TROJ_AGENT.AJLA

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.

It deletes itself after execution.

File Size: 348,160 bytes

File Type: EXE

Memory Resident: No

Initial Samples Received Date: 15 Jul 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.

Installation

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

%System%\.dll
%System%\.nls
%System%\.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

Other System Modifications

This Trojan deletes the following files:

%System Root%\autorun.inf
%System Root%\.exe
d:\autorun.inf
d:\.exe
e:\autorun.inf
e:\.exe
f:\autorun.inf
f:\.exe
g:\autorun.inf
g:\.exe
h:\autorun.inf
h:\.exe
i:\autorun.inf
i:\.exe
j:\autorun.inf
j:\.exe
k:\autorun.inf
k:\.exe
l:\autorun.inf
l:\.exe
m:\autorun.inf
m:\.exe
n:\autorun.inf
n:\.exe
o:\autorun.inf
o:\.exe
p:\autorun.inf
p:\.exe
q:\autorun.inf
q:\.exe
r:\autorun.inf
r:\.exe
s:\autorun.inf
s:\.exe
t:\autorun.inf
t:\.exe
u:\autorun.inf
u:\.exe
v:\autorun.inf
v:\.exe
w:\autorun.inf
w:\.exe
x:\autorun.inf
x:\.exe
y:\autorun.inf
y:\.exe
z:\autorun.inf
z:\.exe
%User Startup%\.exe
%Common Startup%\.exe
%System%\REDATE.DAT
%Temp%\.txt
%System%\.txt

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.. %Common Startup% is the system's shared Startup folder, which is usually C:\Documents and Settings\All Users\Start Menu\Programs\Startup on Windows 2000, XP, and Server 2003.. %System% is the Windows system folder, which is usually C:\Windows\System32.. %Temp% is the Windows Temporary folder, which is usually C:\Windows\Temp.)

It deletes the following folders:

%System Root%\autorun.inf
%System Root%\.exe
d:\autorun.inf
d:\.exe
e:\autorun.inf
e:\.exe
f:\autorun.inf
f:\.exe
g:\autorun.inf
g:\.exe
h:\autorun.inf
h:\.exe
i:\autorun.inf
i:\.exe
j:\autorun.inf
j:\.exe
k:\autorun.inf
k:\.exe
l:\autorun.inf
l:\.exe
m:\autorun.inf
m:\.exe
n:\autorun.inf
n:\.exe
o:\autorun.inf
o:\.exe
p:\autorun.inf
p:\.exe
q:\autorun.inf
q:\.exe
r:\autorun.inf
r:\.exe
s:\autorun.inf
s:\.exe
t:\autorun.inf
t:\.exe
u:\autorun.inf
u:\.exe
v:\autorun.inf
v:\.exe
w:\autorun.inf
w:\.exe
x:\autorun.inf
x:\.exe
y:\autorun.inf
y:\.exe
z:\autorun.inf
z:\.exe

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

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ShowSuperHidden = "0"

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced\Folder\Hidden\
SHOWALL
CheckedValue = "1"

(Note: The default value data of the said registry entry is 1.)

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess
Start = "4"

(Note: The default value data of the said registry entry is 2.)

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\helpsvc
Start = "4"

(Note: The default value data of the said registry entry is 2.)

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\wscsvc
Start = "4"

(Note: The default value data of the said registry entry is 2.)

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\wuauserv
Start = "4"

(Note: The default value data of the said registry entry is 2.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced\Folder\Hidden\
SHOWALL
Type = "radio"

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced\Folder\SuperHidden
Type = "checkbox2"

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

It deletes the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\SafeBoot\Minimal\
{4D36E967-E325-11CE-BFC1-08002BE10318}

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\SafeBoot\Network\
{4D36E967-E325-11CE-BFC1-08002BE10318}

Dropping Routine

This Trojan drops the following files:

%System%\IMES.dll
%System%\.inf
%System%\REDATE.DAT
%System%\.dll
%System%\.nls
%System%\xmszs.dll
%System Root%\.exe
%System Root%\autorun.inf
d:\.exe
d:\autorun.inf
e:\.exe
e:\autorun.inf
f:\.exe
f:\autorun.inf
g:\.exe
g:\autorun.inf
h:\.exe
h:\autorun.inf
i:\.exe
i:\autorun.inf
j:\.exe
j:\autorun.inf
k:\.exe
k:\autorun.inf
l:\.exe
l:\autorun.inf
m:\.exe
m:\autorun.inf
n:\.exe
n:\autorun.inf
o:\.exe
o:\autorun.inf
p:\.exe
p:\autorun.inf
q:\.exe
q:\autorun.inf
r:\.exe
r:\autorun.inf
s:\.exe
s:\autorun.inf
t:\.exe
t:\autorun.inf
u:\.exe
u:\autorun.inf
v:\.exe
v:\autorun.inf
w:\.exe
w:\autorun.inf
x:\.exe
x:\autorun.inf
y:\.exe
y:\autorun.inf
z:\.exe
z:\autorun.inf
%System%\.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

Other Details

This Trojan deletes itself after execution.

