Trojan.MulDrop22.37887

Technical Information

Malicious functions

To complicate detection of its presence in the operating system,

deletes volume shadow copies.

Modifies file system

Creates the following files

<Current directory>\key.txt
%ALLUSERSPROFILE%\microsoft\uev\templates\key.txt
%ALLUSERSPROFILE%\microsoft\uev\key.txt
%ALLUSERSPROFILE%\microsoft\user account pictures\key.txt
%ALLUSERSPROFILE%\microsoft\vault\ac658cb4-9126-49bd-b877-31eedab3f204\key.txt
%ALLUSERSPROFILE%\microsoft\vault\key.txt
%ALLUSERSPROFILE%\microsoft\wdf\key.txt
%ALLUSERSPROFILE%\microsoft\winmsipc\server\key.txt
%ALLUSERSPROFILE%\microsoft\winmsipc\key.txt
%ALLUSERSPROFILE%\microsoft\wpd\key.txt
%ALLUSERSPROFILE%\microsoft\wwansvc\key.txt
%ALLUSERSPROFILE%\microsoft\key.txt
%ALLUSERSPROFILE%\microsoft help\key.txt
%ALLUSERSPROFILE%\microsoft onedrive\setup\key.txt
%ALLUSERSPROFILE%\microsoft onedrive\key.txt
%ALLUSERSPROFILE%\mozilla\updates\308046b0af4a39cb\key.txt
%ALLUSERSPROFILE%\mozilla\updates\d78bf5dd33499ec2\key.txt
%ALLUSERSPROFILE%\mozilla\updates\key.txt
%ALLUSERSPROFILE%\microsoft\uev\scripts\key.txt
%ALLUSERSPROFILE%\mozilla\key.txt
%ALLUSERSPROFILE%\microsoft\uev\inboxtemplates\key.txt
%ALLUSERSPROFILE%\microsoft\speech_onecore\key.txt
%ALLUSERSPROFILE%\microsoft\network\downloader\key.txt
%ALLUSERSPROFILE%\microsoft\network\key.txt
%ALLUSERSPROFILE%\microsoft\office\heartbeat\key.txt
%ALLUSERSPROFILE%\microsoft\office\key.txt
%ALLUSERSPROFILE%\microsoft\provisioning\assetcache\cellularux\key.txt
%ALLUSERSPROFILE%\microsoft\provisioning\assetcache\key.txt
%ALLUSERSPROFILE%\microsoft\provisioning\key.txt
%ALLUSERSPROFILE%\microsoft\search\data\applications\key.txt
%ALLUSERSPROFILE%\microsoft\search\data\temp\usgthrsvc\key.txt
%ALLUSERSPROFILE%\microsoft\search\data\temp\key.txt
%ALLUSERSPROFILE%\microsoft\search\data\key.txt
%ALLUSERSPROFILE%\microsoft\search\key.txt
%ALLUSERSPROFILE%\microsoft\settings\accounts\key.txt
%ALLUSERSPROFILE%\microsoft\settings\key.txt
%ALLUSERSPROFILE%\microsoft\smsrouter\messagestore\key.txt
%ALLUSERSPROFILE%\microsoft\smsrouter\key.txt
%ALLUSERSPROFILE%\microsoft\spectrum\key.txt
%ALLUSERSPROFILE%\microsoft\storage health\key.txt
%ALLUSERSPROFILE%\package cache\{929fbd26-9020-399b-9a7a-751d61f0b942}v12.0.21005\packages\key.txt
%ALLUSERSPROFILE%\package cache\{ec9807de-b577-47b1-a024-0251805acf24}v14.29.30133\key.txt
%ALLUSERSPROFILE%\oracle\java\key.txt
%ALLUSERSPROFILE%\package cache\{a749d8e6-b613-3be3-8f5f-045c84eba29b}v12.0.21005\packages\key.txt
%ALLUSERSPROFILE%\package cache\{a749d8e6-b613-3be3-8f5f-045c84eba29b}v12.0.21005\key.txt
%ALLUSERSPROFILE%\package cache\{b175520c-86a2-35a7-8619-86dc379688b9}v11.0.61030\packages\vcruntimeadditional_x86\key.txt
%ALLUSERSPROFILE%\package cache\{b175520c-86a2-35a7-8619-86dc379688b9}v11.0.61030\packages\key.txt
