b93739acaed9d2f6a48c9ab2239165c8e4741ec4b6de6643ba1efca12bec7d64

Processes:

svchost.exeexplorer.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"	svchost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\shell = "C:\\Windows\\explorer.exe, c:\\windows\\system\\explorer.exe"	explorer.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-1-5-21-1337824034-2731376981-3755436523-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	explorer.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-1337824034-2731376981-3755436523-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	svchost.exe

UPX dump on OEP (original entry point) 12 IoCs

Processes:

resource	yara_rule
behavioral2/memory/3580-0-0x0000000000400000-0x0000000000434000-memory.dmp	UPX
C:\Windows\System\explorer.exe	UPX
C:\Windows\System\spoolsv.exe	UPX
behavioral2/memory/372-17-0x0000000000400000-0x0000000000434000-memory.dmp	UPX
C:\Windows\System\svchost.exe	UPX
behavioral2/memory/4912-36-0x0000000000400000-0x0000000000434000-memory.dmp	UPX
behavioral2/memory/372-39-0x0000000000400000-0x0000000000434000-memory.dmp	UPX
behavioral2/memory/3580-40-0x0000000000400000-0x0000000000434000-memory.dmp	UPX
C:\Users\Admin\AppData\Roaming\mrsys.exe	UPX
behavioral2/memory/1300-42-0x0000000000400000-0x0000000000434000-memory.dmp	UPX
behavioral2/memory/3340-43-0x0000000000400000-0x0000000000434000-memory.dmp	UPX
behavioral2/memory/1300-52-0x0000000000400000-0x0000000000434000-memory.dmp	UPX

Modifies Installed Components in the registry 2 TTPs 8 IoCs

persistence

Registry Run Keys / Startup Folder

Modify Registry

Processes:

explorer.exesvchost.exe

description	ioc	process
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
Key deleted	\REGISTRY\MACHINE\SOFTWARE\WOW6432NODE\MICROSOFT\ACTIVE SETUP\INSTALLED COMPONENTS\{F146C9B1-VMVQ-A9RC-NUFL-D0BA00B4E999}	svchost.exe

Executes dropped EXE 4 IoCs

Processes:

explorer.exespoolsv.exesvchost.exespoolsv.exe

pid process

1300 explorer.exe
372 spoolsv.exe
3340 svchost.exe
4912 spoolsv.exe

pid	process
1300	explorer.exe
372	spoolsv.exe
3340	svchost.exe
4912	spoolsv.exe

UPX packed file 12 IoCs

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

upx

Processes:

resource	yara_rule
behavioral2/memory/3580-0-0x0000000000400000-0x0000000000434000-memory.dmp	upx
C:\Windows\System\explorer.exe	upx
C:\Windows\System\spoolsv.exe	upx
behavioral2/memory/372-17-0x0000000000400000-0x0000000000434000-memory.dmp	upx
C:\Windows\System\svchost.exe	upx
behavioral2/memory/4912-36-0x0000000000400000-0x0000000000434000-memory.dmp	upx
behavioral2/memory/372-39-0x0000000000400000-0x0000000000434000-memory.dmp	upx
behavioral2/memory/3580-40-0x0000000000400000-0x0000000000434000-memory.dmp	upx
C:\Users\Admin\AppData\Roaming\mrsys.exe	upx
behavioral2/memory/1300-42-0x0000000000400000-0x0000000000434000-memory.dmp	upx
behavioral2/memory/3340-43-0x0000000000400000-0x0000000000434000-memory.dmp	upx
behavioral2/memory/1300-52-0x0000000000400000-0x0000000000434000-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.exesvchost.exeb93739acaed9d2f6a48c9ab2239165c8e4741ec4b6de6643ba1efca12bec7d64.exespoolsv.exe

description	ioc	process
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	b93739acaed9d2f6a48c9ab2239165c8e4741ec4b6de6643ba1efca12bec7d64.exe
File opened for modification	\??\c:\windows\system\spoolsv.exe	explorer.exe
File opened for modification	\??\c:\windows\system\svchost.exe	spoolsv.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:

b93739acaed9d2f6a48c9ab2239165c8e4741ec4b6de6643ba1efca12bec7d64.exeexplorer.exesvchost.exe

pid	process
3580	b93739acaed9d2f6a48c9ab2239165c8e4741ec4b6de6643ba1efca12bec7d64.exe
3580	b93739acaed9d2f6a48c9ab2239165c8e4741ec4b6de6643ba1efca12bec7d64.exe
1300	explorer.exe
1300	explorer.exe
1300	explorer.exe
1300	explorer.exe
1300	explorer.exe
1300	explorer.exe
3340	svchost.exe
3340	svchost.exe
3340	svchost.exe
3340	svchost.exe
1300	explorer.exe
1300	explorer.exe
3340	svchost.exe
3340	svchost.exe
1300	explorer.exe
1300	explorer.exe
3340	svchost.exe
3340	svchost.exe
1300	explorer.exe
1300	explorer.exe
3340	svchost.exe
3340	svchost.exe
1300	explorer.exe
1300	explorer.exe
3340	svchost.exe
3340	svchost.exe
1300	explorer.exe
1300	explorer.exe
3340	svchost.exe
3340	svchost.exe
1300	explorer.exe
1300	explorer.exe
3340	svchost.exe
3340	svchost.exe
1300	explorer.exe
1300	explorer.exe
3340	svchost.exe
3340	svchost.exe
1300	explorer.exe
1300	explorer.exe
3340	svchost.exe
3340	svchost.exe
1300	explorer.exe
1300	explorer.exe
3340	svchost.exe
3340	svchost.exe
1300	explorer.exe
1300	explorer.exe
3340	svchost.exe
3340	svchost.exe
1300	explorer.exe
1300	explorer.exe
3340	svchost.exe
3340	svchost.exe
1300	explorer.exe
1300	explorer.exe
3340	svchost.exe
3340	svchost.exe
1300	explorer.exe
1300	explorer.exe
3340	svchost.exe
3340	svchost.exe

