Office (OLE) malware analysis — malicious · 7ff50b8525de4313

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:40:17 Authoring application: Microsoft Excel

MD5: cd3baceeadae3448a8888313997d4097 SHA-1: 11b3f6ac9b98aa58d1ae9b5eccb9a62026a8bad8 SHA-256: 7ff50b8525de43131ddb00e4da0b40253486172cfb6e59e8c9971861134bb4e8

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file is an Excel 4.0 macro sheet containing an Auto_Open function, which is a critical finding indicating the potential for automatic execution of malicious code upon opening. The presence of dangerous formula APIs like RUN further supports this. The macro sheet likely serves as a loader for a second-stage payload, although the specific payload and its delivery mechanism are not detailed in 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` `1474c5d1e1bb2c804394d33359febed8ef3b9b7b554480f2a5e581efb1f070b3`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6857 bytes

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