5586c5e1a139fffc4c11136a6d371a6173f363a46ee9f2b46e8fb9e7df363b74

Analysis

max time kernel
130s
max time network
42s
platform
windows7_x64
resource
win7-20220812-en
resource tags

arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
submitted
06-11-2022 08:10

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General

Target

printerfix/win7/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

1620 takeown.exe
1524 icacls.exe
1376 icacls.exe

pid	process
1620	takeown.exe
1524	icacls.exe
1376	icacls.exe

Registers new Print Monitor 2 TTPs 5 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\Standard TCP/IP Port\Ports	spoolsv.exe
Key created	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\Print\Monitors\WSD Port	spoolsv.exe

Loads dropped DLL 1 IoCs

Processes:

spoolsv.exe

pid process

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

File Permissions Modification
T1222

Processes:

takeown.exeicacls.exeicacls.exe

pid process

1620 takeown.exe
1524 icacls.exe
1376 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
Delays execution with timeout.exe 1 IoCs
evasion

Processes:

timeout.exe

pid process

1560 timeout.exe

pid	process
588	spoolsv.exe

pid	process
1620	takeown.exe
1524	icacls.exe
1376	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

pid	process
1560	timeout.exe

Modifies data under HKEY_USERS 14 IoCs

Processes:

spoolsv.exe

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

Runs net.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

Processes:

takeown.exespoolsv.exe

description	pid	process
Token: SeTakeOwnershipPrivilege	1620	takeown.exe
Token: SeRestorePrivilege	588	spoolsv.exe
Token: SeRestorePrivilege	588	spoolsv.exe
Token: SeRestorePrivilege	588	spoolsv.exe
Token: SeRestorePrivilege	588	spoolsv.exe
Token: SeRestorePrivilege	588	spoolsv.exe
Token: SeRestorePrivilege	588	spoolsv.exe
Token: SeRestorePrivilege	588	spoolsv.exe

Suspicious use of WriteProcessMemory 27 IoCs

Processes:

cmd.exenet.exenet.exe

description	pid	process	target process
PID 576 wrote to memory of 2044	576	cmd.exe	net.exe
PID 576 wrote to memory of 2044	576	cmd.exe	net.exe
PID 576 wrote to memory of 2044	576	cmd.exe	net.exe
PID 2044 wrote to memory of 1044	2044	net.exe	net1.exe
PID 2044 wrote to memory of 1044	2044	net.exe	net1.exe
PID 2044 wrote to memory of 1044	2044	net.exe	net1.exe
PID 576 wrote to memory of 1560	576	cmd.exe	timeout.exe
PID 576 wrote to memory of 1560	576	cmd.exe	timeout.exe
PID 576 wrote to memory of 1560	576	cmd.exe	timeout.exe
PID 576 wrote to memory of 1620	576	cmd.exe	takeown.exe
PID 576 wrote to memory of 1620	576	cmd.exe	takeown.exe
PID 576 wrote to memory of 1620	576	cmd.exe	takeown.exe
PID 576 wrote to memory of 1524	576	cmd.exe	icacls.exe
PID 576 wrote to memory of 1524	576	cmd.exe	icacls.exe
PID 576 wrote to memory of 1524	576	cmd.exe	icacls.exe
PID 576 wrote to memory of 1376	576	cmd.exe	icacls.exe
PID 576 wrote to memory of 1376	576	cmd.exe	icacls.exe
PID 576 wrote to memory of 1376	576	cmd.exe	icacls.exe
PID 576 wrote to memory of 1104	576	cmd.exe	reg.exe
PID 576 wrote to memory of 1104	576	cmd.exe	reg.exe
PID 576 wrote to memory of 1104	576	cmd.exe	reg.exe
PID 576 wrote to memory of 2040	576	cmd.exe	net.exe
PID 576 wrote to memory of 2040	576	cmd.exe	net.exe
PID 576 wrote to memory of 2040	576	cmd.exe	net.exe
PID 2040 wrote to memory of 1756	2040	net.exe	net1.exe
PID 2040 wrote to memory of 1756	2040	net.exe	net1.exe
PID 2040 wrote to memory of 1756	2040	net.exe	net1.exe

