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38 lines
1.2 KiB
YAML
38 lines
1.2 KiB
YAML
title: Telegram API Access
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id: b494b165-6634-483d-8c47-2026a6c52372
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status: experimental
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description: Detects suspicious requests to Telegram API without the usual Telegram User-Agent
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author: Florian Roth
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date: 2018/06/05
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modified: 2020/09/03
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references:
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- https://researchcenter.paloaltonetworks.com/2018/03/unit42-telerat-another-android-trojan-leveraging-telegrams-bot-api-to-target-iranian-users/
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- https://blog.malwarebytes.com/threat-analysis/2016/11/telecrypt-the-ransomware-abusing-telegram-api-defeated/
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- https://www.welivesecurity.com/2016/12/13/rise-telebots-analyzing-disruptive-killdisk-attacks/
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logsource:
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category: proxy
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detection:
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selection:
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r-dns:
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- 'api.telegram.org' # Often used by Bots
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filter:
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c-useragent|contains:
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# Used https://core.telegram.org/bots/samples for this list
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- 'Telegram'
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- 'Bot'
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condition: selection and not filter
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fields:
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- ClientIP
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- c-uri
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- c-useragent
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falsepositives:
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- Legitimate use of Telegram bots in the company
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level: medium
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tags:
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- attack.defense_evasion
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- attack.command_and_control
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- attack.t1071.001
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- attack.t1043 # an old one
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- attack.t1102.002
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- attack.t1102 # an old one
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