Office (OLE) / .XLS malware analysis — malicious · 5b957ed1c193f710

MALICIOUS

Office (OLE) / .XLS

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

MD5: f801269bc4788e5ca417877364fc69c5 SHA-1: 567fe5b65b63257b9938fea5ff8f1e33437c243c SHA-256: 5b957ed1c193f7100838ba1b7e8be83382313e6fbf226d2cdc39e12b6dadb02b

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open entry that utilizes dangerous formula APIs, specifically the RUN function. This strongly suggests the macro is designed to download and execute a secondary payload from one of the embedded URLs. The macro sheet itself contains references to these URLs, further supporting this conclusion.

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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