Adware.Win32.Wajam.F

December 30, 2019
 PLATFORM:

Windows

 OVERALL RISK RATING:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 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:

386,992 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

28 Dec 2019

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 adds the following processes:

  • http://www.{BLOCKED}cai.com/?fb
  • "%Program Files%\Internet Explorer\IEXPLORE.EXE" SCODEF:2468 CREDAT:275457 /prefetch:2

It creates the following folders:

  • %Application Data%\Microsoft\Windows\IECompatCache
  • %Application Data%\Microsoft\Windows\DNTException
  • %AppDataLocal%\Microsoft\Internet Explorer\DomainSuggestions
  • %AppDataLocal%\Microsoft\Internet Explorer\Recovery\High\Active
  • %Application Data%\Microsoft\Windows\PrivacIE
  • %Application Data%\Microsoft\Windows\IECompatUACache

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Other System Modifications

This Adware deletes the following files:

  • %AppDataLocal%Low\Microsoft\Internet Explorer\Services\search_{0633EE93-D776-472f-A0FF-E1416B8B2E3A}.ico

(Note: %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Dropping Routine

This Adware drops the following files:

  • %AppDataLocal%\Microsoft\Internet Explorer\Recovery\High\Active\RecoveryStore.{B99D1B0C-CA75-11E9-B7B7-005056BC5B9B}.dat
  • %User Temp%\2064ulkpoeo
  • %AppDataLocal%\Microsoft\Internet Explorer\DomainSuggestions\en-US.6
  • %AppDataLocal%\Microsoft\Internet Explorer\MSIMGSIZ.DAT
  • %AppDataLocal%\Microsoft\Internet Explorer\imagestore\joppu72\imagestore.dat
  • %AppDataLocal%\Microsoft\Internet Explorer\Recovery\High\Active\{B99D1B0E-CA75-11E9-B7B7-005056BC5B9B}.dat
  • %AppDataLocal%\Microsoft\Internet Explorer\Recovery\High\Active\{C76C441A-CA75-11E9-B7B7-005056BC5B9B}.dat

(Note: %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Other Details

This Adware connects to the following possibly malicious URL:

