Analysis Overview
SHA256
cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb
Threat Level: Shows suspicious behavior
The file cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb was found to be: Shows suspicious behavior.
Malicious Activity Summary
Executes dropped EXE
Loads dropped DLL
Modifies system executable filetype association
Drops file in System32 directory
Drops file in Windows directory
Unsigned PE
Modifies registry class
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: GetForegroundWindowSpam
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-06-03 22:29
Signatures
Unsigned PE
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Analysis: behavioral1
Detonation Overview
Submitted
2024-06-03 22:29
Reported
2024-06-03 22:32
Platform
win7-20240221-en
Max time kernel
149s
Max time network
127s
Command Line
Signatures
Executes dropped EXE
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system\rundll32.exe | N/A |
Loads dropped DLL
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe | N/A |
Modifies system executable filetype association
| Description | Indicator | Process | Target |
| Key created | \REGISTRY\MACHINE\Software\Classes\exefile\shell\open\command | C:\Windows\system\rundll32.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "¢« \"%1\" %*" | C:\Windows\system\rundll32.exe | N/A |
| Key created | \REGISTRY\MACHINE\Software\Classes\exefile\shell\open\command | C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "\"%1\" %*" | C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "¢« \"%1\" %*" | C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe | N/A |
Drops file in System32 directory
| Description | Indicator | Process | Target |
| File opened for modification | C:\Windows\SysWOW64\¢«.exe | C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe | N/A |
| File created | C:\Windows\SysWOW64\¢«.exe | C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe | N/A |
| File opened for modification | C:\Windows\SysWOW64\notepad¢¬.exe | C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe | N/A |
| File created | C:\Windows\SysWOW64\notepad¢¬.exe | C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe | N/A |
Drops file in Windows directory
| Description | Indicator | Process | Target |
| File opened for modification | C:\Windows\system\rundll32.exe | C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe | N/A |
| File created | C:\Windows\system\rundll32.exe | C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe | N/A |
Modifies registry class
| Description | Indicator | Process | Target |
| Key created | \REGISTRY\MACHINE\Software\Classes\exefile\shell\open\command | C:\Windows\system\rundll32.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "¢« \"%1\" %*" | C:\Windows\system\rundll32.exe | N/A |
| Key created | \REGISTRY\MACHINE\Software\Classes\txtfile\shell\open\command | C:\Windows\system\rundll32.exe | N/A |
| Set value (int) | \REGISTRY\MACHINE\SOFTWARE\Classes\MSipv\MainVer = "506" | C:\Windows\system\rundll32.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Classes\txtfile\shell\open\command\ = "notepad¢¬ %1" | C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe | N/A |
| Set value (int) | \REGISTRY\MACHINE\SOFTWARE\Classes\MSipv\MainSetup = "1717453782" | C:\Windows\system\rundll32.exe | N/A |
| Set value (int) | \REGISTRY\MACHINE\SOFTWARE\Classes\MSipv\MainUp = "1717453782" | C:\Windows\system\rundll32.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Classes\txtfile\shell\open\command\ = "notepad¢¬ %1" | C:\Windows\system\rundll32.exe | N/A |
| Key created | \REGISTRY\MACHINE\Software\Classes\exefile\shell\open\command | C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe | N/A |
| Key created | \REGISTRY\MACHINE\Software\Classes\txtfile\shell\open\command | C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Classes\txtfile\shell\open\command\ = "notepad.exe %1" | C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "¢« \"%1\" %*" | C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe | N/A |