C:\Windows\system32\cmd.exe
cmd /c "C:\Users\Admin\AppData\Local\Temp\printerfix\win7\Fix_PrintSpooler.bat"
1⤵
- Drops file in System32 directory
- Suspicious use of WriteProcessMemory
PID:576

C:\Windows\system32\net.exe
net stop spooler
2⤵
- Suspicious use of WriteProcessMemory
PID:2044

C:\Windows\system32\net1.exe
C:\Windows\system32\net1 stop spooler
3⤵
PID:1044

C:\Windows\system32\timeout.exe
timeout /t 3 /nobreak
2⤵
- Delays execution with timeout.exe
PID:1560

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:1620

C:\Windows\system32\icacls.exe
icacls "C:\Windows\System32\win32spl.dll" /grant "administrators":F
2⤵
- Possible privilege escalation attempt
- Modifies file permissions
PID:1524

C:\Windows\system32\icacls.exe
icacls "C:\Windows\System32\win32spl.dll" /grant SYSTEM:F
2⤵
- Possible privilege escalation attempt
- Modifies file permissions
PID:1376

C:\Windows\system32\reg.exe
reg add "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Print" /v RpcAuthnLevelPrivacyEnabled /t REG_DWORD /d 0 /f
2⤵
PID:1104

C:\Windows\system32\net.exe
net start spooler
2⤵
- Suspicious use of WriteProcessMemory
PID:2040

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe shell32.dll,SHCreateLocalServerRunDll {995C996E-D918-4a8c-A302-45719A6F4EA7} -Embedding
1⤵
PID:980

C:\Windows\system32\net1.exe
C:\Windows\system32\net1 start spooler
1⤵
PID:1756

C:\Windows\System32\spoolsv.exe
C:\Windows\System32\spoolsv.exe
1⤵
- Registers new Print Monitor
- Loads dropped DLL
- Modifies data under HKEY_USERS
- Suspicious use of AdjustPrivilegeToken
PID:588

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

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Windows\System32\win32spl.dll
Filesize
743KB

MD5
6fc904493f366f0a10d6cd03a8c4b933

SHA1
c8cac1aa85ac7417ea64d3ad77b7c13ebc02f1f4

SHA256
81be67de5cbff88e8b950fc28a786dc64c8de80e9aba4438432ab9f1776af1aa

SHA512
ab438ed0b4c87825b0219050185892fbc1831c3343ef6bb03276fa02615b0e9ea8adb844a5f5fd617ba62560d99fc325246ad29c3e774840342f814c9a0dbfb7

Download Submit
\Windows\System32\win32spl.dll
Filesize
743KB

MD5
6fc904493f366f0a10d6cd03a8c4b933

SHA1
c8cac1aa85ac7417ea64d3ad77b7c13ebc02f1f4

SHA256
81be67de5cbff88e8b950fc28a786dc64c8de80e9aba4438432ab9f1776af1aa

SHA512
ab438ed0b4c87825b0219050185892fbc1831c3343ef6bb03276fa02615b0e9ea8adb844a5f5fd617ba62560d99fc325246ad29c3e774840342f814c9a0dbfb7

Download Submit
memory/1044-55-0x0000000000000000-mapping.dmp

Download
memory/1104-60-0x0000000000000000-mapping.dmp

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memory/1376-59-0x0000000000000000-mapping.dmp

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memory/1524-58-0x0000000000000000-mapping.dmp

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memory/1560-56-0x0000000000000000-mapping.dmp

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memory/1620-57-0x0000000000000000-mapping.dmp

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memory/1756-62-0x0000000000000000-mapping.dmp

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memory/2040-61-0x0000000000000000-mapping.dmp

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memory/2044-54-0x0000000000000000-mapping.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads