Bot not detecting SPAM. new_chat_members chat_member chat_join_request

[ortegafernando]

Hi, I have telegrambot as an admin in several telegram groups. I used to easily detect when someone wanted to join the group and ask him/her typical captch questions before let her/him join in or ban her/him for a while.

But now, with some very special spammers… there’s no way. I only know they’re premium, but none of these three events “fires” like before:

• new_chat_members in reciever node
• chat_member event node
• chat_join_request event node.

Of course, meanwhile, "normal" users are "detected" perfectly.

These new spammers become undetectable for me. Of course, the error is hard to reproduce.

Does anyone know how these spammers manage to make Telegram not trigger these events?

Any solution, key, ... to solve this? (as you can see, they usually changes the message)

Thanks.

Hello! 
New project. Completely legal.
Everything is done online. Transparent terms!

Send me a message: [@MateoG7](https://t.me/MateoG7)

Hello!
New project. Entirely online.
Looking for 2–3 people to join the team. Spots are limited!

Send me a message at [@MateoG7](https://t.me/MateoG7)

Hello! 
I'm looking for 2–3 motivated people over the age of 19 to join the team.
All activities is done online!

Интересно? Send [@AndreaVaal](https://t.me/AndreaVaal) a private message!

Hello!
Looking for 2-3 people to join the team. (19+)
All activities are online. Stable results!

Interested? Write to [@RowanWhoKnows](https://t.me/RowanWhoKnows)

[windkh]

@ortegafernando
well in that case it would be interesting what raw message is received. Or if any message is received by the bot.

Here you can read what message types are available.
https://core.telegram.org/bots/api#update

The lower layer lib could probably swallow some...
Let's find out.

[windkh]

@ortegafernando the lower layer lib provides the following:

const _messageTypes = [
  'text',
  'animation',
  'audio',
  'channel_chat_created',
  'contact',
  'delete_chat_photo',
  'dice',
  'document',
  'game',
  'group_chat_created',
  'invoice',
  'left_chat_member',
  'location',
  'migrate_from_chat_id',
  'migrate_to_chat_id',
  'new_chat_members',
  'new_chat_photo',
  'new_chat_title',
  'passport_data',
  'photo',
  'pinned_message',
  'poll',
  'sticker',
  'successful_payment',
  'supergroup_chat_created',
  'video',
  'video_note',
  'voice',
  'video_chat_started',
  'video_chat_ended',
  'video_chat_participants_invited',
  'video_chat_scheduled',
  'message_auto_delete_timer_changed',
  'chat_invite_link',
  'chat_member_updated',
  'web_app_data',
  'message_reaction'
];

and the following from the code
edited_message
edited_message_text
edited_message_caption
channel_post
edited_channel_post
edited_channel_post_text
edited_channel_post_caption
business_connection
business_message
edited_business_message
deleted_business_messages
message_reaction
message_reaction_count
inline_query
chosen_inline_result
callback_query
shipping_query
pre_checkout_query
poll
poll_answer
chat_member
my_chat_member
chat_join_request
chat_boost
removed_chat_boost

[windkh]

The following updates are missing and may be added in the next verison

purchased_paid_media

--> not relevant for this discussion

[windkh]

Can anyone enter the chat using an invite link?

[ortegafernando]

Can anyone enter the chat using an invite link?

Probably not. Could it be a “spammer” user who is already in the group as a "ghost" and is inviting these other premium users?
Is that a possibility?

Usually they don’t leave on their own — sometimes I need to ban and kick them. Some of them are banned in lots of groups, so if I’m late, they appear as a deleted account by telegram.

As you can see, Jimena’s status is “member”, so "Jimena never entered the chat" is not true , but I have no idea how she has entered !

[windkh]

For that reason we need the full raw log. I will mofify the bot then we can test

[ortegafernando]

I can try to monitor "more" and "record" more log. I need to wait until another spammer "joins" the group. Is there any way to make a more complete log? have you talked about "I could extend the node in a way so that it simply emits every raw message received… maybe we can see anything" MAy be this could help to find a solution. I’m really puzzled about how these users manage to enter the group and post without triggering the “new_chat_members” message.

[ortegafernando]

For that reason we need the full raw log. I will mofify the bot then we can test

Ok, we have just answered at the same time. Thanks a lot.

[windkh]

Do you use polling or webhook

[ortegafernando]

Polling, 300ms.

First of all I thought about an user joining the group, send a message and leave the group in miliseconds so my bot even don't recieve the new_chat_members message-type ... but as you can see, user is member even after 2 minutes from the first message.

[windkh]

@ortegafernando with the next update you can enable this and get all raw updates received from the telegram server

[windkh]

@ortegafernando Version 17.1.3

If you find updates from your bot from chats the bot should never be in... then you can make it leave from that chat via
https://api.telegram.org/bot<YOUR_BOT_TOKEN>/leaveChat?chat_id=<CHAT_ID>

[ortegafernando]

Thanks a lot !!!!

