Analysis by: Jennifer Gumban
ALIASES:

Worm:Win32/Gamarue.W (Microsoft), Trojan.Win32.Agent.hwve (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 modifies the Internet Explorer Zone Settings.

  TECHNICAL DETAILS

File Size: 338,062 bytes
File Type: Other
Initial Samples Received Date: 09 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.

Autostart Technique

This worm adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
{Random Number} = "%TEMP%\{Random Characters}.exe"

Other System Modifications

This worm adds the following registry entries:

HKEY_CURRENT_USER\Software
DOS_STUB = "{Random Hex Values}"

HKEY_CURRENT_USER\Software
IMAGE_FILE_HEADER = "{Random Hex Values}"

HKEY_CURRENT_USER\Software
ImageBase = "{Random Hex Values}"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\ShellNoRoam\MUICache\
%TEMP%
fp_pl_pfs_installer.exe = "Pekir"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft
{DWORD} = "{Random Hex Values}"

Web Browser Home Page and Search Page Modification

This worm modifies the Internet Explorer Zone Settings.

Other Details

This worm connects to the following possibly malicious URL:

  • http://m.{BLOCKED}eavy.ru/m
  • http://a.{BLOCKED}eavy.ru/a?=xjkxjkxyklyzlmzlmzamnabnobnobcoz
  • http://b.{BLOCKED}eavy.ru/b?=dpqdeqrsfgstghtuhijvxjkxyklyzamx
  • http://c.{BLOCKED}eavy.ru/c?=refrsfghtuhiuvijvxyklyzlmzamnobl
  • http://{BLOCKED}uojy.ru/2ldr.php
  • http://{BLOCKED}uojy.ru/3ldr.php
  • http://{BLOCKED}uojy.ru/41ldr.php
  • http://{BLOCKED}uojy.ru/51ldr.php
  • http://{BLOCKED}uojy.ru/6ldr.php
  • http://{BLOCKED}d.ru/static.php

It drops the following file(s)/component(s):

  • %All Users Profile%\Local Settings\Temp\{Random Characters}.exe
  • %System%\MSI\TrustedInstaller.exe
  • %TEMP%\fp_pl_pfs_installer.exe

(Note: %All Users Profile% is the All Users or Common profile folder, which is C:\Documents and Settings\All Users in Windows 2000, XP, and Server 2003, and C:\ProgramData in Windows Vista and 7.. %System% is the Windows system folder, which is usually C:\Windows\System32.)