31b9ea45a54ae375bc316c1810ce1953cccdeecdb53f599fa31c2739df4bbd6d

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Schedule\ImagePath = "C:\\Windows\\system32\\drivers\\spools.exe"	f9829b33fdd63fca564aac7da5c096a9.exe

Modifies system executable filetype association 2 TTPs 1 IoCs

persistence

Modify Registry

Change Default File Association

T1546.001

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "C:\\Windows\\SysWow64\\drivers\\spools.exe \"%1\" %*"	f9829b33fdd63fca564aac7da5c096a9.exe

UPX packed file 3 IoCs

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

upx

resource	yara_rule
behavioral2/files/0x000300000001f45f-5.dat	upx
behavioral2/memory/3304-0-0x0000000000400000-0x0000000001564000-memory.dmp	upx
behavioral2/memory/3304-6-0x0000000000400000-0x0000000001564000-memory.dmp	upx

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1232405761-1209240240-3206092754-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\autoload = "C:\\Users\\Admin\\cftmon.exe"	f9829b33fdd63fca564aac7da5c096a9.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\ntuser = "C:\\Windows\\system32\\drivers\\spools.exe"	f9829b33fdd63fca564aac7da5c096a9.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\autoload = "C:\\Users\\Admin\\cftmon.exe"	f9829b33fdd63fca564aac7da5c096a9.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1232405761-1209240240-3206092754-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\ntuser = "C:\\Windows\\system32\\drivers\\spools.exe"	f9829b33fdd63fca564aac7da5c096a9.exe

Enumerates connected drives 3 TTPs 19 IoCs

Attempts to read the root path of hard drives other than the default C: drive.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	\??\E:	f9829b33fdd63fca564aac7da5c096a9.exe
File opened (read-only)	\??\M:	f9829b33fdd63fca564aac7da5c096a9.exe
File opened (read-only)	\??\V:	f9829b33fdd63fca564aac7da5c096a9.exe
File opened (read-only)	\??\X:	f9829b33fdd63fca564aac7da5c096a9.exe
File opened (read-only)	\??\Q:	f9829b33fdd63fca564aac7da5c096a9.exe
File opened (read-only)	\??\I:	f9829b33fdd63fca564aac7da5c096a9.exe
File opened (read-only)	\??\J:	f9829b33fdd63fca564aac7da5c096a9.exe
File opened (read-only)	\??\K:	f9829b33fdd63fca564aac7da5c096a9.exe
File opened (read-only)	\??\N:	f9829b33fdd63fca564aac7da5c096a9.exe
File opened (read-only)	\??\O:	f9829b33fdd63fca564aac7da5c096a9.exe
File opened (read-only)	\??\P:	f9829b33fdd63fca564aac7da5c096a9.exe
File opened (read-only)	\??\G:	f9829b33fdd63fca564aac7da5c096a9.exe
File opened (read-only)	\??\H:	f9829b33fdd63fca564aac7da5c096a9.exe
File opened (read-only)	\??\L:	f9829b33fdd63fca564aac7da5c096a9.exe
File opened (read-only)	\??\R:	f9829b33fdd63fca564aac7da5c096a9.exe
File opened (read-only)	\??\S:	f9829b33fdd63fca564aac7da5c096a9.exe
File opened (read-only)	\??\T:	f9829b33fdd63fca564aac7da5c096a9.exe
File opened (read-only)	\??\U:	f9829b33fdd63fca564aac7da5c096a9.exe
File opened (read-only)	\??\W:	f9829b33fdd63fca564aac7da5c096a9.exe

Modifies registry class 1 IoCs

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "C:\\Windows\\SysWow64\\drivers\\spools.exe \"%1\" %*"	f9829b33fdd63fca564aac7da5c096a9.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3304 wrote to memory of 5052	3304	f9829b33fdd63fca564aac7da5c096a9.exe	18
PID 3304 wrote to memory of 5052	3304	f9829b33fdd63fca564aac7da5c096a9.exe	18
PID 3304 wrote to memory of 5052	3304	f9829b33fdd63fca564aac7da5c096a9.exe	18
PID 3304 wrote to memory of 3180	3304	f9829b33fdd63fca564aac7da5c096a9.exe	20
PID 3304 wrote to memory of 3180	3304	f9829b33fdd63fca564aac7da5c096a9.exe	20
PID 3304 wrote to memory of 3180	3304	f9829b33fdd63fca564aac7da5c096a9.exe	20

C:\Users\Admin\AppData\Local\Temp\f9829b33fdd63fca564aac7da5c096a9.exe
"C:\Users\Admin\AppData\Local\Temp\f9829b33fdd63fca564aac7da5c096a9.exe"
1⤵
- Drops file in Drivers directory
- Sets service image path in registry
- Modifies system executable filetype association
- Adds Run key to start application
- Enumerates connected drives
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:3304
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c rmdir /S /Q "C:\Users\Admin\Cookies\"
  2⤵
  PID:5052
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c rmdir /S /Q "C:\Users\Admin\Application Data\Macromedia\Flash Player\"
  2⤵
  PID:3180

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

Event Triggered Execution

T1546

Change Default File Association

T1546.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

Event Triggered Execution

T1546

Change Default File Association

T1546.001

Defense Evasion

Modify Registry

3

Credential Access

Discovery

Peripheral Device Discovery

Query Registry

System Information Discovery