bd88cf8c700d7064f3738f7349dab2224b9ff4eae69bd2459f35d19c4cf78063

Processes:

explorer.exesvchost.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\shell = "C:\\Windows\\explorer.exe, c:\\windows\\system\\explorer.exe"	explorer.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\shell = "C:\\Windows\\explorer.exe, c:\\windows\\system\\explorer.exe"	svchost.exe

Modifies visiblity of hidden/system files in Explorer 2 TTPs 2 IoCs

evasion

Hidden Files and Directories

T1564.001

Modify Registry

Processes:

explorer.exesvchost.exe

description	ioc	process
Set value (int)	\REGISTRY\USER\S-1-5-21-2804150937-2146708401-419095071-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	explorer.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2804150937-2146708401-419095071-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	svchost.exe

UPX dump on OEP (original entry point) 14 IoCs

Processes:

resource	yara_rule
behavioral2/memory/5092-0-0x0000000000400000-0x0000000000434000-memory.dmp	UPX
\??\c:\windows\system\explorer.exe	UPX
behavioral2/memory/3584-9-0x0000000000400000-0x0000000000434000-memory.dmp	UPX
C:\Windows\System\spoolsv.exe	UPX
behavioral2/memory/3956-19-0x0000000000400000-0x0000000000434000-memory.dmp	UPX
C:\Windows\System\svchost.exe	UPX
behavioral2/memory/3372-27-0x0000000000400000-0x0000000000434000-memory.dmp	UPX
behavioral2/memory/4856-38-0x0000000000400000-0x0000000000434000-memory.dmp	UPX
behavioral2/memory/3956-40-0x0000000000400000-0x0000000000434000-memory.dmp	UPX
behavioral2/memory/5092-42-0x0000000000400000-0x0000000000434000-memory.dmp	UPX
C:\Users\Admin\AppData\Roaming\mrsys.exe	UPX
behavioral2/memory/3584-44-0x0000000000400000-0x0000000000434000-memory.dmp	UPX
behavioral2/memory/3372-45-0x0000000000400000-0x0000000000434000-memory.dmp	UPX
behavioral2/memory/3584-54-0x0000000000400000-0x0000000000434000-memory.dmp	UPX

Modifies Installed Components in the registry 2 TTPs 8 IoCs

persistence

Registry Run Keys / Startup Folder

Modify Registry

Processes:

svchost.exeexplorer.exe

description	ioc	process
Key deleted	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{F146C9B1-VMVQ-A9RC-NUFL-D0BA00B4E999}	svchost.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Active Setup\Installed Components\{Y479C6D0-OTRW-U5GH-S1EE-E0AC10B4E666}	explorer.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{Y479C6D0-OTRW-U5GH-S1EE-E0AC10B4E666}\StubPath = "C:\\Users\\Admin\\AppData\\Roaming\\mrsys.exe MR"	explorer.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Active Setup\Installed Components\{F146C9B1-VMVQ-A9RC-NUFL-D0BA00B4E999}	svchost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{F146C9B1-VMVQ-A9RC-NUFL-D0BA00B4E999}\StubPath = "C:\\Users\\Admin\\AppData\\Roaming\\mrsys.exe MR"	svchost.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{Y479C6D0-OTRW-U5GH-S1EE-E0AC10B4E666}	svchost.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Active Setup\Installed Components\{Y479C6D0-OTRW-U5GH-S1EE-E0AC10B4E666}	svchost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{Y479C6D0-OTRW-U5GH-S1EE-E0AC10B4E666}\StubPath = "C:\\Users\\Admin\\AppData\\Roaming\\mrsys.exe MR"	svchost.exe

Executes dropped EXE 4 IoCs

Processes:

explorer.exespoolsv.exesvchost.exespoolsv.exe

pid process

3584 explorer.exe
3956 spoolsv.exe
3372 svchost.exe
4856 spoolsv.exe

pid	process
3584	explorer.exe
3956	spoolsv.exe
3372	svchost.exe
4856	spoolsv.exe

UPX packed file 14 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

Processes:

resource	yara_rule
behavioral2/memory/5092-0-0x0000000000400000-0x0000000000434000-memory.dmp	upx
\??\c:\windows\system\explorer.exe	upx
behavioral2/memory/3584-9-0x0000000000400000-0x0000000000434000-memory.dmp	upx
C:\Windows\System\spoolsv.exe	upx
behavioral2/memory/3956-19-0x0000000000400000-0x0000000000434000-memory.dmp	upx
C:\Windows\System\svchost.exe	upx
behavioral2/memory/3372-27-0x0000000000400000-0x0000000000434000-memory.dmp	upx
behavioral2/memory/4856-38-0x0000000000400000-0x0000000000434000-memory.dmp	upx
behavioral2/memory/3956-40-0x0000000000400000-0x0000000000434000-memory.dmp	upx
behavioral2/memory/5092-42-0x0000000000400000-0x0000000000434000-memory.dmp	upx
C:\Users\Admin\AppData\Roaming\mrsys.exe	upx
behavioral2/memory/3584-44-0x0000000000400000-0x0000000000434000-memory.dmp	upx
behavioral2/memory/3372-45-0x0000000000400000-0x0000000000434000-memory.dmp	upx
behavioral2/memory/3584-54-0x0000000000400000-0x0000000000434000-memory.dmp	upx

