ALIASES:

TrojanDownloader:Win32/Fosniw.C (Microsoft); Downloader.a!bmh (McAfee); Downloader (Symantec); Trojan.Win32.Scar.eggr (Kaspersky); Trojan-Downloader.Win32.Fosniw.c (v) (Sunbelt); Gen:Variant.Graftor.1982 (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: 301,056 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 24 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.

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
1f1f060d1d06065a110c11 = "%User Profile%\Application Data\yirr.exe"

Other System Modifications

This Trojan deletes the following files:

  • %User Profile%\Application Data\yirr.exe

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

It adds the following registry keys:

HKEY_CURRENT_USER\Software\722224fc72a6

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
yirr

It adds the following registry entries:

HKEY_CURRENT_USER\Software\722224fc72a6
idt = "201201140016"

HKEY_CURRENT_USER\Software\722224fc72a6
ver = "1.0.0.11"

HKEY_CURRENT_USER\Software\722224fc72a6
Location = "1f1f060d1d06065a110c11"

HKEY_CURRENT_USER\Software\722224fc72a6
pid = "kkr"

HKEY_CURRENT_USER\Software\722224fc72a6
prj = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
yirr
DisplayName = "Windows IE yirr Uninstall"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
yirr
UninstallString = "%User Profile%\Application Data\yirr.exe uninstall"

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine: 9.200

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
    • 722224fc72a6
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
    • yirr

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
    • 1f1f060d1d06065a110c11 = "%User Profile%\Application Data\yirr.exe"
  • In HKEY_CURRENT_USER\Software\722224fc72a6
    • idt = "201201140016"
  • In HKEY_CURRENT_USER\Software\722224fc72a6
    • ver = "1.0.0.11"
  • In HKEY_CURRENT_USER\Software\722224fc72a6
    • Location = "1f1f060d1d06065a110c11"
  • In HKEY_CURRENT_USER\Software\722224fc72a6
    • pid = "kkr"
  • In HKEY_CURRENT_USER\Software\722224fc72a6
    • prj = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\yirr
    • DisplayName = "Windows IE yirr Uninstall"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\yirr
    • UninstallString = "%User Profile%\Application Data\yirr.exe uninstall"

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_AGENT_023270.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 this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • %User Profile%\Application Data\yirr.exe


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