TROJ_MALEPS.B
W97M/HWPS.AGN (Avira); Trojan.HTML.Agent.mb (Kaspersky); TrojanDropper:Win32/Agent (Microsoft); Trojan.Mdropper (Symantec)
Windows
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Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
This malware is associated with attacks involving malicious attachments for Hangul Word Processor (HWP). In the attack, PostScript is used to gain access to a victim's machine.
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
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 the following files:
- %User Startup%\HncCheck.lnk -> taget location: C:\Windows\System32\rundll32.exe %temp%\..\HncBB80.bin,MainCallBack
- %AppDataLocal%\HncBB80.bin -> detected as TROJ_HWDOOR.A
It drops and executes the following files:
- %User Temp%\Hnc\BinData\EMB00000{7 random hex}.ps
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
It injects threads into the following normal process(es):
- explorer.exe
Other Details
This Trojan connects to the following URL(s) to check for an Internet connection:
- www.kbautosys.com
SOLUTION
Step 1
Before doing any scans, Windows XP, Windows Vista, and Windows 7 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 files
- %User Temp%\Hnc\BinData\EMB00000{7 random hex}.ps
- %User Startup%\HncCheck.lnk
- %AppDataLocal%\HncBB80.bin
Step 4
Scan your computer with your Trend Micro product to delete files detected as TROJ_MALEPS.B. 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 this Knowledge Base page for more information.
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