Office (OLE) / .XLSX malware analysis — malicious · 229bd13fcbcc85a2

MALICIOUS

Office (OLE) / .XLSX

138.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-07-13

MD5: e4af9db5f875be1e930f32419d048ba9 SHA-1: 70a368382b928aa05354d9432def96066f7a8bc8 SHA-256: 229bd13fcbcc85a2352569b325bcbf88a81251dc41feaed6fc84af1782723dc7

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic, VBScript, JavaScript, and PowerShell T1204.002 Malicious File

The sample is an Excel 4.0 macro-enabled spreadsheet that contains an Auto_Open macro. The macro sheet includes a lure to enable macros, and the Auto_Open macro itself uses dangerous functions like RUN to execute code. The embedded URL 'http://bqx12lnjk03rrdio.xyz/i.' is likely used to download and execute a second-stage payload.

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.
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `3a08691eed72e5ed205a0b2d682f61d57bf1de10bae67e5c55da30ecdcba1b08`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	4335 bytes

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