Content

Generic Dropper.ay!c92b2e36a8fc

Type
Trojan
SubType
-
Discovery Date
04/15/2009
Length
100864
Minimum DAT
5584 (04/14/2009)
Updated DAT
5584 (04/14/2009)
Minimum Engine
5300.2777
Description Added
04/15/2009
Description Modified
04/15/2009 3:45 AM (PT)
Risk Assessment
Corporate User
Low
Home User
Low

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Characteristics

File PropertyProperty Value
FileNamefreeac~1.exe
McAfee ArtemisArtemis!c92b2e36a8fc
McAfee DetectionGeneric Dropper.ay
Length100,864 bytes
CRC1D1702A8
MD5C92B2E36A8FCF8CA1EF6ABDE8D263FBC
SHA1317B08EE14838A7FD794A3FEDF6BB8BCFD00A158

Other Common Detection Aliases

Company NameDetection Name
ahnlabDropper/Agent.100864.H
avastWin32:Trojan-gen {Other}
AVG (GriSoft)Dropper.Delf
AviraBDS/Hupigon.Gen
BitDefenderBackdoor.Hupigon.120618
Dr.WebTrojan.Inject.4603
Eseta variant of Win32/TrojanDropper.Delf.NFH
FortiNetW32/Dropper.G!tr
F-ProtW32/Agent.S.gen!Eldorado
KasperskyTrojan-Dropper.Win32.Agent.zto
microsoftvirtool:win32/delfinject.gen!w
normanW32/Hupigon.EJYP
pandaTrj/Downloader.MDW
SophosMal/Dropper-G
SymantecBackdoor.Trojan
vba32Trojan-Dropper.Win32.Agent.zto
Vet (Computer Associates)
Win32/Benload.B

Avert® Labs has observed the following system activities:

ActivityRisk Level
Modifies memory of other processes
Critical
Enumerates running processes
Medium
Uses shared memory of other processes
Low
Performs a shell execute of downloaded or existing files
Informational

Other detections that have been observed.

FileNameMcAfee Supported
%WINDIR%\system32\gpkrsrc32.dll
Downloader-BMN

System Changes

These are general defaults for typical path variables. (Although they may differ, these examples are common.):
%WinDir% = \WINDOWS (Windows 9x/ME/XP/Vista), \WINNT (Windows NT/2000)
%SystemDir% = \WINDOWS\SYSTEM (Windows 98/ME), \WINDOWS\SYSTEM32 (Windows XP/Vista), \WINNT\SYSTEM32 (Windows NT/2000)
%ProgramFiles% = \Program Files

The following files were analyzed:

  • %USERPROFILE%\local settings\temp\freeac~1.exe
  • The following files have been added to the system:

  • %USERPROFILE%\application data\55274-640-2001945-23725502c.manifest
  • %USERPROFILE%\application data\55274-640-2001945-23725502o.manifest
  • %USERPROFILE%\application data\55274-640-2001945-23725502p.manifest
  • %USERPROFILE%\application data\55274-640-2001945-23725502s.manifest
  • %WINDIR%\system32\gpkrsrc32.dll
  • The following registry elements have been created:

  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows nt\currentversion\winlogon\notify\74630177502\
    • dllname = c:\windows\system32\gpkrsrc32.dll
    • startup = eventstartup
  • The following registry elements have been changed:

  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows nt\currentversion\Windows\
    • appinit_dlls = c:\windows\system32\gpkrsrc32.dll
  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\currentversion\explorer\
    • 74630177 = -572593936
  • Symptoms

    This symptoms of this detection are the files, registry, and network communication referenced in the characteristics section.

    Method of Infection

    Trojans do not self-replicate. They are spread manually, often under the premise that the executable is something beneficial. Distribution channels include IRC, peer-to-peer networks, newsgroup postings, e-mail, etc.

    Removal

    AVERT recommends to always use latest DATs and engine. This threat will be cleaned if you have this combination.

