Office (OLE) / .XLSX malware analysis — malicious · 9880d80b43d500f2

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 3a9d6a67c8896f73fd2a537351b58636 SHA-1: bffd403661792a7e5c85a74c67eb3a5dab1d13cf SHA-256: 9880d80b43d500f234718af7c6c12f3a52cabfc349863b169393378931c7cbb5

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 automatic execution upon opening. It also includes a 'Macro/content-enable lure' heuristic, suggesting the document prompts the user to enable macros. The embedded URL 'http://wit19refyn03rokplj.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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