TROJ_SMALL.MAH

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.

File Size: 61,440 bytes

File Type: EXE

Memory Resident: Yes

Initial Samples Received Date: 01 Jan 2013

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_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
lphc9qwj0erbp = "%System%\lphc9qwj0erbp.exe"

Other System Modifications

This Trojan deletes the following files:

%System%\lphc9qwj0erbp.exe:Zone.Identifier
%User Temp%\.tt2.tmp
%User Temp%\.tt3.tmp
%User Temp%\.tt4.tmp
%User Temp%\.tt5.tmp
%User Temp%\.tt6.tmp
%User Temp%\.tt7.tmp
%User Temp%\.tt8.tmp
%User Temp%\.tt9.tmp
%User Temp%\.ttA.tmp
%User Temp%\.ttB.tmp
%User Temp%\.ttC.tmp
%User Temp%\.ttD.tmp
%User Temp%\.ttE.tmp
%User Temp%\.ttF.tmp
%User Temp%\.tt10.tmp
%User Temp%\.tt11.tmp
%User Temp%\.tt12.tmp
%User Temp%\.tt13.tmp
%User Temp%\.tt14.tmp
%User Temp%\.tt15.tmp
%User Temp%\.tt16.tmp
%User Temp%\.tt17.tmp
%User Temp%\.tt18.tmp
%User Temp%\.tt19.tmp
%User Temp%\.tt1A.tmp
%User Temp%\.tt1B.tmp
%User Temp%\.tt1C.tmp
%User Temp%\.tt1D.tmp
%User Temp%\.tt1E.tmp
%User Temp%\.tt1F.tmp
%User Temp%\.tt20.tmp
%User Temp%\.tt21.tmp
%User Temp%\.tt22.tmp
%User Temp%\.tt23.tmp
%User Temp%\.tt24.tmp
%User Temp%\.tt25.tmp
%User Temp%\.tt26.tmp
%User Temp%\.tt27.tmp
%User Temp%\.tt28.tmp
%User Temp%\.tt29.tmp
%User Temp%\.tt2A.tmp
%User Temp%\.tt2B.tmp
%User Temp%\.tt2C.tmp
%User Temp%\.tt2D.tmp
%User Temp%\.tt2E.tmp
%User Temp%\.tt2F.tmp
%User Temp%\.tt30.tmp
%User Temp%\.tt31.tmp
%User Temp%\.tt32.tmp
%User Temp%\.tt33.tmp
%User Temp%\.tt34.tmp
%User Temp%\.tt35.tmp
%User Temp%\.tt36.tmp
%User Temp%\.tt37.tmp
%User Temp%\.tt38.tmp
%User Temp%\.tt39.tmp
%User Temp%\.tt3A.tmp
%User Temp%\.tt3B.tmp
%User Temp%\.tt3C.tmp
%User Temp%\.tt3D.tmp
%User Temp%\.tt3E.tmp
%User Temp%\.tt3F.tmp
%User Temp%\.tt40.tmp
%User Temp%\.tt41.tmp
%User Temp%\.tt42.tmp
%User Temp%\.tt43.tmp
%User Temp%\.tt44.tmp
%User Temp%\.tt45.tmp
%User Temp%\.tt46.tmp
%User Temp%\.tt47.tmp
%User Temp%\.tt48.tmp
%User Temp%\.tt49.tmp
%User Temp%\.tt4A.tmp
%User Temp%\.tt4B.tmp
%User Temp%\.tt4C.tmp
%User Temp%\.tt4D.tmp
%User Temp%\.tt4E.tmp
%User Temp%\.tt4F.tmp
%User Temp%\.tt50.tmp
%User Temp%\.tt51.tmp
%User Temp%\.tt52.tmp
%User Temp%\.tt53.tmp
%User Temp%\.tt54.tmp
%User Temp%\.tt55.tmp
%User Temp%\.tt56.tmp
%User Temp%\.tt57.tmp
%User Temp%\.tt58.tmp
%User Temp%\.tt59.tmp
%User Temp%\.tt5A.tmp
%User Temp%\.tt5B.tmp
%User Temp%\.tt5C.tmp
%User Temp%\.tt5D.tmp
%User Temp%\.tt5E.tmp
%User Temp%\.tt5F.tmp
%User Temp%\.tt60.tmp
%User Temp%\.tt61.tmp
%User Temp%\.tt62.tmp
%User Temp%\.tt63.tmp
%User Temp%\.tt64.tmp
%User Temp%\.tt65.tmp
%User Temp%\.tt66.tmp
%User Temp%\.tt67.tmp
%User Temp%\.tt68.tmp
%User Temp%\.tt69.tmp
%User Temp%\.tt6A.tmp
%User Temp%\.tt6B.tmp
%User Temp%\.tt6C.tmp
%User Temp%\.tt6D.tmp
%User Temp%\.tt6E.tmp
%User Temp%\.tt6F.tmp
%User Temp%\.tt70.tmp
%User Temp%\.tt71.tmp
%User Temp%\.tt72.tmp
%User Temp%\.tt73.tmp
%User Temp%\.tt74.tmp
%User Temp%\.tt75.tmp
%User Temp%\.tt76.tmp
%User Temp%\.tt77.tmp
%User Temp%\.tt78.tmp
%User Temp%\.tt79.tmp
%User Temp%\.tt7A.tmp
%User Temp%\.tt7B.tmp
%User Temp%\.tt7C.tmp
%User Temp%\.tt7D.tmp
%User Temp%\.tt7E.tmp
%User Temp%\.tt7F.tmp
%User Temp%\.tt80.tmp
%User Temp%\.tt81.tmp
%User Temp%\.tt82.tmp
%User Temp%\.tt83.tmp
%User Temp%\.tt84.tmp
%User Temp%\.tt85.tmp
%User Temp%\.tt86.tmp
%User Temp%\.tt87.tmp
%User Temp%\.tt88.tmp
%User Temp%\.tt89.tmp
%User Temp%\.tt8A.tmp
%User Temp%\.tt8B.tmp