    Additional Windows ME/XP removal considerations

    Variants

    Variants

      N/A

    All Information

    Overview -

    This is a Trojan detection. Unlike viruses, Trojans do not self-replicate. They are spread manually, often under the premise that they are beneficial or wanted. The most common installation methods involve system or security exploitation, and unsuspecting users manually executing unknown programs. Distribution channels include e-mail, malicious or hacked Web pages, Internet Relay Chat (IRC), peer-to-peer networks, etc.

    Characteristics

    Characteristics -

    File PropertyProperty Value
    FileNamefreeac~1.exe
    McAfee ArtemisArtemis!c92b2e36a8fc
    McAfee DetectionGeneric Dropper.ay
    Length100,864 bytes
    CRC1D1702A8
    MD5C92B2E36A8FCF8CA1EF6ABDE8D263FBC
    SHA1317B08EE14838A7FD794A3FEDF6BB8BCFD00A158

    Other Common Detection Aliases

    Company NameDetection Name
    ahnlabDropper/Agent.100864.H
    avastWin32:Trojan-gen {Other}
    AVG (GriSoft)Dropper.Delf
    AviraBDS/Hupigon.Gen
    BitDefenderBackdoor.Hupigon.120618
    Dr.WebTrojan.Inject.4603
    Eseta variant of Win32/TrojanDropper.Delf.NFH
    FortiNetW32/Dropper.G!tr
    F-ProtW32/Agent.S.gen!Eldorado
    KasperskyTrojan-Dropper.Win32.Agent.zto
    microsoftvirtool:win32/delfinject.gen!w
    normanW32/Hupigon.EJYP
    pandaTrj/Downloader.MDW
    SophosMal/Dropper-G
    SymantecBackdoor.Trojan
    vba32Trojan-Dropper.Win32.Agent.zto
    Vet (Computer Associates)
    Win32/Benload.B

    Avert® Labs has observed the following system activities:

    ActivityRisk Level
    Modifies memory of other processes
    Critical
    Enumerates running processes
    Medium
    Uses shared memory of other processes
    Low
    Performs a shell execute of downloaded or existing files
    Informational

    Other detections that have been observed.

    FileNameMcAfee Supported
    %WINDIR%\system32\gpkrsrc32.dll
    Downloader-BMN

    System Changes

    These are general defaults for typical path variables. (Although they may differ, these examples are common.):
    %WinDir% = \WINDOWS (Windows 9x/ME/XP/Vista), \WINNT (Windows NT/2000)
    %SystemDir% = \WINDOWS\SYSTEM (Windows 98/ME), \WINDOWS\SYSTEM32 (Windows XP/Vista), \WINNT\SYSTEM32 (Windows NT/2000)
    %ProgramFiles% = \Program Files

    The following files were analyzed:

  • %USERPROFILE%\local settings\temp\freeac~1.exe
  • The following files have been added to the system:

  • %USERPROFILE%\application data\55274-640-2001945-23725502c.manifest
  • %USERPROFILE%\application data\55274-640-2001945-23725502o.manifest
  • %USERPROFILE%\application data\55274-640-2001945-23725502p.manifest
  • %USERPROFILE%\application data\55274-640-2001945-23725502s.manifest
  • %WINDIR%\system32\gpkrsrc32.dll
  • The following registry elements have been created:

  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows nt\currentversion\winlogon\notify\74630177502\
    • dllname = c:\windows\system32\gpkrsrc32.dll
    • startup = eventstartup
  • The following registry elements have been changed:

  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows nt\currentversion\Windows\
    • appinit_dlls = c:\windows\system32\gpkrsrc32.dll
  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\currentversion\explorer\
    • 74630177 = -572593936
  • Symptoms

    Symptoms -

    This symptoms of this detection are the files, registry, and network communication referenced in the characteristics section.

    Method of Infection

    Method of Infection -

    Trojans do not self-replicate. They are spread manually, often under the premise that the executable is something beneficial. Distribution channels include IRC, peer-to-peer networks, newsgroup postings, e-mail, etc.

    Removal -

    Removal -

    AVERT recommends to always use latest DATs and engine. This threat will be cleaned if you have this combination.

    Additional Windows ME/XP removal considerations

    Variants

    Variants -

      N/A