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Threat Encyclopedia

PE_MUSTAN.A

ANALYSIS BY

Jed Valderama


ALIASES:

Virus:Win32/Morto.A (Microsoft), Worm.Win32.Fipp.a (Kaspersky), W32/Pift (Mcafee),Win32/Morto.A (ESET)

PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type:File infector

  • Destructiveness:No

  • Encrypted: Yes

  • In the wild: Yes

OVERVIEW

TECHNICAL DETAILS

SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.246.21

FIRST VSAPI PATTERN DATE:

10 Jul 2012

VSAPI OPR PATTERN File:

9.247.00

VSAPI OPR PATTERN Date:

11 Jul 2012

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Scan your computer with your Trend Micro product and note files detected as PE_MUSTAN.A

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Delete this registry key

[ 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_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
    • wmicucltsvc

Step 5

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_LOCAL_MACHINE\SYSTEM\Select
    • v = "{virus code}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\Select
    • p = "{login passwords}
  • In HKEY_LOCAL_MACHINE\SYSTEM\Select
    • pu = "{login usernames} - {login passwords}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\Select
    • ext = "{plugin code obtained from C&C}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\Select
    • plg = "{plugin code obtained from C&C}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\Select
    • rmt = "{date and time of execution}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\Select
    • {ip address of targeted victims} = {date and time of execution}
  • In HKEY_LOCAL_MACHINE\CurrentControlSet\Services
    • {Security Service} = "4"

Step 6

Restart in normal mode and scan your computer with your Trend Micro product for files detected as PE_MUSTAN.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 7

Restore these deleted registry keys/values from backup

*Note: Only Microsoft-related keys/values will be restored. If the malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.


  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\CurrentVersion\Run
    • {AntiVirus Application} = "{Path of AntiVirus Application}"


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