WORM_RIMECUD.ZC


 ALIASES:

Trojan:Win32/Rimecud.A (Microsoft), Worm.Win32.Palevo.b (v) (Sunbelt), Trojan-Spy.Win32.Egoldan (Ikarus), Trojan.Win32.Sasfis.byrw (Kaspersky)

 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 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:

88,576 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

26 Aug 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%\{malware filename}.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.)

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 = "%User Profile%\{malware filename}.exe"

Propagation

This worm creates the following folders in all removable drives:

  • {Removable Drive Letter}:\peace

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

  • {Removable Drive Letter}:\peace\showtime.exe

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

Dropping Routine

This worm drops the following files:

  • {Removable Drive Letter}:\autorun.inf

Other Details

This worm connects to the following possibly malicious URL:

  • {BLOCKED}d.{BLOCKED}udio.ru
  • {BLOCKED}a.{BLOCKED}nds.su
  • {BLOCKED}l.{BLOCKED}owerbord.com
  • {BLOCKED}e.{BLOCKED}usenumber.com
  • {BLOCKED}k.{BLOCKED}-protection.net.ru

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

10.242.02

FIRST VSAPI PATTERN DATE:

27 Aug 2013

VSAPI OPR PATTERN File:

10.243.00

VSAPI OPR PATTERN Date:

28 Aug 2013

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

Scan your computer with your Trend Micro product and note files detected as WORM_RIMECUD.ZC

Step 3

Identify and delete files detected as WORM_RIMECUD.ZC using either the Startup Disk or Recovery Console

[ Learn More ]

Step 4

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\Software\Microsoft\Windows NT\CurrentVersion\Winlogon
    • Taskman = "%User Profile%\{malware filename}.exe"

Step 5

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.
  • {Removable Drive Letter}:\peace

Step 6

Search and delete this file

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • {Removable Drive Letter}:\autorun.inf

Step 7

Scan your computer with your Trend Micro product to delete files detected as WORM_RIMECUD.ZC. 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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