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

Static analysis result for SHA-256 32a517d64edab816…

MALICIOUS

Office (OLE) / .XLS

31.5 KB Created: 2020-04-19 00:28:00 Authoring application: Microsoft Office Word
MD5: bcf370d379f874abc80a1d683b679519 SHA-1: 9d25c455fddbe753819c93875196c1b3ddaa76e8 SHA-256: 32a517d64edab8169269d388f2030ce8d47a8fd0867e0fab990b71801257345f
328 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1059.001 PowerShell T1105 Ingress Tool Transfer

The presence of multiple high-severity VBA macro heuristics, including AutoOpen and Workbook_Open, strongly indicates that the document is designed to execute code automatically. The 'CreateObject' call and 'p-code auto-exec with execution tokens' heuristic suggest the macro attempts to launch external processes or download additional payloads. The ClamAV detection as 'Doc.Dropper.Agent' further supports this, pointing to a dropper functionality. No specific family could be identified, but the techniques used are common for initial access malware.

Heuristics 10

  • ClamAV: Doc.Dropper.Agent-7675439-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-7675439-0
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_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
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • 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://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
190e3b75d71410333e9a88555efd6ca3fa0f0e9ced067697895cbff26fb96113		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 9663 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 9 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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