Office (OLE) / .XLSX malware analysis — malicious · 067649f003492cbb

MALICIOUS

Office (OLE) / .XLSX

63.6 KB Created: 2021-12-16 23:53:43 Authoring application: Microsoft Excel

MD5: 5272441080e290f683af62d1a1096cc0 SHA-1: f9410347125537cffa497953c35a94700dca8080 SHA-256: 067649f003492cbbf1b4a7ebd5eaf96ac0a01a30a5e9b02d4aaa0e2358700d1c

100 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The sample is an Excel file containing Excel 4.0 macros. It uses a common lure to trick users into enabling macros. The Auto_Open macro executes a command to download a second-stage payload from the URL http://87.251.86.178/pp/oo.html. The command itself is obfuscated using character escaping.

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` `c5aad075e50422dc1116ac70939d41e0371d46cf42a38ecf99b5202042a44db6`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	1374 bytes

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