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

Static analysis result for SHA-256 ba15072eb08919fa…

MALICIOUS

Office (OLE) / .XLS

117.0 KB Created: 2020-06-18 01:19:01 Authoring application: Microsoft Excel
MD5: 2d59ed6495716fb82f4b1070587d5832 SHA-1: 2a88a03a3f480ae898dae201dddc45fd22791d25 SHA-256: ba15072eb08919fa7ba8aa177c78eecfed034042e2fd08df6fc6d6fb2bf09c42
240 Risk Score

Malware Insights

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

The file is a malicious Excel spreadsheet containing VBA macros, specifically a Workbook_Open macro that is automatically executed when the file is opened. This macro utilizes CreateObject, indicating it is likely designed to download and execute a second-stage payload. The ClamAV detection 'Xls.Dropper.Agent-8078425-0' further supports its role as a dropper. No specific family could be identified, but the behavior is consistent with macro-based malware delivery.

Heuristics 6

  • ClamAV: Xls.Dropper.Agent-8078425-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8078425-0
  • 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
b95085fbae3a92005b8a069f4244cce37972fdf259909d9b605adefc4a7bbb68		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 4375 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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