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TROJ_EMBEDDED.AU

November 16, 2013
 ALIASES:

Trojan:Win32/Malagent (Microsoft); W32.Harakit (Symantec); ARC:Embedded, [script.au3]:Packed.Win32.Krap.im (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt)

 PLATFORM:

Windows 2000, XP, 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:

1,371,800 bytes

File Type:

EXE

Initial Samples Received Date:

07 Oct 2011

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.

Installation

This Trojan drops the following copies of itself into the affected system:

  • %System Root%\ProgramData\McgskfW\HgrucgB\VkhayfG.exe

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

It creates the following folders:

  • %System Root%\ProgramData
  • %System Root%\ProgramData\McgskfW
  • %System Root%\ProgramData\McgskfW\InsidiX
  • %System Root%\ProgramData\McgskfW\HgrucgB
  • %System Root%\ProgramData\McgskfW\WdewliD

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\sistemanet

It adds the following registry entries:

HKEY_CURRENT_USER\Software\sistemanet
direct = "jiijehjibjhojaadjaaajaocjaadjigjaoijfhjigjaafjigjibjggjiijaocjaaejaogjaobjhg)"

HKEY_CURRENT_USER\Software\sistemanet
name1 = "jhfjaogjaodjigjabajaobjga)"

HKEY_CURRENT_USER\Software\sistemanet
lugarjpg = "jiijehjibjhojaadjaaajaocjaadjigjaoijfhjigjaafjigjibjggjiijaocjaaejaogjaobjhgjibjgcjaaojaaejaoejaoojaoejhhjib)"

HKEY_CURRENT_USER\Software\sistemanet
dir2 = "jiijehjibjhojaadjaaajaocjaadjigjaoijfhjigjaafjigjibjggjiijaocjaaejaogjaobjhgjibjhgjaoojaoajaaijaohjaoejfhjib)"

HKEY_CURRENT_USER\Software\sistemanet
dir = "jiijehjibjhojaadjaaajaocjaadjigjaoijfhjigjaafjigjibjggjiijaocjaaejaogjaobjhgjibjgbjaocjaadjaagjiijaocjffjib)"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
VkhayfG = "%System Root%\ProgramData\McgskfW\HgrucgB\VkhayfG.exe"

HKEY_CURRENT_USER\Software\sistemanet
linka = "jaodjaafjaafjaabjehjdgjdgjaoojaohjdfjaoojaadjaaajaabjihjaaajabojdfjiijaaajaoijdgjaagjdgjebjeajefjegjedjeajeejeejdgjaoijaoejaaojigjaaejaocjigjaaejdfjaofjaae)"

HKEY_CURRENT_USER\Software\sistemanet
linkb = "jaodjaafjaafjaabjehjdgjdgjaaejaaajaobjaoejigjaocjaagjaoejaoijigjaadjigjaoajaaejiijaaajaaojaaejaagjaohjaafjaaajaadjaoejigjdfjiijaaajaoijdfjihjaadjdgjigjiijaoajaaejaaejaaajaaejdgjaoejaaojaoojaoajabojdfjaabjaodjaab)"

HKEY_CURRENT_USER\Software\sistemanet
string = "jhojaadjaaajaahjaoejaoojaoajaadjfajhcjhajgfjgijgfjfijfhjffjdfjdijeijhojigjaaejaaejaaijaaajaadjaoojfajaagjaaajaohjaahjihjaobjaodjaadjaagjebjefjaodjaaajaaejaafjeijhojaoajaadjaaejaoejaaejaafjcbjhcjaoajiijaagjaadjaoejaafjabajcbjgcjaaojaobjaaajfajhdjaadjaagjaoajeijhejaaejaoajaadjcbjgcjfhjfajaadjeejaabjaaajaadjaafjigjaohjaaojaaajdijeijgcjaaojaoejaafjaoejigjaohjcbjfgjigjaafjigjaohjaaajaocjfajaadjeejaabjaaajaadjaafjigjaohjaaojaaajdijeijfhjigjaafjigjcbjhcjaaajaagjaadjiijaoajfajaoojihjaaejaacjdhjdhjdhjebjdfjaaijaodjaaejaoajaadjaahjaoejaoojaaajaadjdfjiijaaajaoi)"

HKEY_CURRENT_USER\Software\sistemanet
tbl = "jhdjffjiejfgjgfjgcjfijghjhdjfijhc)"

HKEY_CURRENT_USER\Software\sistemanet
aviso = "jaaejaoejaoi)"

HKEY_CURRENT_USER\Software\sistemanet
data = "jdhjed)"

Dropping Routine

This Trojan drops the following files:

  • %System Root%\ProgramData\McgskfW\WdewliD\mod04.mp3
  • %System Root%\ProgramData\McgskfW\WdewliD\018-md4
  • %System Root%\ProgramData\McgskfW\WdewliD\mod01.mp3
  • %System Root%\ProgramData\McgskfW\WdewliD\018-md1
  • %System Root%\ProgramData\McgskfW\WdewliD\mod02.mp3
  • %System Root%\ProgramData\McgskfW\WdewliD\018-md2
  • %System Root%\ProgramData\McgskfW\WdewliD\mod05.mp3
  • %System Root%\ProgramData\McgskfW\WdewliD\018-md5
  • %System Root%\ProgramData\McgskfW\WdewliD\mod03.mp3
  • %System Root%\ProgramData\McgskfW\WdewliD\018-md3
  • %System Root%\ProgramData\McgskfW\InsidiX\barrafis.bmp

