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TROJ_AGENT_038142.TOMB

October 13, 2012
 ALIASES:

TrojanDropper:Win32/Agent.BAD (Microsoft); Trojan.ADH (Symantec); PAK:Molebox, Backdoor.Win32.Rbot.hyj (Kaspersky); Trojan-Dropper.Win32.Agent (Sunbelt); GenPack:Trojan.Keylogger.ADY (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:

2,091,389 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

23 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.

Installation

This Trojan creates the following folders:

  • %System Root%\DOCUME~1
  • %System Root%\DOCUME~1\ADMINI~1
  • %User Profile%\LOCALS~1
  • %User Temp%\nsa3.tmp
  • %Program Files%\Palringo
  • %System Root%\Documents and Settings\Administrator
  • %Start Menu%\Programs\Palringo

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %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.. %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.. %Program Files% is the default Program Files folder, usually C:\Program Files.. %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Profiles\{user name}\Start Menu on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu on Windows NT and C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003.)

Other System Modifications

This Trojan deletes the following files:

  • %User Temp%\nsv1.tmp
  • %User Temp%\nsa3.tmp
  • %Program Files%\Palringo\changelog.txt

(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.. %Program Files% is the default Program Files folder, usually C:\Program Files.)

It adds the following registry keys:

HKEY_CURRENT_USER\Software\Palringo

HKEY_CLASSES_ROOT\Palringo

HKEY_CLASSES_ROOT\Palringo\DefaultIcon

HKEY_CLASSES_ROOT\Palringo\shell\
open\command

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
Palringo

HKEY_LOCAL_MACHINE\Software\Microsoft\
Internet Explorer\Main\FeatureControl\
FEATURE_BROWSER_EMULATION

HKEY_CURRENT_USER\SOFTWARE\Parlingo\
Settings

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Palringo
DisplayName = "Palringo"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Palringo
Publisher = "Palringo Limited"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Palringo
UninstallString = "%Program Files%\Palringo\Uninstall.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Palringo
URLInfoAbout = "http://www.{BLOCKED}go.com"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Palringo
InstallLocation = "%Program Files%\Palringo"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Palringo
DisplayIcon = "%Program Files%\Palringo\palringo.exe,0"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Palringo
NoModify = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Palringo
NoRepair = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Internet Explorer\Main\FeatureControl\
FEATURE_BROWSER_EMULATION
palringo.exe = "2328"

HKEY_CURRENT_USER\Software\Parlingo\
Settings
ExecutablePath = "%Program Files%\Palringo\palringo.exe"

HKEY_CURRENT_USER\Software\Palringo
Start Menu Folder = "Palringo"

HKEY_CURRENT_USER\Software\Palringo
Installer Language = "1033"

HKEY_CURRENT_USER\Software\Parlingo\
Settings
Display/HTMLChatView = "0"

HKEY_CURRENT_USER\Software\Parlingo\
Settings
updates.versionid = "47"

