c61214941383f26350a38acb13572d054087927943f4ad5befd15d5848f5981b

Modify Registry

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{39971C21-8B9A-11D5-EBA1-F78EEEEEE983}	virussign.com_6dba1b11bb66d156b1af3c0a5d645a00.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{39971C21-8B9A-11D5-EBA1-F78EEEEEE983}\StubPath = "msati32.exe"	virussign.com_6dba1b11bb66d156b1af3c0a5d645a00.exe

Modifies system executable filetype association 2 TTPs 1 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

UPX packed file 3 IoCs

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

upx

resource	yara_rule
behavioral2/memory/3104-0-0x0000000000400000-0x0000000000439000-memory.dmp	upx
behavioral2/files/0x00070000000234a3-5.dat	upx
behavioral2/memory/3104-7-0x0000000000400000-0x0000000000439000-memory.dmp	upx

Adds Run key to start application 2 TTPs 2 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-1-5-21-3571316656-3665257725-2415531812-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\VCL = "vcl32.exe"	virussign.com_6dba1b11bb66d156b1af3c0a5d645a00.exe

Drops file in System32 directory 6 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\msati32.exe	virussign.com_6dba1b11bb66d156b1af3c0a5d645a00.exe
File opened for modification	C:\Windows\SysWOW64\msati32.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
File created	C:\Windows\SysWOW64\vcl32.exe	virussign.com_6dba1b11bb66d156b1af3c0a5d645a00.exe
File opened for modification	C:\Windows\SysWOW64\vcl32.exe	virussign.com_6dba1b11bb66d156b1af3c0a5d645a00.exe

Program crash 1 IoCs

pid	pid_target	Process	procid_target
824	3104	WerFault.exe	81

Modifies registry class 5 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{39971C21-8B9A-11D5-EBA1-F78EEEEEE983}	virussign.com_6dba1b11bb66d156b1af3c0a5d645a00.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{39971C21-8B9A-11D5-EBA1-F78EEEEEE983}\InprocServer32	virussign.com_6dba1b11bb66d156b1af3c0a5d645a00.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{39971C21-8B9A-11D5-EBA1-F78EEEEEE983}\sm = ebb5525fa3bcf9422c8ff945977d6af9	virussign.com_6dba1b11bb66d156b1af3c0a5d645a00.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{39971C21-8B9A-11D5-EBA1-F78EEEEEE983}\ax = 7bd2239f64d3d8834fca393a7a1f0b84	virussign.com_6dba1b11bb66d156b1af3c0a5d645a00.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "C:\\Windows\\SysWow64\\concp32.exe \"%1\" %*"	virussign.com_6dba1b11bb66d156b1af3c0a5d645a00.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
3104	virussign.com_6dba1b11bb66d156b1af3c0a5d645a00.exe

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
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
PID:3104
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 3104 -s 752
  2⤵
  - Program crash
  PID:824

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 208 -p 3104 -ip 3104
1⤵
PID:1472

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