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

Modify Registry

Processes:

explorer.exesvchost.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Explorer = "c:\\windows\\system\\explorer.exe RO"	explorer.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Svchost = "c:\\windows\\system\\svchost.exe RO"	explorer.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Explorer = "c:\\windows\\system\\explorer.exe RO"	svchost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Svchost = "c:\\windows\\system\\svchost.exe RO"	svchost.exe

Drops file in Windows directory 6 IoCs

Processes:

explorer.exespoolsv.exesvchost.exebd88cf8c700d7064f3738f7349dab2224b9ff4eae69bd2459f35d19c4cf78063.exe

description	ioc	process
File opened for modification	\??\c:\windows\system\spoolsv.exe	explorer.exe
File opened for modification	\??\c:\windows\system\svchost.exe	spoolsv.exe
File opened for modification	\??\c:\windows\system\explorer.exe	explorer.exe
File opened for modification	\??\c:\windows\system\svchost.exe	svchost.exe
File opened for modification	C:\Windows\system\udsys.exe	explorer.exe
File opened for modification	\??\c:\windows\system\explorer.exe	bd88cf8c700d7064f3738f7349dab2224b9ff4eae69bd2459f35d19c4cf78063.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 64 IoCs

Processes:

bd88cf8c700d7064f3738f7349dab2224b9ff4eae69bd2459f35d19c4cf78063.exeexplorer.exesvchost.exe

pid	process
5092	bd88cf8c700d7064f3738f7349dab2224b9ff4eae69bd2459f35d19c4cf78063.exe
5092	bd88cf8c700d7064f3738f7349dab2224b9ff4eae69bd2459f35d19c4cf78063.exe
3584	explorer.exe
3584	explorer.exe
3584	explorer.exe
3584	explorer.exe
3584	explorer.exe
3584	explorer.exe
3372	svchost.exe
3372	svchost.exe
3372	svchost.exe
3372	svchost.exe
3584	explorer.exe
3584	explorer.exe
3372	svchost.exe
3372	svchost.exe
3584	explorer.exe
3584	explorer.exe
3372	svchost.exe
3372	svchost.exe
3584	explorer.exe
3584	explorer.exe
3372	svchost.exe
3372	svchost.exe
3584	explorer.exe
3584	explorer.exe
3372	svchost.exe
3372	svchost.exe
3584	explorer.exe
3584	explorer.exe
3372	svchost.exe
3372	svchost.exe
3584	explorer.exe
3584	explorer.exe
3372	svchost.exe
3372	svchost.exe
3584	explorer.exe
3584	explorer.exe
3372	svchost.exe
3372	svchost.exe
3584	explorer.exe
3584	explorer.exe
3372	svchost.exe
3372	svchost.exe
3584	explorer.exe
3584	explorer.exe
3372	svchost.exe
3372	svchost.exe
3584	explorer.exe
3584	explorer.exe
3372	svchost.exe
3372	svchost.exe
3584	explorer.exe
3584	explorer.exe
3372	svchost.exe
3372	svchost.exe
3584	explorer.exe
3584	explorer.exe
3372	svchost.exe
3372	svchost.exe
3584	explorer.exe
3584	explorer.exe
3372	svchost.exe
3372	svchost.exe

Suspicious behavior: GetForegroundWindowSpam 2 IoCs

Processes:

explorer.exesvchost.exe

pid process

3584 explorer.exe
3372 svchost.exe

pid	process
3584	explorer.exe
3372	svchost.exe

Suspicious use of SetWindowsHookEx 12 IoCs

Processes:

bd88cf8c700d7064f3738f7349dab2224b9ff4eae69bd2459f35d19c4cf78063.exeexplorer.exespoolsv.exesvchost.exespoolsv.exe

pid	process
5092	bd88cf8c700d7064f3738f7349dab2224b9ff4eae69bd2459f35d19c4cf78063.exe
5092	bd88cf8c700d7064f3738f7349dab2224b9ff4eae69bd2459f35d19c4cf78063.exe
3584	explorer.exe
3584	explorer.exe
3956	spoolsv.exe
3956	spoolsv.exe
3372	svchost.exe
3372	svchost.exe
4856	spoolsv.exe
4856	spoolsv.exe
3584	explorer.exe
3584	explorer.exe

