c61214941383f26350a38acb13572d054087927943f4ad5befd15d5848f5981b

Modify Registry

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{92AE3ED6-8B9A-11D5-EBA1-F78EEEEEE983}	virussign.com_6dba1b11bb66d156b1af3c0a5d645a00.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{92AE3ED6-8B9A-11D5-EBA1-F78EEEEEE983}\StubPath = "msrug32.exe"	virussign.com_6dba1b11bb66d156b1af3c0a5d645a00.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{92AE3ED6-8B9A-11D5-EBA1-F78EEEEEE983}	spoolsv.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{92AE3ED6-8B9A-11D5-EBA1-F78EEEEEE983}\StubPath = "msrug32.exe"	spoolsv.exe

Executes dropped EXE 1 IoCs

pid	Process
2348	spoolsv.exe

Modifies system executable filetype association 2 TTPs 2 IoCs

persistence

Modify Registry

Change Default File Association

T1546.001

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "C:\\Windows\\SysWow64\\concp32.exe \"%1\" %*"	virussign.com_6dba1b11bb66d156b1af3c0a5d645a00.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "C:\\Windows\\SysWow64\\concp32.exe \"%1\" %*"	spoolsv.exe

UPX packed file 6 IoCs

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

upx

resource	yara_rule
behavioral1/memory/2388-0-0x0000000000400000-0x0000000000439000-memory.dmp	upx
behavioral1/files/0x00070000000149ea-5.dat	upx
behavioral1/memory/2388-10-0x0000000000220000-0x0000000000259000-memory.dmp	upx
behavioral1/files/0x0031000000014701-15.dat	upx
behavioral1/memory/2388-14-0x0000000000400000-0x0000000000439000-memory.dmp	upx
behavioral1/memory/2348-16-0x0000000000400000-0x0000000000439000-memory.dmp	upx

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\VCL = "vcl32.exe"	virussign.com_6dba1b11bb66d156b1af3c0a5d645a00.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2297530677-1229052932-2803917579-1000\Software\Microsoft\Windows\CurrentVersion\Run\VCL = "vcl32.exe"	virussign.com_6dba1b11bb66d156b1af3c0a5d645a00.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\VCL = "vcl32.exe"	spoolsv.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2297530677-1229052932-2803917579-1000\Software\Microsoft\Windows\CurrentVersion\Run\VCL = "vcl32.exe"	spoolsv.exe

Drops file in System32 directory 6 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\vcl32.exe	virussign.com_6dba1b11bb66d156b1af3c0a5d645a00.exe
File opened for modification	C:\Windows\SysWOW64\vcl32.exe	virussign.com_6dba1b11bb66d156b1af3c0a5d645a00.exe
File created	C:\Windows\SysWOW64\msrug32.exe	virussign.com_6dba1b11bb66d156b1af3c0a5d645a00.exe
File opened for modification	C:\Windows\SysWOW64\msrug32.exe	virussign.com_6dba1b11bb66d156b1af3c0a5d645a00.exe
File created	C:\Windows\SysWOW64\concp32.exe	virussign.com_6dba1b11bb66d156b1af3c0a5d645a00.exe
File opened for modification	C:\Windows\SysWOW64\concp32.exe	virussign.com_6dba1b11bb66d156b1af3c0a5d645a00.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\spoolsv.exe	virussign.com_6dba1b11bb66d156b1af3c0a5d645a00.exe
File opened for modification	C:\Windows\spoolsv.exe	virussign.com_6dba1b11bb66d156b1af3c0a5d645a00.exe

Modifies registry class 12 IoCs

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "C:\\Windows\\SysWow64\\concp32.exe \"%1\" %*"	virussign.com_6dba1b11bb66d156b1af3c0a5d645a00.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{92AE3ED6-8B9A-11D5-EBA1-F78EEEEEE983}	spoolsv.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{92AE3ED6-8B9A-11D5-EBA1-F78EEEEEE983}\u0 = 658663d26f8bad325217a06063847056939f558d910ed252e05dd0113550f7fc0f4da82ff73a0681ba604c2d4f23269f	spoolsv.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{92AE3ED6-8B9A-11D5-EBA1-F78EEEEEE983}\u2 = a54a6b702f92fdf2acd57599e2ae1608015dff41aa020117fc9bd8e2dcf4340f3fa61eb55d6f28597df90602703809d4	spoolsv.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "C:\\Windows\\SysWow64\\concp32.exe \"%1\" %*"	spoolsv.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{92AE3ED6-8B9A-11D5-EBA1-F78EEEEEE983}\sm = 01b8ec350471bd332433eee476ebe1f3	virussign.com_6dba1b11bb66d156b1af3c0a5d645a00.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{92AE3ED6-8B9A-11D5-EBA1-F78EEEEEE983}\InprocServer32	virussign.com_6dba1b11bb66d156b1af3c0a5d645a00.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{92AE3ED6-8B9A-11D5-EBA1-F78EEEEEE983}\ax = d6a57cca6e7011eeb4a0bb4562a043b2	virussign.com_6dba1b11bb66d156b1af3c0a5d645a00.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{92AE3ED6-8B9A-11D5-EBA1-F78EEEEEE983}\InprocServer32	spoolsv.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{92AE3ED6-8B9A-11D5-EBA1-F78EEEEEE983}\u1 = 551d2e0658054ba756fd3798fea5ffca42865cb762a31639dabd7f2cca44e226	spoolsv.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{92AE3ED6-8B9A-11D5-EBA1-F78EEEEEE983}\v = "165"	spoolsv.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{92AE3ED6-8B9A-11D5-EBA1-F78EEEEEE983}	virussign.com_6dba1b11bb66d156b1af3c0a5d645a00.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2388	virussign.com_6dba1b11bb66d156b1af3c0a5d645a00.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2388 wrote to memory of 2348	2388	virussign.com_6dba1b11bb66d156b1af3c0a5d645a00.exe	28
PID 2388 wrote to memory of 2348	2388	virussign.com_6dba1b11bb66d156b1af3c0a5d645a00.exe	28
PID 2388 wrote to memory of 2348	2388	virussign.com_6dba1b11bb66d156b1af3c0a5d645a00.exe	28
PID 2388 wrote to memory of 2348	2388	virussign.com_6dba1b11bb66d156b1af3c0a5d645a00.exe	28

C:\Users\Admin\AppData\Local\Temp\virussign.com_6dba1b11bb66d156b1af3c0a5d645a00.exe
"C:\Users\Admin\AppData\Local\Temp\virussign.com_6dba1b11bb66d156b1af3c0a5d645a00.exe"
1⤵
- Modifies Installed Components in the registry
- Modifies system executable filetype association
- Adds Run key to start application
- Drops file in System32 directory
- Drops file in Windows directory
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:2388
- C:\Windows\spoolsv.exe
  C:\Windows\spoolsv.exe
  2⤵
  - Modifies Installed Components in the registry
  - Executes dropped EXE
  - Modifies system executable filetype association
  - Adds Run key to start application
  - Modifies registry class
  PID:2348

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

Event Triggered Execution

T1546

Change Default File Association

T1546.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

Event Triggered Execution

T1546

Change Default File Association

T1546.001

Defense Evasion

Modify Registry

3