Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3c3fdcab4f5df5ea…

MALICIOUS

Office (OLE)

158.0 KB Created: 2007-05-04 06:42:30 Authoring application: Microsoft Excel
MD5: 03d381548dbf6b3ef51842a0271051de SHA-1: 8e81c1de0a2e8160a798d0ebae714d41083d4cf8 SHA-256: 3c3fdcab4f5df5ea27060793b0aee06551ab04941d31aba22ded2fc8652b28b9
148 Risk Score

Malware Insights

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

The sample is an Excel file containing VBA macros. The heuristic OLE_VBA_PCODE_AUTOEXEC_EXEC indicates that an auto-executing VBA macro (workbook_open) is present and uses execution tokens, specifically 'Shell'. This suggests the macro attempts to download and execute a second-stage payload. The presence of a large encoded blob within the extracted artifact further supports this. The document body is a Chinese civil servant registration form, likely a lure.

Heuristics 5

  • 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.
  • NOP-equivalent sled detected medium SC_NOP_EQUIV_SLED
    Long run of 0x41 bytes
  • 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
2d5c2f2c26dcba2b332d6871288363cbb9337e32a4c482b50138b0b8ac86e936		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 72493 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 99 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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