PUA.Win32.OfferCore.AN
UDS:Downloader.Win32.Agentb.a (KASPERSKY); Win32/OfferCore.F (NOD32)
Windows
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Potentially Unwanted Application
Destructiveness: No
Encrypted:
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.
TECHNICAL DETAILS
1,734,816 bytes
EXE
No
31 May 2023
Drops files, Connects to URLs/IPs
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\{filename}.tmp
- %User Temp%\is-{Random}.tmp\is-{Random}.tmp
- %User Temp%\is-{Random}.tmp\file_.tmp
- %User Temp%\is-{Random}.tmp\botva2.dll
- %User Temp%\is-{Random}.tmp\Helper.dll
- %User Temp%\is-{Random}.tmp\file_.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 adds the following processes:
- "%User Temp%\is-{Random}.tmp\{filename}.tmp" /SL5="$240142,831488,831488,{Malware Filepath}\{filename}.exe"
- "%User Temp%\is-{Random}.tmp\file_.exe" /LANG=en /NA=Rh85hR64
- "%User Temp%\is-{Random}.tmp\file_.tmp" /SL5="$1100E4,1559708,780800,%User Temp%\is-{Random}.tmp\file_.exe" /LANG=en /NA=Rh85hR64
(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).)
Other Details
This Potentially Unwanted Application connects to the following possibly malicious URL:
- https://{BLOCKED}ifddppqn.cloudfront.net/installer/60426659/3747246517841079684
SOLUTION
9.800
2.627.00
01 Jun 2023
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
- %User Temp%\is-{Random}.tmp\{filename}.tmp
- %User Temp%\is-{Random}.tmp\is-{Random}.tmp
- %User Temp%\is-{Random}.tmp\file_.tmp
- %User Temp%\is-{Random}.tmp\botva2.dll
- %User Temp%\is-{Random}.tmp\Helper.dll
- %User Temp%\is-{Random}.tmp\file_.exe
Step 4
Search and delete these folders
- %User Temp%\is-{Random}.tmp
- %User Temp%\is-{Random}.tmp\_isetup
Step 5
Scan your computer with your Trend Micro product to delete files detected as PUA.Win32.OfferCore.AN. 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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