Modified by: RonJay Kristoffer Caragay
ALIASES:

Worm:Win32/Dorkbot.I (Microsoft); RDN/Sdbot.worm!ca (McAfee); W32.IRCBot.NG (Symantec); Worm.Win32.Ngrbot.aeat (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt)

 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:

  • 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.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size: 232,448 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 20 May 2014

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 Temp%\c731200
  • %Application Data%\c731200
  • %User Temp%\Adobe\Reader_sl.exe
  • %Application Data%\Identities\{random filename}.exe

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

Autostart Technique

This worm adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Adobe System Incorporated = "%User Temp%\Adobe\Reader_sl.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{random filename} = %Application Data%\Identities\{random filename}.exe"

Propagation

This worm drops the following copy(ies) of itself in all removable drives:

  • {removable drive letter}:\{random characters}.exe

Download Routine

This worm saves the files it downloads using the following names:

  • %Application Data%\{random characters}.exe

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

Other Details

This worm connects to the following possibly malicious URL:

  • {BLOCKED}.{BLOCKED}eyyy2.com
  • {BLOCKED}.{BLOCKED}eyyy3.com
  • {BLOCKED}.{BLOCKED}eyyy4.com
  • {BLOCKED}.{BLOCKED}0.com
  • {BLOCKED}.{BLOCKED}000.com
  • {BLOCKED}.{BLOCKED}1egalaxyblack42.com
  • {BLOCKED}.{BLOCKED}2egalaxyblack42.com
  • {BLOCKED}.{BLOCKED}3egalaxyblack42.com
  • {BLOCKED}.{BLOCKED}4egalaxyblack42.com
  • {BLOCKED}.{BLOCKED}5egalaxyblack42.com
  • {BLOCKED}.{BLOCKED}s1fkxx42.com
  • {BLOCKED}.{BLOCKED}s2fkxx42.com
  • {BLOCKED}.{BLOCKED}s3fkxx42.com
  • {BLOCKED}.{BLOCKED}s4fkxx42.com
  • {BLOCKED}.{BLOCKED}s5fkxx42.com
  • {BLOCKED}.{BLOCKED}1understandme42.com
  • {BLOCKED}.{BLOCKED}2understandme42.com
  • {BLOCKED}.{BLOCKED}2understandme42.com
  • {BLOCKED}.{BLOCKED}1understandme42.com
  • {BLOCKED}.{BLOCKED}2understandme42.com
  • {BLOCKED}.{BLOCKED}epadsafa42.com
  • {BLOCKED}.{BLOCKED}epadsafa42.com
  • {BLOCKED}.{BLOCKED}epadsafa42.com
  • {BLOCKED}.{BLOCKED}epadsafa42.com
  • {BLOCKED}.{BLOCKED}epadsafa42.com
  • {BLOCKED}.{BLOCKED}a1lagroup42.com
  • {BLOCKED}.{BLOCKED}a2lagroup42.com
  • {BLOCKED}.{BLOCKED}a3lagroup42.com
  • {BLOCKED}.{BLOCKED}a4lagroup42.com
  • {BLOCKED}.{BLOCKED}a5lagroup42.com
  • {BLOCKED}.{BLOCKED}obohayawen42.com
  • {BLOCKED}.{BLOCKED}obohayawen42.com
  • {BLOCKED}.{BLOCKED}obohayawen42.com
  • {BLOCKED}.{BLOCKED}obohayawen42.com
  • {BLOCKED}.{BLOCKED}obohayawen42.com
  • {BLOCKED}.{BLOCKED}w1ladies42.com
  • {BLOCKED}.{BLOCKED}w2ladies42.com
  • {BLOCKED}.{BLOCKED}w3ladies42.com
  • {BLOCKED}.{BLOCKED}w4ladies42.com
  • {BLOCKED}.{BLOCKED}w5ladies42.com
  • {BLOCKED}.{BLOCKED}1hasn1aser42.com
  • {BLOCKED}.{BLOCKED}2hasn1aser42.com
  • {BLOCKED}.{BLOCKED}3hasn1aser42.com
  • {BLOCKED}.{BLOCKED}4hasn1aser42.com
  • {BLOCKED}.{BLOCKED}5hasn1aser42.com
  • {BLOCKED}.{BLOCKED}ll1gonowhaha42.com
  • {BLOCKED}.{BLOCKED}ll2gonowhaha42.com
  • {BLOCKED}.{BLOCKED}ll3gonowhaha42.com
  • {BLOCKED}.{BLOCKED}ll4gonowhaha42.com
  • {BLOCKED}.{BLOCKED}ll5gonowhaha42.com

It deletes itself after execution.

NOTES:
It creates shortcut files (.LNK) that use the names of the folders/files located on the removable drives for their file names. It then sets the attributes of the original folders/files to Hidden and System to trick the user into clicking the .LNK files.

  SOLUTION

Minimum Scan Engine: 9.700
FIRST VSAPI PATTERN FILE: 10.804.05
FIRST VSAPI PATTERN DATE: 19 May 2014
VSAPI OPR PATTERN File: 10.805.00
VSAPI OPR PATTERN Date: 19 May 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

Delete this registry value

[ Learn More ]

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\CurrentVersion\Run
    • Adobe System Incorporated = "%User Temp%\Adobe\Reader_sl.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • {random filename} = %Application Data%\Identities\{random filename}.exe"

Step 4

  1. Open a command prompt.
    • For Windows 2000, Windows XP, and Windows Server 2003 users, click Start>Run. In the Search box, type CMD then press Enter.
    • For Windows Vista and Windows 7 users, click Start, type CMD in the Search input field then press Enter.
  2. In the CMD console, type the following:

    ATTRIB [+R | -R] [+A | -A ] [+S | -S] [+H | -H] [+I | -I] [drive:][path][file name] [/S [/D] [/L]]

    Where:
    + Sets an attribute.
    - Clears an attribute
    R Read-only file attribute
    A Archive file attribute
    S System file attribute
    H Hidden file attribute
    I Not content indexed file attribute
    [drive:][path][filename]
    Specifies a file or files for attrib to process
    /S Processes matching files in the current folder and all subfolders.
    /D Processes folders
    /L Work on the attributes of the Symbolic Link versus the target of the Symbolic Link
    Example:
    To unhide all files and folders (including subfolders) in drive D:
    ATTRIB –H D:\* /S /D
  3. Repeat Step 3 for folders and files in other drives or directories.

Step 5

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