5586c5e1a139fffc4c11136a6d371a6173f363a46ee9f2b46e8fb9e7df363b74

Analysis

max time kernel
131s
max time network
135s
platform
windows10-2004_x64
resource
win10v2004-20220901-en
resource tags

arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
submitted
06-11-2022 08:10

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General

Target

printerfix/Win 2019/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:

icacls.exeicacls.exetakeown.exe

pid process

2728 icacls.exe
1040 icacls.exe
2200 takeown.exe

pid	process
2728	icacls.exe
1040	icacls.exe
2200	takeown.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\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	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\Appmon	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\USB Monitor	spoolsv.exe
Key created	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\Print\Monitors\WSD Port	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\WSPrint\OfflinePorts	spoolsv.exe
Key created	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\Print\Monitors\Appmon\Ports	spoolsv.exe

Loads dropped DLL 1 IoCs

Processes:

spoolsv.exe

pid process

3292 spoolsv.exe
Modifies file permissions 1 TTPs 3 IoCs
discovery

File Permissions Modification
T1222

Processes:

icacls.exeicacls.exetakeown.exe

pid process

2728 icacls.exe
1040 icacls.exe
2200 takeown.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
3292	spoolsv.exe

pid	process
2728	icacls.exe
1040	icacls.exe
2200	takeown.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_Msft&Prod_Virtual_DVD-ROM\2&1f4adffe&0&000002	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\Disk&Ven_DADY&Prod_HARDDISK\4&215468a5&0&000000\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_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
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&000002\Properties\{3b2ce006-5e61-4fde-bab8-9b8aac9b26df}\0002	spoolsv.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\CdRom&Ven_DADY&Prod_DADY_DVD-ROM\4&215468a5&0&010000	spoolsv.exe

Delays execution with timeout.exe 1 IoCs
evasion

Processes:

timeout.exe

pid process

3528 timeout.exe

pid	process
3528	timeout.exe

Modifies data under HKEY_USERS 18 IoCs

Processes:

spoolsv.exe

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

Runs net.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

takeown.exe

description pid process

Token: SeTakeOwnershipPrivilege 2200 takeown.exe

description	pid	process
Token: SeTakeOwnershipPrivilege	2200	takeown.exe

Suspicious use of WriteProcessMemory 18 IoCs

Processes:

cmd.exenet.exenet.exe

description	pid	process	target process
PID 3088 wrote to memory of 3244	3088	cmd.exe	net.exe
PID 3088 wrote to memory of 3244	3088	cmd.exe	net.exe
PID 3244 wrote to memory of 1664	3244	net.exe	net1.exe
PID 3244 wrote to memory of 1664	3244	net.exe	net1.exe
PID 3088 wrote to memory of 3528	3088	cmd.exe	timeout.exe
PID 3088 wrote to memory of 3528	3088	cmd.exe	timeout.exe
PID 3088 wrote to memory of 2200	3088	cmd.exe	takeown.exe
PID 3088 wrote to memory of 2200	3088	cmd.exe	takeown.exe
PID 3088 wrote to memory of 2728	3088	cmd.exe	icacls.exe
PID 3088 wrote to memory of 2728	3088	cmd.exe	icacls.exe
PID 3088 wrote to memory of 1040	3088	cmd.exe	icacls.exe
PID 3088 wrote to memory of 1040	3088	cmd.exe	icacls.exe
PID 3088 wrote to memory of 5108	3088	cmd.exe	reg.exe
PID 3088 wrote to memory of 5108	3088	cmd.exe	reg.exe
PID 3088 wrote to memory of 260	3088	cmd.exe	net.exe
PID 3088 wrote to memory of 260	3088	cmd.exe	net.exe
PID 260 wrote to memory of 116	260	net.exe	net1.exe
PID 260 wrote to memory of 116	260	net.exe	net1.exe

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\printerfix\Win 2019\Fix_PrintSpooler.bat"
1⤵
- Drops file in System32 directory
- Suspicious use of WriteProcessMemory
PID:3088

C:\Windows\system32\net.exe
net stop spooler
2⤵
- Suspicious use of WriteProcessMemory
PID:3244

C:\Windows\system32\net1.exe
C:\Windows\system32\net1 stop spooler
3⤵
PID:1664

C:\Windows\system32\timeout.exe
timeout /t 3 /nobreak
2⤵
- Delays execution with timeout.exe
PID:3528

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:2200

C:\Windows\system32\icacls.exe
icacls "C:\Windows\System32\win32spl.dll" /grant "administrators":F
2⤵
- Possible privilege escalation attempt
- Modifies file permissions
PID:2728

C:\Windows\system32\icacls.exe
icacls "C:\Windows\System32\win32spl.dll" /grant SYSTEM:F
2⤵
- Possible privilege escalation attempt
- Modifies file permissions
PID:1040

C:\Windows\system32\reg.exe
reg add "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Print" /v RpcAuthnLevelPrivacyEnabled /t REG_DWORD /d 0 /f
2⤵
PID:5108

C:\Windows\system32\net.exe
net start spooler
2⤵
- Suspicious use of WriteProcessMemory
PID:260

C:\Windows\system32\net1.exe
C:\Windows\system32\net1 start spooler
3⤵
PID:116

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:3292

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

File Permissions Modification

T1222

Credential Access

Discovery

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Windows\System32\win32spl.dll
Filesize
831KB

MD5
26327b93ebcad7bf061b63894923a78f

SHA1
4fc07b0cf4a9a54e5fdd71c33e329abe05b88823

SHA256
258058689cef565f5ab1938e1cfed2753bbf5ef2325ad5f8501afd932d42b53e

SHA512
fe0ac07985793ba1a0682ffc0375e07782b63588458d839293eeb5aa8d1cb0809f90051864f7620025bc49a67fd87720523fecaffb62ea895bec7f255a88199b

Download Submit
C:\Windows\System32\win32spl.dll
Filesize
831KB

MD5
26327b93ebcad7bf061b63894923a78f

SHA1
4fc07b0cf4a9a54e5fdd71c33e329abe05b88823

SHA256
258058689cef565f5ab1938e1cfed2753bbf5ef2325ad5f8501afd932d42b53e

SHA512
fe0ac07985793ba1a0682ffc0375e07782b63588458d839293eeb5aa8d1cb0809f90051864f7620025bc49a67fd87720523fecaffb62ea895bec7f255a88199b

Download Submit
memory/116-140-0x0000000000000000-mapping.dmp

Download
memory/260-139-0x0000000000000000-mapping.dmp

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memory/1040-137-0x0000000000000000-mapping.dmp

Download
memory/1664-133-0x0000000000000000-mapping.dmp

Download
memory/2200-135-0x0000000000000000-mapping.dmp

Download
memory/2728-136-0x0000000000000000-mapping.dmp

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memory/3244-132-0x0000000000000000-mapping.dmp

Download
memory/3528-134-0x0000000000000000-mapping.dmp

Download
memory/5108-138-0x0000000000000000-mapping.dmp

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