Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 8032602e7a2db3ce…

MALICIOUS

Office (OLE) / .XLS

142.5 KB Created: 2006-09-28 05:33:49 Authoring application: Microsoft Excel
MD5: eac50d6d70df2ab19880263d5c9b7613 SHA-1: 5261c758e432cb71d2200895a76504f8b7616b41 SHA-256: 8032602e7a2db3ceea482f7e007577295dc3c41da8e4c4b5f2ba32074b6a1007
280 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.002 Spearphishing with Malicious Attachment T1059.005 Visual Basic

The file is an Excel spreadsheet containing VBA macros, specifically a Workbook_Open macro that executes a command. The script uses CreateObject to instantiate Wscript.Shell, which is then used to execute a batch file located at 'c:\programdata\rtyusdj.bat'. The script also contains a long, obfuscated string that appears to be a list of URLs, likely for downloading additional payloads. The presence of Wscript.Shell and the Workbook_Open auto-execution strongly suggests a downloader functionality.

Heuristics 7

  • 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.
  • 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 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
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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