5586c5e1a139fffc4c11136a6d371a6173f363a46ee9f2b46e8fb9e7df363b74

Analysis

max time kernel
151s
max time network
156s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
06-11-2022 08:10

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General

Target

printerfix/LTSC/Fix_PrintSpooler.bat
Size

1KB
MD5

b4bcdad4dae1d57e6e38f81deb446e6e
SHA1

40509574224f0610c65e127cfc19f1664136d905
SHA256

7a7c4645e761205829d8c5490472b6d9371618ad5632ed96da29785496a0ee82
SHA512

696392c468fe0a0e9d168946c154eff1f08df839cd35fe27102b80eb66bd8f95d9c9f9375fd35372c154628e1a5dcd132d5c6a6842af7eaf501d51c61d34485c

Score

8^/10

discovery exploit persistence

Malware Config

Signatures

Possible privilege escalation attempt 3 IoCs
exploit

Processes:

takeown.exeicacls.exeicacls.exe

pid process

4724 takeown.exe
3376 icacls.exe
3656 icacls.exe

pid	process
4724	takeown.exe
3376	icacls.exe
3656	icacls.exe

Registers new Print Monitor 2 TTPs 12 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

spoolsv.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\Print\Monitors\USB Monitor	spoolsv.exe
Key created	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\Print\Monitors\WSD Port\Ports	spoolsv.exe
Key created	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\Print\Monitors\WSD Port\Adapters\IPP	spoolsv.exe
Key created	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\Print\Monitors\WSD Port\Adapters\WSPrint	spoolsv.exe
Key created	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\Print\Monitors\WSD Port\Adapters\WSPrint\OfflinePorts	spoolsv.exe
Key created	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\Print\Monitors\Standard TCP/IP Port	spoolsv.exe
Key created	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\Print\Monitors\Appmon\Ports	spoolsv.exe
Key created	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\Print\Monitors\Local Port	spoolsv.exe
Key created	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\Print\Monitors\Microsoft Shared Fax Monitor	spoolsv.exe
Key created	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\Print\Monitors\Standard TCP/IP Port\Ports	spoolsv.exe
Key created	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\Print\Monitors\WSD Port	spoolsv.exe
Key created	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\Print\Monitors\Appmon	spoolsv.exe

Loads dropped DLL 1 IoCs

Processes:

spoolsv.exe

pid process

3764 spoolsv.exe
Modifies file permissions 1 TTPs 3 IoCs
discovery

File and Directory Permissions Modification
T1222

Processes:

takeown.exeicacls.exeicacls.exe

pid process

4724 takeown.exe
3376 icacls.exe
3656 icacls.exe
Drops file in System32 directory 2 IoCs

Processes:

cmd.exe

description ioc process

File created C:\Windows\System32\win32spl.dll cmd.exe
File opened for modification C:\Windows\System32\win32spl.dll cmd.exe

pid	process
3764	spoolsv.exe

pid	process
4724	takeown.exe
3376	icacls.exe
3656	icacls.exe

description	ioc	process
File created	C:\Windows\System32\win32spl.dll	cmd.exe
File opened for modification	C:\Windows\System32\win32spl.dll	cmd.exe

Checks SCSI registry key(s) 3 TTPs 12 IoCs

SCSI information is often read in order to detect sandboxing environments.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

Processes:

spoolsv.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\CdRom&Ven_DADY&Prod_DADY_DVD-ROM\4&215468a5&0&010000	spoolsv.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_DADY&Prod_HARDDISK\4&215468a5&0&000000\Properties\{3b2ce006-5e61-4fde-bab8-9b8aac9b26df}\0002	spoolsv.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\CdRom&Ven_Msft&Prod_Virtual_DVD-ROM\2&1f4adffe&0&000002\HardwareID	spoolsv.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\CdRom&Ven_DADY&Prod_DADY_DVD-ROM\4&215468a5&0&010000\HardwareID	spoolsv.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\CdRom&Ven_Msft&Prod_Virtual_DVD-ROM\2&1f4adffe&0&000001	spoolsv.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\CdRom&Ven_Msft&Prod_Virtual_DVD-ROM\2&1f4adffe&0&000001\Properties\{3b2ce006-5e61-4fde-bab8-9b8aac9b26df}\0002	spoolsv.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\CdRom&Ven_Msft&Prod_Virtual_DVD-ROM\2&1f4adffe&0&000002	spoolsv.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\CdRom&Ven_Msft&Prod_Virtual_DVD-ROM\2&1f4adffe&0&000002\Properties\{3b2ce006-5e61-4fde-bab8-9b8aac9b26df}\0002	spoolsv.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_DADY&Prod_HARDDISK\4&215468a5&0&000000\HardwareID	spoolsv.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\CdRom&Ven_DADY&Prod_DADY_DVD-ROM\4&215468a5&0&010000\Properties\{3b2ce006-5e61-4fde-bab8-9b8aac9b26df}\0002	spoolsv.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_DADY&Prod_HARDDISK\4&215468a5&0&000000	spoolsv.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\CdRom&Ven_Msft&Prod_Virtual_DVD-ROM\2&1f4adffe&0&000001\HardwareID	spoolsv.exe

