Office (OLE) / .XLSX malware analysis — malicious · e9beb989ce96f33a

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 9385af27fb1c77b1f315f26a05cdb0c5 SHA-1: 12eeabfc15e4caa6f5586f9ff11753a999f23fb9 SHA-256: e9beb989ce96f33a5b5174bd7f6ceec7375eac3280ae3b8f4412ea7191ac4dd8

100 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1204.002 Malicious File

The sample contains Excel 4.0 macros with an Auto_Open entry, indicating an attempt to automatically execute code upon opening. A heuristic also detected a "content-enable lure" designed to trick users into enabling macros. The extracted URL 'http://wyhfi19vkwt03hcrle.xyz/apple.gif' is likely used to download a secondary 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` `c2dc2d27a90e87fdcc044c59aed45fe776e1b180d63fa23ffc4ef09a815d1305`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	4016 bytes

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