| Key created | \REGISTRY\MACHINE\Software\Classes\MSipv | C:\Windows\system\rundll32.exe | N/A |
| Key created | \REGISTRY\MACHINE\Software\Classes\MSipv | C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "\"%1\" %*" | C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe | N/A |
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: GetForegroundWindowSpam
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system\rundll32.exe | N/A |
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe | N/A |
| N/A | N/A | C:\Windows\system\rundll32.exe | N/A |
| N/A | N/A | C:\Windows\system\rundll32.exe | N/A |
Suspicious use of WriteProcessMemory
Processes
C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe
"C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe"
C:\Windows\system\rundll32.exe
C:\Windows\system\rundll32.exe
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | www.zigui.org | udp |
| HK | 103.251.237.123:80 | www.zigui.org | tcp |
Files
memory/1640-0-0x0000000000400000-0x0000000000415A00-memory.dmp
C:\Windows\SysWOW64\notepad¢¬.exe
| MD5 | 95df74fea81a1875d23857a22ae315ef |
| SHA1 | f716e76af67d975f7e3b9ab36dfccf2088fbc8f0 |
| SHA256 | d117ff6080e2ee4744338f87c50c544bab1070fd9a6ff12911a7de62fce59261 |
| SHA512 | 4209449a0d6f7f0890c8bd7cad2cc86ac3e0b712e81eb0175046d2c455140b567e58af971072baf03ce814ce36df8eeedb4c65485429e39a729cc48ec29659fa |
\Windows\system\rundll32.exe
| MD5 | 6d46910a5f393a0549de8022e0739c3a |
| SHA1 | 36a16cb60a512008c0637bd7c1f0bc7542bd254f |
| SHA256 | 92e10836feb92a6bacd12263e1dc3c3c171a1152a8efdbd692b781d518c4cbda |
| SHA512 | 62fc8aa7dddd8cdd50bd13350710c7858455e9e9cee881f094d2f0cb04dc7eefa76d11fd609b44056b66d42258e33a7300205cdfe6bbd9ee60c1b071c3569a9e |
memory/2456-20-0x0000000000400000-0x0000000000415A00-memory.dmp
memory/1640-18-0x0000000000280000-0x0000000000296000-memory.dmp
memory/1640-17-0x0000000000280000-0x0000000000296000-memory.dmp
memory/1640-21-0x0000000000400000-0x0000000000415A00-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2024-06-03 22:29
Reported
2024-06-03 22:32
Platform
win10v2004-20240426-en
Max time kernel
149s
Max time network
144s
Command Line
Signatures
Executes dropped EXE
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system\rundll32.exe | N/A |
Modifies system executable filetype association
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "¢« \"%1\" %*" | C:\Windows\system\rundll32.exe | N/A |
| Key created | \REGISTRY\MACHINE\Software\Classes\exefile\shell\open\command | C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "\"%1\" %*" | C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "¢« \"%1\" %*" | C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe | N/A |
| Key created | \REGISTRY\MACHINE\Software\Classes\exefile\shell\open\command | C:\Windows\system\rundll32.exe | N/A |
Drops file in System32 directory
| Description | Indicator | Process | Target |
| File opened for modification | C:\Windows\SysWOW64\¢«.exe | C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe | N/A |
| File created | C:\Windows\SysWOW64\¢«.exe | C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe | N/A |
| File opened for modification | C:\Windows\SysWOW64\notepad¢¬.exe | C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe | N/A |
| File created | C:\Windows\SysWOW64\notepad¢¬.exe | C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe | N/A |
Drops file in Windows directory
| Description | Indicator | Process | Target |
| File opened for modification | C:\Windows\system\rundll32.exe | C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe | N/A |
| File created | C:\Windows\system\rundll32.exe | C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe | N/A |
Modifies registry class
| Description | Indicator | Process | Target |
| Key created | \REGISTRY\MACHINE\Software\Classes\txtfile\shell\open\command | C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe | N/A |
| Set value (int) | \REGISTRY\MACHINE\SOFTWARE\Classes\MSipv\MainUp = "1717453781" | C:\Windows\system\rundll32.exe | N/A |