Delays execution with timeout.exe 1 IoCs
evasion

Processes:

timeout.exe

pid process

4448 timeout.exe

pid	process
4448	timeout.exe

Modifies data under HKEY_USERS 18 IoCs

Processes:

spoolsv.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-20\Software\Microsoft\Windows NT\CurrentVersion\Devices	spoolsv.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows NT\CurrentVersion\Devices	spoolsv.exe
Set value (str)	\REGISTRY\USER\S-1-5-19\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Devices\Fax = "winspool,Ne02:"	spoolsv.exe
Set value (str)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Devices\Microsoft XPS Document Writer = "winspool,Ne00:"	spoolsv.exe
Set value (str)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows NT\CurrentVersion\PrinterPorts\Microsoft Print to PDF = "winspool,Ne01:,15,45"	spoolsv.exe
Set value (str)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Devices\Fax = "winspool,Ne02:"	spoolsv.exe
Key created	\REGISTRY\USER\S-1-5-19\Software\Microsoft\Windows NT\CurrentVersion\Devices	spoolsv.exe
Set value (str)	\REGISTRY\USER\S-1-5-19\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Devices\Microsoft XPS Document Writer = "winspool,Ne00:"	spoolsv.exe
Set value (str)	\REGISTRY\USER\S-1-5-19\SOFTWARE\Microsoft\Windows NT\CurrentVersion\PrinterPorts\Microsoft Print to PDF = "winspool,Ne01:,15,45"	spoolsv.exe
Set value (str)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows NT\CurrentVersion\PrinterPorts\Fax = "winspool,Ne02:,15,45"	spoolsv.exe
Key created	\REGISTRY\USER\S-1-5-19\Software\Microsoft\Windows NT\CurrentVersion\PrinterPorts	spoolsv.exe
Key created	\REGISTRY\USER\S-1-5-20\Software\Microsoft\Windows NT\CurrentVersion\PrinterPorts	spoolsv.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows NT\CurrentVersion\PrinterPorts	spoolsv.exe
Set value (str)	\REGISTRY\USER\S-1-5-19\SOFTWARE\Microsoft\Windows NT\CurrentVersion\PrinterPorts\Microsoft XPS Document Writer = "winspool,Ne00:,15,45"	spoolsv.exe
Set value (str)	\REGISTRY\USER\S-1-5-19\SOFTWARE\Microsoft\Windows NT\CurrentVersion\PrinterPorts\Fax = "winspool,Ne02:,15,45"	spoolsv.exe
Set value (str)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Devices\Microsoft Print to PDF = "winspool,Ne01:"	spoolsv.exe
Set value (str)	\REGISTRY\USER\S-1-5-19\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Devices\Microsoft Print to PDF = "winspool,Ne01:"	spoolsv.exe
Set value (str)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows NT\CurrentVersion\PrinterPorts\Microsoft XPS Document Writer = "winspool,Ne00:,15,45"	spoolsv.exe

Runs net.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

takeown.exe

description pid process

Token: SeTakeOwnershipPrivilege 4724 takeown.exe

description	pid	process
Token: SeTakeOwnershipPrivilege	4724	takeown.exe

Suspicious use of WriteProcessMemory 18 IoCs

Processes:

