Emotet — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 cf5f5a6795b6bddd…

MALICIOUS

Office (OOXML) / .XLSX

92.0 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000
MD5: c70ffd9f61fa5db71ad0876dc743365b SHA-1: 9d7b4bc5adddeb4e34daa9dcfb1befc3cdb0cb41 SHA-256: cf5f5a6795b6bddd1bbc23b71e48945ea8ab1aca2e01df04ad00410b32f94b3a
200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.002 Spearphishing Attachment

The file is identified as malicious by ClamAV with the signature 'Xls.Downloader.EmotetRed02221-9938910-0'. Static analysis revealed a Workbook_Open macro, a common Emotet delivery technique. The macro uses CreateObject to execute a downloaded payload. The DOC BODY contains obfuscated commands that reconstruct several URLs, which are likely sources for the second-stage payload. The reconstructed URLs are: 'http://harperhouseproducts.com/Merchandise2/ARSf1LIcOauhH1rDiRh/', 'http://holubivido.com/eln-images/zqqgz0YXapiWbF/', 'http://magicblog.tatomotors.com/wp-incudades/7faN9/', 'http://chastongrodi.com/eln-images/sSsC', 'http://seacupus.com/eln-images/AYvkyzg/', 'http://ericandrobin.com/cgi/qRe8rAGHNOOG1/', 'http://soantiqeus.com/cgi/9ii/', 'https://greenlawninriagatio.net/GLI_New/Jrlt3mOiEzo/', and 'https://on-lineventures.net/GMA_New/Jrlt3mOiEzo/'.

Heuristics 5

  • ClamAV: Xls.Downloader.EmotetRed02221-9938910-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.EmotetRed02221-9938910-0
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
de7bcbc45ff0a77d05d9af662bacc316e71be11a980e94f6673e556a5dd9d1bc		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 12808 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
6fd0a6cfc5b5c7db709d8227731e4274f96c80a915d97ff0103b34e4e10c0ceb		 vba-project OOXML VBA project: xl/vbaProject.bin 37888 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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