Security Alert: Confirmed Malware

This extension was removed from the Chrome Web Store as malware. Do not install it.Extension: Seznam Doplněk – Esko

CRITICAL RISKRemoved from Chrome Web Store

Seznam Doplněk – Esko

ID: olfeabkoenfaoljndfecamgilllcpiak

Could be malicious

Supported Languages

🇨🇿Czech

Extension Info & Metadata

Status

Removed

Version

6.0.11

Size

0.45 MB

Rating

3.1/5

Reviews

Users

300,000

Type

Extension

Updated

Aug 9, 2023

Publisher Contextual Analysis

Author: https://www.seznam.czView Profile
Privacy: Privacy Policy
Help: Help Center
Country: CZ
MX records exist: Yes
Domain exists: Yes
Is disposable: No
Is role-based: No
Mailbox exists: Yes
Address: Radlická Praha 5 15000 CZ
Website: Visit

Total Extensions

Active

Obsolete

Listed

Unlisted

Total Users

500,000

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Nastaví do adresního řádku vašeho prohlížeče vyhledávač od Seznamu.

S doplňkem Esko máte domovskou stránku Seznam.cz vždy po ruce, stačí kliknout na červené Esko nebo otevřít nový panel. Také vás upozorní, když se pokusíte vstoupit na podvodnou stránku nebo nedůvěryhodný e-shop.

User Growth

Showing data from Jan 01, 2022 to Dec 31, 2022

Versions

No change in user count

Compared to 4 months ago

1 version released in this period

Rating Count

Total: 97 ratings

Average Rating

Current: 3.07 / 5.0

Extracted Data

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By severity

Critical1

High8

Medium3

Low0

Versions scanned

Showing 2 of 9 scanned versions with more than one unique finding. Counts are unique findings that include each version.

Extension Version	Code Review Findings
6.0.2 Code review	4
5.5.0 Code review	8

Extension Version	Code Review Findings
6.0.2	4
5.5.0	8

Files with findings

2 distinct paths — top paths by unique finding count:

static/js/background.js8
background.js4

S.No.	Category	Severity	File	Summary	Found in Version
1	Credential Theft	critical	static/js/background.js (line 2)	The migrator function accepts a plain-text email address and password from the user and transmits them directly to https://login.szn.cz/api/v1/oauth/grant with password_type:'md5'. This is a credential collection rout…	5.5.0
2	Data Exfiltration	high	static/js/background.js (line 2)	The extension retrieves stored OAuth access tokens for all signed-in email accounts and uses them to authenticate periodic email API calls. Authenticated requests are proxied through https://api.software.seznam.cz/coo…	5.5.0
3	Network Interception	high	background.js (line 2948)	This handler inspects each updated tab URL, compares it against a remotely supplied list, and forcibly redirects matching pages to an internal warning page. Even if intended as anti-phishing, it gives the extension th…	6.0.2
4	Privilege Escalation	high	background.js (line 2849)	The extension invokes a native messaging host named `sznpp_nm` and stores values returned from the local application into extension storage. Native messaging crosses the browser sandbox boundary and can enable host-le…	6.0.2
5	Privilege Escalation	high	static/js/background.js (line 2)	The extension communicates with a native host application named 'sznpp_nm' via chrome.runtime.sendNativeMessage, which bypasses the browser sandbox entirely. The nmGetInformation call retrieves a partnerId, signedHash…	5.5.0
6	Privilege Escalation	high	static/js/background.js (line 2)	The extension uses the chrome.management API to enumerate all installed browser extensions (their IDs and enabled states) on every startup, and has the capability to enable or disable a set of sibling extensions by th…	5.5.0
7	Tracking	high	background.js (line 2723)	This code builds a telemetry payload and sends it to a remote analytics endpoint. The payload contains a persistent SSID, partner ID, session history, browser details, and the extension ID, which is a strong tracking …	6.0.2
8	Tracking	high	static/js/background.js (line 2)	The Reporter class builds a GET beacon to https://h.seznam.cz/hit/? that includes the user's SSID, partnerID, browser name, extension version, session timestamps, and a JSON-serialized event payload. Events fired incl…	5.5.0
9	Unauthorized Data Collection	high	static/js/background.js (line 2)	On every browser startup the extension counts the number of signed-in email accounts and transmits that count to the remote tracking server. Additionally, a setInterval fires every 12 hours to report the enabled/disab…	5.5.0
10	Network Interception	medium	background.js (line 2987)	The blocklist used for URL interception is fetched from a remote server on a recurring alarm. That means the vendor can change which domains or URL patterns are blocked at any time without an extension update, creatin…	6.0.2
11	Tracking	medium	static/js/background.js (line 2)	The extension assigns a fixed affiliate/tracking partnerID (62744 for Chrome, 62747 for Firefox) that is appended as a ?clid= query parameter to every navigation to seznam.cz. This partnerID is also shared with the na…	5.5.0
12	Unauthorized Data Collection	medium	static/js/background.js (line 2)	The extension exposes an external message API that allows five other extensions (by hardcoded Chrome extension IDs) to retrieve the user's SSID tracking identifier, read full local settings, remove email accounts, and…	5.5.0