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

It adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Software Notifier

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Software Notifier
InstallID = "fb19d433-88b5-49e9-979a-191134bb6e73"

Dropping Routine

This Trojan drops the following files:

%User Temp%\.tt1.tmp.vbs

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

Other Details

This Trojan connects to the following possibly malicious URL:

http://windowsupdate.{BLOCKED}oft.com
http://{BLOCKED}rusxp08.net/{random path}

This report is generated via an automated analysis system.

Minimum Scan Engine: 9.300

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

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_LOCAL_MACHINE\SOFTWARE\Microsoft
- Software Notifier

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- lphc9qwj0erbp = "%System%\lphc9qwj0erbp.exe"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Software Notifier
- InstallID = "fb19d433-88b5-49e9-979a-191134bb6e73"

Step 5

Search and delete this file

[ Learn More ]

There may be some 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.

%User Temp%\.tt1.tmp.vbs

Step 6

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_SMALL.MAH. 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 7

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.

%System%\lphc9qwj0erbp.exe:Zone.Identifier
%User Temp%\.tt2.tmp
%User Temp%\.tt3.tmp
%User Temp%\.tt4.tmp
%User Temp%\.tt5.tmp
%User Temp%\.tt6.tmp
%User Temp%\.tt7.tmp
%User Temp%\.tt8.tmp
%User Temp%\.tt9.tmp
%User Temp%\.ttA.tmp
%User Temp%\.ttB.tmp
%User Temp%\.ttC.tmp
%User Temp%\.ttD.tmp
%User Temp%\.ttE.tmp
%User Temp%\.ttF.tmp
%User Temp%\.tt10.tmp
%User Temp%\.tt11.tmp
%User Temp%\.tt12.tmp
%User Temp%\.tt13.tmp
%User Temp%\.tt14.tmp
%User Temp%\.tt15.tmp
%User Temp%\.tt16.tmp
%User Temp%\.tt17.tmp
%User Temp%\.tt18.tmp
%User Temp%\.tt19.tmp
%User Temp%\.tt1A.tmp
%User Temp%\.tt1B.tmp
%User Temp%\.tt1C.tmp
%User Temp%\.tt1D.tmp
%User Temp%\.tt1E.tmp
%User Temp%\.tt1F.tmp
%User Temp%\.tt20.tmp
%User Temp%\.tt21.tmp
%User Temp%\.tt22.tmp
%User Temp%\.tt23.tmp
%User Temp%\.tt24.tmp
%User Temp%\.tt25.tmp
%User Temp%\.tt26.tmp
%User Temp%\.tt27.tmp
