Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 65c9ed5133fc60c0…

MALICIOUS

Office (OLE)

221.5 KB Created: 2021-02-06 22:23:31 Authoring application: Microsoft Excel
MD5: 28f57cd0a7082e7364302d9340f03c3a SHA-1: a7bb593cdb12a7c6d9961493f2255edf12a9931a SHA-256: 65c9ed5133fc60c0931680753d35be69fb9420f17018794b7a4a9fc73a365bcb
140 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains Excel 4.0 macros, specifically an Auto_Open macro, which is a critical finding. The macro constructs and executes a PowerShell command to download a file from 'http://cutt.ly/AkBqUvK' and then execute it from the user's AppData directory. This indicates a downloader or droppper functionality.

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
00712a43ed8d697c45de8f5ad5aa921db26c2d4cd16e99befd235ca1c561a0c8		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1236 bytes

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