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BKDR_HUPIGON.XZA

November 16, 2012
 ALIASES:

Rogue:Win32/FakeSpypro (Microsoft); FakeAlert-SpyPro.gen.bc (McAfee); Trojan Horse (Symantec); Trojan-FakeAV.Win32.WinSpywareProtect.gp (Kaspersky); Trojan-Downloader.Win32.Small.abgd (v) (Sunbelt); Trojan.Tibs.NT (FSecure)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This backdoor 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:

363,016 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

16 Nov 2012

Arrival Details

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

  • %Windows%\sysguard.exe

(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
sysguard = "%Windows%\sysguard.exe"

Other System Modifications

This backdoor adds the following registry keys:

HKEY_CURRENT_USER\Software\AvScan

It adds the following registry entries:

HKEY_CURRENT_USER\Software\AvScan
aazalirt = "1"

HKEY_CURRENT_USER\Software\AvScan
skaaanret = "1"

HKEY_CURRENT_USER\Software\AvScan
jungertab = "1"

HKEY_CURRENT_USER\Software\AvScan
zibaglertz = "1"

HKEY_CURRENT_USER\Software\AvScan
iddqdops = "1"

HKEY_CURRENT_USER\Software\AvScan
ronitfst = "1"

HKEY_CURRENT_USER\Software\AvScan
tobmygers = "1"

HKEY_CURRENT_USER\Software\AvScan
jikglond = "1"

HKEY_CURRENT_USER\Software\AvScan
tobykke = "1"

HKEY_CURRENT_USER\Software\AvScan
klopnidret = "1"

HKEY_CURRENT_USER\Software\AvScan
jiklagka = "1"

HKEY_CURRENT_USER\Software\AvScan
salrtybek = "1"

HKEY_CURRENT_USER\Software\AvScan
seeukluba = "1"

HKEY_CURRENT_USER\Software\AvScan
jrjakdsd = "1"

HKEY_CURRENT_USER\Software\AvScan
krkdkdkee = "1"

HKEY_CURRENT_USER\Software\AvScan
dkewiizkjdks = "1"

HKEY_CURRENT_USER\Software\AvScan
dkekkrkska = "1"

HKEY_CURRENT_USER\Software\AvScan
rkaskssd = "1"

HKEY_CURRENT_USER\Software\AvScan
kuruhccdsdd = "1"

HKEY_CURRENT_USER\Software\AvScan
krujmmwlrra = "1"

HKEY_CURRENT_USER\Software\AvScan
kkwknrbsggeg = "1"

HKEY_CURRENT_USER\Software\AvScan
ktknamwerr = "1"

HKEY_CURRENT_USER\Software\AvScan
iqmcnoeqz = "1"

HKEY_CURRENT_USER\Software\AvScan
ienotas = "1"

HKEY_CURRENT_USER\Software\AvScan
krkmahejdk = "1"

HKEY_CURRENT_USER\Software\AvScan
otpeppggq = "1"

HKEY_CURRENT_USER\Software\AvScan
krtawefg = "1"

HKEY_CURRENT_USER\Software\AvScan
oranerkka = "1"

HKEY_CURRENT_USER\Software\AvScan
kitiiwhaas = "1"

HKEY_CURRENT_USER\Software\AvScan
otowjdseww = "1"

HKEY_CURRENT_USER\Software\AvScan
otnnbektre = "1"

HKEY_CURRENT_USER\Software\AvScan
oropbbsee = "1"

HKEY_CURRENT_USER\Software\AvScan
irprokwks = "1"

HKEY_CURRENT_USER\Software\AvScan
ooorjaas = "1"

HKEY_CURRENT_USER\Software\AvScan
id = "19.1"

Dropping Routine

This backdoor drops the following files:

  • %System%\iehelper.dll

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

Other Details

This backdoor connects to the following possibly malicious URL:

  • http://spywrprotect-2009.{BLOCKED}ds.php?r=19.1

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.300

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

[ Learn More ]

Step 3

Delete this registry key

[ Learn More ]

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
    • AvScan

Step 4

Delete this registry value

[ Learn More ]

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
    • sysguard = "%Windows%\sysguard.exe"
  • In HKEY_CURRENT_USER\Software\AvScan
    • aazalirt = "1"
  • In HKEY_CURRENT_USER\Software\AvScan
    • skaaanret = "1"
  • In HKEY_CURRENT_USER\Software\AvScan
    • jungertab = "1"
  • In HKEY_CURRENT_USER\Software\AvScan
    • zibaglertz = "1"
  • In HKEY_CURRENT_USER\Software\AvScan
    • iddqdops = "1"
  • In HKEY_CURRENT_USER\Software\AvScan
    • ronitfst = "1"
  • In HKEY_CURRENT_USER\Software\AvScan
    • tobmygers = "1"
  • In HKEY_CURRENT_USER\Software\AvScan
    • jikglond = "1"
  • In HKEY_CURRENT_USER\Software\AvScan
    • tobykke = "1"
  • In HKEY_CURRENT_USER\Software\AvScan
    • klopnidret = "1"
  • In HKEY_CURRENT_USER\Software\AvScan
    • jiklagka = "1"
  • In HKEY_CURRENT_USER\Software\AvScan
    • salrtybek = "1"
  • In HKEY_CURRENT_USER\Software\AvScan
    • seeukluba = "1"
  • In HKEY_CURRENT_USER\Software\AvScan
    • jrjakdsd = "1"
  • In HKEY_CURRENT_USER\Software\AvScan
    • krkdkdkee = "1"
  • In HKEY_CURRENT_USER\Software\AvScan
    • dkewiizkjdks = "1"
  • In HKEY_CURRENT_USER\Software\AvScan
    • dkekkrkska = "1"
  • In HKEY_CURRENT_USER\Software\AvScan
    • rkaskssd = "1"
  • In HKEY_CURRENT_USER\Software\AvScan
    • kuruhccdsdd = "1"
  • In HKEY_CURRENT_USER\Software\AvScan
    • krujmmwlrra = "1"
  • In HKEY_CURRENT_USER\Software\AvScan
    • kkwknrbsggeg = "1"
  • In HKEY_CURRENT_USER\Software\AvScan
    • ktknamwerr = "1"
  • In HKEY_CURRENT_USER\Software\AvScan
    • iqmcnoeqz = "1"
  • In HKEY_CURRENT_USER\Software\AvScan
    • ienotas = "1"
  • In HKEY_CURRENT_USER\Software\AvScan
    • krkmahejdk = "1"
  • In HKEY_CURRENT_USER\Software\AvScan
    • otpeppggq = "1"
  • In HKEY_CURRENT_USER\Software\AvScan
    • krtawefg = "1"
  • In HKEY_CURRENT_USER\Software\AvScan
    • oranerkka = "1"
  • In HKEY_CURRENT_USER\Software\AvScan
    • kitiiwhaas = "1"
  • In HKEY_CURRENT_USER\Software\AvScan
    • otowjdseww = "1"
  • In HKEY_CURRENT_USER\Software\AvScan
    • otnnbektre = "1"
  • In HKEY_CURRENT_USER\Software\AvScan
    • oropbbsee = "1"
  • In HKEY_CURRENT_USER\Software\AvScan
    • irprokwks = "1"
  • In HKEY_CURRENT_USER\Software\AvScan
    • ooorjaas = "1"
  • In HKEY_CURRENT_USER\Software\AvScan
    • id = "19.1"

Step 5

Search and delete this file

[ Learn More ]
There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files and folders in the search result.
  • %System%\iehelper.dll

Step 6

Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_HUPIGON.XZA. 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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