Office (OLE) / .XLS malware analysis — malicious · ba1b3295e0e59d28

MALICIOUS

Office (OLE) / .XLS

36.0 KB Created: 2020-11-25 10:27:02 Authoring application: Microsoft Excel

MD5: 4a0409b21aa2c2de61386ea149f50d38 SHA-1: 6828474875bb7dd930427cfc29e7cef90d54d000 SHA-256: ba1b3295e0e59d28cbbc33b2365898fd2d87697fcdbb36ea4f040ce9901b451b

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1566.001 Spearphishing Attachment

The sample is an Excel 4.0 macro-enabled spreadsheet. Heuristics indicate the presence of an Auto_Open defined name, which is a critical indicator of malicious intent. The `RUN=0` function call within the XLM macro suggests the execution of arbitrary commands, likely to download and execute a second-stage payload. The document body contains obfuscated text, further supporting a malicious intent.

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` `1c03bc7bfedcdc810e0090788b98e1aeae892a43486aa0bd8c2ae59afc7bdca9`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6591 bytes

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