Trojan.Encoder.38235

Technical Information

To ensure autorun and distribution

Modifies the following registry keys

[HKCU\Software\Microsoft\Windows\CurrentVersion\Control Panel\CPLs] '<File name>' = '%TEMP%\<File name>.cpl'
[HKCU\Software\Microsoft\Windows\CurrentVersion\RunOnce] '' = '%TEMP%\Adobe\'

Creates or modifies the following files

<SYSTEM32>\tasks\<File name>

Malicious functions

To complicate detection of its presence in the operating system,

blocks execution of the following system utilities:

Windows Task Manager (Taskmgr)

Modifies file system

Creates the following files

%TEMP%\<File name>.cpl
%ALLUSERSPROFILE%\package cache\{f1b0fb3a-e0ea-47a6-9383-3650655403b0}v14.16.27024\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{f65db027-aff3-4070-886a-0d87064aabb1}\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{f8cfeb22-a2e7-3971-9eda-4b11edefc185}v12.0.21005\packages\vcruntimeadditional_x86\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{f8cfeb22-a2e7-3971-9eda-4b11edefc185}v12.0.21005\packages\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{f8cfeb22-a2e7-3971-9eda-4b11edefc185}v12.0.21005\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{fd9b6070-d13e-45dc-819b-41806bf45b6b}\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\readme_4706602.txt
%ALLUSERSPROFILE%\sun\java\java update\readme_4706602.txt
%ALLUSERSPROFILE%\sun\java\readme_4706602.txt
%ALLUSERSPROFILE%\sun\readme_4706602.txt
C:\users\default\appdata\readme_4706602.txt
C:\users\default\desktop\readme_4706602.txt
C:\users\default\documents\readme_4706602.txt
C:\users\default\downloads\readme_4706602.txt
C:\users\default\favorites\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{f1b0fb3a-e0ea-47a6-9383-3650655403b0}v14.16.27024\packages\readme_4706602.txt
C:\users\default\links\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{f1b0fb3a-e0ea-47a6-9383-3650655403b0}v14.16.27024\packages\vcruntimeminimum_amd64\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{ec9807de-b577-47b1-a024-0251805acf24}v14.29.30133\packages\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{a749d8e6-b613-3be3-8f5f-045c84eba29b}v12.0.21005\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{b175520c-86a2-35a7-8619-86dc379688b9}v11.0.61030\packages\vcruntimeadditional_x86\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{b175520c-86a2-35a7-8619-86dc379688b9}v11.0.61030\packages\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{b175520c-86a2-35a7-8619-86dc379688b9}v11.0.61030\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{bd95a8cd-1d9f-35ad-981a-3e7925026ebb}v11.0.61030\packages\vcruntimeminimum_x86\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{bd95a8cd-1d9f-35ad-981a-3e7925026ebb}v11.0.61030\packages\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{bd95a8cd-1d9f-35ad-981a-3e7925026ebb}v11.0.61030\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{ca67548a-5ebe-413a-b50c-4b9ceb6d66c6}\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{cf2bea3c-26ea-32f8-aa9b-331f7e34ba97}v11.0.61030\packages\vcruntimeminimum_amd64\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{cf2bea3c-26ea-32f8-aa9b-331f7e34ba97}v11.0.61030\packages\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{cf2bea3c-26ea-32f8-aa9b-331f7e34ba97}v11.0.61030\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{e699e009-1c3c-4e50-9b57-2b39f0954c7f}v14.29.30133\packages\vcruntimeadditional_amd64\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{e699e009-1c3c-4e50-9b57-2b39f0954c7f}v14.29.30133\packages\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{e699e009-1c3c-4e50-9b57-2b39f0954c7f}v14.29.30133\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{ec9807de-b577-47b1-a024-0251805acf24}v14.29.30133\packages\vcruntimeminimum_x86\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{ec9807de-b577-47b1-a024-0251805acf24}v14.29.30133\readme_4706602.txt
