Office (OLE) malware analysis — malicious · 69ec020c695d6d31

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:42:32 Authoring application: Microsoft Excel

MD5: 268708e978078e5153a6b0a887955db7 SHA-1: 6043a50883f45d052e69f4cffc2ea2c72072f490 SHA-256: 69ec020c695d6d31fd267a0810486865b5808e9828fb7ce31732cd86b33c9827

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution

This Excel file contains Excel 4.0 (XLM) macros, specifically an Auto_Open defined name, which is a known technique for executing malicious code upon opening the workbook. The presence of dangerous formula APIs like RUN indicates the macro is designed to execute external commands or download payloads. The macro sheet itself contains obfuscated data, suggesting an attempt to hide its malicious functionality.

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` `fbbee780c5308ab89f845482b9e830515cdea51393a1c73919ca2b7061f33073`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6562 bytes

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