Office (OLE) malware analysis — malicious · 37e5ed5ecf9eeff8

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:45:20 Authoring application: Microsoft Excel

MD5: 33fba02f52baf45febb070926846c295 SHA-1: f249521aaa7d9dfd39057c111c2d08356b105c45 SHA-256: 37e5ed5ecf9eeff8c6b0579c3c9e2b4a1a8c4560e8dcb6d51cb4c82d78318ea3

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains Excel 4.0 macros, specifically an Auto_Open function, which is a known method for executing malicious code within spreadsheets. The critical heuristic firings indicate the presence of dangerous formula APIs, suggesting the macro is designed to perform harmful actions. While no specific URLs or payloads were extracted, the presence of Auto_Open and dangerous functions strongly implies an attempt to execute arbitrary code.

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` `ef7a56cbfb3a2175a5d071ae16773112d43826a89fa0de97a6cf0a41efa66c72`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6590 bytes

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