Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ea597641de8a19fd…

MALICIOUS

Office (OLE)

90.5 KB Created: 2020-07-13 15:38:54 Authoring application: Microsoft Excel
MD5: b569a368d36af422cf9c32656b3210ae SHA-1: 0db43b4b6e1da2923cdafc4e21fd3054942f240c SHA-256: ea597641de8a19fd57c2873cc9f87e1f39c68b6ce56b471804e458a92ad19297
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File

The sample is an Excel 4.0 macro-enabled workbook. Critical heuristics indicate the presence of an Auto_Open macro that uses dangerous functions, specifically the RUN function. The extracted macro code confirms the Auto_Open entry and contains a string that reconstructs to a URL, which is likely used to download and execute a second-stage payload.

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
79ebf0757562d1e83eb3472d300d129c116d934b1de308e1e2d28b8128a158ae		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 22745 bytes

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