:1308
- C:\Windows\WindowsUpdata\fcsx.exe
  C:\Windows\WindowsUpdata\fcsx.exe
  2⤵
  - UAC bypass
  - Windows security bypass
  - Executes dropped EXE
  - Windows security modification
  - Checks whether UAC is enabled
  - Drops file in Windows directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - System policy modification
  PID:2384
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c del C:\Users\Admin\AppData\Local\Temp\W47~1.EXE > nul
  2⤵
  - Deletes itself
  - System Location Discovery: System Language Discovery
  PID:3024

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

Privilege Escalation

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Impair Defenses

3

T1562

Disable or Modify Tools

3

Indicator Removal

T1070

File Deletion

Modify Registry

Credential Access

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery