Emotet — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 5ed3ebe51d0d2e11…

MALICIOUS

Office (OLE) / .XLS

142.5 KB Created: 2006-09-28 05:33:49 Authoring application: Microsoft Excel
MD5: d768eed6bb5131b09dc73d7b203f91bf SHA-1: 35d8729a2b2dce26f8a3e2df84ac72b3b4d8299e SHA-256: 5ed3ebe51d0d2e11e954d9be4c3cebf44eeb86167ee5ca0ea7da83b742f1b4d9
300 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The file is an Excel spreadsheet containing heavily obfuscated VBA macros, including a Workbook_Open auto-execution loader. Heuristics indicate the use of CreateObject and Shell execution, typical for downloading and running secondary payloads. The script attempts to construct a command line using multiple concatenated URLs, including 'http://rkeprua.com/inclube/FAXbSVAAOd1UV/', which likely serves as the source for the next stage of the infection.

Heuristics 7

  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • ClamAV: Doc.Downloader.EmotetExcel02226-9938630-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetExcel02226-9938630-0
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
ffa342a8bb4eb541fe833e6254cf3f6e2f7d6f5436c011440a061030b6684f64		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 6473 bytes

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