Office (OLE) / .XLS malware analysis — malicious · 5cc3c0c77be513af

MALICIOUS

Office (OLE) / .XLS

46.5 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-06-09

MD5: 69ba92c01861e3f728d94bbc8063661c SHA-1: bd2f2d3e8d13ac56f1ced86ab516c2d3c9038b2e SHA-256: 5cc3c0c77be513afc0d021c6fedb1a852ea89359be77e1cfc95aa1825a12089e

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open function, which is a known method for executing malicious code. The macro attempts to download a payload from multiple concatenated URLs, including 'http://188.166.245.112/template/hK3aUglMDTKv1Em82R/'. 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.

Filename	Kind	Source	Size
`xlm_macros.txt` `f02d63843d495ffd8e99f1b7fe5f87a80501a758c9a61d8585f8be9700f36cb3`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	7798 bytes

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