Theft of login credentials in crypto: what methods do modern scammers use?

When analyzing cases of lost crypto assets, the same conclusion repeatedly emerges: most attacks do not exploit technical vulnerabilities of the system, but rather user naivety. In forensic practice, we rarely see classic cases of system or wallet breaches; “hacks”. Much more often, these are situations where the user (often completely unknowingly) has enabled access or confirmed a malicious transaction themselves.

These cases fall into the category of credential or transaction theft. Broadly, they can be divided into three dominant models:

• the user reveals data due to social engineering (phishing / seed phrase theft),
• the user sends funds to the wrong address due to address manipulation (address poisoning),
• the user signs a transaction (smart contract) that allows the attacker to drain the wallet (crypto drainer).

Although they differ technically, they share a common feature: the attacker guides the user through a process that appears legitimate. For crypto asset holders, it is important to understand and distinguish different attack approaches used by scammers. Only with sufficient knowledge can they anticipate these common scam patterns and recognize subtle but critical details that reveal them.

1. Phishing / Seed Phrase Theft

Phishing represents the most direct and at the same time the most destructive scenario: the attacker obtains the seed phrase or private key. At that moment, the user irreversibly loses control over the assets tied to that seed phrase, and the attacker fully takes over the wallet.

‍How the attack actually unfolds

In the vast majority of cases, the user does not feel like they are doing anything risky. On the contrary they believe they are solving a problem or taking advantage of a newly discovered, rare earning opportunity.

The attack often begins in a completely mundane way. The user is browsing emails, social media, or searching for access to a particular service. Then they click on a link found through an ad, social network, or most commonly via email, where the sender attempts to closely imitate a legitimate address (e.g. support@colnbase.com), promising “newly found funds” or a similarly fabricated offer designed to attract the user.

The website they land on is visually almost identical to the original. In forensic cases, we often see copies that match legitimate platforms down to the smallest detail. The only giveaway is often the URL, which differs slightly from the original, e.g. https://colnbase.com.

Then comes the key turning point of the scam. The page asks the user for “verification” or “account recovery.” In practice, this means entering the seed phrase. The user interprets this as a standard security procedure, especially if they have previously restored a wallet.

Another very common, similar approach involves direct contact. The user posts a problem on social media (e.g. Discord or Twitter), after which someone posing as support contacts them. The communication is professional, often even more responsive than real support. The attacker guides the conversation step by step until reaching the point where they “need” the seed phrase to resolve the issue.

In all these scenarios, one common element appears: a sense of legitimacy and often urgency. The user is told they must act quickly - either their account is at risk or they will lose access. This pressure significantly reduces critical judgment.

Once the user enters the seed phrase, the attack is practically complete. In forensic analyses, we often see funds moved within seconds or minutes.

How to defend yourself and what to do

The most important rule is simple: a seed phrase is never entered on third-party websites or shared with anyone. It is only entered into your own wallet via the official application or device (e.g. Ledger, Trezor, MetaMask app). No legitimate service would require entering a seed phrase through unknown platforms.

Users should access wallets exclusively via verified, directly entered URLs or saved bookmarks. Any “official support” that contacts you unprompted via private messages is, in practice, almost always malicious.

If disclosure already occurs, immediate action is required. If funds are still in the wallet, they must be transferred immediately to a new, uncompromised address. The seed phrase must be considered permanently compromised.

2. Address Poisoning

Address poisoning is a significantly more subtle technique. The attacker does not need access to your data but instead manipulates how the user selects a wallet address for sending funds.

It exploits a deeply ingrained habit: most users do not verify the entire address, but only the first and last few characters.

How the attack actually unfolds

The attacker first creates an address that is visually very similar to one the user frequently interacts with. This means it has the same starting and ending characters—the middle is different.
They then send a transaction with negligible value (often even 0) to the user’s wallet. This transaction appears in the transaction history.

