Analysis Overview
SHA256
031f10cbf44a49a9b60f16d7226a790338989e8721bc69bf6d4cd3df9977aed4
Threat Level: Known bad
The file skuld.exe was found to be: Known bad.
Malicious Activity Summary
Skuld family
Adds Run key to start application
Unsigned PE
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Views/modifies file attributes
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-11-07 00:26
Signatures
Skuld family
Unsigned PE
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Analysis: behavioral1
Detonation Overview
Submitted
2024-11-07 00:26
Reported
2024-11-07 00:29
Platform
win10v2004-20241007-en
Max time kernel
91s
Max time network
145s
Command Line
Signatures
Adds Run key to start application
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\USER\S-1-5-21-493223053-2004649691-1575712786-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Realtek HD Audio Universal Service = "C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\Protect\\SecurityHealthSystray.exe" | C:\Users\Admin\AppData\Local\Temp\skuld.exe | N/A |
Suspicious use of AdjustPrivilegeToken
| Description | Indicator | Process | Target |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Local\Temp\skuld.exe | N/A |
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 2700 wrote to memory of 2052 | N/A | C:\Users\Admin\AppData\Local\Temp\skuld.exe | C:\Windows\system32\attrib.exe |
| PID 2700 wrote to memory of 2052 | N/A | C:\Users\Admin\AppData\Local\Temp\skuld.exe | C:\Windows\system32\attrib.exe |
Views/modifies file attributes
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\attrib.exe | N/A |
Processes
C:\Users\Admin\AppData\Local\Temp\skuld.exe
"C:\Users\Admin\AppData\Local\Temp\skuld.exe"
C:\Windows\system32\attrib.exe
attrib +h +s C:\Users\Admin\AppData\Local\Temp\skuld.exe
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | 8.8.8.8.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 13.86.106.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 67.209.201.84.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 73.31.126.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 95.221.229.192.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 241.150.49.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 56.163.245.4.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 206.23.85.13.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 73.190.18.2.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 79.190.18.2.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 48.229.111.52.in-addr.arpa | udp |
Files
Analysis: behavioral2
Detonation Overview
Submitted
2024-11-07 00:26
Reported
2024-11-07 00:29
Platform
macos-20241106-en
Max time kernel
71s
Max time network
125s
Command Line
Signatures
Processes
/bin/sh
[sh -c sudo /bin/zsh -c "/Users/run/skuld.exe"]
/bin/bash
[sh -c sudo /bin/zsh -c "/Users/run/skuld.exe"]
/usr/bin/sudo
[sudo /bin/zsh -c /Users/run/skuld.exe]
/bin/zsh
[/bin/zsh -c /Users/run/skuld.exe]
/Users/run/skuld.exe
[/Users/run/skuld.exe]
/usr/bin/bzip2
[/usr/bin/bzip2 -f /var/log/wifi.log.0]
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | lb._dns-sd._udp.0.0.127.10.in-addr.arpa | udp |