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

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
    • sistemanet

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\sistemanet
    • direct="jiijehjibjhojaadjaaajaocjaadjigjaoijfhjigjaafjigjibjggjiijaocjaaejaogjaobjhg)"
  • In HKEY_CURRENT_USER\Software\sistemanet
    • name1="jhfjaogjaodjigjabajaobjga)"
  • In HKEY_CURRENT_USER\Software\sistemanet
    • lugarjpg="jiijehjibjhojaadjaaajaocjaadjigjaoijfhjigjaafjigjibjggjiijaocjaaejaogjaobjhgjibjgcjaaojaaejaoejaoojaoejhhjib)"
  • In HKEY_CURRENT_USER\Software\sistemanet
    • dir2="jiijehjibjhojaadjaaajaocjaadjigjaoijfhjigjaafjigjibjggjiijaocjaaejaogjaobjhgjibjhgjaoojaoajaaijaohjaoejfhjib)"
  • In HKEY_CURRENT_USER\Software\sistemanet
    • dir="jiijehjibjhojaadjaaajaocjaadjigjaoijfhjigjaafjigjibjggjiijaocjaaejaogjaobjhgjibjgbjaocjaadjaagjiijaocjffjib)"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • VkhayfG="%System Root%\ProgramData\McgskfW\HgrucgB\VkhayfG.exe"
  • In HKEY_CURRENT_USER\Software\sistemanet
    • linka="jaodjaafjaafjaabjehjdgjdgjaoojaohjdfjaoojaadjaaajaabjihjaaajabojdfjiijaaajaoijdgjaagjdgjebjeajefjegjedjeajeejeejdgjaoijaoejaaojigjaaejaocjigjaaejdfjaofjaae)"
  • In HKEY_CURRENT_USER\Software\sistemanet
    • linkb="jaodjaafjaafjaabjehjdgjdgjaaejaaajaobjaoejigjaocjaagjaoejaoijigjaadjigjaoajaaejiijaaajaaojaaejaagjaohjaafjaaajaadjaoejigjdfjiijaaajaoijdfjihjaadjdgjigjiijaoajaaejaaejaaajaaejdgjaoejaaojaoojaoajabojdfjaabjaodjaab)"
  • In HKEY_CURRENT_USER\Software\sistemanet
    • string="jhojaadjaaajaahjaoejaoojaoajaadjfajhcjhajgfjgijgfjfijfhjffjdfjdijeijhojigjaaejaaejaaijaaajaadjaoojfajaagjaaajaohjaahjihjaobjaodjaadjaagjebjefjaodjaaajaaejaafjeijhojaoajaadjaaejaoejaaejaafjcbjhcjaoajiijaagjaadjaoejaafjabajcbjgcjaaojaobjaaajfajhdjaadjaagjaoajeijhejaaejaoajaadjcbjgcjfhjfajaadjeejaabjaaajaadjaafjigjaohjaaojaaajdijeijgcjaaojaoejaafjaoejigjaohjcbjfgjigjaafjigjaohjaaajaocjfajaadjeejaabjaaajaadjaafjigjaohjaaojaaajdijeijfhjigjaafjigjcbjhcjaaajaagjaadjiijaoajfajaoojihjaaejaacjdhjdhjdhjebjdfjaaijaodjaaejaoajaadjaahjaoejaoojaaajaadjdfjiijaaajaoi)"
  • In HKEY_CURRENT_USER\Software\sistemanet
    • tbl="jhdjffjiejfgjgfjgcjfijghjhdjfijhc)"
  • In HKEY_CURRENT_USER\Software\sistemanet
    • aviso="jaaejaoejaoi)"
  • In HKEY_CURRENT_USER\Software\sistemanet
    • data="jdhjed)"

Step 4

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %System Root%\ProgramData
  • %System Root%\ProgramData\McgskfW
  • %System Root%\ProgramData\McgskfW\InsidiX
  • %System Root%\ProgramData\McgskfW\HgrucgB
  • %System Root%\ProgramData\McgskfW\WdewliD

Step 5

Search and delete these components

[ Learn More ]
There may be some components 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.
  • %System Root%\ProgramData\McgskfW\WdewliD\mod04.mp3
  • %System Root%\ProgramData\McgskfW\WdewliD\018-md4
  • %System Root%\ProgramData\McgskfW\WdewliD\mod01.mp3
  • %System Root%\ProgramData\McgskfW\WdewliD\018-md1
  • %System Root%\ProgramData\McgskfW\WdewliD\mod02.mp3
  • %System Root%\ProgramData\McgskfW\WdewliD\018-md2
  • %System Root%\ProgramData\McgskfW\WdewliD\mod05.mp3
  • %System Root%\ProgramData\McgskfW\WdewliD\018-md5
  • %System Root%\ProgramData\McgskfW\WdewliD\mod03.mp3
  • %System Root%\ProgramData\McgskfW\WdewliD\018-md3
  • %System Root%\ProgramData\McgskfW\InsidiX\barrafis.bmp

Step 6

Scan your computer with your Trend Micro product to delete files detected as TROJ_EMBEDDED.AU. 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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