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VBS_MAILFIND.A

June 17, 2014
 Analysis by: Al Victor de Leon
 ALIASES:

Trojan-Mailfinder.VBS.GetPepe.a (Kaspersky)

 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: Worm

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW


This worm arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It gathers target email addresses from cached email, address books, and mailboxes. The sent messages contains a link where a copy of the malware may be downloaded.

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system. It saves downloaded files into the said created folder. As of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

269,728 bytes

File Type:

VBS

Memory Resident:

No

Initial Samples Received Date:

15 Jun 2014

Arrival Details

This worm arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

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 creates the following folders:

  • C:\temp

Propagation

This worm uses the MAPI to send email messages that contain links to sites hosting remote copies of itself with the following details:

  • Sender: {BLOCKED}te.{BLOCKED}bon3374@yahoo.de

It uses any of the following Simple Mail Transfer Protocol (SMTP) servers:

  • SMTP Server: "mailgate.otenet.gr"
  • SMTP Server Port: 587
  • User Name: "nastia26@otenet.gr"
  • Password: "nat1978#"

It gathers target email addresses from cached email, address books, and mailboxes.

The sent messages contain the following link(s), where a copy of the malware may be downloaded:

  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/uw92ooko73yincw/Documents.zip?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/j7eiyij7wshwhoe/Documents.zip?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/x2npx95tzmk724r/Documents.zip?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/i0orsrnizec9fr0/Documents.zip?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/liwvrveoh67qbnw/Documents.zip?dl=1 - Not accessible

It sends out the following messages:

Here re the required documents you asked for.
{malware download link} hyper link as Documents.zip
Keep me posted for any complaints or anything.
Thank you.

Download Routine

This worm downloads an updated copy of itself from the following website(s):

  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/uw92ooko73yincw/Documents.zip?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/j7eiyij7wshwhoe/Documents.zip?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/x2npx95tzmk724r/Documents.zip?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/i0orsrnizec9fr0/Documents.zip?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/liwvrveoh67qbnw/Documents.zip?dl=1 - Not accessible

It connects to the following website(s) to download and execute a malicious file:

  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/o0d1ce9toe9a9rq/clickyes.dat?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/f2h777xsqv8cepb/clickyes.dat?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/ui6zo977ttx7bqy/clickyes.dat?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/tsv6l172jqlt0tf/clickyes.dat?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/d9bt6hyvhjjwwkd/clickyes.dat?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/o0d1ce9toe9a9rq/clickyes.dat?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/f2h777xsqv8cepb/clickyes.dat?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/ui6zo977ttx7bqy/clickyes.dat?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/tsv6l172jqlt0tf/clickyes.dat?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/d9bt6hyvhjjwwkd/clickyes.dat?dl=1 - Not accessible

It connects to the following URL(s) to download its component file(s):

  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/rxkbtjtpvzgrra4/xml.zip?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/8w0ldbbf0ndb78l/xml.zip?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/ubdlqx6leqy3gw8/xml.zip?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/h6znwxvjs3rpvw7/xml.zip?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/eclb44x6t01lxsg/xml.zip?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/ywfb7lux4of25au/xml.zip?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/6xm9cw2dkmo0q0k/xml.zip?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/xoqbc490nurxeow/xml.zip?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/ja2hb47rwkzqqo8/xml.zip?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/y8lpltcjxuf81n7/xml.zip?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/8zaselhbwkdw3w7/xml.zip?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/xfyakmoo7gzv4j3/xml.zip?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/bxlxjku6u6i5mqq/xml.zip?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/gs3eq8r00yn4of8/xml.zip?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/6e7xw9qrovheepd/xml.zip?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/073he87wsizsn14/xml.zip?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/z4jl4ckge68ly86/xml.zip?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/2v5auf9b4wh1sas/xml.zip?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/clw9swn6w7ez8yz/xml.zip?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/yc4ju3wap4y71va/xml.zip?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/l93ij60w4jsgj6e/xml.zip?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/ll2ydaxt1qesxbg/xml.zip?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/h5fy4kinzcqpo0e/xml.zip?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/1dxzjip2h8ep2fl/xml.zip?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/98yoxgz9nh00lxp/xml.zip?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/r7ll4mze3xigpkb/xml.zip?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/da9mznunn0kz588/xml.zip?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/36gldtb1ngjhjg1/xml.zip?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/h3bt7tygbf91jsm/xml.zip?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/m26w3f17a8zc3tr/xml.zip?dl=1 - Not accessible
  • http://{BLOCKED}.{BLOCKED}xusercontent.com/s/vntfj2zc6nygvv2/xml.zip?dl=1 - Not accessible

It saves the files it downloads using the following names:

  • C:\temp\{random}.{random} - Component file
  • C:\temp\clickyes.exe - Malicious file

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

It saves downloaded files into the said created folder.

As of this writing, the said sites are inaccessible.

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

10.864.03

FIRST VSAPI PATTERN DATE:

15 Jun 2014

VSAPI OPR PATTERN File:

10.865.00

VSAPI OPR PATTERN Date:

15 Jun 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 these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.  
  • C:\temp\

Step 4

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

Step 5

Scan your computer with your Trend Micro product to delete files detected as VBS_MAILFIND.A. 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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