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\mstrslolex.exe
  • %User Temp%\Palringo-Desktop32_v2_6_5.exe
  • %User Temp%\nsa2.tmp
  • %User Temp%\nsa3.tmp\System.dll
  • %User Temp%\nsa3.tmp\LangDLL.dll
  • %User Temp%\nsa3.tmp\StartMenu.dll
  • %User Temp%\nsa3.tmp\AccessControl.dll
  • %Program Files%\Palringo\Uninstall.exe
  • %Program Files%\Palringo\palringo.exe
  • %Program Files%\Palringo\libspeex.dll
  • %Program Files%\Palringo\0001.lang
  • %Program Files%\Palringo\0405.lang
  • %Program Files%\Palringo\0407.lang
  • %Program Files%\Palringo\040c.lang
  • %Program Files%\Palringo\0410.lang
  • %Program Files%\Palringo\0412.lang
  • %Program Files%\Palringo\0413.lang
  • %Program Files%\Palringo\0415.lang
  • %Program Files%\Palringo\0416.lang
  • %Program Files%\Palringo\041d.lang
  • %Program Files%\Palringo\041e.lang
  • %Program Files%\Palringo\041f.lang
  • %Program Files%\Palringo\0421.lang
  • %Program Files%\Palringo\0422.lang
  • %Program Files%\Palringo\0425.lang
  • %Program Files%\Palringo\0426.lang
  • %Program Files%\Palringo\0427.lang
  • %Program Files%\Palringo\0429.lang
  • %Program Files%\Palringo\042a.lang
  • %Program Files%\Palringo\0439.lang
  • %Program Files%\Palringo\043e.lang
  • %Program Files%\Palringo\043f.lang
  • %Program Files%\Palringo\0804.lang
  • %Program Files%\Palringo\0809.lang
  • %Program Files%\Palringo\0816.lang
  • %Program Files%\Palringo\0819.lang
  • %Program Files%\Palringo\0c0a.lang
  • %Program Files%\Palringo\contact.png
  • %Program Files%\Palringo\contact_android.png
  • %Program Files%\Palringo\contact_bot.png
  • %Program Files%\Palringo\contact_bridge.png
  • %Program Files%\Palringo\contact_ipad.png
  • %Program Files%\Palringo\contact_iphone.png
  • %Program Files%\Palringo\contact_mac.png
  • %Program Files%\Palringo\contact_mobile.png
  • %Program Files%\Palringo\contact_pc.png
  • %Program Files%\Palringo\emoticon_angel.png
  • %Program Files%\Palringo\emoticon_angry.png
  • %Program Files%\Palringo\emoticon_beer.png
  • %Program Files%\Palringo\emoticon_clown.png
  • %Program Files%\Palringo\emoticon_coffee.png
  • %Program Files%\Palringo\emoticon_cool.png
  • %Program Files%\Palringo\emoticon_crying.png
  • %Program Files%\Palringo\emoticon_devilish.png
  • %Program Files%\Palringo\emoticon_embarrassed.png
  • %Program Files%\Palringo\emoticon_food.png
  • %Program Files%\Palringo\emoticon_food_cake.png
  • %Program Files%\Palringo\emoticon_food_pizza.png
  • %Program Files%\Palringo\emoticon_gift.png
  • %Program Files%\Palringo\emoticon_glasses.png
  • %Program Files%\Palringo\emoticon_heart.png
  • %Program Files%\Palringo\emoticon_heart_broken.png
  • %Program Files%\Palringo\emoticon_hug_left.png
  • %Program Files%\Palringo\emoticon_hug_right.png
  • %Program Files%\Palringo\emoticon_in_love.png
  • %Program Files%\Palringo\emoticon_kiss.png
  • %Program Files%\Palringo\emoticon_laughing.png
  • %Program Files%\Palringo\emoticon_martini.png
  • %Program Files%\Palringo\emoticon_ninja.png
  • %Program Files%\Palringo\emoticon_opinion_agree.png
  • %Program Files%\Palringo\emoticon_opinion_disagree.png
  • %Program Files%\Palringo\emoticon_opinion_no.png
  • %Program Files%\Palringo\emoticon_opinion_okay.png
  • %Program Files%\Palringo\emoticon_pirate.png
  • %Program Files%\Palringo\emoticon_plain.png
  • %Program Files%\Palringo\emoticon_quiet.png
  • %Program Files%\Palringo\emoticon_raspberry.png
  • %Program Files%\Palringo\emoticon_rose.png
  • %Program Files%\Palringo\emoticon_rose_wilted.png
  • %Program Files%\Palringo\emoticon_sad.png
  • %Program Files%\Palringo\emoticon_sick.png
  • %Program Files%\Palringo\emoticon_sleeping.png
  • %Program Files%\Palringo\emoticon_smile.png
  • %Program Files%\Palringo\emoticon_smile_big.png
  • %Program Files%\Palringo\emoticon_smile_grin.png
  • %Program Files%\Palringo\emoticon_smirk.png
  • %Program Files%\Palringo\emoticon_star.png
  • %Program Files%\Palringo\emoticon_surprise.png
  • %Program Files%\Palringo\emoticon_uncertain.png
  • %Program Files%\Palringo\emoticon_wink.png
  • %Program Files%\Palringo\emoticon_worried.png
  • %Program Files%\Palringo\emoticon_yawn.png
  • %Program Files%\Palringo\group.png
  • %Program Files%\Palringo\overlay_away.png
  • %Program Files%\Palringo\overlay_busy.png
  • %Program Files%\Palringo\overlay_invisible.png
  • %Program Files%\Palringo\overlay_unreadmesg.png
  • %Program Files%\Palringo\premium.png
  • %Start Menu%\Programs\Palringo\Palringo.lnk
  • %Start Menu%\Programs\Palringo\Uninstall.lnk

(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.. %Program Files% is the default Program Files folder, usually C:\Program Files.. %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Profiles\{user name}\Start Menu on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu on Windows NT and C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003.)

