b93739acaed9d2f6a48c9ab2239165c8e4741ec4b6de6643ba1efca12bec7d64

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-1-5-21-2737914667-933161113-3798636211-1000\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	explorer.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2737914667-933161113-3798636211-1000\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	svchost.exe

UPX dump on OEP (original entry point) 14 IoCs

Processes:

resource	yara_rule
behavioral1/memory/1640-0-0x0000000000400000-0x0000000000434000-memory.dmp	UPX
\Windows\system\explorer.exe	UPX
behavioral1/memory/2060-15-0x0000000000400000-0x0000000000434000-memory.dmp	UPX
\Windows\system\spoolsv.exe	UPX
behavioral1/memory/2060-29-0x0000000002720000-0x0000000002754000-memory.dmp	UPX
\Windows\system\svchost.exe	UPX
behavioral1/memory/2868-53-0x0000000000400000-0x0000000000434000-memory.dmp	UPX
behavioral1/memory/2868-57-0x0000000000400000-0x0000000000434000-memory.dmp	UPX
behavioral1/memory/2716-61-0x0000000000400000-0x0000000000434000-memory.dmp	UPX
behavioral1/memory/1640-63-0x0000000000400000-0x0000000000434000-memory.dmp	UPX
C:\Users\Admin\AppData\Roaming\mrsys.exe	UPX
behavioral1/memory/2772-66-0x0000000000400000-0x0000000000434000-memory.dmp	UPX
behavioral1/memory/2060-65-0x0000000000400000-0x0000000000434000-memory.dmp	UPX
behavioral1/memory/2060-75-0x0000000000400000-0x0000000000434000-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 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
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

Executes dropped EXE 4 IoCs

Processes:

explorer.exespoolsv.exesvchost.exespoolsv.exe

pid process

2060 explorer.exe
2716 spoolsv.exe
2772 svchost.exe
2868 spoolsv.exe

pid	process
2060	explorer.exe
2716	spoolsv.exe
2772	svchost.exe
2868	spoolsv.exe

Loads dropped DLL 8 IoCs

Processes:

b93739acaed9d2f6a48c9ab2239165c8e4741ec4b6de6643ba1efca12bec7d64.exeexplorer.exespoolsv.exesvchost.exe

pid	process
1640	b93739acaed9d2f6a48c9ab2239165c8e4741ec4b6de6643ba1efca12bec7d64.exe
1640	b93739acaed9d2f6a48c9ab2239165c8e4741ec4b6de6643ba1efca12bec7d64.exe
2060	explorer.exe
2060	explorer.exe
2716	spoolsv.exe
2716	spoolsv.exe
2772	svchost.exe
2772	svchost.exe

UPX packed file 14 IoCs

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

upx

Processes:

resource	yara_rule
behavioral1/memory/1640-0-0x0000000000400000-0x0000000000434000-memory.dmp	upx
\Windows\system\explorer.exe	upx
behavioral1/memory/2060-15-0x0000000000400000-0x0000000000434000-memory.dmp	upx
\Windows\system\spoolsv.exe	upx
behavioral1/memory/2060-29-0x0000000002720000-0x0000000002754000-memory.dmp	upx
\Windows\system\svchost.exe	upx
behavioral1/memory/2868-53-0x0000000000400000-0x0000000000434000-memory.dmp	upx
behavioral1/memory/2868-57-0x0000000000400000-0x0000000000434000-memory.dmp	upx
behavioral1/memory/2716-61-0x0000000000400000-0x0000000000434000-memory.dmp	upx
behavioral1/memory/1640-63-0x0000000000400000-0x0000000000434000-memory.dmp	upx
C:\Users\Admin\AppData\Roaming\mrsys.exe	upx
behavioral1/memory/2772-66-0x0000000000400000-0x0000000000434000-memory.dmp	upx
behavioral1/memory/2060-65-0x0000000000400000-0x0000000000434000-memory.dmp	upx
behavioral1/memory/2060-75-0x0000000000400000-0x0000000000434000-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:

b93739acaed9d2f6a48c9ab2239165c8e4741ec4b6de6643ba1efca12bec7d64.exeexplorer.exespoolsv.exesvchost.exe

description	ioc	process
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
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

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
1640	b93739acaed9d2f6a48c9ab2239165c8e4741ec4b6de6643ba1efca12bec7d64.exe
2060	explorer.exe
2060	explorer.exe
2060	explorer.exe
2060	explorer.exe
2772	svchost.exe
2772	svchost.exe
2772	svchost.exe
2060	explorer.exe
2060	explorer.exe
2772	svchost.exe
2060	explorer.exe
2772	svchost.exe
2772	svchost.exe
2060	explorer.exe
2060	explorer.exe
2772	svchost.exe
2772	svchost.exe
2060	explorer.exe
2772	svchost.exe
2060	explorer.exe
2060	explorer.exe
2772	svchost.exe
2772	svchost.exe
2060	explorer.exe
2060	explorer.exe
2772	svchost.exe
2772	svchost.exe
2060	explorer.exe
2060	explorer.exe
2772	svchost.exe
2060	explorer.exe
2772	svchost.exe
2060	explorer.exe
2772	svchost.exe
2060	explorer.exe
2772	svchost.exe
2060	explorer.exe
2772	svchost.exe
2772	svchost.exe
2060	explorer.exe
2060	explorer.exe
2772	svchost.exe
2060	explorer.exe
2772	svchost.exe
2772	svchost.exe
2060	explorer.exe
2060	explorer.exe
2772	svchost.exe
2060	explorer.exe
2772	svchost.exe
2060	explorer.exe
2772	svchost.exe
2772	svchost.exe
2060	explorer.exe
2060	explorer.exe
2772	svchost.exe
2060	explorer.exe
2772	svchost.exe
2060	explorer.exe
2772	svchost.exe
2772	svchost.exe
2060	explorer.exe
2060	explorer.exe

