Modified by: Rhena Inocencio
ALIASES:

TrojanDownloader:Win32/Dofoil.R (Microsoft), Trojan.Win32.Jorik.Mokes.cfr (Kaspersky), Trojan.Ransomlock!g32 (Symantec), Win32/TrojanDownloader.Zurgop.AW trojan (NOD32), Trojan-Downloader.Win32.Dofoil (Sunbelt)

 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:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It deletes the initially executed copy of itself.

  TECHNICAL DETAILS

File Size: 93,184 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 23 Nov 2012

Arrival Details

This Trojan 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 Trojan drops the following copies of itself into the affected system:

  • %Application Data%\{random folder name}\{random file name}.exe

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)

It injects codes into the following process(es):

  • svchost.exe

Autostart Technique

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

HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
SourceTec = "%Application Data%\{random folder name}\{random file name}.exe"

Other Details

This Trojan connects to the following possibly malicious URL:

  • {BLOCKED}04.{BLOCKED}loose.co

It deletes the initially executed copy of itself