5586c5e1a139fffc4c11136a6d371a6173f363a46ee9f2b46e8fb9e7df363b74

Analysis

max time kernel
130s
max time network
50s
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

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

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

1476 takeown.exe
1292 icacls.exe
2004 icacls.exe

pid	process
1476	takeown.exe
1292	icacls.exe
2004	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

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

File and Directory Permissions Modification
T1222

Processes:

takeown.exeicacls.exeicacls.exe

pid process

1476 takeown.exe
1292 icacls.exe
2004 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

1204 timeout.exe

pid	process
824	spoolsv.exe

pid	process
1476	takeown.exe
1292	icacls.exe
2004	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
1204	timeout.exe

Modifies data under HKEY_USERS 14 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-1-5-19\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
Key created	\REGISTRY\USER\.DEFAULT\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-1-5-20\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
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\PrinterPorts\Fax = "winspool,Ne01:,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-1-5-20\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

Runs net.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

Processes:

takeown.exespoolsv.exe

description	pid	process
Token: SeTakeOwnershipPrivilege	1476	takeown.exe
Token: SeRestorePrivilege	824	spoolsv.exe
Token: SeRestorePrivilege	824	spoolsv.exe
Token: SeRestorePrivilege	824	spoolsv.exe
Token: SeRestorePrivilege	824	spoolsv.exe
Token: SeRestorePrivilege	824	spoolsv.exe
Token: SeRestorePrivilege	824	spoolsv.exe
Token: SeRestorePrivilege	824	spoolsv.exe

Suspicious use of WriteProcessMemory 27 IoCs

Processes:

cmd.exenet.exenet.exe

description	pid	process	target process
PID 1760 wrote to memory of 480	1760	cmd.exe	net.exe
PID 1760 wrote to memory of 480	1760	cmd.exe	net.exe
PID 1760 wrote to memory of 480	1760	cmd.exe	net.exe
PID 480 wrote to memory of 888	480	net.exe	net1.exe
PID 480 wrote to memory of 888	480	net.exe	net1.exe
PID 480 wrote to memory of 888	480	net.exe	net1.exe
PID 1760 wrote to memory of 1204	1760	cmd.exe	timeout.exe
PID 1760 wrote to memory of 1204	1760	cmd.exe	timeout.exe
PID 1760 wrote to memory of 1204	1760	cmd.exe	timeout.exe
PID 1760 wrote to memory of 1476	1760	cmd.exe	takeown.exe
PID 1760 wrote to memory of 1476	1760	cmd.exe	takeown.exe
PID 1760 wrote to memory of 1476	1760	cmd.exe	takeown.exe
PID 1760 wrote to memory of 1292	1760	cmd.exe	icacls.exe
PID 1760 wrote to memory of 1292	1760	cmd.exe	icacls.exe
PID 1760 wrote to memory of 1292	1760	cmd.exe	icacls.exe
PID 1760 wrote to memory of 2004	1760	cmd.exe	icacls.exe
PID 1760 wrote to memory of 2004	1760	cmd.exe	icacls.exe
PID 1760 wrote to memory of 2004	1760	cmd.exe	icacls.exe
PID 1760 wrote to memory of 464	1760	cmd.exe	reg.exe
PID 1760 wrote to memory of 464	1760	cmd.exe	reg.exe
PID 1760 wrote to memory of 464	1760	cmd.exe	reg.exe
PID 1760 wrote to memory of 1924	1760	cmd.exe	net.exe
PID 1760 wrote to memory of 1924	1760	cmd.exe	net.exe
PID 1760 wrote to memory of 1924	1760	cmd.exe	net.exe
PID 1924 wrote to memory of 1580	1924	net.exe	net1.exe
PID 1924 wrote to memory of 1580	1924	net.exe	net1.exe
PID 1924 wrote to memory of 1580	1924	net.exe	net1.exe

C:\Windows\system32\cmd.exe
cmd /c "C:\Users\Admin\AppData\Local\Temp\printerfix\LTSC\Fix_PrintSpooler.bat"
1⤵
- Drops file in System32 directory
- Suspicious use of WriteProcessMemory
PID:1760
- C:\Windows\system32\net.exe
  net stop spooler
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:480
- - C:\Windows\system32\net1.exe
    C:\Windows\system32\net1 stop spooler
    3⤵
    PID:888
- C:\Windows\system32\timeout.exe
  timeout /t 3 /nobreak
  2⤵
  - Delays execution with timeout.exe
  PID:1204
- 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:1476
- C:\Windows\system32\icacls.exe
  icacls "C:\Windows\System32\win32spl.dll" /grant "administrators":F
  2⤵
  - Possible privilege escalation attempt
  - Modifies file permissions
  PID:1292
- C:\Windows\system32\icacls.exe
  icacls "C:\Windows\System32\win32spl.dll" /grant SYSTEM:F
  2⤵
  - Possible privilege escalation attempt
  - Modifies file permissions
  PID:2004
- C:\Windows\system32\reg.exe
  reg add "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Print" /v RpcAuthnLevelPrivacyEnabled /t REG_DWORD /d 0 /f
  2⤵
  PID:464
- C:\Windows\system32\net.exe
  net start spooler
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1924
- - C:\Windows\system32\net1.exe
    C:\Windows\system32\net1 start spooler
    3⤵
    PID:1580

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe shell32.dll,SHCreateLocalServerRunDll {995C996E-D918-4a8c-A302-45719A6F4EA7} -Embedding
1⤵
PID:1504

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:824

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

Loading Replay Monitor...

Downloads

C:\Windows\System32\win32spl.dll

Filesize
828KB

MD5
937dddf8be82ae84d207b7dea83ec6fd

SHA1
df86817c4a95283fe19d3be966cbc37282b5cbdc

SHA256
40bc894b387c867e8264bf9a3d3910cd1693fc1c8cb557f1a460607bf67d53d0

SHA512
0c5641f3e3d6cac2bfd12a258d45d4270d43a5b89ca50ffb2a414a1b3aa24ae0d0319f21ed90776cd2d00fac59c29b80ba0fb5372c585df99805bdca04f1c4b8

Download Submit
\Windows\System32\win32spl.dll

Filesize
828KB

MD5
937dddf8be82ae84d207b7dea83ec6fd

SHA1
df86817c4a95283fe19d3be966cbc37282b5cbdc

SHA256
40bc894b387c867e8264bf9a3d3910cd1693fc1c8cb557f1a460607bf67d53d0

SHA512
0c5641f3e3d6cac2bfd12a258d45d4270d43a5b89ca50ffb2a414a1b3aa24ae0d0319f21ed90776cd2d00fac59c29b80ba0fb5372c585df99805bdca04f1c4b8

Download Submit
memory/464-60-0x0000000000000000-mapping.dmp

Download
memory/480-54-0x0000000000000000-mapping.dmp

Download
memory/888-55-0x0000000000000000-mapping.dmp

Download
memory/1204-56-0x0000000000000000-mapping.dmp

Download
memory/1292-58-0x0000000000000000-mapping.dmp

Download
memory/1476-57-0x0000000000000000-mapping.dmp

Download
memory/1580-62-0x0000000000000000-mapping.dmp

Download
memory/1924-61-0x0000000000000000-mapping.dmp

Download
memory/2004-59-0x0000000000000000-mapping.dmp

Download