cmd.exenet.exenet.exe

description	pid	process	target process
PID 3928 wrote to memory of 3408	3928	cmd.exe	net.exe
PID 3928 wrote to memory of 3408	3928	cmd.exe	net.exe
PID 3408 wrote to memory of 4240	3408	net.exe	net1.exe
PID 3408 wrote to memory of 4240	3408	net.exe	net1.exe
PID 3928 wrote to memory of 4448	3928	cmd.exe	timeout.exe
PID 3928 wrote to memory of 4448	3928	cmd.exe	timeout.exe
PID 3928 wrote to memory of 4724	3928	cmd.exe	takeown.exe
PID 3928 wrote to memory of 4724	3928	cmd.exe	takeown.exe
PID 3928 wrote to memory of 3376	3928	cmd.exe	icacls.exe
PID 3928 wrote to memory of 3376	3928	cmd.exe	icacls.exe
PID 3928 wrote to memory of 3656	3928	cmd.exe	icacls.exe
PID 3928 wrote to memory of 3656	3928	cmd.exe	icacls.exe
PID 3928 wrote to memory of 3620	3928	cmd.exe	reg.exe
PID 3928 wrote to memory of 3620	3928	cmd.exe	reg.exe
PID 3928 wrote to memory of 3964	3928	cmd.exe	net.exe
PID 3928 wrote to memory of 3964	3928	cmd.exe	net.exe
PID 3964 wrote to memory of 3144	3964	net.exe	net1.exe
PID 3964 wrote to memory of 3144	3964	net.exe	net1.exe

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\printerfix\LTSC\Fix_PrintSpooler.bat"
1⤵
- Drops file in System32 directory
- Suspicious use of WriteProcessMemory
PID:3928
- C:\Windows\system32\net.exe
  net stop spooler
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3408
- - C:\Windows\system32\net1.exe
    C:\Windows\system32\net1 stop spooler
    3⤵
    PID:4240
- C:\Windows\system32\timeout.exe
  timeout /t 3 /nobreak
  2⤵
  - Delays execution with timeout.exe
  PID:4448
- C:\Windows\system32\takeown.exe
  Takeown /A /F C:\Windows\System32\win32spl.dll
  2⤵
  - Possible privilege escalation attempt
  - Modifies file permissions
  - Suspicious use of AdjustPrivilegeToken
  PID:4724
- C:\Windows\system32\icacls.exe
  icacls "C:\Windows\System32\win32spl.dll" /grant "administrators":F
  2⤵
  - Possible privilege escalation attempt
  - Modifies file permissions
  PID:3376
- C:\Windows\system32\icacls.exe
  icacls "C:\Windows\System32\win32spl.dll" /grant SYSTEM:F
  2⤵
  - Possible privilege escalation attempt
  - Modifies file permissions
  PID:3656
- C:\Windows\system32\reg.exe
  reg add "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Print" /v RpcAuthnLevelPrivacyEnabled /t REG_DWORD /d 0 /f
  2⤵
  PID:3620
- C:\Windows\system32\net.exe
  net start spooler
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3964
- - C:\Windows\system32\net1.exe
    C:\Windows\system32\net1 start spooler
    3⤵
    PID:3144

C:\Windows\System32\spoolsv.exe
C:\Windows\System32\spoolsv.exe
1⤵
- Registers new Print Monitor
- Loads dropped DLL
- Checks SCSI registry key(s)
- Modifies data under HKEY_USERS
PID:3764

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

File and Directory Permissions Modification

T1222

Modify Registry

T1112

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Windows\System32\win32spl.dll

Filesize
828KB

MD5
937dddf8be82ae84d207b7dea83ec6fd

SHA1
df86817c4a95283fe19d3be966cbc37282b5cbdc

SHA256
40bc894b387c867e8264bf9a3d3910cd1693fc1c8cb557f1a460607bf67d53d0

SHA512
0c5641f3e3d6cac2bfd12a258d45d4270d43a5b89ca50ffb2a414a1b3aa24ae0d0319f21ed90776cd2d00fac59c29b80ba0fb5372c585df99805bdca04f1c4b8

Download Submit
C:\Windows\System32\win32spl.dll

Filesize
828KB

MD5
937dddf8be82ae84d207b7dea83ec6fd

SHA1
df86817c4a95283fe19d3be966cbc37282b5cbdc

SHA256
40bc894b387c867e8264bf9a3d3910cd1693fc1c8cb557f1a460607bf67d53d0

SHA512
0c5641f3e3d6cac2bfd12a258d45d4270d43a5b89ca50ffb2a414a1b3aa24ae0d0319f21ed90776cd2d00fac59c29b80ba0fb5372c585df99805bdca04f1c4b8

Download Submit
memory/3144-140-0x0000000000000000-mapping.dmp

Download
memory/3376-136-0x0000000000000000-mapping.dmp

Download
memory/3408-132-0x0000000000000000-mapping.dmp

Download
memory/3620-138-0x0000000000000000-mapping.dmp

Download
memory/3656-137-0x0000000000000000-mapping.dmp

Download
memory/3964-139-0x0000000000000000-mapping.dmp

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memory/4240-133-0x0000000000000000-mapping.dmp

Download
memory/4448-134-0x0000000000000000-mapping.dmp

Download
memory/4724-135-0x0000000000000000-mapping.dmp

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