Author: OTW, Hackers-Arise
Published: February 20, 2025
Source: https://hackers-arise.com/open-source-intelligence-or-osint-you-cant-hide-on-telegram/
Summary
This Hackers-Arise article challenges the common belief that Telegram provides anonymity, walking through open-source intelligence (OSINT) techniques used to identify and de-anonymize Telegram users and to locate information across the platform. It is an educational OSINT/reconnaissance piece rather than a vulnerability writeup — there is no CVE and no software exploit; the point is that ordinary, publicly observable Telegram metadata, combined and cross-referenced, can unmask and profile a user. This summary describes the categories of technique and their privacy implications for awareness and defensive purposes; it deliberately does not reproduce the article’s specific de-anonymization bots, leaked-data lookup services, or search queries, since those function as an operational unmasking toolkit.
Technical Details
The article’s central observation is that a Telegram account carries a persistent numeric identifier. Usernames, display names, and even phone numbers can be changed freely, but the internal Telegram ID assigned at registration does not change — so changing a handle does not sever the link to prior activity, and various helper bots can map a current username or channel back to that stable ID and estimate an account’s creation date. The remaining techniques are grouped into a few categories:
- Username and handle correlation. A Telegram
@usernameis a uniquet.me/link whose existence is trivially checkable, and because those links are indexed by search engines they are discoverable with search operators. A distinctive handle reused elsewhere lets an investigator pivot to other platforms and correlate identities. - Profile artifact analysis. The profile photo, display name, and bio are cross-referenced against outside sources — notably reverse image searches on the profile picture, plus background/landmark cues — to confirm or debunk an identity and to detect stolen or stock photos.
- Aggregated leak data and activity/membership lookups. The article points to third-party Telegram bots and (often paid) services that surface data drawn from breaches and that reveal which groups and chats a user belongs to and when they were last active. Group memberships in turn leak location (city-based chats), interests, and professional or social affiliations. This category is the most privacy-invasive and relies on breached/aggregated personal data.
- Content and channel discovery. Search-engine dorking of
t.melinks, tracking of unique invite links, channel-name operators, and Telegram-specific custom search engines are used to find channels, groups, and posts — and to surface content that admins left public by mistake.
Impact
The takeaway is that Telegram offers far less anonymity than users assume. Because a stable internal ID underlies mutable handles, and because profile artifacts, group memberships, public posts, and breach-sourced data can all be cross-correlated, a motivated investigator — or an adversary — can unmask a pseudonymous user, infer their location and affiliations, and reconstruct their activity. The article situates this in a real-world context (Telegram’s prominence in the Russia–Ukraine conflict), which underscores the stakes for journalists, activists, and ordinary users in high-risk environments. This is a reconnaissance and privacy-exposure issue, not a flaw in Telegram’s software or its message encryption.
Mitigation
Framed defensively, the protective measures follow directly from the techniques:
- Assume the numeric account ID is permanent — changing your username or number does not reset your history, so compartmentalize sensitive activity into separate accounts rather than renaming one.
- Avoid reusing a distinctive
@usernameacross platforms; handle reuse is the easiest cross-platform correlation pivot. - Restrict profile visibility: set profile photo, “last seen”/online, and phone-number discovery to Contacts or Nobody, and avoid a real-name display name or an identifiable, reused profile photo for sensitive accounts.
- Be mindful that group and channel memberships leak location, interests, and affiliations; joining city- or interest-based public groups is itself an identifying signal.
- Treat invite links as trackable (they are unique and searchable) and assume anything posted in public channels is indexed and permanently discoverable.
- For organizations, include messaging-platform OSINT exposure in privacy reviews and threat models, and coach high-risk staff on these correlation risks.