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

Static analysis result for SHA-256 e9e09c15349efe1f…

MALICIOUS

Office (OLE) / .XLS

2.27 MB Created: 2009-08-26 05:32:19 Authoring application: Microsoft Excel
MD5: 44c442a5199847b2a16df0cd2b83c1ba SHA-1: 21092c6aa8f946258a1427bb32d038cc78aaa990 SHA-256: e9e09c15349efe1f75270952ad5fe5f1fc5f37a0a1bbf405f92b32aaf9052b86
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1569.002 Shell Execution

The sample is an Excel file containing a Workbook_Open macro that uses CreateObject to execute code. The macro exhibits VBA string obfuscation and auto-execution with execution tokens, indicating a malicious intent to run a payload. The document body contains Japanese text related to financial contributions and fund codes, which may serve as a lure.

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
97352df9db15016cb1fb5e5ce1cad60540351b07ddf154349862e2d71d32939b		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 199388 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 29 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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