C:\users\default\music\readme_4706602.txt
C:\users\default\pictures\readme_4706602.txt
C:\users\default\saved games\readme_4706602.txt
%HOMEPATH%\favorites\links\readme_4706602.txt
%HOMEPATH%\favorites\links for united states\readme_4706602.txt
%HOMEPATH%\favorites\microsoft websites\readme_4706602.txt
%HOMEPATH%\favorites\msn websites\readme_4706602.txt
%HOMEPATH%\favorites\windows live\readme_4706602.txt
%HOMEPATH%\favorites\readme_4706602.txt
%WINDIR%\readme_4706602.txt
%HOMEPATH%\links\readme_4706602.txt
%HOMEPATH%\pictures\readme_4706602.txt
%HOMEPATH%\saved games\readme_4706602.txt
%HOMEPATH%\searches\readme_4706602.txt
%HOMEPATH%\videos\readme_4706602.txt
%HOMEPATH%\readme_4706602.txt
C:\users\readme_4706602.txt
%HOMEPATH%\documents\readme_4706602.txt
%HOMEPATH%\downloads\readme_4706602.txt
%HOMEPATH%\desktop\readme_4706602.txt
%HOMEPATH%\contacts\readme_4706602.txt
%HOMEPATH%\appdata\readme_4706602.txt
C:\users\default\readme_4706602.txt
C:\users\public\desktop\readme_4706602.txt
C:\users\public\documents\readme_4706602.txt
C:\users\public\downloads\readme_4706602.txt
C:\users\public\favorites\readme_4706602.txt
C:\users\public\libraries\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{a749d8e6-b613-3be3-8f5f-045c84eba29b}v12.0.21005\packages\readme_4706602.txt
C:\users\public\music\readme_4706602.txt
C:\users\public\music\sample music\readme_4706602.txt
C:\users\public\pictures\readme_4706602.txt
C:\users\public\recorded tv\sample media\readme_4706602.txt
C:\users\public\recorded tv\readme_4706602.txt
C:\users\public\videos\sample videos\readme_4706602.txt
C:\users\public\videos\readme_4706602.txt
C:\users\public\readme_4706602.txt
C:\users\default\videos\readme_4706602.txt
C:\users\public\pictures\sample pictures\readme_4706602.txt
%HOMEPATH%\music\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{a749d8e6-b613-3be3-8f5f-045c84eba29b}v12.0.21005\packages\vcruntimeminimum_amd64\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{6cd9e9ed-906d-4196-8dc3-f987d2f6615f}v14.29.30133\packages\vcruntimeminimum_amd64\readme_4706602.txt
C:\msocache\all users\{90140000-0115-0409-1000-0000000ff1ce}-c\readme_4706602.txt
C:\msocache\all users\{90140000-0117-0409-1000-0000000ff1ce}-c\access.en-us\readme_4706602.txt
C:\msocache\all users\{90140000-0117-0409-1000-0000000ff1ce}-c\readme_4706602.txt
C:\msocache\all users\readme_4706602.txt
C:\msocache\readme_4706602.txt
C:\perflogs\admin\readme_4706602.txt
C:\perflogs\readme_4706602.txt
%ProgramFiles%\readme_4706602.txt
%ProgramFiles(x86)%\readme_4706602.txt
%ALLUSERSPROFILE%\readme_4706602.txt
C:\recovery\fc7d0508-3f8d-11ed-bf82-c9aa0b5639b5\readme_4706602.txt
C:\recovery\readme_4706602.txt
<Current directory>\readme_4706602.txt
%ALLUSERSPROFILE%\adobe\arm\s\readme_4706602.txt
%ALLUSERSPROFILE%\adobe\arm\{291aa914-a987-4ce9-bd63-ac0a92d435e5}\readme_4706602.txt
C:\msocache\all users\{90140000-0115-0409-1000-0000000ff1ce}-c\1033\readme_4706602.txt
%ALLUSERSPROFILE%\adobe\arm\readme_4706602.txt
C:\msocache\all users\{90140000-00ba-0409-1000-0000000ff1ce}-c\readme_4706602.txt
C:\msocache\all users\{90140000-0044-0409-1000-0000000ff1ce}-c\readme_4706602.txt
%TEMP%\<File name>.lnk
%TEMP%\4706602_dat.log
C:\$recycle.bin\readme_4706602.txt
C:\kms\readme_4706602.txt
C:\msocache\all users\{90140000-0011-0000-1000-0000000ff1ce}-c\readme_4706602.txt
C:\msocache\all users\{90140000-0016-0409-1000-0000000ff1ce}-c\readme_4706602.txt
C:\msocache\all users\{90140000-0018-0409-1000-0000000ff1ce}-c\readme_4706602.txt
C:\msocache\all users\{90140000-0019-0409-1000-0000000ff1ce}-c\readme_4706602.txt
C:\msocache\all users\{90140000-001a-0409-1000-0000000ff1ce}-c\readme_4706602.txt
C:\msocache\all users\{90140000-001b-0409-1000-0000000ff1ce}-c\readme_4706602.txt
C:\msocache\all users\{90140000-002c-0409-1000-0000000ff1ce}-c\proof.en\readme_4706602.txt
C:\msocache\all users\{90140000-002c-0409-1000-0000000ff1ce}-c\proof.es\readme_4706602.txt