Suspicious behavior: GetForegroundWindowSpam 2 IoCs

Processes:

explorer.exesvchost.exe

pid process

2060 explorer.exe
2772 svchost.exe

pid	process
2060	explorer.exe
2772	svchost.exe

Suspicious use of SetWindowsHookEx 12 IoCs

Processes:

b93739acaed9d2f6a48c9ab2239165c8e4741ec4b6de6643ba1efca12bec7d64.exeexplorer.exespoolsv.exesvchost.exespoolsv.exe

pid	process
1640	b93739acaed9d2f6a48c9ab2239165c8e4741ec4b6de6643ba1efca12bec7d64.exe
1640	b93739acaed9d2f6a48c9ab2239165c8e4741ec4b6de6643ba1efca12bec7d64.exe
2060	explorer.exe
2060	explorer.exe
2716	spoolsv.exe
2716	spoolsv.exe
2772	svchost.exe
2772	svchost.exe
2868	spoolsv.exe
2868	spoolsv.exe
2060	explorer.exe
2060	explorer.exe

Suspicious use of WriteProcessMemory 28 IoCs

Processes:

b93739acaed9d2f6a48c9ab2239165c8e4741ec4b6de6643ba1efca12bec7d64.exeexplorer.exespoolsv.exesvchost.exe

description	pid	process	target process
PID 1640 wrote to memory of 2060	1640	b93739acaed9d2f6a48c9ab2239165c8e4741ec4b6de6643ba1efca12bec7d64.exe	explorer.exe
PID 1640 wrote to memory of 2060	1640	b93739acaed9d2f6a48c9ab2239165c8e4741ec4b6de6643ba1efca12bec7d64.exe	explorer.exe
PID 1640 wrote to memory of 2060	1640	b93739acaed9d2f6a48c9ab2239165c8e4741ec4b6de6643ba1efca12bec7d64.exe	explorer.exe
PID 1640 wrote to memory of 2060	1640	b93739acaed9d2f6a48c9ab2239165c8e4741ec4b6de6643ba1efca12bec7d64.exe	explorer.exe
PID 2060 wrote to memory of 2716	2060	explorer.exe	spoolsv.exe
PID 2060 wrote to memory of 2716	2060	explorer.exe	spoolsv.exe
PID 2060 wrote to memory of 2716	2060	explorer.exe	spoolsv.exe
PID 2060 wrote to memory of 2716	2060	explorer.exe	spoolsv.exe
PID 2716 wrote to memory of 2772	2716	spoolsv.exe	svchost.exe
PID 2716 wrote to memory of 2772	2716	spoolsv.exe	svchost.exe
PID 2716 wrote to memory of 2772	2716	spoolsv.exe	svchost.exe
PID 2716 wrote to memory of 2772	2716	spoolsv.exe	svchost.exe
PID 2772 wrote to memory of 2868	2772	svchost.exe	spoolsv.exe
PID 2772 wrote to memory of 2868	2772	svchost.exe	spoolsv.exe
PID 2772 wrote to memory of 2868	2772	svchost.exe	spoolsv.exe
PID 2772 wrote to memory of 2868	2772	svchost.exe	spoolsv.exe
PID 2772 wrote to memory of 2564	2772	svchost.exe	at.exe
PID 2772 wrote to memory of 2564	2772	svchost.exe	at.exe
PID 2772 wrote to memory of 2564	2772	svchost.exe	at.exe
PID 2772 wrote to memory of 2564	2772	svchost.exe	at.exe
PID 2772 wrote to memory of 1540	2772	svchost.exe	at.exe
PID 2772 wrote to memory of 1540	2772	svchost.exe	at.exe
PID 2772 wrote to memory of 1540	2772	svchost.exe	at.exe
PID 2772 wrote to memory of 1540	2772	svchost.exe	at.exe
PID 2772 wrote to memory of 1468	2772	svchost.exe	at.exe
PID 2772 wrote to memory of 1468	2772	svchost.exe	at.exe
PID 2772 wrote to memory of 1468	2772	svchost.exe	at.exe
PID 2772 wrote to memory of 1468	2772	svchost.exe	at.exe

C:\Users\Admin\AppData\Local\Temp\b93739acaed9d2f6a48c9ab2239165c8e4741ec4b6de6643ba1efca12bec7d64.exe
"C:\Users\Admin\AppData\Local\Temp\b93739acaed9d2f6a48c9ab2239165c8e4741ec4b6de6643ba1efca12bec7d64.exe"
1⤵
- Loads dropped DLL
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1640

\??\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
- Loads dropped DLL
- 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:2060

\??\c:\windows\system\spoolsv.exe
c:\windows\system\spoolsv.exe SE
3⤵
- Executes dropped EXE
- Loads dropped DLL
- Drops file in Windows directory
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2716

\??\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
- Loads dropped DLL
- 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:2772

\??\c:\windows\system\spoolsv.exe
c:\windows\system\spoolsv.exe PR
5⤵
- Executes dropped EXE
- Suspicious use of SetWindowsHookEx
PID:2868

C:\Windows\SysWOW64\at.exe
at 02:28 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
5⤵
PID:2564

C:\Windows\SysWOW64\at.exe
at 02:29 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
5⤵
PID:1540

C:\Windows\SysWOW64\at.exe
at 02:30 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
5⤵
PID:1468

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