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

Static analysis result for SHA-256 b8f63bf44cb81944…

MALICIOUS

Office (OLE) / .XLS

1.14 MB Created: 2008-12-29 04:50:15 Authoring application: Microsoft Excel
MD5: e749b167e3c13089f60875bb289b32d4 SHA-1: 1d18e3291f4d7bfc2ea9d5b2eeb2648547fe2807 SHA-256: b8f63bf44cb8194485b14f025996c78e6cd059ab29abe13bdd5bcced1457be0a
220 Risk Score

Malware Insights

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

The presence of a Workbook_Open macro, combined with CreateObject calls and ShellExecute references, strongly indicates that this Excel file is designed to execute arbitrary code upon opening. The VBA p-code auto-execution heuristic further supports this, suggesting the macro is intended to run automatically. While no specific URLs or hashes were extracted, the overall pattern points to a downloader or droppper functionality.

Heuristics 6

  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
7f939e15cacd1979638ddd1f0a599aa33b67aa1d9d8415c407ef54d1b3c9a2bf		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 657524 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 6 shell/COM execution token(s). Carved artifact contains 74 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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