Office (OLE) malware analysis — malicious · dd684bb7ddb8b3ce

MALICIOUS

Office (OLE)

169.5 KB Created: 2020-05-14 09:49:39 Authoring application: Microsoft Excel

MD5: d0cafafc68b66274d974973607569744 SHA-1: a84dec1dd2f129f5a5f0d348b90d0ee93b06c014 SHA-256: dd684bb7ddb8b3ce94c75780a31249a4207da9e0c73e491d7ede5e747386be58

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell

The file is an Excel 4.0 macro-enabled workbook. Critical heuristics indicate the presence of an Auto_Open macro, which is a common technique for executing malicious code upon opening the document. The macro uses the RUN function, which can execute arbitrary commands, and SET.VALUE to manipulate cell values, potentially for obfuscation or further execution. The specific commands identified are RUN(GV56783) and SET.VALUE(D37090,472-GET.CELL(17,DV54644)).

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` `1f2d5524b3f93129c79be4ed1c28f59ce16fe9ed65a6ffd102f0a44ffa38987d`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	129254 bytes

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