C:\msocache\all users\{90140000-002c-0409-1000-0000000ff1ce}-c\proof.fr\readme_4706602.txt
C:\msocache\all users\{90140000-002c-0409-1000-0000000ff1ce}-c\readme_4706602.txt
C:\msocache\all users\{90140000-0043-0409-1000-0000000ff1ce}-c\readme_4706602.txt
C:\msocache\all users\{90140000-00a1-0409-1000-0000000ff1ce}-c\readme_4706602.txt
%ALLUSERSPROFILE%\adobe\setup\{ac76ba86-7ad7-1033-7b44-ac0f074e4100}\readme_4706602.txt
%ALLUSERSPROFILE%\adobe\setup\readme_4706602.txt
%ALLUSERSPROFILE%\adobe\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{37b8f9c7-03fb-3253-8781-2517c99d7c00}v11.0.61030\packages\vcruntimeadditional_amd64\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{37b8f9c7-03fb-3253-8781-2517c99d7c00}v11.0.61030\packages\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{37b8f9c7-03fb-3253-8781-2517c99d7c00}v11.0.61030\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{38b2c744-ad08-4d5b-91a2-3fb6f739ff3e}\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{42667d2e-b054-46c1-9d46-2ee1332c14c1}v14.29.30133\packages\vcruntimeadditional_x86\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{42667d2e-b054-46c1-9d46-2ee1332c14c1}v14.29.30133\packages\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{9d29fc96-9eee-4253-943f-96b3bbfdd0b6}v14.16.27024\packages\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{42667d2e-b054-46c1-9d46-2ee1332c14c1}v14.29.30133\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{6cd9e9ed-906d-4196-8dc3-f987d2f6615f}v14.29.30133\packages\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{6cd9e9ed-906d-4196-8dc3-f987d2f6615f}v14.29.30133\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{929fbd26-9020-399b-9a7a-751d61f0b942}v12.0.21005\packages\vcruntimeadditional_amd64\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{929fbd26-9020-399b-9a7a-751d61f0b942}v12.0.21005\packages\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{929fbd26-9020-399b-9a7a-751d61f0b942}v12.0.21005\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{9d29fc96-9eee-4253-943f-96b3bbfdd0b6}v14.16.27024\packages\vcruntimeadditional_amd64\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{295d1583-fdb9-414b-a4c8-da539362a26b}\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{33d1fd90-4274-48a1-9bc1-97e33d9c2d6f}\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{13a4ee12-23ea-3371-91ee-efb36ddfff3e}v12.0.21005\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{13a4ee12-23ea-3371-91ee-efb36ddfff3e}v12.0.21005\packages\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{13a4ee12-23ea-3371-91ee-efb36ddfff3e}v12.0.21005\packages\vcruntimeminimum_x86\readme_4706602.txt
%ALLUSERSPROFILE%\microsoft help\readme_4706602.txt
%ALLUSERSPROFILE%\mozilla\updates\308046b0af4a39cb\readme_4706602.txt
%ALLUSERSPROFILE%\mozilla\updates\d78bf5dd33499ec2\readme_4706602.txt
%ALLUSERSPROFILE%\mozilla\updates\e7cf176e110c211b\readme_4706602.txt
%ALLUSERSPROFILE%\mozilla\updates\readme_4706602.txt
%ALLUSERSPROFILE%\mozilla\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{9d29fc96-9eee-4253-943f-96b3bbfdd0b6}v14.16.27024\readme_4706602.txt
%ALLUSERSPROFILE%\oracle\java\javapath\readme_4706602.txt
%ALLUSERSPROFILE%\oracle\java\installcache_x64\readme_4706602.txt
%ALLUSERSPROFILE%\oracle\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\42d5bec7ddfbd49e76467529cbc2868987bf8460\packages\patch\x64\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\42d5bec7ddfbd49e76467529cbc2868987bf8460\packages\patch\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\42d5bec7ddfbd49e76467529cbc2868987bf8460\packages\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\42d5bec7ddfbd49e76467529cbc2868987bf8460\readme_4706602.txt
%ALLUSERSPROFILE%\package cache\{050d4fc8-5d48-4b8f-8972-47c82c46020f}\readme_4706602.txt
%ALLUSERSPROFILE%\microsoft\readme_4706602.txt
%ALLUSERSPROFILE%\oracle\java\readme_4706602.txt
D:\$recycle.bin\readme_4706602.txt

