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

Static analysis result for SHA-256 bb22cd647e7ffc08…

MALICIOUS

Office (OLE) / .XLA

699.5 KB Created: 2004-04-06 20:50:55 Authoring application: Microsoft Excel
MD5: 919fbc4cf08961a692fb6e5e941dae9a SHA-1: c0a2bec54ccb6ef77dbc66c8df5b119312f2cc2b SHA-256: bb22cd647e7ffc085a6587dcce2b9d2f4dda9b37fd6da743694b9d8e20cedd02
280 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file is an Excel macro-enabled workbook (XLA) containing multiple auto-execution VBA macros (Workbook_Open, Auto_Open, Auto_Close). A critical heuristic firing indicates the use of the Shell() function within the VBA code, which is commonly used to execute arbitrary commands or download and run additional payloads. The presence of embedded URLs, specifically http://www.cema.edu.ar/~jvarela/Installed.htm, suggests a potential download source for a secondary stage. The extracted file 'macros.bas' is also flagged as suspicious.

Heuristics 8

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • 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
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.cema.edu.ar/~jvarela
    • http://www.cema.edu.ar/~jvarela/Installed.htm
    • http://www.cema.edu.ar/~jvarela���y������K�@http://www.cema.edu.ar/~jvarela�@`��@�qnNormalCJ_HaJmH

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
a6a315703926d37e1c1cad28379b1cd7dfaae031c6867db99a405d538188678d		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 867488 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 10 shell/COM execution token(s). Carved artifact contains 68 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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