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BKDR_POISON.Z

May 09, 2014
 Analysis by: Vincent Martin Hermosura
 ALIASES:

Backdoor.Win32.Poison (Ikarus), Backdoor:Win32/Poison.AK (Microsoft), a variant of Win32/Injector.DZF trojan (Nod32), Virtool.Win32.VBInject.gen (v) (Sunbelt), TR/Dropper.Gen (Antivir),

 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: 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:

97,374 bytes

File Type:

EXE

Memory Resident:

Yes

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 files:

  • %System%\SysInfo33.exe
  • %System%\SysInfo33

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
SysInfo33.exe = "%System%\SysInfo33.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{E14B2A1D-691E-3CCA-A894-2E78F3D10060}
StubPath = "%System%\SysInfo33.exe"

Other System Modifications

This backdoor adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{E14B2A1D-691E-3CCA-A894-2E78F3D10060}

HKEY_CURRENT_USER\Software\Microsoft\
Visual Basic

Other Details

This backdoor connects to the following possibly malicious URL:

  • cracksydius.{BLOCKED}s.org

  SOLUTION

Minimum Scan Engine:

9.700

Step 1

Restart in Safe Mode

[ Learn More ]

Step 2

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • SysInfo33.exe = "%System%\SysInfo33.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{E14B2A1D-691E-3CCA-A894-2E78F3D10060}
    • StubPath = "%System%\SysInfo33.exe"

Step 3

Scan your computer with your Trend Micro product to delete files detected as BKDR_POISON.Z. 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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