Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4efc1b26de758236…

MALICIOUS

Office (OLE)

1.27 MB Created: 2009-11-10 13:02:57 Authoring application: Microsoft Excel
MD5: ea8bcab791d028739664ee311632eba2 SHA-1: 8cc69efd74332381bbca07df98e530648689c3a9 SHA-256: 4efc1b26de758236e3cf9dd476bde4e27eb540e1f01f6ad0f8d2336ce86ea7f7
280 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1059 Command and Scripting Interpreter T1566 Phishing

The file contains VBA macros, specifically a Workbook_Open auto-execution routine. This macro utilizes ShellExecute and CreateObject calls, indicating an attempt to run external commands or scripts. The presence of these high-severity heuristics strongly suggests the macro is designed to download and execute a second-stage payload. No specific family could be identified, but the delivery mechanism is consistent with macro-based malware.

Heuristics 8

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • 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
  • 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://forum.hfp.de
    • http://www.hfp.de�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
350bcaa707fa7eb8f1aac0a63c63af9f5e45f49243186d45d3223cc7130bbc33		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 275044 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 7 shell/COM execution token(s). Carved artifact contains 8 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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