ALIASES:

BackDoor-ABF (McAfee); Trojan.Gen.2 (Symantec); Worm.Win32.VBNA.bdmc (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse Dropper.Generic2.AOUP (AVG)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This worm 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: 126,976 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 21 Jun 2013

Arrival Details

This worm 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:

  • %User Profile%\Wilbert1\winlogon.exe

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

It creates the following folders:

  • %User Profile%\Wilbert1

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

Other Details

This worm connects to the following possibly malicious URL:

  • http://y-5-e-2-7-w-0-0-s-r-f-7-g-5-7-9-j-1-n-n-z-s-p-1-m-5-v-v-d-4-e-.{BLOCKED}{BLOCKED}{BLOCKED}{BLOCKED}0-26-{BLOCKED}{BLOCKED}{BLOCKED}{BLOCKED}0.info/VERSION.TXT
  • http://5-1-g-u-g-l-4-7-2-7-9-a-z-2-1-5-4-3-g-7-2-7-0-j-u-3-n-8-p-e-e-.{BLOCKED}3-j-fi-1-il-h-il-3e-z-u-r-u-lk-h-wm-3-6-g-0o-s-dx.info/VERSION.TXT
  • http://i-7-4-6-j-2-5-l-5-8-9-z-5-8-9-4-h-s-g-3-4-z-o-6-7-b-z-l-8-v-o-.{BLOCKED}l8-k-7o-8z-l-v-uhb-u-td-8i-oe-0gp-e2g-we6-ws-2vpd.info/VERSION.TXT
  • http://l-h-9-0-4-4-g-3-o-2-w-2-q-5-2-0-d-5-9-4-p-7-s-m-d-i-0-1-8-v-9-.{BLOCKED}k-5g-z2-pu6-e5x-4h-yij-yx-duv-wpx-2r8-7vc-ox-4q-u.info/VERSION.TXT
  • http://h-w-4-9-5-7-e-3-4-x-3-b-b-7-r-b-j-3-q-5-8-w-7-7-v-0-4-0-2-6-1-.{BLOCKED}-fj-o4-it-ok-n-9j-zjg-pz9x-1z-zekv-y4f-acg-cq3v-j.info/VERSION.TXT
  • http://8-0-3-5-w-2-3-g-g-f-f-7-8-1-4-s-1-2-2-8-3-z-x-7-7-0-i-y-8-2-4-.{BLOCKED}na-5w-2z3-djmu-7pk-qy-0-bok-re9-ym-v9h-av-njx-2es.info/VERSION.TXT
  • http://6-n-h-4-z-0-c-5-8-l-3-3-e-7-4-8-u-m-5-2-p-x-j-a-g-7-r-b-n-3-m-.{BLOCKED}o-nw-dug-uqv-kzn-m-jtu-uf-q3i-r0o-vc-l4k-h21y-a9r.info/VERSION.TXT
  • http://n-q-6-3-1-f-c-w-8-3-p-s-e-6-z-v-3-o-j-c-h-o-6-8-b-9-0-3-3-0-7-.{BLOCKED}-y1a-zu-s-no-bq-q1p8-qjr-j1hr-nh8-22-af3q-7q-gu-7.info/VERSION.TXT
  • http://p-u-v-j-r-g-2-7-o-4-u-y-8-z-1-v-5-e-w-q-v-1-o-k-9-1-p-m-4-7-5-.{BLOCKED}bq-7-9g-haf-13-m8-4t2e-cl-fzd-6kq-g6q-ba-c-dvd4m3.info/VERSION.TXT
  • http://m-7-p-i-7-8-b-k-h-9-q-d-r-3-3-9-4-s-j-8-5-6-h-e-5-i-9-9-n-t-7-.{BLOCKED}-r6-ut0-jwl-9-th9-i4k-nt1s-sz4-mk4-ahr-hf8-yi-c-6.info/VERSION.TXT
  • http://4-c-1-4-w-s-3-1-e-j-0-3-r-w-q-g-8-8-9-9-a-3-7-m-o-b-f-p-5-f-5-.{BLOCKED}s-k-q0-e3r-6s-23-m2wf-7xy1z0-c0u-5wc-g0rb-2-1-5-l.info/VERSION.TXT
  • http://3-9-h-n-y-v-x-0-5-4-5-3-3-s-4-4-e-8-c-5-w-s-9-h-8-h-5-3-u-j-m-.{BLOCKED}o-5-8w-0yc-tzl8-h2a-7f-ezc-oxt1-7-8y-0elh-be-3k-d.info/VERSION.TXT
  • http://z-w-m-b-c-e-r-0-w-t-5-8-k-0-3-0-8-x-1-0-7-i-0-5-p-y-d-f-3-3-3-.{BLOCKED}sy-7i-5j3-sf7-8z5-54-n8v7r-0-ih7-36992m-o3-0q-g-3.info/VERSION.TXT
  • http://t-7-7-a-3-q-b-y-g-j-8-8-p-2-5-c-2-o-i-9-p-x-1-5-o-9-u-c-u-7-0-.{BLOCKED}-tr2p-7c-5lk-huxs-0wq-bma-0wvi-2y-a8s-elw-hv-o0-6.info/VERSION.TXT

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine: 9.300

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

Search and delete this folder

[ 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.
  • %User Profile%\Wilbert1

Step 3

Scan your computer with your Trend Micro product to delete files detected as WORM_VBNA.SMY. 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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