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

Static analysis result for SHA-256 1f108a10b866def6…

MALICIOUS

Office (OLE) / .XLSX

37.0 KB Created: 2021-04-28 09:53:57 Authoring application: Microsoft Excel
MD5: 87d28990225d4297535c211d28a34690 SHA-1: 3efc3021f506f72e06386d7374cb317a06fc3cee SHA-256: 1f108a10b866def65686fcb0e0c10612152288ea1f7a6158e5ada37f26d03265
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder

The file contains VBA macros, specifically a Workbook_Open macro that is triggered automatically when the spreadsheet is opened. This macro utilizes a CreateObject call, indicating it likely attempts to execute arbitrary code or download a second-stage payload. The presence of a Workbook_Open macro and CreateObject call strongly suggests a malicious intent, likely for initial execution or payload delivery.

Heuristics 5

  • 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
d47611e67be2b0150f128e553679bea488f2e6d2bfa1797279dc5f861eeef4aa		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 4629 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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