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ADW_DAUGAVA.GA

October 02, 2015
 Analysis by: Pearl Charlaine Espejo
 ALIASES:

ADWARE/Dagava.L.2 (Avira); not-a-virus:AdWare.Win32.Dagava.c (Kaspersky); Win32.Trojan.Falsesign.Duy (Tencent); Riskware/BitCocktail (Fortinet)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Adware

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This adware 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:

2,989,568 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

27 Aug 2015

Arrival Details

This adware 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 adware drops the following files:

  • %User Temp%\is-{random characters}.tmp\_isetup\_shfoldr.dll
  • %User Temp%\is-{random characters}.tmp\Eqxlolnp.dll
  • %User Temp%\is-{random characters}.tmp\gcpum.dll
  • %User Temp%\is-{random characters}.tmp\InoDll.dll
  • %User Temp%\is-{random characters}.tmp\license.txt
  • %User Temp%\is-{random characters}.tmp\wlist.js
  • %User Temp%\is-{random characters}.tmp\config.js
  • %AppDataLocalLow%\{D2020D47-707D-4E26-B4D9-739C4F4C2E9A}\{FBC0652C-7B29-4FB6-8ADA-91F54B267AD4}\1.5\wlist.js
  • %AppDataLocalLow%\{D2020D47-707D-4E26-B4D9-739C4F4C2E9A}\{FBC0652C-7B29-4FB6-8ADA-91F54B267AD4}\1.5\config.js
  • %AppDataLocalLow%\{D2020D47-707D-4E26-B4D9-739C4F4C2E9A}\{FBC0652C-7B29-4FB6-8ADA-91F54B267AD4}\1.5\tree.js
  • %AppDataLocalLow%\Company\Product\1.0\localStorageIE.txt
  • %AppDataLocalLow%\Company\Product\1.0\localStorageIE_backup.txt
  • %Application Data%\Mozilla\Firefox\Profiles\dxxbjsgn.default\user.js
  • %Program Files%\daugava\unins000.dat
  • %Program Files%\daugava\unins000.exe
  • %Program Files%\daugava\Upbgbeie.exe
  • %Program Files%\daugava\Tuugvuiog.dll
  • %Program Files%\daugava\Tuugvuiog64.dll
  • %Program Files%\daugava\Ejemidvlf.exe
  • %Program Files%\daugava\Ejemidvlf.exe
  • %Program Files%\daugava\Ejemidvlf64.exe
  • %Program Files%\daugava\Wqzaon.dll
  • %Program Files%\daugava\Wqzaon64.dll
  • %Program Files%\daugava\Dpfvedc.dll
  • %Program Files%\daugava\Dpfvedc64.dll
  • %Program Files%\daugava\Esrqqdf.dll
  • %Program Files%\daugava\Esrqqdf64.dll
  • %Program Files%\daugava\Irosioe.bat
  • %Program Files%\daugava\csrcc.exe
  • %Program Files%\daugava\nfregdrv32.exe
  • %Program Files%\daugava\Weekfqwb.exe
  • %Program Files%\daugava\Eqxlolnp.dll
  • %Program Files%\daugava\gcpum.dll
  • %Program Files%\daugava\tree.js
  • %Program Files%\daugava\resources\LocalScript.js
  • %Program Files%\daugava\libraries\DataExchangeScript.js
  • %Program Files%\daugava\Firefox\chrome.manifest
  • %Program Files%\daugava\Firefox\icon.png
  • %Program Files%\daugava\Firefox\install.rdf
  • %Program Files%\daugava\Firefox\{f179b4aa-3249-4e0e-a45a-8519d6bcd424}.xpi
  • %Program Files%\daugava\Firefox\chrome\content\main.js
  • %Program Files%\daugava\Firefox\chrome\content\main.xul
  • %Program Files%\daugava\Firefox\chrome\content\libraries\DataExchangeScript.js
  • %Program Files%\daugava\Firefox\chrome\content\resources\LocalScript.js
  • %Program Files%\daugava\Firefox\chrome\locale\en-US\overlay.dtd
  • %Program Files%\daugava\Firefox\chrome\skin\overlay.css
  • %Program Files%\daugava\Firefox\defaults\preferences\defaults.js
  • %System%\drivers\cherimoya.sys

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %AppDataLocalLow% is the protected mode folder of Internet Explorer, where it usually is C:\Users\{user name}\AppData\LocalLow on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

It creates the following folders:

  • %User Temp%\is-{random characters}.tmp
  • %User Temp%\is-{random characters}.tmp\_isetup
  • %Program Files%\daugava
  • %Program Files%\daugava\Firefox
  • %Program Files%\daugava\resources
  • %Program Files%\daugava\libraries
  • %AppDataLocalLow%\{D2020D47-707D-4E26-B4D9-739C4F4C2E9A}\{FBC0652C-7B29-4FB6-8ADA-91F54B267AD4}

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.. %AppDataLocalLow% is the protected mode folder of Internet Explorer, where it usually is C:\Users\{user name}\AppData\LocalLow on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Autostart Technique

This adware adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
daugava = "%Program Files%\daugava\Ejemidvlf.exe"

It drops the following files:

