Office (OLE) / .XLS malware analysis — malicious · 61bde51a5850f884

MALICIOUS

Office (OLE) / .XLS

36.0 KB Created: 2020-11-27 11:38:31 Authoring application: Microsoft Excel First seen: 2022-04-23

MD5: d034fa1ee4a38843ec0f38fdbea9a2a3 SHA-1: 3814d05f3de874689a3c17041db7348021706f2f SHA-256: 61bde51a5850f88445963e753a20a5d75a894af4000c488bcae03d94eafb37a0

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains Excel 4.0 macros, specifically an Auto_Open function, which is a known method for executing malicious code. The critical heuristic firings indicate the presence of dangerous formula APIs within the Auto_Open macro, suggesting it's designed to run arbitrary commands. No specific family could be identified, but the technique is consistent with macro-based malware.

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` `6cb261b0bc363ba8bf10e12e3b879efd67b03fb9323a2d92e556932d198bb3cd`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6683 bytes

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