Trojan.LNK.GOSUKY.AA
Trojan.Multi.GenAutorunLnkFile.a (KASPERSKY)
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted:
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.
It executes then deletes itself afterward.
It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.
TECHNICAL DETAILS
2,282,809 bytes
LNK
No
19 Mar 2024
Connects to URLs/IPs, Drops files, Deletes 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 drops and executes the following files:
- {Malware File Path}\{Malware File Name}.pdf
It adds the following processes:
- "%Program Files%\Adobe\Reader 9.0\Reader\AcroRd32.exe" "{Malware File Path}\{Malware File Name}.pdf"
- powershell -windowstyle hidden -nop -NoProfile -NonInteractive -c "{malicious powershell command}"
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000(32-bit), Server 2003(32-bit), XP, Vista(64-bit), 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit) , or C:\Program Files (x86) in Windows XP(64-bit), Vista(64-bit), 7(64-bit), 8(64-bit), 8.1(64-bit), 2008(64-bit), 2012(64-bit) and 10(64-bit).)
It executes then deletes itself afterward.
Download Routine
This Trojan connects to the following website(s) to download and execute a malicious file:
- https://{BLOCKED}ropboxapi.com/2/files/download/step2/ps.bin
However, as of this writing, the said sites are inaccesible.
It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.
Other Details
This Trojan does the following:
- It makes a POST request to the token endpoint “https://{BLOCKED}pboxapi.com/oauth2/token ”.
- If the request is successful, the response will contain a new access token → used to authenticate subsequent API requests to Dropbox (downloading a file).
SOLUTION
9.800
19.230.05
21 Mar 2024
19.231.00
22 Mar 2024
Step 1
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 2
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 3
Search and delete this file
- {Malware File Path}\{Malware File Name}.pdf
Step 4
Scan your computer with your Trend Micro product to delete files detected as Trojan.LNK.GOSUKY.AA. 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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