Office (OLE) / .XLS malware analysis — malicious · f69a3264a6a766ae

MALICIOUS

Office (OLE) / .XLS

71.0 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-06-07

MD5: be4d5bc5eed2f5431fd7846a627c8974 SHA-1: 9c50f556b831b82e7131be15d3a6e42cfba6a4d4 SHA-256: f69a3264a6a766ae855ec772e5e0e81613571e11336848f0e55ce2a6fcd406dc

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The critical heuristics OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN indicate the presence of Excel 4.0 macros with Auto_Open functionality, specifically utilizing the RUN function. The extracted URLs from the document body are likely part of the macro's execution chain, intended to download and execute a secondary payload. The macro's intent is to leverage these URLs for initial compromise.

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` `5111faade6798439ce43161a25c95a0c795073df8f05008e90c40cef2fd124d6`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	7798 bytes

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