Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fb1df2bf596883d3…

MALICIOUS

Office (OLE)

90.5 KB Created: 2020-07-13 15:38:54 Authoring application: Microsoft Excel
MD5: 55d65301a639c4bf8849658c44883d2e SHA-1: 65d8b3f810409e19a83fbb5ed3f3fae9f957160f SHA-256: fb1df2bf596883d3cb6d0bce87b69fb31db842de3a3480b8b0a997be420ff4f1
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open function that is triggered upon opening the workbook. This macro is designed to execute a dangerous function, likely to download and run a second-stage payload. The reconstructed URL 'http://sorbeingduq.cmlBvkFzxURLMOnDwT4AJCSE\QYGKyIfZVP' is embedded within the macro, indicating its role as the download source.

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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