Office (OLE) / .XLS malware analysis — malicious · 5e5775fbe02d92a8

MALICIOUS

Office (OLE) / .XLS

59.5 KB Created: 2020-05-25 07:38:15 Authoring application: Microsoft Excel

MD5: 08ce78f2f93a0e316e7d76c04637ebd6 SHA-1: 80164efac07a40a7a26c0604a41e71b6cca2acfd SHA-256: 5e5775fbe02d92a8940e5a193b510cedf336a661538fc60058aa77e9e59d0eab

200 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file is an Excel XLS document containing Excel 4.0 macros, specifically an Auto_Open macro. This macro is configured to execute dangerous functions, including RUN, and is designed to download a payload from the hardcoded URL. The ClamAV detection further confirms its malicious nature as a dropper.

Heuristics 4

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.
ClamAV: Xls.Dropper.Agent-7890857-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Dropper.Agent-7890857-0
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` `75a24257354b59a6c21f1b70429b6ee1c7afcb679ece9a1912080145bee7ae37`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	34477 bytes

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