  • %System%\Tasks\Cawlez

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

Other System Modifications

This adware adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\daugava

HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\
daugava

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{f179b4aa-3249-4e0e-a45a-8519d6bcd424}_is1

HKEY_CURRENT_USER\Software\{39e26a25-15e4-4038-b6af-f291dc7ffdcc}

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\daugava
installer_name = "daugava__.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\daugava
install_time = "{installation date}"

HKEY_LOCAL_MACHINE\SOFTWARE\daugava
channel_id = ""

HKEY_LOCAL_MACHINE\SOFTWARE\daugava
version = "2.0.0.701"

HKEY_LOCAL_MACHINE\SOFTWARE\daugava
product_version = "2.0.0.701"

HKEY_LOCAL_MACHINE\SOFTWARE\daugava
ToolbarID = "{ID}"

HKEY_LOCAL_MACHINE\SOFTWARE\daugava
product_name = "daugava"

HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\
daugava
installer_name = "daugava__.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\
daugava
install_time = "{installation date}"

HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\
daugava
channel_id = ""

HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\
daugava
version = "2.0.0.701"

HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\
daugava
product_version = "2.0.0.701"

HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\
daugava
ToolbarID = "{ID}"

HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\
daugava
product_name = "daugava"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{f179b4aa-3249-4e0e-a45a-8519d6bcd424}_is1
Inno Setup: Setup Version = "5.5.3 (u)"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{f179b4aa-3249-4e0e-a45a-8519d6bcd424}_is1
Inno Setup: App Path = "%Program Files%\daugava"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{f179b4aa-3249-4e0e-a45a-8519d6bcd424}_is1
Inno Setup: Icon Group = "daugava"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{f179b4aa-3249-4e0e-a45a-8519d6bcd424}_is1
Inno Setup: User = "{username}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{f179b4aa-3249-4e0e-a45a-8519d6bcd424}_is1
Inno Setup: Language = "english"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{f179b4aa-3249-4e0e-a45a-8519d6bcd424}_is1
DisplayName = "daugava 2.0.0.701"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{f179b4aa-3249-4e0e-a45a-8519d6bcd424}_is1
UninstallString = "%Program Files%\daugava\unins000.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{f179b4aa-3249-4e0e-a45a-8519d6bcd424}_is1
QuietUninstallString = ""%Program Files%\daugava\unins000.exe" /SILENT"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{f179b4aa-3249-4e0e-a45a-8519d6bcd424}_is1
QuietUninstallString = ""%Program Files%\daugava\unins000.exe" /SILENT"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{f179b4aa-3249-4e0e-a45a-8519d6bcd424}_is1
Publisher = "daugava"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{f179b4aa-3249-4e0e-a45a-8519d6bcd424}_is1
URLInfoAbout = "INJ_EXTENSION_PUBLISHER_URL"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{f179b4aa-3249-4e0e-a45a-8519d6bcd424}_is1
HelpLink = "INJ_EXTENSION_PUBLISHER_URL"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{f179b4aa-3249-4e0e-a45a-8519d6bcd424}_is1
URLUpdateInfo = "INJ_EXTENSION_PUBLISHER_URL"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{f179b4aa-3249-4e0e-a45a-8519d6bcd424}_is1
NoModify = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{f179b4aa-3249-4e0e-a45a-8519d6bcd424}_is1
NoRepair = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{f179b4aa-3249-4e0e-a45a-8519d6bcd424}_is1
InstallDate = "{installation date}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{f179b4aa-3249-4e0e-a45a-8519d6bcd424}_is1
MajorVersion = "2"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{f179b4aa-3249-4e0e-a45a-8519d6bcd424}_is1
MinorVersion = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{f179b4aa-3249-4e0e-a45a-8519d6bcd424}_is1
EstimatedSize = "7995"

HKEY_CURRENT_USER\Software\{39e26a25-15e4-4038-b6af-f291dc7ffdcc}
Name = "%Program Files%\daugava\Ejemidvlf.exe"

  SOLUTION

Minimum Scan Engine:

9.750

SSAPI PATTERN File:

1.661.00

SSAPI PATTERN Date:

23 Sep 2015

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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Restart in Safe Mode

[ Learn More ]

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
    • daugava = "%Program Files%\daugava\Ejemidvlf.exe"

Step 5

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
    • daugava
  • In HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node
    • daugava
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
    • {f179b4aa-3249-4e0e-a45a-8519d6bcd424}_is1
  • In HKEY_CURRENT_USER\Software
    • {39e26a25-15e4-4038-b6af-f291dc7ffdcc}

Step 6

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.
  • %AppDataLocalLow%\Company
  • %User Temp%\is-{random characters}.tmp
  • %Program Files%\daugava
  • %AppDataLocalLow%\%AppDataLocalLow%\{D2020D47-707D-4E26-B4D9-739C4F4C2E9A}\{FBC0652C-7B29-4FB6-8ADA-91F54B267AD4}

Step 7

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.
  • %System%\drivers\cherimoya.sys
  • %System%\Tasks\Cawlez

Step 8

Restart in normal mode and scan your computer with your Trend Micro product for files detected as ADW_DAUGAVA.GA. 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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