Trojan.Win32.DROPPER.D
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
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 Temp%\{5 Random Digits}\Facilitate.pif
- %User Temp%\{5 Random Digits}\I → deleted afterwards
- %User Temp%\Adopt
- %User Temp%\CAB{5 Random Digits}.TMP → deleted afterwards
- %User Temp%\Currently
- %User Temp%\Dumb.aiff
- %User Temp%\Dump
- %User Temp%\Ecological.aiff
- %User Temp%\Elephant
- %User Temp%\Eyed
- %User Temp%\Follows.aiff
- %User Temp%\Imperial
- %User Temp%\Meets
- %User Temp%\nss{4 Random Alphanumeric Characters}.tmp\ns{4 Random Alphanumeric Characters}.tmp → deleted afterwards
- %User Temp%\nss{4 Random Alphanumeric Characters}.tmp\nsExec.dll → deleted afterwards
- %User Temp%\Olympics.aiff
- %User Temp%\Po
- %User Temp%\Speeds.aiff
- %User Temp%\Suitable
- %User Temp%\Synthesis
- %User Temp%\Zoning
- %Windows%\BasicsOoo
- %Windows%\LaDomestic
(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).. %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)
It adds the following processes:
- "%User Temp%\nss{4 Random Alphanumeric Characters}.tmp\ns{4 Random Alphanumeric Characters}.tmp" cmd.exe /c cmd < Ecological.aiff
- cmd.exe /c cmd < Ecological.aiff
- cmd
- tasklist
- findstr "SophosHealth nsWscSvc ekrn bdservicehost AvastUI AVGUI & if not errorlevel 1 Set VDEYcsmF=AutoIt3.exe & Set nlSERwySYGsktvRmRdXGhXCezMfkpT=.a3x & Set iQQHRzvJUiFDJmatmxUgqNt=300
- extrac32 /Y Dumb.aiff *.*
- findstr /V "Lived" Zoning
- Facilitate.pif I
- waitfor /T 5 iQQHRzvJUiFDJmatmxUgqNt
(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%\{5 Random Digits}
- %User Temp%\nss{4 Random Alphanumeric Characters}.tmp → deleted afterwards
(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).)
SOLUTION
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 files
- %User Temp%\{5 Random Digits}\Facilitate.pif
- %User Temp%\{5 Random Digits}\I
- %User Temp%\Adopt
- %User Temp%\CAB{5 Random Digits}.TMP
- %User Temp%\Currently
- %User Temp%\Dumb.aiff
- %User Temp%\Dump
- %User Temp%\Ecological.aiff
- %User Temp%\Elephant
- %User Temp%\Eyed
- %User Temp%\Follows.aiff
- %User Temp%\Imperial
- %User Temp%\Meets
- %User Temp%\nss{4 Random Alphanumeric Characters}.tmp\ns{4 Random Alphanumeric Characters}.tmp
- %User Temp%\nss{4 Random Alphanumeric Characters}.tmp\nsExec.dll
- %User Temp%\Olympics.aiff
- %User Temp%\Po
- %User Temp%\Speeds.aiff
- %User Temp%\Suitable
- %User Temp%\Synthesis
- %User Temp%\Zoning
- %Windows%\BasicsOoo
- %Windows%\LaDomestic
Step 4
Search and delete these folders
- %User Temp%\{5 Random Digits}
- %User Temp%\nss{4 Random Alphanumeric Characters}.tmp
Step 5
Scan your computer with your Trend Micro product to delete files detected as Trojan.Win32.DROPPER.D. 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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