%ALLUSERSPROFILE%\package cache\{b175520c-86a2-35a7-8619-86dc379688b9}v11.0.61030\key.txt
%ALLUSERSPROFILE%\package cache\{bd95a8cd-1d9f-35ad-981a-3e7925026ebb}v11.0.61030\packages\vcruntimeminimum_x86\key.txt
%ALLUSERSPROFILE%\package cache\{bd95a8cd-1d9f-35ad-981a-3e7925026ebb}v11.0.61030\packages\key.txt
%ALLUSERSPROFILE%\package cache\{bd95a8cd-1d9f-35ad-981a-3e7925026ebb}v11.0.61030\key.txt
%ALLUSERSPROFILE%\package cache\{ca67548a-5ebe-413a-b50c-4b9ceb6d66c6}\key.txt
%ALLUSERSPROFILE%\package cache\{cf2bea3c-26ea-32f8-aa9b-331f7e34ba97}v11.0.61030\packages\vcruntimeminimum_amd64\key.txt
%ALLUSERSPROFILE%\package cache\{cf2bea3c-26ea-32f8-aa9b-331f7e34ba97}v11.0.61030\packages\key.txt
%ALLUSERSPROFILE%\package cache\{cf2bea3c-26ea-32f8-aa9b-331f7e34ba97}v11.0.61030\key.txt
%ALLUSERSPROFILE%\package cache\{e699e009-1c3c-4e50-9b57-2b39f0954c7f}v14.29.30133\packages\vcruntimeadditional_amd64\key.txt
%ALLUSERSPROFILE%\package cache\{e699e009-1c3c-4e50-9b57-2b39f0954c7f}v14.29.30133\packages\key.txt
%ALLUSERSPROFILE%\package cache\{e699e009-1c3c-4e50-9b57-2b39f0954c7f}v14.29.30133\key.txt
%ALLUSERSPROFILE%\package cache\{ec9807de-b577-47b1-a024-0251805acf24}v14.29.30133\packages\vcruntimeminimum_x86\key.txt
%ALLUSERSPROFILE%\package cache\{ec9807de-b577-47b1-a024-0251805acf24}v14.29.30133\packages\key.txt
%ALLUSERSPROFILE%\package cache\{a749d8e6-b613-3be3-8f5f-045c84eba29b}v12.0.21005\packages\vcruntimeminimum_amd64\key.txt
%ALLUSERSPROFILE%\microsoft\network\connections\key.txt
%ALLUSERSPROFILE%\package cache\{929fbd26-9020-399b-9a7a-751d61f0b942}v12.0.21005\key.txt
%ALLUSERSPROFILE%\package cache\{929fbd26-9020-399b-9a7a-751d61f0b942}v12.0.21005\packages\vcruntimeadditional_amd64\key.txt
%ALLUSERSPROFILE%\oracle\key.txt
%ALLUSERSPROFILE%\package cache\{050d4fc8-5d48-4b8f-8972-47c82c46020f}\key.txt
%ALLUSERSPROFILE%\package cache\{13a4ee12-23ea-3371-91ee-efb36ddfff3e}v12.0.21005\packages\vcruntimeminimum_x86\key.txt
%ALLUSERSPROFILE%\package cache\{13a4ee12-23ea-3371-91ee-efb36ddfff3e}v12.0.21005\packages\key.txt
%ALLUSERSPROFILE%\package cache\{13a4ee12-23ea-3371-91ee-efb36ddfff3e}v12.0.21005\key.txt
%ALLUSERSPROFILE%\package cache\{295d1583-fdb9-414b-a4c8-da539362a26b}\key.txt
%ALLUSERSPROFILE%\package cache\{33d1fd90-4274-48a1-9bc1-97e33d9c2d6f}\key.txt
%ALLUSERSPROFILE%\package cache\{37b8f9c7-03fb-3253-8781-2517c99d7c00}v11.0.61030\packages\vcruntimeadditional_amd64\key.txt
%ALLUSERSPROFILE%\package cache\{37b8f9c7-03fb-3253-8781-2517c99d7c00}v11.0.61030\packages\key.txt
%ALLUSERSPROFILE%\package cache\{37b8f9c7-03fb-3253-8781-2517c99d7c00}v11.0.61030\key.txt
%ALLUSERSPROFILE%\package cache\{38b2c744-ad08-4d5b-91a2-3fb6f739ff3e}\key.txt
%ALLUSERSPROFILE%\package cache\{42667d2e-b054-46c1-9d46-2ee1332c14c1}v14.29.30133\packages\vcruntimeadditional_x86\key.txt
