Office (OLE) malware analysis — malicious · e6043f8654c78e3e

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-27 11:43:15 Authoring application: Microsoft Excel

MD5: 963c28b376e7064bec845925f1224962 SHA-1: 23ea63003f6c5a60e30b3c7b81dc2ad0298d8308 SHA-256: e6043f8654c78e3e59f305ce7fd3e3ca538622619e841734fa6a119bd6133d81

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 defined name, which is a critical finding indicating automatic execution. The presence of dangerous formula APIs like RUN further suggests malicious intent. The macro sheet itself is likely designed to download and execute a second-stage payload, although the specific payload and its destination are not directly extractable from the provided evidence.

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` `a26445b031424d9bb82ed206f56f75160d617f2d0d08795f18040d31b26ca922`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6570 bytes

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