INF_PALEVO.AO

 Analysis by: Pearl Charlaine Espejo

 ALIASES:

Worm/AutoRun.OF (AVG); INF/Autorun (ESET-NOD32); Worm:Win32/Rimecud!inf (Microsoft); Trojan.AutorunINF.Gen (BitDefender)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan may be dropped by other malware.

It automatically executes files when a user opens a drive.

  TECHNICAL DETAILS

File Size:

422 bytes

File Type:

INF

Memory Resident:

No

Initial Samples Received Date:

22 Dec 2016

Arrival Details

This Trojan may be dropped by the following malware:

  • variants of WORM_PALEVO

Propagation

The said .INF file contains the following strings:

[autorun
;{garbage}
open=.\Docs\print.exe
;{garbage}
:cmp
;{garbage}
icon=%SystemRoot%\system32\SHELL32.dll,4
:jmp3
;{garbage}
action=Open folder to view files using Windows Explorer
;{garbage}
shell\\\\open\\command=Docs////print.exe
:jne1
;{garbage}
shell\\explore\\\\command=.\\Docs/print.exe
;{garbage}
;;;;;;;;;;;;;
useautoplay=1
;{garbage}
;{garbage}
[autorun]
:goto fuckavg

Other Details

This Trojan automatically executes the following files when a user opens a drive:

  • {drive letter}:\Docs\print.exe

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

13.110.04

FIRST VSAPI PATTERN DATE:

22 Dec 2016

VSAPI OPR PATTERN File:

13.111.00

VSAPI OPR PATTERN Date:

23 Dec 2016

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

Identify and terminate files detected as INF_PALEVO.AO

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 3

Search and delete AUTORUN.INF files created by INF_PALEVO.AO that contain these strings

[ Learn More ]

[autorun
;{garbage}
open=.\Docs\print.exe
;{garbage}
:cmp
;{garbage}
icon=%SystemRoot%\system32\SHELL32.dll,4
:jmp3
;{garbage}
action=Open folder to view files using Windows Explorer
;{garbage}
shell\\\\open\\command=Docs////print.exe
:jne1
;{garbage}
shell\\explore\\\\command=.\\Docs/print.exe
;{garbage}
;;;;;;;;;;;;;
useautoplay=1
;{garbage}
;{garbage}
[autorun]
:goto fuckavg

Step 4

Scan your computer with your Trend Micro product to delete files detected as INF_PALEVO.AO. 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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