Analysis Overview
SHA256
c7fc7b8e258d4838544c2b70f292e37d1e9a9ad6ae74c8d8bd167d9d2392f636
Threat Level: Known bad
The file trx40.zip was found to be: Known bad.
Malicious Activity Summary
FatalRat
Fatalrat family
Fatal Rat payload
Enumerates connected drives
Unsigned PE
Program crash
System Location Discovery: System Language Discovery
Suspicious use of WriteProcessMemory
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Checks processor information in registry
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2025-02-24 10:06
Signatures
Unsigned PE
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Analysis: behavioral4
Detonation Overview
Submitted
2025-02-24 10:06
Reported
2025-02-24 10:08
Platform
win10v2004-20250217-en
Max time kernel
148s
Max time network
149s
Command Line
Signatures
Program crash
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\WerFault.exe | C:\Windows\SysWOW64\rundll32.exe |
System Location Discovery: System Language Discovery
| Description | Indicator | Process | Target |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language | C:\Windows\SysWOW64\rundll32.exe | N/A |
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 2180 wrote to memory of 3872 | N/A | C:\Windows\system32\rundll32.exe | C:\Windows\SysWOW64\rundll32.exe |
| PID 2180 wrote to memory of 3872 | N/A | C:\Windows\system32\rundll32.exe | C:\Windows\SysWOW64\rundll32.exe |
| PID 2180 wrote to memory of 3872 | N/A | C:\Windows\system32\rundll32.exe | C:\Windows\SysWOW64\rundll32.exe |
Processes
C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\package\PotPlayer.dll,#1
C:\Windows\SysWOW64\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\package\PotPlayer.dll,#1
C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 412 -p 3872 -ip 3872
C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 3872 -s 820
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | tse1.mm.bing.net | udp |
| US | 150.171.27.10:443 | tse1.mm.bing.net | tcp |
| US | 150.171.27.10:443 | tse1.mm.bing.net | tcp |
Files
Analysis: behavioral1
Detonation Overview
Submitted
2025-02-24 10:06
Reported
2025-02-24 10:08
Platform
win7-20240903-en
Max time kernel
135s
Max time network
145s
Command Line
Signatures
FatalRat
Fatalrat family
Fatal Rat payload
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
| N/A | N/A | N/A | N/A |
Enumerates connected drives
System Location Discovery: System Language Discovery
| Description | Indicator | Process | Target |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language | C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe | N/A |
Checks processor information in registry
| Description | Indicator | Process | Target |
| Key opened | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 | C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe | N/A |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz | C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe | N/A |
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
| Description | Indicator | Process | Target |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe | N/A |
Processes
C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe
"C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe"
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | hm.weilay.com.cn | udp |
| HK | 43.132.244.128:8081 | tcp | |
| US | 8.8.8.8:53 | hm.weilay.com.cn | udp |
| HK | 47.239.83.12:1527 | hm.weilay.com.cn | tcp |
| HK | 43.132.244.128:8081 | tcp | |
| HK | 43.132.244.128:8081 | tcp | |
| HK | 43.132.244.128:8081 | tcp | |
| HK | 43.132.244.128:8081 | tcp |
Files
memory/2664-1-0x0000000001DF0000-0x0000000001E22000-memory.dmp
memory/2664-2-0x0000000001E90000-0x0000000001ECB000-memory.dmp
memory/2664-3-0x00000000003D0000-0x00000000003FA000-memory.dmp
memory/2664-8-0x0000000001E90000-0x0000000001ECB000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2025-02-24 10:06
Reported
2025-02-24 10:08
Platform
win10v2004-20250217-en
Max time kernel
135s
Max time network
144s
Command Line
Signatures
FatalRat
Fatalrat family
Fatal Rat payload
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
| N/A | N/A | N/A | N/A |
Enumerates connected drives
System Location Discovery: System Language Discovery
| Description | Indicator | Process | Target |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language | C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe | N/A |
Checks processor information in registry
| Description | Indicator | Process | Target |
| Key opened | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 | C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe | N/A |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz | C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe | N/A |
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
| Description | Indicator | Process | Target |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe | N/A |
Processes
C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe
"C:\Users\Admin\AppData\Local\Temp\package\MaskDoc.exe"
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | hm.weilay.com.cn | udp |
| US | 8.8.8.8:53 | hm.weilay.com.cn | udp |
| HK | 43.132.244.128:8081 | tcp | |
| HK | 47.239.83.12:1527 | hm.weilay.com.cn | tcp |
| HK | 43.132.244.128:8081 | tcp | |
| HK | 43.132.244.128:8081 | tcp | |
| HK | 43.132.244.128:8081 | tcp | |
| HK | 43.132.244.128:8081 | tcp |
Files
memory/3212-2-0x00000000024B0000-0x00000000024EB000-memory.dmp
memory/3212-1-0x0000000002340000-0x0000000002372000-memory.dmp
memory/3212-3-0x0000000000530000-0x000000000055A000-memory.dmp
memory/3212-8-0x00000000024B0000-0x00000000024EB000-memory.dmp
Analysis: behavioral3
Detonation Overview
Submitted
2025-02-24 10:06
Reported
2025-02-24 10:08
Platform
win7-20240903-en
Max time kernel
119s
Max time network
119s
Command Line
Signatures
Program crash
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\WerFault.exe | C:\Windows\SysWOW64\rundll32.exe |
System Location Discovery: System Language Discovery
| Description | Indicator | Process | Target |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language | C:\Windows\SysWOW64\rundll32.exe | N/A |
Suspicious use of WriteProcessMemory
Processes
C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\package\PotPlayer.dll,#1
C:\Windows\SysWOW64\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\package\PotPlayer.dll,#1
C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 2344 -s 352