Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 99af0a930a4a13ef…

MALICIOUS

Office (OLE)

135.0 KB Created: 2007-10-10 08:15:05 Authoring application: Microsoft Excel
MD5: d99b9d1d144ce07b8e3c90cad6e1e3eb SHA-1: cde8b231afb51ca92bdbc3fb11d9124c4c5524a8 SHA-256: 99af0a930a4a13ef654530050a32870873eeaf7cadfc9ed817eb019ffc944eeb
128 Risk Score

Malware Insights

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

The file is an Excel document containing what appears to be financial data, but static analysis reveals a VBA macro with auto-execution capabilities. The heuristic 'OLE_VBA_PCODE_AUTOEXEC_EXEC' indicates that the 'workbook_open' event triggers an 'Shell' command, suggesting the macro is designed to execute arbitrary code. The presence of a large encoded blob and a 'macros.bas' file further supports this. The heap-spray pattern is a common technique used to facilitate exploit execution.

Heuristics 4

  • Heap-spray pattern detected high SC_HEAP_SPRAY
    Repeated 0x41 (A) bytes found
  • 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 project contains no executable statements low OLE_VBA_MACROS
    Document contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
76e05aa8f494acb2fefb215791b1e809b2dc74e7c891049f40d57b75bc82d4fd		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 65755 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 88 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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