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

Static analysis result for SHA-256 bfa7969a481c8857…

MALICIOUS

Office (OLE) / .XLS

28.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: bac74e3006b9c6d544d2ace87a23ac40 SHA-1: 5e952c0fe065294e97088366496628371b2bf4f6 SHA-256: bfa7969a481c88574a145518ad139f2bf0e284368624812c3fa5f68f1c658df8
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder

The file is an Excel spreadsheet containing VBA macros. The Workbook_Open macro is present and configured to execute automatically when the file is opened. This macro uses CreateObject, indicating it likely attempts to launch a secondary payload or perform malicious actions. The presence of 'macros.bas' suggests a standard macro-based delivery mechanism. Without further script content, the exact payload and persistence method are unknown, but the auto-execution and CreateObject call are strong indicators of malicious intent.

Heuristics 5

  • 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
880c8e6e4d32451c1c6e8b44e91ab06cd0fbd61bbba60730a255e6bc468c5abd
vba-macro oletools.olevba.extract_macros (decoded VBA source) 2534 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.