5586c5e1a139fffc4c11136a6d371a6173f363a46ee9f2b46e8fb9e7df363b74

Analysis

max time kernel
130s
max time network
49s
platform
windows7_x64
resource
win7-20220901-en
resource tags

arch:x64arch:x86image:win7-20220901-enlocale:en-usos:windows7-x64system
submitted
06-11-2022 08:10

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General

Target

printerfix/Win 2012/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

1872 takeown.exe
1464 icacls.exe
2000 icacls.exe

pid	process
1872	takeown.exe
1464	icacls.exe
2000	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

1820 spoolsv.exe
Modifies file permissions 1 TTPs 3 IoCs
discovery

File and Directory Permissions Modification
T1222

Processes:

takeown.exeicacls.exeicacls.exe

pid process

1872 takeown.exe
1464 icacls.exe
2000 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

2020 timeout.exe

pid	process
1820	spoolsv.exe

pid	process
1872	takeown.exe
1464	icacls.exe
2000	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
2020	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\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\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\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-1-5-20\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\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-1-5-20\Software\Microsoft\Windows NT\CurrentVersion\Devices\Fax = "winspool,Ne01:"	spoolsv.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows NT\CurrentVersion\PrinterPorts	spoolsv.exe

Runs net.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

Processes:

takeown.exespoolsv.exe

description	pid	process
Token: SeTakeOwnershipPrivilege	1872	takeown.exe
Token: SeRestorePrivilege	1820	spoolsv.exe
Token: SeRestorePrivilege	1820	spoolsv.exe
Token: SeRestorePrivilege	1820	spoolsv.exe
Token: SeRestorePrivilege	1820	spoolsv.exe
Token: SeRestorePrivilege	1820	spoolsv.exe
Token: SeRestorePrivilege	1820	spoolsv.exe
Token: SeRestorePrivilege	1820	spoolsv.exe

Suspicious use of WriteProcessMemory 27 IoCs

Processes:

cmd.exenet.exenet.exe

description	pid	process	target process
PID 2028 wrote to memory of 984	2028	cmd.exe	net.exe
PID 2028 wrote to memory of 984	2028	cmd.exe	net.exe
PID 2028 wrote to memory of 984	2028	cmd.exe	net.exe
PID 984 wrote to memory of 2008	984	net.exe	net1.exe
PID 984 wrote to memory of 2008	984	net.exe	net1.exe
PID 984 wrote to memory of 2008	984	net.exe	net1.exe
PID 2028 wrote to memory of 2020	2028	cmd.exe	timeout.exe
PID 2028 wrote to memory of 2020	2028	cmd.exe	timeout.exe
PID 2028 wrote to memory of 2020	2028	cmd.exe	timeout.exe
PID 2028 wrote to memory of 1872	2028	cmd.exe	takeown.exe
PID 2028 wrote to memory of 1872	2028	cmd.exe	takeown.exe
PID 2028 wrote to memory of 1872	2028	cmd.exe	takeown.exe
PID 2028 wrote to memory of 1464	2028	cmd.exe	icacls.exe
PID 2028 wrote to memory of 1464	2028	cmd.exe	icacls.exe
PID 2028 wrote to memory of 1464	2028	cmd.exe	icacls.exe
PID 2028 wrote to memory of 2000	2028	cmd.exe	icacls.exe
PID 2028 wrote to memory of 2000	2028	cmd.exe	icacls.exe
PID 2028 wrote to memory of 2000	2028	cmd.exe	icacls.exe
PID 2028 wrote to memory of 1728	2028	cmd.exe	reg.exe
PID 2028 wrote to memory of 1728	2028	cmd.exe	reg.exe
PID 2028 wrote to memory of 1728	2028	cmd.exe	reg.exe
PID 2028 wrote to memory of 1580	2028	cmd.exe	net.exe
PID 2028 wrote to memory of 1580	2028	cmd.exe	net.exe
PID 2028 wrote to memory of 1580	2028	cmd.exe	net.exe
PID 1580 wrote to memory of 336	1580	net.exe	net1.exe
PID 1580 wrote to memory of 336	1580	net.exe	net1.exe
PID 1580 wrote to memory of 336	1580	net.exe	net1.exe

C:\Windows\system32\cmd.exe
cmd /c "C:\Users\Admin\AppData\Local\Temp\printerfix\Win 2012\Fix_PrintSpooler.bat"
1⤵
- Drops file in System32 directory
- Suspicious use of WriteProcessMemory
PID:2028
- C:\Windows\system32\net.exe
  net stop spooler
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:984
- - C:\Windows\system32\net1.exe
    C:\Windows\system32\net1 stop spooler
    3⤵
    PID:2008
- C:\Windows\system32\timeout.exe
  timeout /t 3 /nobreak
  2⤵
  - Delays execution with timeout.exe
  PID:2020
- 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:1872
- C:\Windows\system32\icacls.exe
  icacls "C:\Windows\System32\win32spl.dll" /grant "administrators":F
  2⤵
  - Possible privilege escalation attempt
  - Modifies file permissions
  PID:1464
- C:\Windows\system32\icacls.exe
  icacls "C:\Windows\System32\win32spl.dll" /grant SYSTEM:F
  2⤵
  - Possible privilege escalation attempt
  - Modifies file permissions
  PID:2000
- C:\Windows\system32\reg.exe
  reg add "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Print" /v RpcAuthnLevelPrivacyEnabled /t REG_DWORD /d 0 /f
  2⤵
  PID:1728
- C:\Windows\system32\net.exe
  net start spooler
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1580
- - C:\Windows\system32\net1.exe
    C:\Windows\system32\net1 start spooler
    3⤵
    PID:336

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe shell32.dll,SHCreateLocalServerRunDll {995C996E-D918-4a8c-A302-45719A6F4EA7} -Embedding
1⤵
PID:1372

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:1820

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
849KB

MD5
501ff59564283bd160341c7f99c6c81a

SHA1
fdc6d92a23f3d75dd9ae4ab613a7f052d526114d

SHA256
f04fc42a91b517b6b6f57fea03e9c1b23ccde3b9fdc9bcb537ee09d552c602b9

SHA512
d4c0174ace128d976432a7264c9f4a1c74305f9ba00d1127feb479ebf9ac5fd056ffcab91275d2a0fa4dd46018a55546a8a8b7073b497528819c39d81e476904

Download Submit
\Windows\System32\win32spl.dll

Filesize
849KB

MD5
501ff59564283bd160341c7f99c6c81a

SHA1
fdc6d92a23f3d75dd9ae4ab613a7f052d526114d

SHA256
f04fc42a91b517b6b6f57fea03e9c1b23ccde3b9fdc9bcb537ee09d552c602b9

SHA512
d4c0174ace128d976432a7264c9f4a1c74305f9ba00d1127feb479ebf9ac5fd056ffcab91275d2a0fa4dd46018a55546a8a8b7073b497528819c39d81e476904

Download Submit
memory/336-62-0x0000000000000000-mapping.dmp

Download
memory/984-54-0x0000000000000000-mapping.dmp

Download
memory/1464-58-0x0000000000000000-mapping.dmp

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memory/1580-61-0x0000000000000000-mapping.dmp

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memory/1728-60-0x0000000000000000-mapping.dmp

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memory/1872-57-0x0000000000000000-mapping.dmp

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memory/2000-59-0x0000000000000000-mapping.dmp

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memory/2008-55-0x0000000000000000-mapping.dmp

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memory/2020-56-0x0000000000000000-mapping.dmp

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