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URLs

IPv4

IPv6

URLs

View the external URLs this extension communicates with to understand its network activity and data interactions.

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napoveda.seznam.cz	/cz/doplnky/	https://napoveda.seznam.cz/cz/doplnky/
www.seznam.cz	/doplnky/licence/	https://www.seznam.cz/doplnky/licence/
napoveda.seznam.cz	/cz/opravneni-aplikace/	https://napoveda.seznam.cz/cz/opravneni-aplikace/
o.seznam.cz	/ochrana-udaju/seznam-doplnky/	https://o.seznam.cz/ochrana-udaju/seznam-doplnky/
napoveda.seznam.cz	/cz/doplnky//	https://napoveda.seznam.cz/cz/doplnky/\
www.seznam.cz	/doplnky/licence//	https://www.seznam.cz/doplnky/licence/\
napoveda.seznam.cz	/cz/opravneni-aplikace//	https://napoveda.seznam.cz/cz/opravneni-aplikace/\
o.seznam.cz	/ochrana-udaju/seznam-doplnky//	https://o.seznam.cz/ochrana-udaju/seznam-doplnky/\
h.seznam.cz	/hit	https://h.seznam.cz/hit
reactjs.org	/docs/error-decoder.html	https://reactjs.org/docs/error-decoder.html?invariant=

Showing 1 to 10 of 90 rows

Rows per page:

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28.15.69.227	IPv4	-
149.45.27.16	IPv4	-
11.115.218.1	IPv4	-
125.174.234.26	IPv4	-
1.142.158.214	IPv4	-
176.242.45.227	IPv4	-
115.146.249.189	IPv4	-
2.145.3.107	IPv4	-
58.185.83.248	IPv4	-
188.27.142.58	IPv4	-

2.3 out of 5 · 10 most recent reviews

Text reviews

Positive

Negative

We are looking for a partnership to explore new sources of income for chrome extensions. We believe that this partnership can help your business grow stronger. See more at: https://extensionbuysell.com Looking forward to working with you! Best regards,

Madison Francis·20 Sept 2024

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Abner Wirtz·8 Jun 2024

Version History

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Code Diff

Compare extension code between any two versions.

0 changed files detected

No comparable text files found between these versions.

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Browse and explore files within this extension package

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Security Alert: Confirmed Malware

Seznam Doplněk – Esko

Supported Languages

Extension Info & Metadata

Publisher Contextual Analysis

Chrome Web Store Metadata

About this extension

Analytics & Metrics

User Growth

Rating Count

Average Rating

Static Code Security Analysis

Extracted Data

Code Review Findings Summary Across 9 Versions12

Versions scanned

Files with findings

Extracted Indicators (URLs and IPs)

URLs

Contextual Analysis

User Reviews

Version History

Version-to-Version Code Diff

Code Diff

Extension Files

User Reviews

User Growth

Rating Count

Average Rating