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

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\Explorer\Advanced
- ShowSuperHidden = "0"

Step 3

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\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL
- From: CheckedValue = "1"
  To: CheckedValue = ""1""

In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess
- From: Start = "4"
  To: Start = ""2""

In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\helpsvc
- From: Start = "4"
  To: Start = ""2""

In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\wscsvc
- From: Start = "4"
  To: Start = ""2""

In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\wuauserv
- From: Start = "4"
  To: Start = ""2""

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL
- From: Type = "radio"
  To: Type = ""radio""

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\SuperHidden
- From: Type = "checkbox2"
  To: Type = ""checkbox""

To restore registry values this malware/grayware modified:

Open Registry Editor. To do this:
- On Windows 2000, XP, and Server 2003:
  Click Start>Run, type REGEDIT in the text box provided, and then press Enter.
- On Windows Vista and 7:
  Click the Start button, type REGEDIT in the Search input field then press Enter.
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows>CurrentVersion>Explorer>Advanced>Folder>Hidden>SHOWALL
In the right panel, locate the registry value:
CheckedValue = "1"
Right-click on the value name and choose Modify. Change the value data of this entry to:
CheckedValue = "1"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SYSTEM>ControlSet001>Services>SharedAccess
In the right panel, locate the registry value:
Start = "4"
Right-click on the value name and choose Modify. Change the value data of this entry to:
Start = "2"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SYSTEM>ControlSet001>Services>helpsvc
In the right panel, locate the registry value:
Start = "4"
Right-click on the value name and choose Modify. Change the value data of this entry to:
Start = "2"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SYSTEM>ControlSet001>Services>wscsvc
In the right panel, locate the registry value:
Start = "4"
Right-click on the value name and choose Modify. Change the value data of this entry to:
Start = "2"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SYSTEM>ControlSet001>Services>wuauserv
In the right panel, locate the registry value:
Start = "4"
Right-click on the value name and choose Modify. Change the value data of this entry to:
Start = "2"
Again In the right panel, locate the registry value:
Type = "radio"
Right-click on the value name and choose Modify. Change the value data of this entry to:
Type = "radio"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows>CurrentVersion>Explorer>Advanced>Folder>SuperHidden
In the right panel, locate the registry value:
Type = "checkbox2"
Right-click on the value name and choose Modify. Change the value data of this entry to:
Type = "checkbox"
Close Registry Editor.

Step 4

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%\IMES.dll
%System%\.inf
%System%\REDATE.DAT
%System%\.dll
%System%\.nls
%System%\xmszs.dll
%System Root%\.exe
%System Root%\autorun.inf
d:\.exe
d:\autorun.inf
e:\.exe
e:\autorun.inf
f:\.exe
f:\autorun.inf
g:\.exe
g:\autorun.inf
h:\.exe
h:\autorun.inf
i:\.exe
i:\autorun.inf
j:\.exe
j:\autorun.inf
k:\.exe
k:\autorun.inf
l:\.exe
l:\autorun.inf
m:\.exe
m:\autorun.inf
n:\.exe
n:\autorun.inf
o:\.exe
o:\autorun.inf
p:\.exe
p:\autorun.inf
q:\.exe
q:\autorun.inf
r:\.exe
r:\autorun.inf
s:\.exe
s:\autorun.inf
t:\.exe
t:\autorun.inf
u:\.exe
u:\autorun.inf
v:\.exe
v:\autorun.inf
w:\.exe
w:\autorun.inf
x:\.exe
x:\autorun.inf
y:\.exe
y:\autorun.inf
z:\.exe
z:\autorun.inf
%System%\.exe

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_AGENT.AJLA. 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.

%System Root%\autorun.inf
%System Root%\.exe
d:\autorun.inf
d:\.exe
e:\autorun.inf
e:\.exe
f:\autorun.inf
f:\.exe
g:\autorun.inf
g:\.exe
h:\autorun.inf
h:\.exe
i:\autorun.inf
i:\.exe
j:\autorun.inf
j:\.exe
k:\autorun.inf
k:\.exe
l:\autorun.inf
l:\.exe
m:\autorun.inf
m:\.exe
n:\autorun.inf
n:\.exe
o:\autorun.inf
o:\.exe
p:\autorun.inf
p:\.exe
q:\autorun.inf
q:\.exe
r:\autorun.inf
r:\.exe
s:\autorun.inf
s:\.exe
t:\autorun.inf
t:\.exe
u:\autorun.inf
u:\.exe
v:\autorun.inf
v:\.exe
w:\autorun.inf
w:\.exe
x:\autorun.inf
x:\.exe
y:\autorun.inf
y:\.exe
z:\autorun.inf
z:\.exe
%User Startup%\.exe
%Common Startup%\.exe
%System%\REDATE.DAT
%Temp%\.txt
%System%\.txt

Step 7

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\SYSTEM\ControlSet001\Control\SafeBoot\Minimal
- {4D36E967-E325-11CE-BFC1-08002BE10318}

In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\SafeBoot\Network
- {4D36E967-E325-11CE-BFC1-08002BE10318}

Did this description help? Tell us how we did.

OVERVIEW

TECHNICAL DETAILS

SOLUTION

Resources

Support

About Trend

Country Headquarters

TROJ_AGENT.AJLA

OVERVIEW

TECHNICAL DETAILS

SOLUTION

Resources

Support

About Trend

Country Headquarters

The Americas

Middle East & Africa

Europe

Asia & Pacific