vobfus | 64eadf74265abba1c15d8def349e9ba62124b7013c8a0d9dc45ece27d0063a69

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\run	64eadf74265abba1c15d8def349e9ba62124b7013c8a0d9dc45ece27d0063a69N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\run\WindowsDefender = "C:\\Users\\Admin\\AppData\\Roaming\\windefender.exe"	64eadf74265abba1c15d8def349e9ba62124b7013c8a0d9dc45ece27d0063a69N.exe
Key created	\REGISTRY\USER\S-1-5-21-4050598569-1597076380-177084960-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\run	64eadf74265abba1c15d8def349e9ba62124b7013c8a0d9dc45ece27d0063a69N.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-4050598569-1597076380-177084960-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\run\WindowsDefender = "C:\\Users\\Admin\\AppData\\Roaming\\windefender.exe"	64eadf74265abba1c15d8def349e9ba62124b7013c8a0d9dc45ece27d0063a69N.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\WindowsDefender = "C:\\Users\\Admin\\AppData\\Roaming\\windefender.exe"	64eadf74265abba1c15d8def349e9ba62124b7013c8a0d9dc45ece27d0063a69N.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-4050598569-1597076380-177084960-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WindowsDefender = "C:\\Users\\Admin\\AppData\\Roaming\\windefender.exe"	64eadf74265abba1c15d8def349e9ba62124b7013c8a0d9dc45ece27d0063a69N.exe

Drops autorun.inf file 1 TTPs 2 IoCs

Malware can abuse Windows Autorun to spread further via attached volumes.

Replication Through Removable Media

T1091

description	ioc	Process
File created	D:\Autorun.inf	64eadf74265abba1c15d8def349e9ba62124b7013c8a0d9dc45ece27d0063a69N.exe
File created	F:\Autorun.inf	64eadf74265abba1c15d8def349e9ba62124b7013c8a0d9dc45ece27d0063a69N.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3460 set thread context of 2996	3460	64eadf74265abba1c15d8def349e9ba62124b7013c8a0d9dc45ece27d0063a69N.exe	87

UPX packed file 6 IoCs

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

upx

resource	yara_rule
behavioral2/memory/2996-2-0x0000000000400000-0x000000000042E000-memory.dmp	upx
behavioral2/memory/2996-5-0x0000000000400000-0x000000000042E000-memory.dmp	upx
behavioral2/memory/2996-8-0x0000000000400000-0x000000000042E000-memory.dmp	upx
behavioral2/memory/2996-13-0x0000000000400000-0x000000000042E000-memory.dmp	upx
behavioral2/memory/2996-16-0x0000000000400000-0x000000000042E000-memory.dmp	upx
behavioral2/memory/2996-17-0x0000000000400000-0x000000000042E000-memory.dmp	upx

System Location Discovery: System Language Discovery 1 TTPs 2 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

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	64eadf74265abba1c15d8def349e9ba62124b7013c8a0d9dc45ece27d0063a69N.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	64eadf74265abba1c15d8def349e9ba62124b7013c8a0d9dc45ece27d0063a69N.exe

Script User-Agent 1 IoCs

Uses user-agent string associated with script host/environment.

description	flow	ioc
HTTP User-Agent header	22	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)

Suspicious behavior: RenamesItself 1 IoCs

pid	Process
2996	64eadf74265abba1c15d8def349e9ba62124b7013c8a0d9dc45ece27d0063a69N.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2996	64eadf74265abba1c15d8def349e9ba62124b7013c8a0d9dc45ece27d0063a69N.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 3460 wrote to memory of 2996	3460	64eadf74265abba1c15d8def349e9ba62124b7013c8a0d9dc45ece27d0063a69N.exe	87
PID 3460 wrote to memory of 2996	3460	64eadf74265abba1c15d8def349e9ba62124b7013c8a0d9dc45ece27d0063a69N.exe	87
PID 3460 wrote to memory of 2996	3460	64eadf74265abba1c15d8def349e9ba62124b7013c8a0d9dc45ece27d0063a69N.exe	87
PID 3460 wrote to memory of 2996	3460	64eadf74265abba1c15d8def349e9ba62124b7013c8a0d9dc45ece27d0063a69N.exe	87
PID 3460 wrote to memory of 2996	3460	64eadf74265abba1c15d8def349e9ba62124b7013c8a0d9dc45ece27d0063a69N.exe	87
PID 3460 wrote to memory of 2996	3460	64eadf74265abba1c15d8def349e9ba62124b7013c8a0d9dc45ece27d0063a69N.exe	87
PID 3460 wrote to memory of 2996	3460	64eadf74265abba1c15d8def349e9ba62124b7013c8a0d9dc45ece27d0063a69N.exe	87
PID 3460 wrote to memory of 2996	3460	64eadf74265abba1c15d8def349e9ba62124b7013c8a0d9dc45ece27d0063a69N.exe	87

C:\Users\Admin\AppData\Local\Temp\64eadf74265abba1c15d8def349e9ba62124b7013c8a0d9dc45ece27d0063a69N.exe
"C:\Users\Admin\AppData\Local\Temp\64eadf74265abba1c15d8def349e9ba62124b7013c8a0d9dc45ece27d0063a69N.exe"
1⤵
- Drops autorun.inf file
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3460
- C:\Users\Admin\AppData\Local\Temp\64eadf74265abba1c15d8def349e9ba62124b7013c8a0d9dc45ece27d0063a69N.exe
  "C:\Users\Admin\AppData\Local\Temp\64eadf74265abba1c15d8def349e9ba62124b7013c8a0d9dc45ece27d0063a69N.exe"
  2⤵
  - Adds policy Run key to start application
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: RenamesItself
  - Suspicious use of SetWindowsHookEx
  PID:2996

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Replication Through Removable Media

T1091

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Replication Through Removable Media