db5822d2faef5fd72bbc4198569d9ede539a33ea695bea6841824b029866a3c4

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-1-5-21-3808065738-1666277613-1125846146-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	explorer.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-3808065738-1666277613-1125846146-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	svchost.exe

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 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
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

Executes dropped EXE 4 IoCs

Processes:

explorer.exespoolsv.exesvchost.exespoolsv.exe

pid process

1396 explorer.exe
2152 spoolsv.exe
2964 svchost.exe
1388 spoolsv.exe

pid	process
1396	explorer.exe
2152	spoolsv.exe
2964	svchost.exe
1388	spoolsv.exe

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 7 IoCs

Processes:

explorer.exedb5822d2faef5fd72bbc4198569d9ede539a33ea695bea6841824b029866a3c4.exespoolsv.exesvchost.exe

description	ioc	process
File opened for modification	C:\Windows\System\tjcm.cmn	explorer.exe
File opened for modification	\??\c:\windows\system\explorer.exe	db5822d2faef5fd72bbc4198569d9ede539a33ea695bea6841824b029866a3c4.exe
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\tjud.exe	explorer.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:

db5822d2faef5fd72bbc4198569d9ede539a33ea695bea6841824b029866a3c4.exeexplorer.exesvchost.exe

pid	process
2136	db5822d2faef5fd72bbc4198569d9ede539a33ea695bea6841824b029866a3c4.exe
2136	db5822d2faef5fd72bbc4198569d9ede539a33ea695bea6841824b029866a3c4.exe
1396	explorer.exe
1396	explorer.exe
1396	explorer.exe
1396	explorer.exe
1396	explorer.exe
1396	explorer.exe
1396	explorer.exe
2964	svchost.exe
1396	explorer.exe
2964	svchost.exe
2964	svchost.exe
2964	svchost.exe
1396	explorer.exe
1396	explorer.exe
2964	svchost.exe
2964	svchost.exe
1396	explorer.exe
1396	explorer.exe
2964	svchost.exe
2964	svchost.exe
1396	explorer.exe
1396	explorer.exe
2964	svchost.exe
2964	svchost.exe
1396	explorer.exe
1396	explorer.exe
2964	svchost.exe
2964	svchost.exe
1396	explorer.exe
1396	explorer.exe
2964	svchost.exe
2964	svchost.exe
1396	explorer.exe
1396	explorer.exe
2964	svchost.exe
2964	svchost.exe
1396	explorer.exe
1396	explorer.exe
2964	svchost.exe
2964	svchost.exe
1396	explorer.exe
1396	explorer.exe
2964	svchost.exe
2964	svchost.exe
1396	explorer.exe
1396	explorer.exe
2964	svchost.exe
2964	svchost.exe
1396	explorer.exe
1396	explorer.exe
2964	svchost.exe
2964	svchost.exe
1396	explorer.exe
1396	explorer.exe
2964	svchost.exe
2964	svchost.exe
1396	explorer.exe
1396	explorer.exe
2964	svchost.exe
2964	svchost.exe
1396	explorer.exe
1396	explorer.exe

Suspicious behavior: GetForegroundWindowSpam 2 IoCs

Processes:

explorer.exesvchost.exe

pid process

1396 explorer.exe
2964 svchost.exe

pid	process
1396	explorer.exe
2964	svchost.exe

Suspicious use of SetWindowsHookEx 10 IoCs

Processes:

db5822d2faef5fd72bbc4198569d9ede539a33ea695bea6841824b029866a3c4.exeexplorer.exespoolsv.exesvchost.exespoolsv.exe

pid	process
2136	db5822d2faef5fd72bbc4198569d9ede539a33ea695bea6841824b029866a3c4.exe
2136	db5822d2faef5fd72bbc4198569d9ede539a33ea695bea6841824b029866a3c4.exe
1396	explorer.exe
1396	explorer.exe
2152	spoolsv.exe
2152	spoolsv.exe
2964	svchost.exe
2964	svchost.exe
1388	spoolsv.exe
1388	spoolsv.exe

Suspicious use of WriteProcessMemory 12 IoCs

Processes:

db5822d2faef5fd72bbc4198569d9ede539a33ea695bea6841824b029866a3c4.exeexplorer.exespoolsv.exesvchost.exe

description	pid	process	target process
PID 2136 wrote to memory of 1396	2136	db5822d2faef5fd72bbc4198569d9ede539a33ea695bea6841824b029866a3c4.exe	explorer.exe
PID 2136 wrote to memory of 1396	2136	db5822d2faef5fd72bbc4198569d9ede539a33ea695bea6841824b029866a3c4.exe	explorer.exe
PID 2136 wrote to memory of 1396	2136	db5822d2faef5fd72bbc4198569d9ede539a33ea695bea6841824b029866a3c4.exe	explorer.exe
PID 1396 wrote to memory of 2152	1396	explorer.exe	spoolsv.exe
PID 1396 wrote to memory of 2152	1396	explorer.exe	spoolsv.exe
PID 1396 wrote to memory of 2152	1396	explorer.exe	spoolsv.exe
PID 2152 wrote to memory of 2964	2152	spoolsv.exe	svchost.exe
PID 2152 wrote to memory of 2964	2152	spoolsv.exe	svchost.exe
PID 2152 wrote to memory of 2964	2152	spoolsv.exe	svchost.exe
PID 2964 wrote to memory of 1388	2964	svchost.exe	spoolsv.exe
PID 2964 wrote to memory of 1388	2964	svchost.exe	spoolsv.exe
PID 2964 wrote to memory of 1388	2964	svchost.exe	spoolsv.exe

C:\Users\Admin\AppData\Local\Temp\db5822d2faef5fd72bbc4198569d9ede539a33ea695bea6841824b029866a3c4.exe
"C:\Users\Admin\AppData\Local\Temp\db5822d2faef5fd72bbc4198569d9ede539a33ea695bea6841824b029866a3c4.exe"
1⤵
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2136

\??\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:1396

\??\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:2152

\??\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:2964

\??\c:\windows\system\spoolsv.exe
c:\windows\system\spoolsv.exe PR
5⤵
- Executes dropped EXE
- Suspicious use of SetWindowsHookEx
PID:1388

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=1344 --field-trial-handle=2292,i,2103142837140538807,15881446839139365070,262144 --variations-seed-version /prefetch:8
1⤵
PID:4812

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