%ALLUSERSPROFILE%\package cache\{42667d2e-b054-46c1-9d46-2ee1332c14c1}v14.29.30133\packages\key.txt
%ALLUSERSPROFILE%\package cache\{42667d2e-b054-46c1-9d46-2ee1332c14c1}v14.29.30133\key.txt
%ALLUSERSPROFILE%\package cache\{6cd9e9ed-906d-4196-8dc3-f987d2f6615f}v14.29.30133\packages\vcruntimeminimum_amd64\key.txt
%ALLUSERSPROFILE%\package cache\{6cd9e9ed-906d-4196-8dc3-f987d2f6615f}v14.29.30133\packages\key.txt
%ALLUSERSPROFILE%\package cache\{6cd9e9ed-906d-4196-8dc3-f987d2f6615f}v14.29.30133\key.txt
%ALLUSERSPROFILE%\oracle\java\installcache_x64\key.txt
%ALLUSERSPROFILE%\oracle\java\javapath\key.txt
%ALLUSERSPROFILE%\microsoft\netframework\key.txt
%ALLUSERSPROFILE%\microsoft\crypto\key.txt
C:\msocache\all users\{90160000-012b-0409-0000-0000000ff1ce}-c\key.txt
C:\msocache\all users\key.txt
C:\msocache\key.txt
C:\perflogs\key.txt
%ALLUSERSPROFILE%\adobe\arm\s\key.txt
%ALLUSERSPROFILE%\adobe\arm\{291aa914-a987-4ce9-bd63-ac0a92d435e5}\key.txt
%ALLUSERSPROFILE%\adobe\arm\key.txt
%ALLUSERSPROFILE%\adobe\setup\{ac76ba86-7ad7-1033-7b44-ac0f074e4100}\key.txt
%ALLUSERSPROFILE%\adobe\setup\key.txt
%ALLUSERSPROFILE%\adobe\key.txt
%ALLUSERSPROFILE%\microsoft\appv\setup\key.txt
%ALLUSERSPROFILE%\microsoft\appv\key.txt
%ALLUSERSPROFILE%\microsoft\crypto\dss\machinekeys\key.txt
%ALLUSERSPROFILE%\microsoft\crypto\dss\key.txt
%ALLUSERSPROFILE%\microsoft\crypto\keys\key.txt
%ALLUSERSPROFILE%\microsoft\crypto\pcpksp\key.txt
%ALLUSERSPROFILE%\microsoft\crypto\rsa\machinekeys\key.txt
C:\msocache\all users\{90160000-0117-0409-0000-0000000ff1ce}-c\key.txt
%ALLUSERSPROFILE%\microsoft\crypto\rsa\key.txt
C:\msocache\all users\{90160000-0117-0409-0000-0000000ff1ce}-c\access.en-us\key.txt
C:\msocache\all users\{90160000-0115-0409-0000-0000000ff1ce}-c\key.txt
C:\kms\key.txt
C:\msocache\all users\{90160000-0011-0000-0000-0000000ff1ce}-c\key.txt
C:\msocache\all users\{90160000-0016-0409-0000-0000000ff1ce}-c\key.txt
C:\msocache\all users\{90160000-0018-0409-0000-0000000ff1ce}-c\key.txt
C:\msocache\all users\{90160000-0019-0409-0000-0000000ff1ce}-c\key.txt
C:\msocache\all users\{90160000-001a-0409-0000-0000000ff1ce}-c\key.txt
C:\msocache\all users\{90160000-001b-0409-0000-0000000ff1ce}-c\key.txt
C:\msocache\all users\{90160000-002c-0409-0000-0000000ff1ce}-c\proof.en\key.txt
C:\msocache\all users\{90160000-002c-0409-0000-0000000ff1ce}-c\proof.es\key.txt
C:\msocache\all users\{90160000-002c-0409-0000-0000000ff1ce}-c\proof.fr\key.txt
C:\msocache\all users\{90160000-002c-0409-0000-0000000ff1ce}-c\key.txt
C:\msocache\all users\{90160000-0044-0409-0000-0000000ff1ce}-c\key.txt
C:\msocache\all users\{90160000-0090-0409-0000-0000000ff1ce}-c\key.txt
C:\msocache\all users\{90160000-00a1-0409-0000-0000000ff1ce}-c\key.txt
C:\msocache\all users\{90160000-00ba-0409-0000-0000000ff1ce}-c\key.txt
C:\msocache\all users\{90160000-00e1-0409-0000-0000000ff1ce}-c\key.txt
