{"id":280,"date":"2016-02-16T19:07:56","date_gmt":"2016-02-16T19:07:56","guid":{"rendered":"https:\/\/www.digitalforensicscorp.com\/blog\/?p=280"},"modified":"2024-12-11T19:27:54","modified_gmt":"2024-12-11T19:27:54","slug":"do-not-miss-new-thumbnail-databases-in-android-os","status":"publish","type":"post","link":"https:\/\/www.digitalforensics.com\/blog\/software\/do-not-miss-new-thumbnail-databases-in-android-os\/","title":{"rendered":"Do not miss: new thumbnail databases in Android OS"},"content":{"rendered":"<p>Like in Windows <a href=\"https:\/\/www.digitalforensics.com\/\">digital forensic investigations<\/a>, thumbnail databases play an important role in Android examinations. <!--more-->It could contain thumbnails of images and videos, deleted by the user to cover the traces of committed crime.<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><strong>Android thumbnail databases evolution<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p>In early versions on Android OS thumbnail databases were stored in thumbcache_xxx.db (where xxx is the size of the thumbnail in the base) or .thumbnailsx-y (where x, y \u2013 random number combination).<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-281 aligncenter\" src=\"https:\/\/www.digitalforensicscorp.com\/blog\/wp-content\/uploads\/2016\/02\/android_thumbnails_forensics_weare4n6.png\" alt=\"android_thumbnails_forensics_weare4n6\" width=\"975\" height=\"241\" srcset=\"https:\/\/www.digitalforensics.com\/blog\/wp-content\/uploads\/2016\/02\/android_thumbnails_forensics_weare4n6.png 975w, https:\/\/www.digitalforensics.com\/blog\/wp-content\/uploads\/2016\/02\/android_thumbnails_forensics_weare4n6-300x74.png 300w, https:\/\/www.digitalforensics.com\/blog\/wp-content\/uploads\/2016\/02\/android_thumbnails_forensics_weare4n6-768x190.png 768w, https:\/\/www.digitalforensics.com\/blog\/wp-content\/uploads\/2016\/02\/android_thumbnails_forensics_weare4n6-512x127.png 512w, https:\/\/www.digitalforensics.com\/blog\/wp-content\/uploads\/2016\/02\/android_thumbnails_forensics_weare4n6-920x227.png 920w\" sizes=\"auto, (max-width: 975px) 100vw, 975px\" \/><\/p>\n<p style=\"text-align: center;\"><em>Figure 1. Thumbnails saved in .<\/em><em>thumbnails3\u20141967290299<\/em><\/p>\n<p><em>\u00a0<\/em><\/p>\n<p>Then such databases could be found in imgcache.0 and imgcache.1 files.<\/p>\n<p>Now Android thumbnails are stored in imgcache.0 and imgcache.1 files.<\/p>\n<p>But there are also some new thumbnail databases:<\/p>\n<ul>\n<li>imgcache.idx<\/li>\n<li>imgcacheBig.0<\/li>\n<li>imgcacheBig.idx<\/li>\n<li>imgcacheMicro.0<\/li>\n<li>imgcacheMicro.idx<\/li>\n<li>imgcacheMini.0<\/li>\n<li>imgcacheMini.idx<\/li>\n<\/ul>\n<p style=\"text-align: center;\"><strong>New Android thumbnail databases<\/strong><\/p>\n<p>As it has already been mentioned, the most recent Android OS version could contain the following thumbnail database files: imgcache.idx, imgcacheBig.0, imgcacheBig.idx, imgcacheMicro.0, imgcacheMicro.idx, imgcacheMini.0 and imgcacheMini.idx.<\/p>\n<p>Files with idx extension contain 96\u042596px thumbnails and probably some metadata which we can\u2019t interpret now.<\/p>\n<p>Files imgcache.0, imgcacheBig.0, imgcacheMicro.0 and imgcacheMini.0 contain random-sized thumbnails:<\/p>\n<ul>\n<li>imgcacheMicro.0 contains 96\u042596px thumbnails<\/li>\n<li>imgcacheMini.0 contains 240\u0425144px thumbnails<\/li>\n<li>imgcacheBig.0 contains 444\u0425250px or 444\u0425333px thumbnails<\/li>\n<li>imgcache.0 contains 240\u0425144px, 444\u0425250px or 444\u0425333px thumbnails<\/li>\n<\/ul>\n<p>Sometimes, a digital forensic examiner can find thumbnails of a different size in these databases.<\/p>\n<p>For example, during the forensic examination of the Samsung Galaxy Core 2 Duos (SM-G355H) running Android 4.4.2, we found imgcacheMicro.0 and imgcacheMini.0 files which contained 96\u042596px thumbnails.<\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-282 aligncenter\" src=\"https:\/\/www.digitalforensicscorp.com\/blog\/wp-content\/uploads\/2016\/02\/android_thumbnail_database_forensics.png\" alt=\"android_thumbnail_database_forensics\" width=\"974\" height=\"422\" srcset=\"https:\/\/www.digitalforensics.com\/blog\/wp-content\/uploads\/2016\/02\/android_thumbnail_database_forensics.png 974w, https:\/\/www.digitalforensics.com\/blog\/wp-content\/uploads\/2016\/02\/android_thumbnail_database_forensics-300x130.png 300w, https:\/\/www.digitalforensics.com\/blog\/wp-content\/uploads\/2016\/02\/android_thumbnail_database_forensics-768x333.png 768w, https:\/\/www.digitalforensics.com\/blog\/wp-content\/uploads\/2016\/02\/android_thumbnail_database_forensics-512x222.png 512w, https:\/\/www.digitalforensics.com\/blog\/wp-content\/uploads\/2016\/02\/android_thumbnail_database_forensics-920x399.png 920w\" sizes=\"auto, (max-width: 974px) 100vw, 974px\" \/><\/p>\n<p style=\"text-align: center;\">Figure 2. <em>Thumbnails saved in <\/em>imgcachebig.0<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><strong>Android thumbnail databases structure<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: left;\">If you open an Android thumbnail database file in a hex-viewer the first thing you spot is a typical JPG file header.