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WORM_EMERLEOX.DP

October 12, 2012
 ALIASES:

Worm:Win32/Emerleox.K (Microsoft); Flyagent (McAfee); Downloader (Symantec); PAK:UPX, PAK:PE-Crypt.CF, Worm.Win32.AutoRun.bix (Kaspersky); BehavesLike.Win32.Malware.tsc (mx-v) (Sunbelt); Win32.Worm.Delf.NFU (FSecure)

 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:

49,152 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

18 Apr 2012

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:

  • %Program Files%\Common Files\System\_CHAR(0x12)_°!ö
  • %Program Files%\Common Files\Microsoft Shared\h®_CHAR(0x16)_¨XÇfÌø¬Ù2Ķ_CHAR(0x19)__CHAR(0x1A)_ëiÚwW_CHAR(0x19)__CHAR(0x1B)_Hÿwÿø«_CHAR(0x01)_áµÿ¿yèäØ_CHAR(0x1D)__CHAR(0x07)_/ªÇbhhþEAs/_CHAR(0x1C)_û_CHAR(0x1B)_O1„úbÌù_CHAR(0x0F)_íL×ëŠÜ¾H9?OÛ@¾eùÃHغ6oƒ^à_CHAR(0x10)_Ó_CHAR(0x11)_ä_CHAR(0x14)__CHAR(0x0E)_ž¯§ï€¯•!€_CHAR(0x1C)_§5@_CHAR(0x15)_q£›wCàÁù?¢À³ëÎq…ùõ6.exe

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)

Other System Modifications

This worm deletes the following files:

  • %Program Files%\Common Files\System\_CHAR(0x12)_°!ö
  • %Program Files%\Common Files\Microsoft Shared\h®_CHAR(0x16)_¨XÇfÌø¬Ù2Ķ_CHAR(0x19)__CHAR(0x1A)_ëiÚwW_CHAR(0x19)__CHAR(0x1B)_Hÿwÿø«_CHAR(0x01)_áµÿ¿yèäØ_CHAR(0x1D)__CHAR(0x07)_/ªÇbhhþEAs/_CHAR(0x1C)_û_CHAR(0x1B)_O1„úbÌù_CHAR(0x0F)_íL×ëŠÜ¾H9?OÛ@¾eùÃHغ6oƒ^à_CHAR(0x10)_Ó_CHAR(0x11)_ä_CHAR(0x14)__CHAR(0x0E)_ž¯§ï€¯•!€_CHAR(0x1C)_§5@_CHAR(0x15)_q£›wCàÁù?¢À³ëÎq…ùõ6.exe

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)

It deletes the following folders:

  • %Program Files%\Common Files\System\_CHAR(0x12)_°!ö
  • %Program Files%\Common Files\Microsoft Shared\h®_CHAR(0x16)_¨XÇfÌø¬Ù2Ķ_CHAR(0x19)__CHAR(0x1A)_ëiÚwW_CHAR(0x19)__CHAR(0x1B)_Hÿwÿø«_CHAR(0x01)_áµÿ¿yèäØ_CHAR(0x1D)__CHAR(0x07)_/ªÇbhhþEAs/_CHAR(0x1C)_û_CHAR(0x1B)_O1„úbÌù_CHAR(0x0F)_íL×ëŠÜ¾H9?OÛ@¾eùÃHغ6oƒ^à_CHAR(0x10)_Ó_CHAR(0x11)_ä_CHAR(0x14)__CHAR(0x0E)_ž¯§ï€¯•!€_CHAR(0x1C)_§5@_CHAR(0x15)_q£›wCàÁù?¢À³ëÎq…ùõ6.exe

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)

It deletes the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
{random key}

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.200

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 to delete files detected as WORM_EMERLEOX.DP. 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 3

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • %Program Files%\Common Files\System\_CHAR(0x12)_°!ö
  • %Program Files%\Common Files\Microsoft Shared\h®_CHAR(0x16)_¨XÇfÌø¬Ù2Ķ_CHAR(0x19)__CHAR(0x1A)_ëiÚwW_CHAR(0x19)__CHAR(0x1B)_Hÿwÿø«_CHAR(0x01)_áµÿ¿yèäØ_CHAR(0x1D)__CHAR(0x07)_/ªÇbhhþEAs/_CHAR(0x1C)_û_CHAR(0x1B)_O1„úbÌù_CHAR(0x0F)_íL×ëŠÜ¾H9?OÛ@¾eùÃHغ6oƒ^à_CHAR(0x10)_Ó_CHAR(0x11)_ä_CHAR(0x14)__CHAR(0x0E)_ž¯§ï€¯•!€_CHAR(0x1C)_§5@_CHAR(0x15)_q£›wCàÁù?¢À³ëÎq…ùõ6.exe

Step 4

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\Windows NT\CurrentVersion\Image File Execution Options
    • {random key}


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