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

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
    • Palringo
  • In HKEY_CLASSES_ROOT
    • Palringo
  • In HKEY_CLASSES_ROOT\Palringo
    • DefaultIcon
  • In HKEY_CLASSES_ROOT\Palringo\shell\open
    • command
  • In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall
    • Palringo
  • In HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\Main\FeatureControl
    • FEATURE_BROWSER_EMULATION
  • In HKEY_CURRENT_USER\SOFTWARE\Parlingo\
    • Settings

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Palringo
    • DisplayName = "Palringo"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Palringo
    • Publisher = "Palringo Limited"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Palringo
    • UninstallString = "%Program Files%\Palringo\Uninstall.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Palringo
    • URLInfoAbout = "http://www.{BLOCKED}go.com"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Palringo
    • InstallLocation = "%Program Files%\Palringo"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Palringo
    • DisplayIcon = "%Program Files%\Palringo\palringo.exe,0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Palringo
    • NoModify = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Palringo
    • NoRepair = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BROWSER_EMULATION
    • palringo.exe = "2328"
  • In HKEY_CURRENT_USER\Software\Parlingo\Settings
    • ExecutablePath = "%Program Files%\Palringo\palringo.exe"
  • In HKEY_CURRENT_USER\Software\Palringo
    • Start Menu Folder = "Palringo"
  • In HKEY_CURRENT_USER\Software\Palringo
    • Installer Language = "1033"
  • In HKEY_CURRENT_USER\Software\Parlingo\Settings
    • Display/HTMLChatView = "0"
  • In HKEY_CURRENT_USER\Software\Parlingo\Settings
    • updates.versionid = "47"

