Trojan.VBS.MISPADU.THIADBO
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware
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.
TECHNICAL DETAILS
9,077 bytes
VBS
No
14 Sep 2020
Connects to URLs/IPs, Downloads files, Collects system information, Executes files
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 creates the following folders:
- C:\{string2 from the decrypted response from url}
Other Details
This Trojan does the following:
- It terminates itself when executed in a virtual environment whose computer name is "JOHN-PC" by checking for the following values:
- OS Model Name
- Virtual Machine - for Hyper V
- VMware Virtual Platform - for VMware
- VirtualBox - for Virtualbox
- BIOS Version
- Hyper-V 2008(Beta,RC0,RTM and R2)
- VS2005/VS2005R2/VS2005R2SP1
- VPC2004/VPC2007
- Windows Virtual PC
- Also terminates itself if the default installed OS language is not in the following list:
- Spanish – Spain (traditional)
- Portugese – Brazil
- Spanish – Mexico
- Spanish – Spain
- Spanish Microsoft Office Language – (Microsoft Office Language Value – LANGUAGE_SPANISH)
- Connects to the following url to download and execute malicious vbscript code in memory to check system and download more files:
- http://{BLOCKED}.{BLOCKED}7.173/gt21.php
- If C:\Users\Public\{string1 from the decrypted response from url}4.zip does not exist
- Connects and decrypts data from http://{BLOCKED}.{BLOCKED}7.173/k1oa.php
- Connects and downloads file from http://{BLOCKED}.{BLOCKED}7.173/m/k1o{string3 from decrypted data from url}.gt2
- C:\Users\Public\{string1 from the decrypted response from url}4.zip
- If C:\Users\Public\{string1 from the decrypted response from url}1.zip does not exist
- Connects and downloads file from http://{BLOCKED}.{BLOCKED}7.173/k1oa{string1 from the decrypted response from url}.gt2
- Connects and downloads file from http://{BLOCKED}.{BLOCKED}7.173/k1oasq.gt2
- Connects and downloads file from http://{BLOCKED}.{BLOCKED}7.173/k1oasl.gt2
- Connects and downloads file from http://{BLOCKED}.{BLOCKED}7.173/k1oass.gt2
- Connects and downloads file from http://{BLOCKED}.{BLOCKED}7.173/k1oaai.gt2
- C:\Users\Public\{string1 from the decrypted response from url}sq.zip
- C:\Users\Public\{string1 from the decrypted response from url}sl.zip
- C:\Users\Public\{string1 from the decrypted response from url}ss.zip
- C:\Users\Public\{string1 from the decrypted response from url}ai.zip
- {string1 from the decrypted response from url} - detected as Trojan.AutoIt.MISPADO.THIADBO
- {string1 from the decrypted response from url}1.{reversed last 3 characters of string1} - detected as Trojan.Win32.MISPADO.THENC
- {string1 from the decrypted response from url}ai.exe - non-malicious AutoIt loader
- libeay32.dll – non-malicious libraries
- ssleay32.dll – non-malicious libraries
- winx86.dll – non-malicious libraries then deletes all the downloaded zip files
- C:\Users\Public\{second character of computer name}_
- strings from decrypted response from url
- created folder path
- hard-coded values from the script
- current date
- C:\Users\Public\{second character of computer name}
- {string1 from the decrypted response from url}ai.exe {string1 from the decrypted response from url} @1
- {string1 from the decrypted response from url}ai.exe {string1 from the decrypted response from url} ##1
- {string1 from the decrypted response from url}ai.exe {string1 from the decrypted response from url} ##3
SOLUTION
9.850
16.226.06
14 Sep 2020
16.227.00
15 Sep 2020
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:
- Downloader.VBS.TRX.XXVBS82EFF006
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
Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.
Step 4
Search and delete these files
- C:\Users\Public\{decrypted string1 from url response}sq.zip
- C:\Users\Public\{decrypted string1 from url response}sl.zip
- C:\Users\Public\{decrypted string1 from url response}ss.zip
- C:\Users\Public\{decrypted string1 from url response}ai.zip
- C:\{decrypted string2 from url response}\{decrypted string1 from url response}
- C:\{decrypted string2 from url response}\{decrypted string1 from url response}1.{reversed last 3 characters of string1}
- C:\{decrypted string2 from url response}\{string1 from the decrypted response from url}ai.exe
*Note: Read the following Microsoft page if these steps do not work on Windows 7 and Server 2008 (R2).
Step 5
Search and delete these folders
- C:\{decrypted string2 from url response}
- DATA_GENERIC
Step 6
Scan your computer with your Trend Micro product to delete files detected as Trojan.VBS.MISPADU.THIADBO. 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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