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WORM_SIRCAM.C

July 01, 2013
 ALIASES:

Worm:Win32/Sircam@mm (Microsoft); W32/SirCam@MM (McAfee); W32.Sircam.Worm@mm (Symantec); Email-Worm.Win32.Sircam.c (Kaspersky); BehavesLike.Win32.Malware.eah (mx-v) (Sunbelt); Worm/Generic.CKGK (AVG)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • 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.

  TECHNICAL DETAILS

File Size:

160,768 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

09 May 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 creates the following folders:

  • %User Temp%\Adobe

(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.)

Other System Modifications

This worm adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\SirCam

HKEY_CURRENT_USER\Software\Adobe\
Adobe Acrobat\10.0

HKEY_CURRENT_USER\Software\Adobe\
Adobe Synchronizer\10.0

HKEY_LOCAL_MACHINE\System\Acrobatbrokerserverdispatchercpp789

HKEY_CURRENT_USER\Software\Adobe\
Acrobat Reader\10.0\Installer\
Migrated

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\SirCam
FC0 = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\SirCam
FD1 = "{malware file name}"

HKEY_LOCAL_MACHINE\SOFTWARE\SirCam
FC1 = "1.88"

HKEY_LOCAL_MACHINE\SOFTWARE\SirCam
FD7 = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\SirCam
FB1B = "%System Root%\recycled\{malware file name}"

HKEY_LOCAL_MACHINE\SOFTWARE\SirCam
FB1BB = "Torbjorn_Anderberg@Hotmail.com"

HKEY_LOCAL_MACHINE\SOFTWARE\SirCam
FB1BA = "mail1.telia.com"

HKEY_LOCAL_MACHINE\SOFTWARE\SirCam
FD3 = "3"

Dropping Routine

This worm drops the following files:

  • %User Temp%\{malware file name}
  • %System Root%\recycled\SirC32.exe
  • %System Root%\recycled\{malware file name}

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

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.300

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

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\SOFTWARE
    • SirCam
  • In HKEY_CURRENT_USER\Software\Adobe\Adobe Acrobat
    • 10.0
  • In HKEY_CURRENT_USER\Software\Adobe\Adobe Synchronizer
    • 10.0
  • In HKEY_LOCAL_MACHINE\System
    • Acrobatbrokerserverdispatchercpp789
  • In HKEY_CURRENT_USER\Software\Adobe\Acrobat Reader\10.0\Installer
    • Migrated

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_LOCAL_MACHINE\SOFTWARE\SirCam
    • FC0 = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\SirCam
    • FD1 = "{malware file name}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\SirCam
    • FC1 = "1.88"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\SirCam
    • FD7 = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\SirCam
    • FB1B = "%System Root%\recycled\{malware file name}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\SirCam
    • FB1BB = "Torbjorn_Anderberg@Hotmail.com"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\SirCam
    • FB1BA = "mail1.telia.com"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\SirCam
    • FD3 = "3"

Step 4

Search and delete these components

[ Learn More ]
There may be some components 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.
  • %User Temp%\{malware file name}
  • %System Root%\recycled\SirC32.exe
  • %System Root%\recycled\{malware file name}

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.
  • %User Temp%\Adobe

Step 6

Scan your computer with your Trend Micro product to delete files detected as WORM_SIRCAM.C. 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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