Step 4

Search and delete these files

[ Learn More ]
There may be some component 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%\mstrslolex.exe
  • %User Temp%\Palringo-Desktop32_v2_6_5.exe
  • %User Temp%\nsa2.tmp
  • %User Temp%\nsa3.tmp\System.dll
  • %User Temp%\nsa3.tmp\LangDLL.dll
  • %User Temp%\nsa3.tmp\StartMenu.dll
  • %User Temp%\nsa3.tmp\AccessControl.dll
  • %Program Files%\Palringo\Uninstall.exe
  • %Program Files%\Palringo\palringo.exe
  • %Program Files%\Palringo\libspeex.dll
  • %Program Files%\Palringo\0001.lang
  • %Program Files%\Palringo\0405.lang
  • %Program Files%\Palringo\0407.lang
  • %Program Files%\Palringo\040c.lang
  • %Program Files%\Palringo\0410.lang
  • %Program Files%\Palringo\0412.lang
  • %Program Files%\Palringo\0413.lang
  • %Program Files%\Palringo\0415.lang
  • %Program Files%\Palringo\0416.lang
  • %Program Files%\Palringo\041d.lang
  • %Program Files%\Palringo\041e.lang
  • %Program Files%\Palringo\041f.lang
  • %Program Files%\Palringo\0421.lang
  • %Program Files%\Palringo\0422.lang
  • %Program Files%\Palringo\0425.lang
  • %Program Files%\Palringo\0426.lang
  • %Program Files%\Palringo\0427.lang
  • %Program Files%\Palringo\0429.lang
  • %Program Files%\Palringo\042a.lang
  • %Program Files%\Palringo\0439.lang
  • %Program Files%\Palringo\043e.lang
  • %Program Files%\Palringo\043f.lang
  • %Program Files%\Palringo\0804.lang
  • %Program Files%\Palringo\0809.lang
  • %Program Files%\Palringo\0816.lang
  • %Program Files%\Palringo\0819.lang
  • %Program Files%\Palringo\0c0a.lang
  • %Program Files%\Palringo\contact.png
  • %Program Files%\Palringo\contact_android.png
  • %Program Files%\Palringo\contact_bot.png
  • %Program Files%\Palringo\contact_bridge.png
  • %Program Files%\Palringo\contact_ipad.png
  • %Program Files%\Palringo\contact_iphone.png
  • %Program Files%\Palringo\contact_mac.png
  • %Program Files%\Palringo\contact_mobile.png
  • %Program Files%\Palringo\contact_pc.png
  • %Program Files%\Palringo\emoticon_angel.png
  • %Program Files%\Palringo\emoticon_angry.png
  • %Program Files%\Palringo\emoticon_beer.png
  • %Program Files%\Palringo\emoticon_clown.png
  • %Program Files%\Palringo\emoticon_coffee.png
  • %Program Files%\Palringo\emoticon_cool.png
  • %Program Files%\Palringo\emoticon_crying.png
  • %Program Files%\Palringo\emoticon_devilish.png
  • %Program Files%\Palringo\emoticon_embarrassed.png
  • %Program Files%\Palringo\emoticon_food.png
  • %Program Files%\Palringo\emoticon_food_cake.png
  • %Program Files%\Palringo\emoticon_food_pizza.png
  • %Program Files%\Palringo\emoticon_gift.png
  • %Program Files%\Palringo\emoticon_glasses.png
  • %Program Files%\Palringo\emoticon_heart.png
  • %Program Files%\Palringo\emoticon_heart_broken.png
  • %Program Files%\Palringo\emoticon_hug_left.png
  • %Program Files%\Palringo\emoticon_hug_right.png
  • %Program Files%\Palringo\emoticon_in_love.png
  • %Program Files%\Palringo\emoticon_kiss.png
  • %Program Files%\Palringo\emoticon_laughing.png
  • %Program Files%\Palringo\emoticon_martini.png
  • %Program Files%\Palringo\emoticon_ninja.png
  • %Program Files%\Palringo\emoticon_opinion_agree.png
  • %Program Files%\Palringo\emoticon_opinion_disagree.png
  • %Program Files%\Palringo\emoticon_opinion_no.png
  • %Program Files%\Palringo\emoticon_opinion_okay.png
  • %Program Files%\Palringo\emoticon_pirate.png
  • %Program Files%\Palringo\emoticon_plain.png
  • %Program Files%\Palringo\emoticon_quiet.png
  • %Program Files%\Palringo\emoticon_raspberry.png
  • %Program Files%\Palringo\emoticon_rose.png
  • %Program Files%\Palringo\emoticon_rose_wilted.png
  • %Program Files%\Palringo\emoticon_sad.png
  • %Program Files%\Palringo\emoticon_sick.png
  • %Program Files%\Palringo\emoticon_sleeping.png
  • %Program Files%\Palringo\emoticon_smile.png
  • %Program Files%\Palringo\emoticon_smile_big.png
  • %Program Files%\Palringo\emoticon_smile_grin.png
  • %Program Files%\Palringo\emoticon_smirk.png
  • %Program Files%\Palringo\emoticon_star.png
  • %Program Files%\Palringo\emoticon_surprise.png
  • %Program Files%\Palringo\emoticon_uncertain.png
  • %Program Files%\Palringo\emoticon_wink.png
  • %Program Files%\Palringo\emoticon_worried.png
  • %Program Files%\Palringo\emoticon_yawn.png
  • %Program Files%\Palringo\group.png
  • %Program Files%\Palringo\overlay_away.png
  • %Program Files%\Palringo\overlay_busy.png
  • %Program Files%\Palringo\overlay_invisible.png
  • %Program Files%\Palringo\overlay_unreadmesg.png
  • %Program Files%\Palringo\premium.png
  • %Start Menu%\Programs\Palringo\Palringo.lnk
  • %Start Menu%\Programs\Palringo\Uninstall.lnk

Step 5

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%\DOCUME~1
  • %System Root%\DOCUME~1\ADMINI~1
  • %User Profile%\LOCALS~1
  • %User Temp%\nsa3.tmp
  • %Program Files%\Palringo
  • %System Root%\Documents and Settings\Administrator
  • %Start Menu%\Programs\Palringo

Step 6

Scan your computer with your Trend Micro product to delete files detected as TROJ_AGENT_038142.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 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.

  • %User Temp%\nsv1.tmp
  • %User Temp%\nsa3.tmp
  • %Program Files%\Palringo\changelog.txt


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