TROJ_DLOADR.BCF
TrojanDownloader:Win32/Delf.PY (Microsoft); Downloader.a!zo (McAfee); Downloader (Symantec); PAK:UPX, Trojan-Downloader.Win32.Agent.gyds (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Generic.6990205 (FSecure)
Windows 2000, Windows XP, Windows Server 2003
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.
TECHNICAL DETAILS
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 creates the following folders:
- %System Root%\Programdata
- %System Root%\ProgramData\WuqxasR
- %System Root%\ProgramData\WuqxasR\GjatyhU
- %System Root%\ProgramData\WuqxasR\IvgpiiK
- %System Root%\ProgramData\WuqxasR\ClnykqS
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
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\Run
WxjsmkP = "%System Root%\ProgramData\WuqxasR\IvgpiiK\WxjsmkP.exe"
Other System Modifications
This Trojan adds the following registry keys:
HKEY_CURRENT_USER\Software\sistemanet
It adds the following registry entries:
HKEY_CURRENT_USER\Software\sistemanet
direct = "jiijehjibjhojaadjaaajaocjaadjigjaoijfhjigjaafjigjibjhgjaagjaacjabojigjaaejhb)"
HKEY_CURRENT_USER\Software\sistemanet
name1 = "jhgjabojaofjaaejaoijaogjho)"
HKEY_CURRENT_USER\Software\sistemanet
idnome = "jaoijaoajaag)"
HKEY_CURRENT_USER\Software\sistemanet
lugarjpg = {random characters}
HKEY_CURRENT_USER\Software\sistemanet
dir2 = {random characters}
HKEY_CURRENT_USER\Software\sistemanet
dir = {random characters}
HKEY_CURRENT_USER\Software\sistemanet
linka = {random characters}
HKEY_CURRENT_USER\Software\sistemanet
string = {random characters}
HKEY_CURRENT_USER\Software\sistemanet
tbl = "jaafjihjiejiijaohjaoejaabjaoajaae)"
HKEY_CURRENT_USER\Software\sistemanet
aviso = "jaaejaoejaoi)"
HKEY_CURRENT_USER\Software\sistemanet
data = "jeojef)"
Dropping Routine
This Trojan drops the following files:
- %System Root%\Programdata\install.exe
- %System Root%\ProgramData\WuqxasR\ClnykqS\md3.bmp
- %System Root%\ProgramData\WuqxasR\ClnykqS\04-md3
- %System Root%\ProgramData\WuqxasR\GjatyhU\barrafis.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\barrajuri.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\barrauni.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\btazu.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\btlara.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\btper.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\erooagctfis.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\icon6.ico
- %System Root%\ProgramData\WuqxasR\GjatyhU\icon8.ico
- %System Root%\ProgramData\WuqxasR\GjatyhU\img6l.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\img6r.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\img8l.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\img8r.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\imgper.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\it001.html
- %System Root%\ProgramData\WuqxasR\GjatyhU\it002.html
- %System Root%\ProgramData\WuqxasR\GjatyhU\it003.html
- %System Root%\ProgramData\WuqxasR\GjatyhU\pnltbl.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\pnltk.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\programa.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\proseguir.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\sen6.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\tcf.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\tcj.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\tcu.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\telafundotecladofisica.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\telafundotecladojuridica.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\telafundotecladoper.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\telafundotecladouni.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\topfis.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\topjuri.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\topper.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\topuni.bmp
- %System Root%\ProgramData\WuqxasR\IvgpiiK\WxjsmkP.exe
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://dl.{BLOCKED}x.com/u/27621994/apseta.pps
This report is generated via an automated analysis system.
SOLUTION
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
Restart in Safe Mode
Step 3
Delete this registry key
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_CURRENT_USER\Software
- sistemanet
Step 4
Delete this registry value
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- WxjsmkP="%System Root%\ProgramData\WuqxasR\IvgpiiK\WxjsmkP.exe"
- In HKEY_CURRENT_USER\Software\sistemanet
- direct="jiijehjibjhojaadjaaajaocjaadjigjaoijfhjigjaafjigjibjhgjaagjaacjabojigjaaejhb)"
- In HKEY_CURRENT_USER\Software\sistemanet
- name1="jhgjabojaofjaaejaoijaogjho)"
- In HKEY_CURRENT_USER\Software\sistemanet
- idnome="jaoijaoajaag)"
- In HKEY_CURRENT_USER\Software\sistemanet
- lugarjpg={random characters}
- In HKEY_CURRENT_USER\Software\sistemanet
- dir2={random characters}
- In HKEY_CURRENT_USER\Software\sistemanet
- dir={random characters}
- In HKEY_CURRENT_USER\Software\sistemanet
- linka={random characters}
- In HKEY_CURRENT_USER\Software\sistemanet
- string={random characters}
- In HKEY_CURRENT_USER\Software\sistemanet
- tbl="jaafjihjiejiijaohjaoejaabjaoajaae)"
- In HKEY_CURRENT_USER\Software\sistemanet
- aviso="jaaejaoejaoi)"
- In HKEY_CURRENT_USER\Software\sistemanet
- data="jeojef)"
Step 5
Search and delete these files
- %System Root%\Programdata\install.exe
- %System Root%\ProgramData\WuqxasR\ClnykqS\md3.bmp
- %System Root%\ProgramData\WuqxasR\ClnykqS\04-md3
- %System Root%\ProgramData\WuqxasR\GjatyhU\barrafis.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\barrajuri.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\barrauni.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\btazu.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\btlara.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\btper.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\erooagctfis.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\icon6.ico
- %System Root%\ProgramData\WuqxasR\GjatyhU\icon8.ico
- %System Root%\ProgramData\WuqxasR\GjatyhU\img6l.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\img6r.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\img8l.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\img8r.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\imgper.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\it001.html
- %System Root%\ProgramData\WuqxasR\GjatyhU\it002.html
- %System Root%\ProgramData\WuqxasR\GjatyhU\it003.html
- %System Root%\ProgramData\WuqxasR\GjatyhU\pnltbl.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\pnltk.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\programa.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\proseguir.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\sen6.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\tcf.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\tcj.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\tcu.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\telafundotecladofisica.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\telafundotecladojuridica.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\telafundotecladoper.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\telafundotecladouni.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\topfis.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\topjuri.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\topper.bmp
- %System Root%\ProgramData\WuqxasR\GjatyhU\topuni.bmp
- %System Root%\ProgramData\WuqxasR\IvgpiiK\WxjsmkP.exe
Step 6
Search and delete these folders
- %System Root%\Programdata
- %System Root%\ProgramData\WuqxasR
- %System Root%\ProgramData\WuqxasR\GjatyhU
- %System Root%\ProgramData\WuqxasR\IvgpiiK
- %System Root%\ProgramData\WuqxasR\ClnykqS
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_DLOADR.BCF. 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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