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WORM_PALEVO.BGC

October 08, 2012
 Analysis by: Christopher Daniel So
 ALIASES:

VirTool:Win32/VBInject.gen!CU (Microsoft); W32.Pilleuz (Symantec); P2P-Worm.Win32.Palevo.lrs, P2P-Worm.Win32.Palevo.lrs (Kaspersky); Backdoor.Sdbot.DGDK (FSecure); Troj/VBDrop-P (Sophos); Worm.Win32.Palevo.mwz (v) (GFI-Sunbelt); W32/Kolab.HQL!worm (Fortinet); W32/Worm.AXRV (exact) (FProt); Worm/Palevo.lrs.4 (AntiVir); W32/Worm.AXRV (Authentium); Worm.P2P.Palevo-12 (ClamAV); P2P-Worm.Win32.Palevo (Ikarus); Trojan W32/VBTroj.CEPA (Norman); I-Worm.Palevo.lrs (Quickheal); Trojan-Dropper.VB.Clare (VBA32)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW


This worm arrives via removable drives. 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 drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

PE

Memory Resident:

Yes

Initial Samples Received Date:

14 Apr 2010

Arrival Details

This worm arrives via removable drives.

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 Root%\RECYCLER\{random SID}\{random file name}.exe

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

It drops the following files:

  • %System Root%\RECYCLER\{random SID}\Desktop.ini - non-malicious files

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Taskman = "%System Root%\RECYCLER\{random SID}\{random file name}.exe"

Propagation

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

  • {drive letter}:\Docs\print.exe

It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.

The said .INF file contains the following strings:

[autorun
;OEP
open=.\Docs\print.exe
;??
:cmp
;tg
icon=%System Root%\system32\SHELL32.dll,4
:jmp3
;ü?g?ÝYwb??F?]L??CìF?mö?fò=?V÷ÍìTÿ
action=Open folder to view files using Windows Explorer
;?dë???a?s???éü?Y??;`äw??X???L
shell\\\\open\\command=Docs////print.exe
:jne1
;?oÍjBv?è?|??
shell\\explore\\\\command=.\\Docs/print.exe
;ñ=T???L?AÑ???ÈxÖ
;;;;;;;;;;;;;
useautoplay=1
;à`Q??
;(?s??
[autorun]
:goto fuckavg

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

Other Details

This worm does the following:

  • Drops the following files in all removable drives:
    • {drive letter}:\Docs\Desktop.ini

  SOLUTION

Minimum Scan Engine:

8.900

NOTES:

Trend customers:

    Keep your pattern and scan engine files updated. Trend Micro antivirus software can clean or remove most types of computer threats. Malware, though, such as Trojans, scripts, overwriting viruses and joke programs which are identified as uncleanable, should simply be deleted.

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  • Use HouseCall - the Trend Micro online threat scanner to check for malware that may already be on your PC.
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