  • http://repository.{BLOCKED}m.pl/wotrus-csca.cer
  • http://www.{BLOCKED}cai.com/?fb
  • http://www.{BLOCKED}cai.com/Public/css/base.css
  • http://www.{BLOCKED}cai.com/Public/css/common.css
  • http://www.{BLOCKED}cai.com/Public/css/index.css
  • http://www.{BLOCKED}cai.com/Public/css/animate.min.css
  • http://www.{BLOCKED}cai.com/Public/js/jquery.min.js
  • http://www.{BLOCKED}cai.com/Public/images/logo.png
  • http://www.{BLOCKED}cai.com/Public/js/common.js
  • http://www.{BLOCKED}cai.com/Public/js/index.js
  • http://www.{BLOCKED}cai.com/Public/js/seldn.js
  • http://www.{BLOCKED}cai.com/Public/js/CSUStatistics.js
  • http://www.{BLOCKED}cai.com/Public/images/icon_bnpic1.png
  • http://www.{BLOCKED}cai.com/Public/images/icon_nexp1.png
  • http://www.{BLOCKED}cai.com/Public/images/icon_nexp2.png
  • http://www.{BLOCKED}cai.com/Public/images/icon_nexp3.png
  • http://www.{BLOCKED}cai.com/Public/images/icon_nexp4.png
  • http://www.{BLOCKED}cai.com/uploads/161104/8-1611040Z350352.jpg
  • http://www.{BLOCKED}cai.com/uploads/161107/9-16110F911201B.jpg
  • http://www.{BLOCKED}cai.com/uploads/161107/9-16110FZGb44.jpg
  • http://www.{BLOCKED}cai.com/uploads/161107/9-16110F9142L56.jpg
  • http://www.{BLOCKED}cai.com/uploads/allimg/191125/31-1911251000410-L.jpg
  • http://www.{BLOCKED}cai.com/uploads/allimg/191122/31-1911221010230-L.jpg
  • http://www.{BLOCKED}cai.com/uploads/allimg/191121/31-191121100G70-L.jpg
  • http://www.{BLOCKED}cai.com/uploads/allimg/191120/31-191120101Q60-L.jpg
  • http://www.{BLOCKED}cai.com/uploads/allimg/191119/31-1911191013150-L.jpg
  • http://www.{BLOCKED}cai.com/uploads/allimg/191118/31-19111Q015340-L.jpg
  • http://www.{BLOCKED}cai.com/uploads/allimg/191115/31-191115100U40-L.jpg
  • http://www.{BLOCKED}cai.com/uploads/161107/9-16110F92T33K.jpg
  • http://www.{BLOCKED}cai.com/uploads/161107/9-16110F91531Z9.jpg
  • http://www.{BLOCKED}cai.com/Public/images/search.png
  • http://www.{BLOCKED}cai.com/uploads/160526/8-160526140319244.jpg
  • http://www.{BLOCKED}cai.com/uploads/160510/8-160510094959611.jpg
  • http://www.{BLOCKED}cai.com/uploads/160513/8-160513155U5210.jpg
  • http://www.{BLOCKED}cai.com/uploads/160607/8-16060G50320433.jpg
  • http://www.{BLOCKED}cai.com/Public/images/navbg.png
  • http://www.{BLOCKED}cai.com/Public/images/spec_new.png
  • http://www.{BLOCKED}cai.com/Public/images/banner_newbgn1.jpg
  • http://www.{BLOCKED}cai.com/Public/images/icon_adh1.png
  • http://www.{BLOCKED}cai.com/Public/images/icon_adh2.png
  • http://www.{BLOCKED}cai.com/Public/images/icon_adh3.png
  • http://www.{BLOCKED}cai.com/Public/images/icon_bntil1.png
  • http://www.{BLOCKED}cai.com/Public/images/icon_bntil2.png
  • http://push.{BLOCKED}ang.baidu.com/push.js
  • http://www.{BLOCKED}cai.com/Public/images/icon_bnline1.png
  • http://www.{BLOCKED}cai.com/Public/images/icon_bnt1.png
  • http://www.{BLOCKED}cai.com/Public/images/icon_bnt3.png
  • http://www.{BLOCKED}cai.com/Public/images/icon_bnt2.png
  • http://www.{BLOCKED}cai.com/Public/images/icon_bncbg1.png
  • http://www.{BLOCKED}cai.com/Public/images/icon_bncourbg1.png
  • http://www.{BLOCKED}cai.com/Public/images/icon6.png
  • http://www.{BLOCKED}cai.com/Public/images/vdeobg.png
  • http://www.{BLOCKED}cai.com/Public/images/icon1.png
  • http://www.{BLOCKED}cai.com/Public/images/icon2.png
  • http://www.{BLOCKED}cai.com/Public/images/pic2.png
  • http://www.{BLOCKED}cai.com/Public/images/pic3.png
  • http://www.{BLOCKED}cai.com/Public/images/icon_diamond.jpg
  • http://www.{BLOCKED}cai.com/Public/images/searchbg.png
  • http://www.{BLOCKED}cai.com/Public/images/input_bg.png
  • http://www.{BLOCKED}cai.com/Public/images/select_down.png
  • http://www.{BLOCKED}cai.com/Public/images/qq.png
  • http://www.{BLOCKED}cai.com/Public/images/n_bckf_ty.png
  • http://www.{BLOCKED}cai.com/Public/images/new_wx.png
  • http://www.{BLOCKED}cai.com/Public/images/back1.png
  • http://api.{BLOCKED}e.baidu.com/s.gif?l=http://www.bigbaicai.com/?fb
  • http://www.{BLOCKED}cai.com/Public/images/new_kfwx.png
  • http://www.{BLOCKED}cai.com/Public/images/tb1111.png
  • http://bdimg.{BLOCKED}e.baidu.com/static/api/js/{BLOCKED}e.js?v=89860593.js?cdnversion=435310
  • http://www.{BLOCKED}cai.com/uploads/160506/8-160506144151114.jpg
  • http://www.{BLOCKED}cai.com/uploads/160425/8-160425135611538.jpg
  • http://www.{BLOCKED}cai.com/uploads/190301/17-1Z30110104J02.jpg
  • http://www.{BLOCKED}cai.com/uploads/160930/8-1609301I352b1.jpg
  • http://www.{BLOCKED}cai.com/Public/images/foot1.png
  • http://www.{BLOCKED}cai.com/Public/images/foot2.png
  • http://bdimg.{BLOCKED}e.baidu.com/static/api/js/{BLOCKED}e/slide_api.js?v=ec14f516.js
  • http://bdimg.{BLOCKED}e.baidu.com/static/api/js/view/slide_view.js?v=9fecb657.js
  • http://bdimg.{BLOCKED}e.baidu.com/static/api/js/base/tangram.js?v=37768233.js
  • http://bdimg.{BLOCKED}e.baidu.com/static/api/js/{BLOCKED}e/api_base.js
  • http://bdimg.{BLOCKED}e.baidu.com/static/api/js/view/view_base.js
  • http://accwww26c1.{BLOCKED}f.com/sendacc.jsp?{random characters}
  • http://bdimg.{BLOCKED}e.baidu.com/static/api/css/slide_{BLOCKED}e.css?v=855af98e.css
  • http://bdimg.{BLOCKED}e.baidu.com/static/api/js/trans/logger.js?v=60603cb3.js
  • http://api.{BLOCKED}e.baidu.com/v.gif
  • http://bdimg.{BLOCKED}e.baidu.com/static/api/img/{BLOCKED}e/l6.gif?v=8759da8b.gif
  • http://nsclick.{BLOCKED}u.com/v.gif?{random characters}
  • http://www.{BLOCKED}cai.com/favicon.ico
  • http://go.{BLOCKED}oft.com
  • http://api.{BLOCKED}g.com
  • http://www.{BLOCKED}g.com
  • http://hm.{BLOCKED}u.com
  • http://tb.{BLOCKED}f.com
  • http://score.{BLOCKED}cai.com
  • http://www26c1.{BLOCKED}f.com
  • http://sqm.{BLOCKED}try.microsoft.com
  • http://ieonline.{BLOCKED}oft.com

