Office (OLE) / .XLS malware analysis — malicious · 0f3653098272bfcd

MALICIOUS

Office (OLE) / .XLS

49.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel

MD5: 8d75278a7fbdebe16ba2aa75cb714e86 SHA-1: b926281d3f93a265e47b0bc20cc51421fb787076 SHA-256: 0f3653098272bfcd29fa86fa531b06666eae4ae24964ef49681242c6c4e4a7de

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file is an Excel 4.0 macro-enabled workbook. Heuristics indicate the presence of an Auto_Open macro and the use of dangerous formula APIs, specifically 'RUN=0'. This strongly suggests the macro is designed to execute an external payload. The extensive obfuscated text in the document body and the truncated script listing prevent a more detailed analysis of the payload's nature or destination.

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` `c5a782f8241b0323f09b9d56aba338f4853fdd0258b68708d650e9482fef6e8c`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	13138 bytes

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