ALS_MEDRE.SM
Worm:ALisp/Blemfox.A (Microsoft), ALS.Bursted.B (Symantec), HEUR:Email-Worm.Acad.Medre.c (Kaspersky), Email-Worm.Acad (Ikarus), ACAD/Medre.A (ESET), Trojan.Acad.Bursted.W (Bitdefender)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
Threat Type: Worm
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This worm arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It may arrive bundled with malware packages as a malware component. It 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
Varies
LSP
Yes
25 Jun 2012
Arrival Details
This worm arrives as an attachment to email messages spammed by other malware/grayware or malicious users.
It may arrive bundled with malware packages as a malware component.
It 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 worm drops the following copies of itself into the affected system:
- %System%\acad.fas
- %Windows%\acad.fas
- {current working directory of drawing file}\cad.fas
- {current working directory of drawing file}\acad.fas
- {AutoCad support path}\cad.fas
- {AutoCad support path}\acad.fas
- %System%\{random characters}\acad.fas
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.. %Windows% is the Windows folder, which is usually C:\Windows.)
Other System Modifications
This worm adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\Windows Error Reporting
FILE = "{drawing file path and name}"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\Windows Error Reporting
FILE-G = "{random}"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\Windows Error Reporting
Time = "{date and time}"
NOTES:
It searches for the following file:
- {AutoCad Installion Folder}\Support\acad20{last 2 digir of year}.lsp
If found, it writes (if (findfile “cad.fas”)(load “cad.fas”)) to the said file. This results to the execution of its dropped copy once a drawing file is opened.
It uses the following SMTP servers to send information via email:
- smtp.{BLOCKED}q.com
- smtp.{BLOCKED}3.com
The affected AutoCad versions are 2000, 2002, and 2004 up to 2015.
SOLUTION
9.300
9.217.00
25 Jun 2012
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
Scan your computer with your Trend Micro product and note files detected as ALS_MEDRE.SM
Step 3
Restart in Safe Mode
Step 4
Delete this registry value
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\Windows Error Reporting
- FILE = "{drawing file path and name}"
- FILE = "{drawing file path and name}"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\Windows Error Reporting
- FILE-G = "{random}"
- FILE-G = "{random}"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\Windows Error Reporting
- Time = "{date and time}"
- Time = "{date and time}"
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as ALS_MEDRE.SM. 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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