C:\msocache\all users\{90160000-00e2-0409-0000-0000000ff1ce}-c\key.txt
C:\msocache\all users\{90160000-0116-0409-1000-0000000ff1ce}-c\key.txt
%ALLUSERSPROFILE%\microsoft\diagnosis\localtracestore\key.txt
%ALLUSERSPROFILE%\microsoft\mf\key.txt
%ALLUSERSPROFILE%\microsoft\device stage\device\{113527a4-45d4-4b6f-b567-97838f1b04b0}\key.txt
%ALLUSERSPROFILE%\microsoft\diagnosis\siufloc\key.txt
%ALLUSERSPROFILE%\microsoft\diagnosis\softlanding\key.txt
%ALLUSERSPROFILE%\microsoft\diagnosis\softlandingstage\key.txt
%ALLUSERSPROFILE%\microsoft\diagnosis\tenantstorage\p-aria\key.txt
%ALLUSERSPROFILE%\microsoft\diagnosis\tenantstorage\key.txt
%ALLUSERSPROFILE%\microsoft\diagnosis\timetraveldebuggingstorage\key.txt
%ALLUSERSPROFILE%\microsoft\diagnosis\key.txt
%ALLUSERSPROFILE%\microsoft\diagnosticlogcsp\channels\key.txt
%ALLUSERSPROFILE%\microsoft\diagnosticlogcsp\collectors\key.txt
%ALLUSERSPROFILE%\microsoft\diagnosticlogcsp\devicestatedata\key.txt
%ALLUSERSPROFILE%\microsoft\diagnosticlogcsp\key.txt
%ALLUSERSPROFILE%\microsoft\drm\server\key.txt
%ALLUSERSPROFILE%\microsoft\drm\key.txt
%ALLUSERSPROFILE%\microsoft\identitycrl\int\key.txt
%ALLUSERSPROFILE%\microsoft\identitycrl\production\key.txt
%ALLUSERSPROFILE%\microsoft\identitycrl\key.txt
%ALLUSERSPROFILE%\microsoft\mapdata\key.txt
%ALLUSERSPROFILE%\microsoft\diagnosis\sideload\key.txt
%ALLUSERSPROFILE%\microsoft\netframework\breadcrumbstore\key.txt
%ALLUSERSPROFILE%\microsoft\diagnosis\scenariossqlstore\key.txt
%ALLUSERSPROFILE%\microsoft\diagnosis\feedbackhub\key.txt
%ALLUSERSPROFILE%\microsoft\device stage\device\{8702d817-5aad-4674-9ef3-4d3decd87120}\key.txt
%ALLUSERSPROFILE%\microsoft\device stage\device\key.txt
%ALLUSERSPROFILE%\microsoft\device stage\task\{07deb856-fc6e-4fb9-8add-d8f2cf8722c9}\en-us\key.txt
%ALLUSERSPROFILE%\microsoft\device stage\task\{07deb856-fc6e-4fb9-8add-d8f2cf8722c9}\key.txt
%ALLUSERSPROFILE%\microsoft\device stage\task\{e35be42d-f742-4d96-a50a-1775fb1a7a42}\en-us\key.txt
%ALLUSERSPROFILE%\microsoft\device stage\task\{e35be42d-f742-4d96-a50a-1775fb1a7a42}\key.txt
%ALLUSERSPROFILE%\microsoft\device stage\task\key.txt
%ALLUSERSPROFILE%\microsoft\device stage\key.txt
%ALLUSERSPROFILE%\microsoft\devicesync\key.txt
%ALLUSERSPROFILE%\microsoft\diagnosis\customtraceprofiles\key.txt
%ALLUSERSPROFILE%\microsoft\diagnosis\downloadedscenarios\key.txt
%ALLUSERSPROFILE%\microsoft\diagnosis\downloadedsettings\key.txt
%ALLUSERSPROFILE%\microsoft\diagnosis\etllogs\autologger\key.txt
%ALLUSERSPROFILE%\microsoft\diagnosis\etllogs\scenarioshutdownlogger\key.txt
%ALLUSERSPROFILE%\microsoft\diagnosis\etllogs\shutdownlogger\key.txt
%ALLUSERSPROFILE%\microsoft\diagnosis\etllogs\key.txt
%ALLUSERSPROFILE%\microsoft\diagnosis\eventtranscript\key.txt
%ALLUSERSPROFILE%\microsoft\crypto\systemkeys\key.txt
%ALLUSERSPROFILE%\package cache\{f65db027-aff3-4070-886a-0d87064aabb1}\key.txt

