PUA.Win32.InstallCore.MANHOCFL
a variant of Win32/OfferCore.E potentially unwanted application
Windows
Threat Type: Potentially Unwanted Application
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware
This Potentially Unwanted Application 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.
As of this writing, the said sites are inaccessible.
It does not have any information-stealing capability.
TECHNICAL DETAILS
1,771,216 bytes
EXE
No
01 Aug 2024
Connects to URLs/IPs, Drops files
Arrival Details
This Potentially Unwanted Application 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 Potentially Unwanted Application drops the following files:
- %User Temp%\is-{Random}.tmp\is-{Random}.tmp
- %User Temp%\is-{Random}.tmp\v.png → deleted afterwards
- %User Temp%\is-{Random}.tmp\x.png → deleted afterwards
- %User Temp%\is-{Random}.tmp\{Grayware File Name}.tmp
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
It adds the following processes:
- "%User Temp%\is-{Random}.tmp\{Grayware File Name}.tmp" /SL5="${Random},{Random},{Random},{Grayware File Path\Grayware File Name}.exe"
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
It creates the following folders:
- %User Temp%\is-{Random}.tmp\
- %User Temp%\is-{Random}.tmp\_isetup
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
Propagation
This Potentially Unwanted Application does not have any propagation routine.
Backdoor Routine
This Potentially Unwanted Application does not have any backdoor routine.
Rootkit Capabilities
This Potentially Unwanted Application does not have rootkit capabilities.
Download Routine
This Potentially Unwanted Application connects to the following URL(s) to download its component file(s):
- https://{BLOCKED}oftonic.com/{Random}/{Random}/{Random}/{Software Name To Download}.exe?Expires={Random}&Signature={Signature}&url=https://{Software Name to Download}.en.softonic.com&Filename={File Name To Download}.exe
As of this writing, the said sites are inaccessible.
Information Theft
This Potentially Unwanted Application does not have any information-stealing capability.
Other Details
This Potentially Unwanted Application does the following:
- It is capable of downloading a certain software depending on its file name.
- It is capable of downloading and installing Avast Antivirus Software depending if the user accepts the offer to install the software.
- It adds processes, creates registry keys and entries, creates files and folders, and connects to URLs related to Avast Antivirus Software when the user accepts to install the software.
- It displays the following GUI during installation:
- It connects to the following URLs for images displayed in its GUI:
- https://{BLOCKED}0phbn9qb.cloudfront.net/f/AVAST/images/DOTPS-1511/547X280/EN.png
It does not exploit any vulnerability.
SOLUTION
9.800
2.753.00
15 Aug 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 these folders
- %User Temp%\is-{Random}.tmp\_isetup
- %User Temp%\is-{Random}.tmp
Step 4
Search and delete these files
- %User Temp%\is-{Random}.tmp\is-{Random}.tmp
- %User Temp%\is-{Random}.tmp\v.png
- %User Temp%\is-{Random}.tmp\x.png
- %User Temp%\is-{Random}.tmp\{Grayware File Name}.tmp
Step 5
Scan your computer with your Trend Micro product to delete files detected as PUA.Win32.InstallCore.MANHOCFL. 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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