Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 920103d9ed8a277f…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:39:05 Authoring application: Microsoft Excel
MD5: ff443c420bf3cb0da1576ca2584c8ef5 SHA-1: 28e7449bf8ecd1c03260f0cb7c1553722186c594 SHA-256: 920103d9ed8a277fe0bc9c835d2687945941a3ef5faa4ce7afc7c78d73f3beaf
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains Excel 4.0 macros, specifically an Auto_Open function, which is a known method for executing malicious code within spreadsheets. The presence of dangerous formula APIs like RUN indicates an intent to execute arbitrary commands or download further payloads. Without further context or network activity, the exact payload and family remain undetermined.

Heuristics 3

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
c910d960c55d4de88f080d6287a747a6d10cbda8d6a9387725cecf36b0aa2303		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6465 bytes

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