Office (OLE) / .XLS malware analysis — malicious · 97badcd892541a83

MALICIOUS

Office (OLE) / .XLS

1.41 MB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-04-20

MD5: d699e20407e9feff78314099a5d3d78b SHA-1: b604f0808207c7b9f41e74d6ba7103c44c253fea SHA-256: 97badcd892541a83867d2e97a80eee1c38487289c9637dce74eb0861bd44756b

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell

The sample contains Excel 4.0 macros, specifically an Auto_Open macro that utilizes dangerous functions like RUN. This indicates an attempt to automatically execute code upon opening the spreadsheet. The extracted URLs are likely used to download and execute a second-stage payload. No VBA macros were found to contain executable statements, but the XLM macros are sufficient to indicate malicious intent.

Heuristics 4

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.
VBA project contains no executable statements low OLE_VBA_MACROS

Document contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `a035e077f3629a97a488963999979285cc4cf76e4f34767edff241ef729bfcc5`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	8652 bytes
`macros.bas` `ec5c7d8dd6f9aa509d935fa0cf11a47069b7194d7e83164a72d78bb4580794bc`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1790 bytes

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