Office (OLE) / .XLS malware analysis — malicious · c68b9d14350eeba7

MALICIOUS

Office (OLE) / .XLS

469.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel

MD5: 72fc8df018fdbe5b04841e8533c40aec SHA-1: ea352b00e793559fe1f87dd4731140d8f70b8a4b SHA-256: c68b9d14350eeba75860fdf9fc375e4fe4126eefc9bb79d717c32d026ac7b6bb

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The file is an Excel spreadsheet containing Excel 4.0 (XLM) macros. Critical heuristics indicate the presence of an Auto_Open defined name and the use of dangerous formula APIs, specifically the RUN function. The macro sheet contains a reference to a URL, 'http://StarWmineiro.ch/casrtnoar/count.php', which is likely used to download and execute a second-stage payload. The document body text is heavily obfuscated and appears to be a lure.

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` `877b24336da75137a3a99cda7752c4a2d3bef2725374cfe3b531d5b368960619`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	14228 bytes

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