Analysis by: Alvin John Nieto
ALIASES:

W32/CoinMiner.KA!tr (Fortinet), Trojan:Win32/Wiszr.B (Microsoft), Win32/CoinMiner.KA trojan (ESET), TR/Wiszr.B.63 (Avira)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet

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

File Size: 558,080 bytes
File Type: DLL
Memory Resident: Yes
Initial Samples Received Date: 18 Apr 2014
Payload: Connects to URLs/IPs

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:

  • %User Temp%\iswizard05\dwm.exe - detected as HKTL_COINMINE

(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, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

Other Details

This Trojan drops the following file(s)/component(s):

  • %User Temp%\iswizard05\libwinpthread-1.dll
  • %User Temp%\iswizard05\iswizard.7z - contains dwm.exe and libwinpthread-1.dll

(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, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

NOTES:

This Trojan connects to the URL {BLOCKED}.{BLOCKED}.128.129:1337 to receive additional blocks for mining Primecoins.

  SOLUTION

Minimum Scan Engine: 9.700
FIRST VSAPI PATTERN FILE: 10.734.03
FIRST VSAPI PATTERN DATE: 18 Apr 2014

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

Restart in Safe Mode

[ Learn More ]

Step 3

Search and delete this file

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %User Temp%\iswizard05\dwm.exe
  • %User Temp%\iswizard05\libwinpthread-1.dll
  • %User Temp%\iswizard05\iswizard.7z

Step 4

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_COINDROP.BS. 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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