%User Temp%\.tt28.tmp
%User Temp%\.tt29.tmp
%User Temp%\.tt2A.tmp
%User Temp%\.tt2B.tmp
%User Temp%\.tt2C.tmp
%User Temp%\.tt2D.tmp
%User Temp%\.tt2E.tmp
%User Temp%\.tt2F.tmp
%User Temp%\.tt30.tmp
%User Temp%\.tt31.tmp
%User Temp%\.tt32.tmp
%User Temp%\.tt33.tmp
%User Temp%\.tt34.tmp
%User Temp%\.tt35.tmp
%User Temp%\.tt36.tmp
%User Temp%\.tt37.tmp
%User Temp%\.tt38.tmp
%User Temp%\.tt39.tmp
%User Temp%\.tt3A.tmp
%User Temp%\.tt3B.tmp
%User Temp%\.tt3C.tmp
%User Temp%\.tt3D.tmp
%User Temp%\.tt3E.tmp
%User Temp%\.tt3F.tmp
%User Temp%\.tt40.tmp
%User Temp%\.tt41.tmp
%User Temp%\.tt42.tmp
%User Temp%\.tt43.tmp
%User Temp%\.tt44.tmp
%User Temp%\.tt45.tmp
%User Temp%\.tt46.tmp
%User Temp%\.tt47.tmp
%User Temp%\.tt48.tmp
%User Temp%\.tt49.tmp
%User Temp%\.tt4A.tmp
%User Temp%\.tt4B.tmp
%User Temp%\.tt4C.tmp
%User Temp%\.tt4D.tmp
%User Temp%\.tt4E.tmp
%User Temp%\.tt4F.tmp
%User Temp%\.tt50.tmp
%User Temp%\.tt51.tmp
%User Temp%\.tt52.tmp
%User Temp%\.tt53.tmp
%User Temp%\.tt54.tmp
%User Temp%\.tt55.tmp
%User Temp%\.tt56.tmp
%User Temp%\.tt57.tmp
%User Temp%\.tt58.tmp
%User Temp%\.tt59.tmp
%User Temp%\.tt5A.tmp
%User Temp%\.tt5B.tmp
%User Temp%\.tt5C.tmp
%User Temp%\.tt5D.tmp
%User Temp%\.tt5E.tmp
%User Temp%\.tt5F.tmp
%User Temp%\.tt60.tmp
%User Temp%\.tt61.tmp
%User Temp%\.tt62.tmp
%User Temp%\.tt63.tmp
%User Temp%\.tt64.tmp
%User Temp%\.tt65.tmp
%User Temp%\.tt66.tmp
%User Temp%\.tt67.tmp
%User Temp%\.tt68.tmp
%User Temp%\.tt69.tmp
%User Temp%\.tt6A.tmp
%User Temp%\.tt6B.tmp
%User Temp%\.tt6C.tmp
%User Temp%\.tt6D.tmp
%User Temp%\.tt6E.tmp
%User Temp%\.tt6F.tmp
%User Temp%\.tt70.tmp
%User Temp%\.tt71.tmp
%User Temp%\.tt72.tmp
%User Temp%\.tt73.tmp
%User Temp%\.tt74.tmp
%User Temp%\.tt75.tmp
%User Temp%\.tt76.tmp
%User Temp%\.tt77.tmp
%User Temp%\.tt78.tmp
%User Temp%\.tt79.tmp
%User Temp%\.tt7A.tmp
%User Temp%\.tt7B.tmp
%User Temp%\.tt7C.tmp
%User Temp%\.tt7D.tmp
%User Temp%\.tt7E.tmp
%User Temp%\.tt7F.tmp
%User Temp%\.tt80.tmp
%User Temp%\.tt81.tmp
%User Temp%\.tt82.tmp
%User Temp%\.tt83.tmp
%User Temp%\.tt84.tmp
%User Temp%\.tt85.tmp
%User Temp%\.tt86.tmp
%User Temp%\.tt87.tmp
%User Temp%\.tt88.tmp
%User Temp%\.tt89.tmp
%User Temp%\.tt8A.tmp
%User Temp%\.tt8B.tmp

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