Suspicious behavior: GetForegroundWindowSpam 2 IoCs

Processes:

explorer.exesvchost.exe

pid process

1300 explorer.exe
3340 svchost.exe

pid	process
1300	explorer.exe
3340	svchost.exe

Suspicious use of SetWindowsHookEx 12 IoCs

Processes:

b93739acaed9d2f6a48c9ab2239165c8e4741ec4b6de6643ba1efca12bec7d64.exeexplorer.exespoolsv.exesvchost.exespoolsv.exe

pid	process
3580	b93739acaed9d2f6a48c9ab2239165c8e4741ec4b6de6643ba1efca12bec7d64.exe
3580	b93739acaed9d2f6a48c9ab2239165c8e4741ec4b6de6643ba1efca12bec7d64.exe
1300	explorer.exe
1300	explorer.exe
372	spoolsv.exe
372	spoolsv.exe
3340	svchost.exe
3340	svchost.exe
4912	spoolsv.exe
4912	spoolsv.exe
1300	explorer.exe
1300	explorer.exe

Suspicious use of WriteProcessMemory 21 IoCs

Processes:

b93739acaed9d2f6a48c9ab2239165c8e4741ec4b6de6643ba1efca12bec7d64.exeexplorer.exespoolsv.exesvchost.exe

description	pid	process	target process
PID 3580 wrote to memory of 1300	3580	b93739acaed9d2f6a48c9ab2239165c8e4741ec4b6de6643ba1efca12bec7d64.exe	explorer.exe
PID 3580 wrote to memory of 1300	3580	b93739acaed9d2f6a48c9ab2239165c8e4741ec4b6de6643ba1efca12bec7d64.exe	explorer.exe
PID 3580 wrote to memory of 1300	3580	b93739acaed9d2f6a48c9ab2239165c8e4741ec4b6de6643ba1efca12bec7d64.exe	explorer.exe
PID 1300 wrote to memory of 372	1300	explorer.exe	spoolsv.exe
PID 1300 wrote to memory of 372	1300	explorer.exe	spoolsv.exe
PID 1300 wrote to memory of 372	1300	explorer.exe	spoolsv.exe
PID 372 wrote to memory of 3340	372	spoolsv.exe	svchost.exe
PID 372 wrote to memory of 3340	372	spoolsv.exe	svchost.exe
PID 372 wrote to memory of 3340	372	spoolsv.exe	svchost.exe
PID 3340 wrote to memory of 4912	3340	svchost.exe	spoolsv.exe
PID 3340 wrote to memory of 4912	3340	svchost.exe	spoolsv.exe
PID 3340 wrote to memory of 4912	3340	svchost.exe	spoolsv.exe
PID 3340 wrote to memory of 2884	3340	svchost.exe	at.exe
PID 3340 wrote to memory of 2884	3340	svchost.exe	at.exe
PID 3340 wrote to memory of 2884	3340	svchost.exe	at.exe
PID 3340 wrote to memory of 1172	3340	svchost.exe	at.exe
PID 3340 wrote to memory of 1172	3340	svchost.exe	at.exe
PID 3340 wrote to memory of 1172	3340	svchost.exe	at.exe
PID 3340 wrote to memory of 1712	3340	svchost.exe	at.exe
PID 3340 wrote to memory of 1712	3340	svchost.exe	at.exe
PID 3340 wrote to memory of 1712	3340	svchost.exe	at.exe

C:\Users\Admin\AppData\Local\Temp\b93739acaed9d2f6a48c9ab2239165c8e4741ec4b6de6643ba1efca12bec7d64.exe
"C:\Users\Admin\AppData\Local\Temp\b93739acaed9d2f6a48c9ab2239165c8e4741ec4b6de6643ba1efca12bec7d64.exe"
1⤵
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3580

\??\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:1300

\??\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:372

\??\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:3340

\??\c:\windows\system\spoolsv.exe
c:\windows\system\spoolsv.exe PR
5⤵
- Executes dropped EXE
- Suspicious use of SetWindowsHookEx
PID:4912

C:\Windows\SysWOW64\at.exe
at 02:28 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
5⤵
PID:2884

C:\Windows\SysWOW64\at.exe
at 02:29 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
5⤵
PID:1172

C:\Windows\SysWOW64\at.exe
at 02:30 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
5⤵
PID:1712

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