Office (OLE) / .XLS malware analysis — malicious · 16d8b6d7bf168c79

MALICIOUS

Office (OLE) / .XLS

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

MD5: 403bb2c4cd64125c987fcdbcc442698e SHA-1: 11a1d5edb3b6f5f09118152c479e052c0d06b5fe SHA-256: 16d8b6d7bf168c79e04dd2f8d25dfb2e2c81c016083b5710f31827cc15c60b79

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 (XLM) macro-enabled spreadsheet that contains an Auto_Open macro. This macro is configured to execute a command that downloads a second-stage payload from the URL 'http://0xc12a24f5/cc.html'. The document also contains a lure to enable macros, 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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