Modifies the following files

C:\kms\kms_vl_all_aio.cmd
C:\msocache\all users\{90160000-001a-0409-0000-0000000ff1ce}-c\outlklr.cab
C:\msocache\all users\{90160000-0019-0409-0000-0000000ff1ce}-c\setup.xml
C:\msocache\all users\{90160000-0019-0409-0000-0000000ff1ce}-c\publr.cab
C:\msocache\all users\{90160000-0019-0409-0000-0000000ff1ce}-c\publishermui.xml
C:\msocache\all users\{90160000-0019-0409-0000-0000000ff1ce}-c\publishermui.msi
C:\msocache\all users\{90160000-0018-0409-0000-0000000ff1ce}-c\setup.xml
C:\msocache\all users\{90160000-0018-0409-0000-0000000ff1ce}-c\pptlr.cab
C:\msocache\all users\{90160000-0018-0409-0000-0000000ff1ce}-c\powerpointmui.xml
C:\msocache\all users\{90160000-0018-0409-0000-0000000ff1ce}-c\powerpointmui.msi
C:\msocache\all users\{90160000-0016-0409-0000-0000000ff1ce}-c\setup.xml
C:\msocache\all users\{90160000-0016-0409-0000-0000000ff1ce}-c\excelmui.xml
C:\msocache\all users\{90160000-0016-0409-0000-0000000ff1ce}-c\excelmui.msi
C:\msocache\all users\{90160000-0016-0409-0000-0000000ff1ce}-c\excellr.cab
C:\msocache\all users\{90160000-0011-0000-0000-0000000ff1ce}-c\setup.xml
C:\msocache\all users\{90160000-0011-0000-0000-0000000ff1ce}-c\propsww2.cab
C:\msocache\all users\{90160000-0011-0000-0000-0000000ff1ce}-c\propsww.cab
C:\msocache\all users\{90160000-0011-0000-0000-0000000ff1ce}-c\proplusww.xml
C:\msocache\all users\{90160000-0011-0000-0000-0000000ff1ce}-c\proplusww.msi
C:\msocache\all users\{90160000-0011-0000-0000-0000000ff1ce}-c\pkeyconfig-office.xrm-ms
C:\msocache\all users\{90160000-0011-0000-0000-0000000ff1ce}-c\owow64ww.cab
C:\msocache\all users\{90160000-0011-0000-0000-0000000ff1ce}-c\office64ww.xml
C:\msocache\all users\{90160000-0011-0000-0000-0000000ff1ce}-c\office64ww.msi
C:\kms\kms_vl_all_aio_debug.log
C:\msocache\all users\{90160000-001a-0409-0000-0000000ff1ce}-c\outlookmui.msi
C:\msocache\all users\{90160000-001a-0409-0000-0000000ff1ce}-c\outlookmui.xml

Modifies multiple files.

Miscellaneous

Creates and executes the following

'<SYSTEM32>\vssadmin.exe' Delete Shadows /All /Quiet' (with hidden window)

Executes the following

'<SYSTEM32>\searchprotocolhost.exe' Global\UsGthrFltPipeMssGthrPipe3_ Global\UsGthrCtrlFltPipeMssGthrPipe3 1 -2147483646 "Software\Microsoft\Windows Search" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT; MS Search 4.0 Robot)" "%...
'<SYSTEM32>\searchfilterhost.exe' 0 768 772 780 8192 776

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