Office (OLE) / .XLSX malware analysis — malicious · a5becaa42516c8fd

MALICIOUS

Office (OLE) / .XLSX

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

MD5: da51d83688d9c27ab489b19ea250fb0a SHA-1: 6576a26b77a077ed6433267f98f2a3ac9ef5c74a SHA-256: a5becaa42516c8fdc61c87ca91dc0697a76ee8b32ad90f5f17f56fa118a41aac

100 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The sample contains Excel 4.0 macros, specifically an Auto_Open entry, which is a strong indicator of malicious intent. The document body presents a 'Docu Sign' lure, instructing the user to enable macros, a common technique to bypass security. The embedded URL 'http://wyhfi19vkwt03hcrle.xyz/apple.gif' is likely used to download and execute 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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