Office (OLE) / .XLS malware analysis — malicious · 147679b401d295a5

MALICIOUS

Office (OLE) / .XLS

111.5 KB Created: 2019-03-02 04:34:00 Authoring application: Microsoft Excel

MD5: ee70031efbe62f81aa3c434ae0636a09 SHA-1: a9ebd7146771b922cb9a21456566fce7e93919c0 SHA-256: 147679b401d295a5300cde9e2ad39a1a2b5a09757c1a248dd53914bdb9678140

140 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The sample is an Excel 4.0 macro-enabled spreadsheet. Heuristics indicate the presence of an Auto_Open macro, which is a common technique for executing malicious code upon opening the document. The document body displays a "DOCUMENT PROTECTED!" lure, prompting the user to enable content, which would trigger the macro execution. No specific IOCs like URLs or hashes were extracted, but the sheet names are included as potential indicators.

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.

Filename	Kind	Source	Size
`xlm_macros.txt` `605733260dad21e5c70534d34aa531e4dc5fb3a59b8daed444515f4e34a34a04`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	57374 bytes

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