Later, when the user wants to send funds again to a “known” address, they do not search for the original source but instead open the transaction history. There, they see an address that looks familiar at first glance. Without further verification, they copy and use it.
At that moment, the mistake is already made. The transaction is signed and the funds are sent to the attacker’s address.

What makes this attack particularly dangerous is the absence of classic warning signs such as fake websites or suspicious communication. It is purely manipulation of user routine.

How to defend yourself and what to do

The key defense is changing habits. Addresses should not be copied from transaction history but from verified sources. When sending funds - especially larger amounts - always verify the entire address, not just the beginning or end.

Using features such as an address book or whitelist significantly reduces risk. Using QR codes also helps, as the chance of error is lower.

If a transaction to the wrong wallet address is executed, options are limited since blockchain transactions are irreversible. The best response is tracking the funds and attempting to freeze them with professional assistance.

3. Crypto Drainer (Wallet Drainer)

Crypto drainers represent one of the more widespread and technically sophisticated types of attacks. The approach is very similar to address poisoning, except instead of imposing a fake address, the attacker uses a malicious smart contract that the user authorizes to transfer funds.

How the attack actually unfolds

The user visits a site offering NFT minting, token claims, or participation in a DeFi project. The approach initially resembles classic phishing scams, with attackers posing as official profiles, services, or product links. However, the key difference lies in execution: the attacker does not request any direct data, which reduces suspicion.

The user connects their wallet. This alone is not yet dangerous. The critical moment occurs when the application requests a transaction signature. This is justified with fabricated reasons, often presented as a minor, routine step.

The wallet interface typically shows very limited information: “Approve,” “Sign,” and similar, without clearly explaining consequences. Most users perceive this step as a formality.

In the background, however, the signature often means one of two things:

• the attacker receives permission to manage certain tokens (so-called allowance),
• or the user directly approves a transaction that transfers funds.

After signing, the process is automated. Drainer scripts analyze the wallet within seconds and execute a series of transactions that drain all available tokens, coins, and potentially NFTs covered by the signed smart contract. In more advanced cases, they also target multiple networks.

Particularly deceptive is that the user often does not realize at the moment of signing that they have been scammed. The consequences become apparent only later, when the funds are already gone.

How to defend yourself and what to do

The most effective protection is caution when connecting wallets to unknown applications. Any interaction requiring a signature should be subject to basic verification—especially whether the project or service is legitimate and whether the URL is correct.

It is important to understand that signing a smart contract is not just an innocent click—it can grant full access to a specific type of asset within a wallet.

A good practice is separating funds:

• One wallet for interactions - with no stored funds,
• Another wallet for storage - with funds kept isolated (safer, no connections).

In most cases, this prevents execution of malicious contracts, as they cannot directly access the majority of assets.

If an attack occurs, all approvals must be revoked immediately and remaining funds transferred. This is followed by transaction analysis and potentially fund tracing. Time is critical here as well.

What next?

For each type of scam, there are ways to avoid it, what to watch for, and how to minimize initial damage. Most defenses rely on careful verification of sources, provided data, and skepticism toward any non-routine request for personal information.

All scams also share the characteristic that once executed, funds are quickly and deliberately dispersed across blockchains, often via mixers, bridges, and multiple sequential wallets. The purpose of such transfers is to obscure the trail and make linking transactions into a coherent whole more difficult. Tracking is therefore no longer a trivial review of public records but requires in-depth analysis of transaction patterns, time correlations, and connections between addresses. Complexity also increases on the legal level, as effective action requires identifying the right moment to engage regulated entities and initiating appropriate procedures to temporarily freeze the funds.

In cases where preventive measures were insufficient and funds have already been moved, a fast and structured response is crucial. In practice, this means immediate forensic analysis, identification of fund flows, and preparation of technically and legally usable reports that enable further action with exchanges and law enforcement. This is where specialized crypto recovery teams play a role, as they have experience reconstructing complex fund flows and understand how to translate this data into concrete steps for damage mitigation and potential recovery.

In such cases, where even preventive measures have failed and the funds appear lost, it is advisable to contact professionals specialized in services required for these situations.