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WORM_KOLAB.HC

May 01, 2014
 Analysis by: Sabrina Lei Sioting
 Modified by: Mark Joseph Manahan
 ALIASES:

Troj/Nyrate-L (Sophos), W32/Kryptik.ANN!tr (Fortinet) ,W32/FraudLoad.B.gen!Eldorado (generic, not disinfectable) (Fprot) ,Worm:Win32/Rimecud.B (Microsoft) ,W32/Rimecud.gen.bm (McAfee) ,a variant of Win32/Injector.AWY trojan (Eset) ,W32.Pilleuz (Symantec) ,Generic (Panda)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Propagates via instant messaging applications, Propagates via flashdrives, Propagates via peer-to-peer networks

This worm arrives via removable drives. It 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:

332,295 bytes

File Type:

EXE

Initial Samples Received Date:

02 Oct 2012

Payload:

Compromises system security

Arrival Details

This worm arrives via removable drives.

It 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 non-malicious files:

  • %System Root%\RECYCLER\{SID}\Desktop.ini
  • {drive letter}:\usecure\Desktop.ini

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

It drops the following copies of itself into the affected system:

  • %System Root%\RECYCLER\{SID}\MsMxEng.exe

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

It creates the following folders:

  • %System Root%\RECYCLER\{SID}

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

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 = "%System Root%\RECYCLER\{SID}\MsMxEng.exe"

Propagation

This worm creates the following folders in all removable drives:

  • usecure

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

  • usecure\usecure32.exe

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

The said .INF file contains the following strings:

;{garbage code}
[autorun
;{garbage code}
open=usecure/usecure32.exe
;{garbage code}
icon=%SystemRoot%\system32\SHELL32.dll,4
;{garbage code}
action=Open folder to view files using Windows Explorer
;{garbage code}
USEAUToplay=1
;{garbage code}
shell\open\\command=usecure/usecure32.exe
;{garbage code}
shell\\explore\command=usecure/usecure32.exe
;{garbage code}

Other Details

This worm connects to the following possibly malicious URL:

  • {BLOCKED}mind.cn
  • {BLOCKED}racypetition.com
  • {BLOCKED}slounge.com