| Key created | \REGISTRY\MACHINE\Software\Classes\MSipv | C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe | N/A |
| Key created | \REGISTRY\MACHINE\Software\Classes\exefile\shell\open\command | C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Classes\txtfile\shell\open\command\ = "notepad¢¬ %1" | C:\Windows\system\rundll32.exe | N/A |
| Key created | \REGISTRY\MACHINE\Software\Classes\MSipv | C:\Windows\system\rundll32.exe | N/A |
| Key created | \REGISTRY\MACHINE\Software\Classes\txtfile\shell\open\command | C:\Windows\system\rundll32.exe | N/A |
| Set value (int) | \REGISTRY\MACHINE\SOFTWARE\Classes\MSipv\MainSetup = "1717453781" | C:\Windows\system\rundll32.exe | N/A |
| Set value (int) | \REGISTRY\MACHINE\SOFTWARE\Classes\MSipv\MainVer = "506" | C:\Windows\system\rundll32.exe | N/A |
| Key created | \REGISTRY\MACHINE\Software\Classes\exefile\shell\open\command | C:\Windows\system\rundll32.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "¢« \"%1\" %*" | C:\Windows\system\rundll32.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Classes\txtfile\shell\open\command\ = "notepad.exe %1" | C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "¢« \"%1\" %*" | C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "\"%1\" %*" | C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Classes\txtfile\shell\open\command\ = "notepad¢¬ %1" | C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe | N/A |
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: GetForegroundWindowSpam
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system\rundll32.exe | N/A |
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe | N/A |
| N/A | N/A | C:\Windows\system\rundll32.exe | N/A |
| N/A | N/A | C:\Windows\system\rundll32.exe | N/A |
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 4368 wrote to memory of 2116 | N/A | C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe | C:\Windows\system\rundll32.exe |
| PID 4368 wrote to memory of 2116 | N/A | C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe | C:\Windows\system\rundll32.exe |
| PID 4368 wrote to memory of 2116 | N/A | C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe | C:\Windows\system\rundll32.exe |
Processes
C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe
"C:\Users\Admin\AppData\Local\Temp\cf03ea4c076c8ed7a44667f26ee57b135bf65acb50f48f3b574f61b2eb1a49cb.exe"
C:\Windows\system\rundll32.exe
C:\Windows\system\rundll32.exe
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | www.zigui.org | udp |
| HK | 103.251.237.123:80 | www.zigui.org | tcp |
| US | 8.8.8.8:53 | 149.220.183.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 240.197.17.2.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 75.159.190.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 209.205.72.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 104.219.191.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 50.23.12.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 206.23.85.13.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 249.197.17.2.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 14.227.111.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 0.204.248.87.in-addr.arpa | udp |
Files
memory/4368-0-0x0000000000400000-0x0000000000415A00-memory.dmp
C:\Windows\SysWOW64\notepad¢¬.exe
| MD5 | 7a0bedee251abcd48348aaee42113de0 |
| SHA1 | f4aacbf995c3616da4952683b51c2c89cf6456ed |
| SHA256 | cfab936d7b22263e1db52c4fd936838ee97c2768378c61554926756af1fd0231 |
| SHA512 | 9871154bf2da2b2fa7af99d277609de3f419a75fc1017ce1861933dbdc8ec435272c24c92d6d4757ab94bed3880976019beed8e308bfeb2eae8e1affb13ff2bd |
C:\Windows\System\rundll32.exe
| MD5 | dbb1d726b8b525c826a83cce48b8492a |
| SHA1 | 8a88983139910bcaeb59267c3051c181a5b90791 |
| SHA256 | 73f740f384b0d9340cc53eed9712290d0824c2cc3db3d2122f00e5402a3ce02b |
| SHA512 | 1e028c34199e519fa09b53dba863c47f8499319152d118052b40b214b7ea43a2b5d81be9f821fcce8958be58d2af79df48e1a0b087ef01c22561432b75b464bd |
memory/2116-13-0x0000000000400000-0x0000000000415A00-memory.dmp
memory/4368-14-0x0000000000400000-0x0000000000415A00-memory.dmp