Sets the 'hidden' attribute to the following files

%TEMP%\<File name>.cpl
%TEMP%\<File name>.lnk

Modifies the following files

C:\kms\kms_vl_all_aio.cmd
C:\msocache\all users\{90140000-001b-0409-1000-0000000ff1ce}-c\setup.xml
C:\msocache\all users\{90140000-001a-0409-1000-0000000ff1ce}-c\setup.xml
C:\msocache\all users\{90140000-001a-0409-1000-0000000ff1ce}-c\outlookmui.xml
C:\msocache\all users\{90140000-001a-0409-1000-0000000ff1ce}-c\outlookmui.msi
C:\msocache\all users\{90140000-001a-0409-1000-0000000ff1ce}-c\outlklr.cab
C:\msocache\all users\{90140000-0019-0409-1000-0000000ff1ce}-c\setup.xml
C:\msocache\all users\{90140000-0019-0409-1000-0000000ff1ce}-c\publr.cab
C:\msocache\all users\{90140000-0019-0409-1000-0000000ff1ce}-c\publishermui.xml
C:\msocache\all users\{90140000-0019-0409-1000-0000000ff1ce}-c\publishermui.msi
C:\msocache\all users\{90140000-0018-0409-1000-0000000ff1ce}-c\setup.xml
C:\msocache\all users\{90140000-0018-0409-1000-0000000ff1ce}-c\pptlr.cab
C:\msocache\all users\{90140000-0018-0409-1000-0000000ff1ce}-c\powerpointmui.xml
C:\msocache\all users\{90140000-0018-0409-1000-0000000ff1ce}-c\powerpointmui.msi
C:\msocache\all users\{90140000-0016-0409-1000-0000000ff1ce}-c\setup.xml
C:\msocache\all users\{90140000-0016-0409-1000-0000000ff1ce}-c\excelmui.xml
C:\msocache\all users\{90140000-0016-0409-1000-0000000ff1ce}-c\excelmui.msi
C:\msocache\all users\{90140000-0016-0409-1000-0000000ff1ce}-c\excellr.cab
C:\msocache\all users\{90140000-0011-0000-1000-0000000ff1ce}-c\setup.xml
C:\msocache\all users\{90140000-0011-0000-1000-0000000ff1ce}-c\propsww2.cab
C:\msocache\all users\{90140000-0011-0000-1000-0000000ff1ce}-c\propsww.cab
C:\msocache\all users\{90140000-0011-0000-1000-0000000ff1ce}-c\proplusww.xml
C:\msocache\all users\{90140000-0011-0000-1000-0000000ff1ce}-c\proplusww.msi
C:\msocache\all users\{90140000-0011-0000-1000-0000000ff1ce}-c\pkeyconfig-office.xrm-ms
C:\msocache\all users\{90140000-0011-0000-1000-0000000ff1ce}-c\owow32ww.cab
C:\msocache\all users\{90140000-0011-0000-1000-0000000ff1ce}-c\office32ww.xml
C:\msocache\all users\{90140000-0011-0000-1000-0000000ff1ce}-c\office32ww.msi
C:\kms\kms_vl_all_aio_debug.log
C:\msocache\all users\{90140000-001b-0409-1000-0000000ff1ce}-c\wordlr.cab
C:\msocache\all users\{90140000-001b-0409-1000-0000000ff1ce}-c\wordmui.msi

Modifies multiple files.

Moves itself

from <PATH_SAMPLE>.cpl to <Current directory>\dhvwywzucy5jcgw=

Modifies user data files (Trojan.Encoder).

Miscellaneous

Creates and executes the following

'<SYSTEM32>\schtasks.exe' /Create /F /TN "<File name>" /SC ONLOGON /TR "mshta.exe vbscript:Execute(\"on error resume next:CreateObject(\"\"Wscript.Shell\"\").Run \"\"\"\"\"\"%TEMP%\<File name>.lnk\"\"\"\"\"\",0:close\""...' (with hidden window)
'<SYSTEM32>\schtasks.exe' /RUN /TN "<File name>"' (with hidden window)
'<SYSTEM32>\mshta.exe' vbscript:Execute("on error resume next:CreateObject(""Wscript.Shell"").Run """"""%TEMP%\<File name>.lnk"""""",0:close")' (with hidden window)

Executes the following

'<SYSTEM32>\schtasks.exe' /Create /F /TN "<File name>" /SC ONLOGON /TR "mshta.exe vbscript:Execute(\"on error resume next:CreateObject(\"\"Wscript.Shell\"\").Run \"\"\"\"\"\"%TEMP%\<File name>.lnk\"\"\"\"\"\",0:close\""...
'<SYSTEM32>\schtasks.exe' /RUN /TN "<File name>"
'<SYSTEM32>\taskeng.exe' {4DE469CD-BBCB-4711-AD22-B0000772E7C5} S-1-5-21-1238866942-1249195528-555854008-1000:mvrghvqqqzj\user:Interactive:[1]
'<SYSTEM32>\mshta.exe' vbscript:Execute("on error resume next:CreateObject(""Wscript.Shell"").Run """"""%TEMP%\<File name>.lnk"""""",0:close")

Technologies

Terminology

Training and education

Myths

Technical Information

Curing recommendations

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