Office (OLE) / .XLS malware analysis — malicious · 69c070d246282ec9

MALICIOUS

Office (OLE) / .XLS

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

MD5: 91b414431419378f850b808bb05ce483 SHA-1: 86bbea91bf4359a85e77aded2b887cccac0bed42 SHA-256: 69c070d246282ec956e78e5dc9487c380377cb29377b29d5773a5bd30107f148

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file contains Excel 4.0 macros, specifically an Auto_Open function, which is a known technique for executing malicious code. The macros are configured to access several URLs, indicating an intent to download and execute a secondary payload. The presence of the Auto_Open function and the execution of external resources strongly suggest a malicious document designed 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` `f83c1e7392699acb02f69ec3ffd4b4b11e29d3a6381df4b6ea4e60977f47b16d`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	7590 bytes

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