Office (OLE) malware analysis — malicious · d47d669db89656d9

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:43:53 Authoring application: Microsoft Excel

MD5: 4495eb7c5facb78a2110b8b50600b483 SHA-1: c4e167097e3875ffb3c318a36a3910bdbf206f3f SHA-256: d47d669db89656d9e8df5d918e905548a56c9e0d5b6fb3df6dd5f4cdcf0c7c48

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-enabled workbook containing an Auto_Open function, which is a common technique for executing malicious code upon opening. The macro sheet contains references to dangerous formula APIs, specifically 'RUN', indicating an attempt to execute arbitrary commands. The presence of the Auto_Open entry and the use of dangerous functions strongly suggest this file is designed to download and execute a secondary payload.

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` `1377fbb9db6ed3c622f3e4339d9b6440e6ec32a68c10f085e3be45cbd2ed4eec`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6509 bytes

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