Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4c66d22465d6a548…

MALICIOUS

Office (OLE)

110.0 KB Created: 2003-01-22 01:45:00 Authoring application: Microsoft Office Word
MD5: f236d3a26f67102c11f145ac6ca6b357 SHA-1: 9a424ba6d67fe06ed7f05607bf5b290bbf3aa60f SHA-256: 4c66d22465d6a548dc7348f6d376f41945ae9ca81391847bab5c512cb7f5e68a
180 Risk Score

Malware Insights

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

The file is an Office document containing a large VBA macro. Heuristics indicate the presence of a 'Document_Open' macro that uses 'CreateObject', suggesting it's designed to execute code upon opening. The macro source is obfuscated with Chr string obfuscation. While no specific URLs or network indicators were extracted, the presence of a Document_Open macro with CreateObject is a strong indicator of malicious intent, likely to download and execute a second-stage payload.

Heuristics 5

  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_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
1c4e818d44043f9663a2f703902091905cffc89e688df26e0d2fa49bddef6476
vba-macro oletools.olevba.extract_macros (decoded VBA source) 41808 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 37 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.