Office (OLE) / .XLS malware analysis — malicious · 5e3c6cdd2fea9abc

MALICIOUS

Office (OLE) / .XLS

172.0 KB Created: 2018-02-18 06:29:00 Authoring application: Microsoft Excel

MD5: e021c1c29aa2af60767fae6ef73ba9b7 SHA-1: 8cd9d05d69ccec763c766fa8edeb16bebe59b28c SHA-256: 5e3c6cdd2fea9abc1d5c048187f866005e3ccb38409c6e6b7472636d81c0dda7

80 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The critical heuristic firing indicates the presence of an Excel 4.0 Auto_Open macro, which is a known method for executing malicious code upon opening the spreadsheet. The macro sheet itself is heavily obfuscated, preventing a detailed analysis of its specific actions, but the presence of an Auto_Open entry strongly suggests it's designed to run a payload. The document body contains only random-looking strings, offering no contextual clues.

Heuristics 2

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.
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` `da0b18f200b09a8b87f47030df84c74febf9c2fe257020f2bc1f14546f43dd1a`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	90269 bytes

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