<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: left;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-283 aligncenter\" src=\"https:\/\/www.digitalforensicscorp.com\/blog\/wp-content\/uploads\/2016\/02\/Android_thumbnails_forensic_analysis.png\" alt=\"Android_thumbnails_forensic_analysis\" width=\"716\" height=\"211\" srcset=\"https:\/\/www.digitalforensics.com\/blog\/wp-content\/uploads\/2016\/02\/Android_thumbnails_forensic_analysis.png 716w, https:\/\/www.digitalforensics.com\/blog\/wp-content\/uploads\/2016\/02\/Android_thumbnails_forensic_analysis-300x88.png 300w, https:\/\/www.digitalforensics.com\/blog\/wp-content\/uploads\/2016\/02\/Android_thumbnails_forensic_analysis-512x151.png 512w\" sizes=\"auto, (max-width: 716px) 100vw, 716px\" \/><\/p>\n<p style=\"text-align: center;\"><em>Figure 3. File imgcache.0 opened in a hex-viewer<\/em><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: left;\">It means that data from such databases can be extracted not only with the help of commercial mobile forensic suites, but also using a simple file carving and indexing application &#8211; Scalpel.<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: left;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-284 aligncenter\" src=\"https:\/\/www.digitalforensicscorp.com\/blog\/wp-content\/uploads\/2016\/02\/Android_thumbnail_database_carving.png\" alt=\"Android_thumbnail_database_carving\" width=\"799\" height=\"572\" srcset=\"https:\/\/www.digitalforensics.com\/blog\/wp-content\/uploads\/2016\/02\/Android_thumbnail_database_carving.png 799w, https:\/\/www.digitalforensics.com\/blog\/wp-content\/uploads\/2016\/02\/Android_thumbnail_database_carving-300x215.png 300w, https:\/\/www.digitalforensics.com\/blog\/wp-content\/uploads\/2016\/02\/Android_thumbnail_database_carving-768x550.png 768w, https:\/\/www.digitalforensics.com\/blog\/wp-content\/uploads\/2016\/02\/Android_thumbnail_database_carving-512x367.png 512w\" sizes=\"auto, (max-width: 799px) 100vw, 799px\" \/><\/p>\n<p style=\"text-align: center;\"><em>Figure 4. Thumbnails carved out of\u00a0.thumbdata3&#8211;1967290299 file with Scalpel<\/em><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><strong>Conclusion<\/strong><\/p>\n<p>Of course, digital forensic tools, for example, Oxygen Forensic, support data extraction from Android thumbnail databases, but the new DB types could be missed. So it\u2019s very important to perform manual analysis of devices running this OS to find new thumbnail database types and extract digital evidence from them.<\/p>\n<p>&nbsp;<\/p>\n<p>About the authors:<\/p>\n<p><a href=\"http:\/\/linkedin.com\/in\/igormikhaylovcf\" target=\"_blank\" rel=\"noopener\">Igor Mikhaylov<\/a><\/p>\n<p>Interests: Computer, Cell Phone &amp; Chip-Off Forensics<\/p>\n<p><a href=\"https:\/\/www.linkedin.com\/in\/oleg-skulkin-96652a87\" target=\"_blank\" rel=\"noopener\">Oleg Skulkin<\/a><\/p>\n<p>Interests: iOS forensics, Android forensics, Mac OS X forensics, Windows forensics, Linux forensics<\/p>\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"Like in Windows digital forensic investigations, thumbnail databases play an important role in Android examinations.","protected":false},"author":126,"featured_media":255,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"csco_display_header_overlay":false,"csco_singular_sidebar":"","csco_page_header_type":"","footnotes":""},"categories":[6],"tags":[],"class_list":{"0":"post-280","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-software","8":"cs-entry"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.6 (Yoast SEO v27.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Do not miss: new thumbnail databases in Android OS<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.digitalforensics.com\/blog\/software\/do-not-miss-new-thumbnail-databases-in-android-os\/\" \/>\n<meta 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