GrabThePhisher

MITRE ATT&CK

Scenario

A decentralised finance (DeFi) platform reported multiple user complaints about unauthorised fund withdrawals. A forensic review uncovered a phishing site impersonating the legitimate PancakeSwap exchange — luring victims into entering their wallet seed phrases. The phishing kit was hosted on a compromised server and exfiltrated credentials via a Telegram bot. The objective was to conduct threat intelligence analysis on the phishing infrastructure, identify IOCs, and track the attacker’s online presence including aliases and Telegram identifiers.

Tooling

• Browser-based static analysis of phishing kit source files
• Telegram Bot API
• SypexGeo API review

Investigation Findings

1. Phishing Kit Structure

The extracted phishing kit impersonated PancakeSwap’s wallet connection interface. The kit presents victims with a “Connect Wallet” dialogue offering multiple wallet options — Metamask, Binance Wallet, Trust Wallet, WalletConnect, and others. However, only the Metamask option was functional and routed victims to the credential harvesting page.

The phishing flow is designed to request the victim’s wallet seed phrase under the guise of “importing an account.”

2. Malicious Code Analysis

The core phishing logic resided in metamask.php — a PHP script that handled seed phrase collection, geolocation enrichment, and Telegram exfiltration.

Key functionality in metamask.php:

• Captures submitted seed phrases via $_POST["import-account__secret-phrase"]
• Calls http://api.sypexgeo.net/json/ to retrieve victim geolocation data (country, city) and date
• Enriches the log message with victim IP via $_SERVER['REMOTE_ADDR'] and user agent via $_SERVER['HTTP_USER_AGENT']
• Appends collected credentials to log/log.txt on the server
• Immediately exfiltrates the seed phrase to a Telegram bot via sendTel()

The sendTel() function constructs a Telegram Bot API call to deliver each captured seed phrase directly to the attacker’s channel in real time. —

3. Credential Harvest

Inspection of log.txt revealed 3 seed phrases had already been collected prior to analysis. An example recovered phrase:

father also recycle embody balance concert mechanic believe owner pair muffin hockey

Each entry would have been accompanied by victim IP, geolocation, and user agent — giving the attacker enough context to target victims geographically or by browser fingerprint.

example father also recycle embody balance concert mechanic believe owner pair muffin hockey

4. C2 Infrastructure — Telegram Exfiltration

The kit used the Telegram Bot API as its C2 exfiltration channel — a common technique as Telegram traffic blends into normal HTTPS traffic and the bot API requires no infrastructure beyond an account.

Extracted from metamask.php:

Bot Token : 5457463144:AAG8t4k7e2ew3tTi0IBShcWbSia0Irvxm10
Chat ID   : 5442785564

The sendMessage endpoint was called with each new victim submission, meaning the attacker received seed phrases in real time via their Telegram client.

5. Attribution

The phishing kit contained a developer signature embedded in the source:

j1j1b1s@m3r0

This alias represents the kit developer or seller. Phishing kits are commonly sold or shared in underground markets — this signature is used to identify the original author and may appear across multiple campaigns using the same kit.

IOCs

Conclusion

The GrabThePhisher kit is a lean, effective PHP-based credential harvester targeting cryptocurrency users via a convincing PancakeSwap impersonation. Seed phrases were exfiltrated immediately via Telegram, bypassing any need for attacker-controlled server infrastructure for C2. The use of SypexGeo for victim enrichment suggests the attacker was profiling targets — potentially for geographic filtering or to avoid collecting from specific regions. The embedded developer alias j1j1b1s@m3r0 provides an attribution thread for further OSINT.

I successfully completed GrabThePhisher Blue Team Lab at @CyberDefenders! https://cyberdefenders.org/blueteam-ctf-challenges/achievements/inksec/grabthephisher/

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