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

Static analysis result for SHA-256 fc324f6d809d0b9a…

MALICIOUS

Office (OLE) / .XLS

267.5 KB Created: 2007-12-07 13:06:35 Authoring application: Microsoft Excel
MD5: 3028b3e430abf7aa77ea0f5a0637701e SHA-1: f83ab56e9cc11471fd95bcf6528e722bf4292108 SHA-256: fc324f6d809d0b9a5a0b12357b87f5f4ed2cd99a554f73efc185e03b4c21a3fe
220 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1059.001 PowerShell T1140 Deobfuscate/Decode Files or Information

The sample is an Excel file containing VBA macros, specifically triggering Workbook_Open and Auto_Open events. Heuristics indicate a CreateObject call and VBA p-code execution, suggesting the macros are designed to run automatically upon opening. The document body text, while in German, discusses data transfer and updates for a 'KITA-Kinder' system, implying a lure to trick the user into opening the file and potentially enabling macros. The presence of a large 'macros.bas' file further supports macro execution. The exact payload is not discernible from the provided information, but the setup strongly suggests a macro-based downloader or initial execution stage.

Heuristics 6

  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_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
47ac43c5d6144cf2faa6402183a1a2b88ad93fd8effcf966e9bc68738066f8ef		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 402968 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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