Trojan.Win64.DOWNLOADER.O
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It does not have any propagation routine.
It does not have any backdoor routine.
It retrieves specific information from the affected system.
TECHNICAL DETAILS
Arrival Details
This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Installation
This Trojan adds the following mutexes to ensure that only one of its copies runs at any one time:
- c88b0910ed61c17a780135d615c43ef6917616749
Propagation
This Trojan does not have any propagation routine.
Backdoor Routine
This Trojan does not have any backdoor routine.
Rootkit Capabilities
This Trojan does not have rootkit capabilities.
Information Theft
This Trojan retrieves the following information from the affected system:
- Hostname
- Locale Info
Other Details
This Trojan connects to the following URL(s) to check for an Internet connection:
- https://www.bing.com
It does the following:
- It impersonates the logged on user.
- It uses the following URL to use Slack's API for its malicious purposes:
- https://{BLOCKED}k.com/api/conversations.list?exclude_archived=true → lists all the conversations(channels, direct messages, and group chats) available in the Slack workspace
- https://{BLOCKED}k.com/api/files.upload?&channels={channel ID} → uploads a file to one or more channels, direct messages in the Slack workspace
- https://{BLOCKED}k.com/api/conversations.create → creates a new channel (public or private) in the Slack workspace
- https://{BLOCKED}k.com/api/conversations.update → updates the settings of an existing Slack channel
- https://{BLOCKED}k.com/api/conversations.delete → delete a Slack channel (public or private)
- https://{BLOCKED}k.com/api/conversations.postMessage → sends a message to a specific conversation in Slack workspace
- https://{BLOCKED}k.com/api/conversations.history?limit=200&channel={channel ID} → retrieves the past 200 messages from a specified Slack channel (public or private)
- It retrieves its encrypted component to communicate with Slack workspace using the following URL:
- https://{BLOCKED}ell.io/notes/58434-3
- https://{BLOCKED}l.xlog.app/page1
- The Slack communication was established through the use of this hardcoded authentication token:
- {BLOCKED}19976938784-7094277537125-7090647648246-e3a9e4feeb2fe448f889890be6e1299e → Inaccessible; Token revoked
It does not exploit any vulnerability.
SOLUTION
Step 1
Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:
-
TSPY.Win32.TRX.XXPE50FFF085
Step 2
Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.
Step 3
Scan your computer with your Trend Micro product to delete files detected as Trojan.Win64.DOWNLOADER.O. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check the following Trend Micro Support pages for more information:
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