I have just updated to 17.1.3, and I am recording in a log file all "originalMessage" and "payload", let's wait until an spammer appears again. I hope today 😒. The only thing I am doing not to collapse my log file, it is to filter previously by "payload.chatId", any problem with this filter? Thanks

[windkh]

@ortegafernando just filter for type : 'update'. There is no original message in this type of message. Just attach a debug node and have a look at the output

[ortegafernando]

Hi, I have taken one. Even I have banned and kick off her, in the update "log" I can't not get more messages than these:

2026-03-28 11:09:47	{"type":"update","content":{"update_id":578352167,"message":{"message_id":74155,"from":{"id":908433991,"is_bot":false,"first_name":"Vittoria","last_name":"Santangelo","username":"VittoriaSan","is_premium":true},"chat":{"id":-1001765750XXX,"title":"XXX","username":"XXX","type":"supergroup"},"date":1774696187,"text":"Hello!\nI'm looking for a few people to join our team. (19+)\nCompletely online. Official platforms only.\n\nInterested? Message me at @ MateoG7"}}}

2026-03-28 11:09:47	{"chatId":-1001765750XXX,"messageId":74155,"type":"message","content":"Hello!\nI'm looking for a few people to join our team. (19+)\nCompletely online. Official platforms only.\n\nInterested? Message me at @ MateoG7","date":1774696187}

The previous one is:

2026-03-28 11:05:34	{"chatId":-1001765750XXX,"messageId":74154,"type":"photo","content":"AgACAgQAAx0CaT84zwABASGqace1_fozlaMIubdx8WMKY8CSBPIAAnoNaxvYnUBSmLz_VcKTaQABAQADAgADeQADOgQ","date":1774695934,"blob":true,"photos":[{"file_id":"AgACAgQAAx0CaT84zwABASGqace1_fozlaMIubdx8WMKY8CSBPIAAnoNaxvYnUBSmLz_VcKTaQABAQADAgADcwADOgQ","file_unique_id":"AQADeg1rG9idQFJ4","file_size":1898,"width":90,"height":68},{"file_id":"AgACAgQAAx0CaT84zwABASGqace1_fozlaMIubdx8WMKY8CSBPIAAnoNaxvYnUBSmLz_VcKTaQABAQADAgADbQADOgQ","file_unique_id":"AQADeg1rG9idQFJy","file_size":38731,"width":320,"height":241},{"file_id":"AgACAgQAAx0CaT84zwABASGqace1_fozlaMIubdx8WMKY8CSBPIAAnoNaxvYnUBSmLz_VcKTaQABAQADAgADeAADOgQ","file_unique_id":"AQADeg1rG9idQFJ9","file_size":226582,"width":800,"height":602},{"file_id":"AgACAgQAAx0CaT84zwABASGqace1_fozlaMIubdx8WMKY8CSBPIAAnoNaxvYnUBSmLz_VcKTaQABAQADAgADeQADOgQ","file_unique_id":"AQADeg1rG9idQFJ-","file_size":466461,"width":1280,"height":963}],"mediaGroupId":"14197567471311980","weblink":"https://api.telegram.org/file/bot6064063877:AAGvv08j9kug2fwJ6gHn2ji9M_1vRSpQ_Yc/photos/file_6354.jpg"}

No more messages... 🤷‍♀️, no new_chat_members.... this is very strange, isn't it?

But may be I am doing something wrong. I get all messages from my bot, and in a json node (Always convert to json string) I convert payload to json in order to save it in a log file. May be I am losing some messages this way. But I think that all your updates messages have payload, so JSON NODE is working perfectly.

I make with log file, because it is dificult to be "online" with debug nodes to take the spam message.

May be this weekend I could get an spam message in my debug nodes "on-live". I will write here if I get success.

[windkh]

The type ‚update‘ is the lowest possible message in the stack that you can get. If the telegram server does not send any other messages, then I assume that somebody who is already a member of that chat found somehow a way to send messages under a different name. Yes that is strange. Maybe it would be a good idea to contact the telegram guys asking them for their help.

[ortegafernando]

Hi @windkh I have tried again to get an answer, but not luck. Difference between a "normal user" and a "spam user".

2026-03-29 09:39:22	{"type":"update","content":{"update_id":578352267,"message":{"message_id":74245,"from":{"id":950602560,"is_bot":false,"first_name":"Jeanreno","username":"Jeanreno74"},"chat":{"id":-1001765750XXX,"title":"XXX","username":"XXX","type":"supergroup"},"date":1774777162,"new_chat_participant":{"id":950602560,"is_bot":false,"first_name":"Jeanreno","username":"Jeanreno74"},"new_chat_member":{"id":950602560,"is_bot":false,"first_name":"Jeanreno","username":"Jeanreno74"},"new_chat_members":[{"id":950602560,"is_bot":false,"first_name":"Jeanreno","username":"Jeanreno74"}]}}}
2026-03-29 09:39:22	{"chatId":-1001765750XXX,"messageId":74245,"type":"new_chat_members","content":[{"id":950602560,"is_bot":false,"first_name":"Jeanreno","username":"Jeanreno74"}],"user":{"id":950602560,"is_bot":false,"first_name":"Jeanreno","username":"Jeanreno74"},"date":1774777162}

2026-03-30 13:42:57	{"type":"update","content":{"update_id":578352355,"message":{"message_id":74327,"from":{"id":1217414797,"is_bot":false,"first_name":"Clarissa","last_name":"Venturi","username":"ClarissaVen","is_premium":true},"chat":{"id":-1001765750XXX,"title":"XXX","username":"XXX","type":"supergroup"},"date":1774878176,"text":"Only 2 positions open!\nFully remote — all you need is your phone\nNo office job, no PC required, flexible hours\nStart making €290+ per week right away\nOpen for ages 18–65, no prior experience needed\n\n📩 Interested?\nSend a “+” via private message → @ MateoG7"}}}
2026-03-30 13:42:57	{"chatId":-1001765750XXX,"messageId":74327,"type":"message","content":"Only 2 positions open!\nFully remote — all you need is your phone\nNo office job, no PC required, flexible hours\nStart making €290+ per week right away\nOpen for ages 18–65, no prior experience needed\n\n📩 Interested?\nSend a “+” via private message → @ MateoG7","date":1774878176}

What is the best place to ask to telegram guys? I will wait an answer, an of course, update here the information

[ortegafernando]

@windkh I have opened here:

https://bugs.telegram.org/c/60592

But... I have not luck until today. No answer.