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.850

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 2

Identify and terminate files detected as Adware.Win32.Wajam.F

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 3

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.
  • %AppDataLocal%\Microsoft\Internet Explorer\Recovery\High\Active\RecoveryStore.{B99D1B0C-CA75-11E9-B7B7-005056BC5B9B}.dat
  • %User Temp%\2064ulkpoeo
  • %AppDataLocal%\Microsoft\Internet Explorer\DomainSuggestions\en-US.6
  • %AppDataLocal%\Microsoft\Internet Explorer\MSIMGSIZ.DAT
  • %AppDataLocal%\Microsoft\Internet Explorer\imagestore\joppu72\imagestore.dat
  • %AppDataLocal%\Microsoft\Internet Explorer\Recovery\High\Active\{B99D1B0E-CA75-11E9-B7B7-005056BC5B9B}.dat
  • %AppDataLocal%\Microsoft\Internet Explorer\Recovery\High\Active\{C76C441A-CA75-11E9-B7B7-005056BC5B9B}.dat

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.
  • %Application Data%\Microsoft\Windows\IECompatCache
  • %Application Data%\Microsoft\Windows\DNTException
  • %AppDataLocal%\Microsoft\Internet Explorer\DomainSuggestions
  • %AppDataLocal%\Microsoft\Internet Explorer\Recovery\High\Active
  • %Application Data%\Microsoft\Windows\PrivacIE
  • %Application Data%\Microsoft\Windows\IECompatUACache

Step 5

Scan your computer with your Trend Micro product to delete files detected as Adware.Win32.Wajam.F. 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 the following Trend Micro Support pages 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.

  • %AppDataLocal%Low\Microsoft\Internet Explorer\Services\search_{0633EE93-D776-472f-A0FF-E1416B8B2E3A}.ico


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