Tiny.BM

Classification

Malware

Trojan-Downloader

W32

Tiny.BM, Tiny.BM

Summary

Tiny.BM, a variant of Tiny, is a Trojan. Tiny.BM downloads and runs a file from a malicious website.

Removal

Automatic action

Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.

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User Guide

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Submit a sample

Submit a file or URL for further analysis.

Technical Details

Once Tiny.BM has been executed it will decrypt strings such as the following, which are required for its malicious activities:

  • API names
  • URL
  • Filename

Note: decryption key is 0x56

Once decrypted, Tiny.BM will attempt to download from the following site:

  • https://69.50.190.164/traff/sb8[BLOCKED].exe

It will save the file in the following hard-coded path and filename:

  • %temp%\~dfte14.tmp

After downloading, it will check if the file size of the downloaded file is equal to 449,024 bytes. If it is the exact size, it will then execute the downloaded file. If the file size is different, it will repeatedly retry downloading until file size matches.

Note: as of this writing, the URL link above is no longer active.

Some samples of Tiny.BM have embedded malware that when extracted is detected as Trojan-Downloader.Win32.Small.cxx.

Date Created: -

Date Last Modified: -