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Fc2-ppv-4512638-1.part1.rar -

| 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 |

unrar l FC2-PPV-4512638-1.part1.rar > archive_filelist.txt

| Item | Value | |------|-------| | File | `FC2-PPV-451 FC2-PPV-4512638-1.part1.rar

Create or apply existing YARA rules to the extracted files and the final binary: | Task | Command | |------|---------| | Compute

rule FC2_PPV_Sample 
    meta:
        description = "Possible malicious payload from FC2‑PPV‑4512638 archive"
        author      = "Your Name"
        date        = "2026-04-16"
    strings:
        $a = "FC2-PPV" nocase
        $b =  68 ?? ?? ?? ?? 68 ?? ?? ?? ?? 6A 00 6A 00 
        $c = /http[s]?:\/\/[0-9a-f]8,\.com/
    condition:
        any of ($a, $b, $c)

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. | Item | Value | |------|-------| | File

| 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 |

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.