5586c5e1a139fffc4c11136a6d371a6173f363a46ee9f2b46e8fb9e7df363b74

Analysis

max time kernel
134s
max time network
44s
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/Win 2016/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.exetakeown.exeicacls.exe

pid process

1648 icacls.exe
944 takeown.exe
1612 icacls.exe

pid	process
1648	icacls.exe
944	takeown.exe
1612	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

1092 spoolsv.exe
Modifies file permissions 1 TTPs 3 IoCs
discovery

File and Directory Permissions Modification
T1222

Processes:

takeown.exeicacls.exeicacls.exe

pid process

944 takeown.exe
1612 icacls.exe
1648 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

1416 timeout.exe

pid	process
1092	spoolsv.exe

pid	process
944	takeown.exe
1612	icacls.exe
1648	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
1416	timeout.exe

Modifies data under HKEY_USERS 14 IoCs

Processes:

spoolsv.exe

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

Runs net.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

Processes:

takeown.exespoolsv.exe

description	pid	process
Token: SeTakeOwnershipPrivilege	944	takeown.exe
Token: SeRestorePrivilege	1092	spoolsv.exe
Token: SeRestorePrivilege	1092	spoolsv.exe
Token: SeRestorePrivilege	1092	spoolsv.exe
Token: SeRestorePrivilege	1092	spoolsv.exe
Token: SeRestorePrivilege	1092	spoolsv.exe
Token: SeRestorePrivilege	1092	spoolsv.exe
Token: SeRestorePrivilege	1092	spoolsv.exe

Suspicious use of WriteProcessMemory 27 IoCs

Processes:

cmd.exenet.exenet.exe

description	pid	process	target process
PID 1132 wrote to memory of 1696	1132	cmd.exe	net.exe
PID 1132 wrote to memory of 1696	1132	cmd.exe	net.exe
PID 1132 wrote to memory of 1696	1132	cmd.exe	net.exe
PID 1696 wrote to memory of 1924	1696	net.exe	net1.exe
PID 1696 wrote to memory of 1924	1696	net.exe	net1.exe
PID 1696 wrote to memory of 1924	1696	net.exe	net1.exe
PID 1132 wrote to memory of 1416	1132	cmd.exe	timeout.exe
PID 1132 wrote to memory of 1416	1132	cmd.exe	timeout.exe
PID 1132 wrote to memory of 1416	1132	cmd.exe	timeout.exe
PID 1132 wrote to memory of 944	1132	cmd.exe	takeown.exe
PID 1132 wrote to memory of 944	1132	cmd.exe	takeown.exe
PID 1132 wrote to memory of 944	1132	cmd.exe	takeown.exe
PID 1132 wrote to memory of 1612	1132	cmd.exe	icacls.exe
PID 1132 wrote to memory of 1612	1132	cmd.exe	icacls.exe
PID 1132 wrote to memory of 1612	1132	cmd.exe	icacls.exe
PID 1132 wrote to memory of 1648	1132	cmd.exe	icacls.exe
PID 1132 wrote to memory of 1648	1132	cmd.exe	icacls.exe
PID 1132 wrote to memory of 1648	1132	cmd.exe	icacls.exe
PID 1132 wrote to memory of 588	1132	cmd.exe	reg.exe
PID 1132 wrote to memory of 588	1132	cmd.exe	reg.exe
PID 1132 wrote to memory of 588	1132	cmd.exe	reg.exe
PID 1132 wrote to memory of 1464	1132	cmd.exe	net.exe
PID 1132 wrote to memory of 1464	1132	cmd.exe	net.exe
PID 1132 wrote to memory of 1464	1132	cmd.exe	net.exe
PID 1464 wrote to memory of 1488	1464	net.exe	net1.exe
PID 1464 wrote to memory of 1488	1464	net.exe	net1.exe
PID 1464 wrote to memory of 1488	1464	net.exe	net1.exe

C:\Windows\system32\cmd.exe
cmd /c "C:\Users\Admin\AppData\Local\Temp\printerfix\Win 2016\Fix_PrintSpooler.bat"
1⤵
- Drops file in System32 directory
- Suspicious use of WriteProcessMemory
PID:1132
- C:\Windows\system32\net.exe
  net stop spooler
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1696
- - C:\Windows\system32\net1.exe
    C:\Windows\system32\net1 stop spooler
    3⤵
    PID:1924
- C:\Windows\system32\timeout.exe
  timeout /t 3 /nobreak
  2⤵
  - Delays execution with timeout.exe
  PID:1416
- 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:944
- C:\Windows\system32\icacls.exe
  icacls "C:\Windows\System32\win32spl.dll" /grant "administrators":F
  2⤵
  - Possible privilege escalation attempt
  - Modifies file permissions
  PID:1612
- C:\Windows\system32\icacls.exe
  icacls "C:\Windows\System32\win32spl.dll" /grant SYSTEM:F
  2⤵
  - Possible privilege escalation attempt
  - Modifies file permissions
  PID:1648
- C:\Windows\system32\reg.exe
  reg add "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Print" /v RpcAuthnLevelPrivacyEnabled /t REG_DWORD /d 0 /f
  2⤵
  PID:588
- C:\Windows\system32\net.exe
  net start spooler
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1464
- - C:\Windows\system32\net1.exe
    C:\Windows\system32\net1 start spooler
    3⤵
    PID:1488

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe shell32.dll,SHCreateLocalServerRunDll {995C996E-D918-4a8c-A302-45719A6F4EA7} -Embedding
1⤵
PID:1532

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:1092

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

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Windows\System32\win32spl.dll

Filesize
818KB

MD5
14e5d5013d1c11eafad5aff79795fce2

SHA1
33dbeb7cc68fd6fe048b2d5d505d105e9cbaaf52

SHA256
cdca1b6a9a10a594bf5a7d48c0fe480d8116145739c78ff2af7cbbbafb9aea06

SHA512
ba2593927eb76b8141eded1cb33671e115b000c899ee281569500b857300ef5105191c6399727c9cf3068b40e4081393dc5a7a51fd54850a975e5c290b06dccc

Download Submit
\Windows\System32\win32spl.dll

Filesize
818KB

MD5
14e5d5013d1c11eafad5aff79795fce2

SHA1
33dbeb7cc68fd6fe048b2d5d505d105e9cbaaf52

SHA256
cdca1b6a9a10a594bf5a7d48c0fe480d8116145739c78ff2af7cbbbafb9aea06

SHA512
ba2593927eb76b8141eded1cb33671e115b000c899ee281569500b857300ef5105191c6399727c9cf3068b40e4081393dc5a7a51fd54850a975e5c290b06dccc

Download Submit
memory/588-60-0x0000000000000000-mapping.dmp

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memory/944-57-0x0000000000000000-mapping.dmp

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memory/1416-56-0x0000000000000000-mapping.dmp

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memory/1464-61-0x0000000000000000-mapping.dmp

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memory/1488-62-0x0000000000000000-mapping.dmp

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memory/1612-58-0x0000000000000000-mapping.dmp

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memory/1648-59-0x0000000000000000-mapping.dmp

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memory/1696-54-0x0000000000000000-mapping.dmp

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memory/1924-55-0x0000000000000000-mapping.dmp

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