Extract the Files:
Using 7-Zip (Windows, macOS, Linux):
| Task | Command |
|------|---------|
| Compute SHA‑256 for every file | find . -type f -exec sha256sum {} \; > all_hashes.txt |
| List archive contents (no extraction) | unrar l FC2-PPV-4512638-1.part1.rar |
| Test integrity of multi‑part archive | unrar t FC2-PPV-4512638-1.part1.rar |
| Extract quietly (no prompts) | unrar x -y FC2-PPV-4512638-1.part1.rar ./extracted/ |
| Dump strings of a binary | strings -a -n 6 suspicious.exe > suspicious_strings.txt |
| Check PE entropy | peframe suspicious.exe | grep Entropy |
| Quick YARA scan | yara -r myrules.yar ./extracted/ |
| Capture network traffic (5 min) | tcpdump -i any -w capture.pcap -G 300 -W 1 | FC2-PPV-4512638-1.part1.rar
Only run the files in a controlled sandbox. Never execute on a production or internet‑connected host unless you are certain the environment is fully isolated. Extract the Files :
| Step | Action | Tool / Configuration |
|------|--------|----------------------|
| 5.1 | Launch the primary executable (or double‑click the media file) | Cuckoo Sandbox, REMnux VM, or any sandbox with API logging |
| 5.2 | Monitor file system changes | procmon (Windows) / inotifywait (Linux) |
| 5.3 | Observe registry modifications | procmon filter “Registry” |
| 5.4 | Capture network traffic | Wireshark, tcpdump, or sandbox built‑in network dump |
| 5.5 | Record process tree & command line | process explorer, ps aux |
| 5.6 | Dump memory if needed | Volatility (Windows) / gcore (Linux) |
| 5.7 | Look for dropped payloads | Search the sandbox’s output/dropped directory | Using 7-Zip (Windows, macOS, Linux) :
Typical artefacts to note
/* -------------------------------------------------------------
* Generic FC2‑PPV malicious archive family
* ------------------------------------------------------------- */
rule FC2_PPV_Archive
meta:
description = "Detects files dropped from the FC2‑PPV‑4512638 RAR series"
author = "Your Name"
date = "2026-04-16"
reference = "internal-analysis-2026-04-16"
strings:
$fn1 = "FC2-PPV-" nocase
$url = /https?:\/\/[a-z0-9-]5,\.example\.com\/[a-z0-9]8,/
$reg = /Run\\.*FC2-PPV/
$packed = 60 8B ?? ?? ?? 83 C4 ?? 5F 5E 5D C3
condition:
any of ($fn1, $url, $reg, $packed)
Feel free to adjust the rule to match any additional indicators you uncover.
unrar t FC2-PPV-4512638-1.part1.rar