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TROJ_AGENT_021195.TOMB

May 05, 2013
 ALIASES:

Trojan:Win32/Malagent (Microsoft); Trojan.Gen (Symantec); Trojan-PSW.Win32.Ruftar.pii, Trojan-PSW.Win32.Ruftar.pii (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Generic.KDV.602660 (FSecure)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 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.

  TECHNICAL DETAILS

File Size:

577,731 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

26 Jun 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.

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\Licenses

HKEY_CLASSES_ROOT\CLSID\{61ABDCD3-A4B0-1FDD-0548-AF650548AF65}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{61ABDCD3-A4B0-1FDD-0548-AF650548AF65}\DefaultIcon

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{61ABDCD3-A4B0-1FDD-0548-AF650548AF65}\InProcServer32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{61ABDCD3-A4B0-1FDD-0548-AF650548AF65}\ShellFolder

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Licenses
{R7C0DB872A3F777C0} = "{random values}"

HKEY_CURRENT_USER\Software\Licenses
{K7C0DB872A3F777C0} = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{61ABDCD3-A4B0-1FDD-0548-AF650548AF65}
LocalizedString = "@%SystemRoot%\system32\SHELL32.dll,-30521"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{61ABDCD3-A4B0-1FDD-0548-AF650548AF65}\InProcServer32
ThreadingModel = "Apartment"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{61ABDCD3-A4B0-1FDD-0548-AF650548AF65}\ShellFolder
Attributes = "218"

HKEY_CURRENT_USER\Software\Licenses
{I6ABE22A0CBF24B58} = "{random values}"

HKEY_CURRENT_USER\Software\Licenses
{06ABE22A0CBF24B58} = "{random values}"

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
RFC1156Agent\CurrentVersion\Parameters
TrapPollTimeMilliSecs = "3a98"

(Note: The default value data of the said registry entry is 3a98.)

It deletes the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{61ABDCD3-A4B0-1FDD-0548-AF650548AF65}\Version

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.200

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

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
    • Licenses
  • In HKEY_CLASSES_ROOT\CLSID
    • {61ABDCD3-A4B0-1FDD-0548-AF650548AF65}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{61ABDCD3-A4B0-1FDD-0548-AF650548AF65}
    • DefaultIcon
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{61ABDCD3-A4B0-1FDD-0548-AF650548AF65}
    • InProcServer32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{61ABDCD3-A4B0-1FDD-0548-AF650548AF65}
    • ShellFolder

Step 3

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\Licenses
    • {R7C0DB872A3F777C0} = "{random values}"
  • In HKEY_CURRENT_USER\Software\Licenses
    • {K7C0DB872A3F777C0} = "{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{61ABDCD3-A4B0-1FDD-0548-AF650548AF65}
    • LocalizedString = "@%SystemRoot%\system32\SHELL32.dll,-30521"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{61ABDCD3-A4B0-1FDD-0548-AF650548AF65}\InProcServer32
    • ThreadingModel = "Apartment"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{61ABDCD3-A4B0-1FDD-0548-AF650548AF65}\ShellFolder
    • Attributes = "218"
  • In HKEY_CURRENT_USER\Software\Licenses
    • {I6ABE22A0CBF24B58} = "{random values}"
  • In HKEY_CURRENT_USER\Software\Licenses
    • {06ABE22A0CBF24B58} = "{random values}"

Step 4

Restore these modified registry values

[ Learn More ]

Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\RFC1156Agent\CurrentVersion\Parameters
    • From: TrapPollTimeMilliSecs = "3a98"
      To: TrapPollTimeMilliSecs = ""3a98""

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_AGENT_021195.TOMB. 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.

Step 6

Restore these deleted registry keys/values from backup

*Note: Only Microsoft-related keys/values will be restored. If the malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{61ABDCD3-A4B0-1FDD-0548-AF650548AF65}
    • Version


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