Suspicious use of WriteProcessMemory 21 IoCs

Processes:

bd88cf8c700d7064f3738f7349dab2224b9ff4eae69bd2459f35d19c4cf78063.exeexplorer.exespoolsv.exesvchost.exe

description	pid	process	target process
PID 5092 wrote to memory of 3584	5092	bd88cf8c700d7064f3738f7349dab2224b9ff4eae69bd2459f35d19c4cf78063.exe	explorer.exe
PID 5092 wrote to memory of 3584	5092	bd88cf8c700d7064f3738f7349dab2224b9ff4eae69bd2459f35d19c4cf78063.exe	explorer.exe
PID 5092 wrote to memory of 3584	5092	bd88cf8c700d7064f3738f7349dab2224b9ff4eae69bd2459f35d19c4cf78063.exe	explorer.exe
PID 3584 wrote to memory of 3956	3584	explorer.exe	spoolsv.exe
PID 3584 wrote to memory of 3956	3584	explorer.exe	spoolsv.exe
PID 3584 wrote to memory of 3956	3584	explorer.exe	spoolsv.exe
PID 3956 wrote to memory of 3372	3956	spoolsv.exe	svchost.exe
PID 3956 wrote to memory of 3372	3956	spoolsv.exe	svchost.exe
PID 3956 wrote to memory of 3372	3956	spoolsv.exe	svchost.exe
PID 3372 wrote to memory of 4856	3372	svchost.exe	spoolsv.exe
PID 3372 wrote to memory of 4856	3372	svchost.exe	spoolsv.exe
PID 3372 wrote to memory of 4856	3372	svchost.exe	spoolsv.exe
PID 3372 wrote to memory of 4256	3372	svchost.exe	at.exe
PID 3372 wrote to memory of 4256	3372	svchost.exe	at.exe
PID 3372 wrote to memory of 4256	3372	svchost.exe	at.exe
PID 3372 wrote to memory of 2440	3372	svchost.exe	at.exe
PID 3372 wrote to memory of 2440	3372	svchost.exe	at.exe
PID 3372 wrote to memory of 2440	3372	svchost.exe	at.exe
PID 3372 wrote to memory of 2824	3372	svchost.exe	at.exe
PID 3372 wrote to memory of 2824	3372	svchost.exe	at.exe
PID 3372 wrote to memory of 2824	3372	svchost.exe	at.exe

C:\Users\Admin\AppData\Local\Temp\bd88cf8c700d7064f3738f7349dab2224b9ff4eae69bd2459f35d19c4cf78063.exe
"C:\Users\Admin\AppData\Local\Temp\bd88cf8c700d7064f3738f7349dab2224b9ff4eae69bd2459f35d19c4cf78063.exe"
1⤵
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:5092
- \??\c:\windows\system\explorer.exe
  c:\windows\system\explorer.exe
  2⤵
  - Modifies WinLogon for persistence
  - Modifies visiblity of hidden/system files in Explorer
  - Modifies Installed Components in the registry
  - Executes dropped EXE
  - Adds Run key to start application
  - Drops file in Windows directory
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: GetForegroundWindowSpam
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3584
- - \??\c:\windows\system\spoolsv.exe
    c:\windows\system\spoolsv.exe SE
    3⤵
    - Executes dropped EXE
    - Drops file in Windows directory
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:3956
  - - \??\c:\windows\system\svchost.exe
      c:\windows\system\svchost.exe
      4⤵
      Modifies WinLogon for persistence
      Modifies visiblity of hidden/system files in Explorer
      Modifies Installed Components in the registry
      Executes dropped EXE
      Adds Run key to start application
      Drops file in Windows directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious behavior: GetForegroundWindowSpam
      Suspicious use of SetWindowsHookEx
      Suspicious use of WriteProcessMemory
      PID:3372
    - - \??\c:\windows\system\spoolsv.exe
        
        c:\windows\system\spoolsv.exe PR
        5⤵
        Executes dropped EXE
        Suspicious use of SetWindowsHookEx
        
        PID:4856
    - - C:\Windows\SysWOW64\at.exe
        
        at 02:32 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
        5⤵
        
        PID:4256
    - - C:\Windows\SysWOW64\at.exe
        
        at 02:33 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
        5⤵
        
        PID:2440
    - - C:\Windows\SysWOW64\at.exe
        
        at 02:34 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
        5⤵
        
        PID:2824

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

3

T1547

Registry Run Keys / Startup Folder

2

Winlogon Helper DLL

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

3

T1547

Registry Run Keys / Startup Folder

2

Winlogon Helper DLL

T1547.004

Defense Evasion

Hide Artifacts

T1564

Hidden Files and Directories

Modify Registry

Credential Access

Discovery

System Information Discovery