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

Static analysis result for SHA-256 435093feae409456…

MALICIOUS

Office (OLE) / .XLS

1.34 MB Created: 2025-07-11 18:48:27 Authoring application: Microsoft Excel Compatible / Openpyxl 3.1.5
MD5: 164e4f6042eea0d5462bace2cc92f8b6 SHA-1: 504aa79b06b36cabe13c96f5781f7d7f47b912f7 SHA-256: 435093feae409456b472028b78e5de8132261406c35d0f3dd28a0dc620deae21
228 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.002 Spearphishing Attachment T1140 Deobfuscate/Decode Files or Information

The sample is a macro-enabled Excel file that contains a Workbook_Open macro, indicating it is designed to execute malicious code upon opening. The presence of CreateObject and Environ() calls suggests it attempts to interact with the system environment and potentially download or execute further stages. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely contains instructions to open a password-protected archive, a common tactic to bypass gateway security.

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
6c9a574bf6f1296e62d25d7613134bf78fe3b5dfd10a03f5654fdd036a3269c0		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3085 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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