Office (OLE) / .XLS malware analysis — malicious · 96ef6b21cf7915c0

MALICIOUS

Office (OLE) / .XLS

380.5 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel

MD5: a5d99dead50c965e6af70b53b69eef41 SHA-1: b45155a6a73411533f8f0f434bacfecc38802e32 SHA-256: 96ef6b21cf7915c0c33cd43a98b52b52bcaf5a1ed59cb05d7cbffa06de86bf80

102 Risk Score

Malware Insights

MITRE ATT&CK

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

The critical heuristic firing indicates the presence of an Excel 4.0 Auto_Open macro, which is designed to execute automatically upon opening the spreadsheet. This macro likely serves as a downloader, attempting to fetch and execute a payload from one of the embedded URLs. The 'SE_ENABLE_LURE' heuristic further suggests that the document is designed to trick the user into enabling macros, facilitating the execution of the malicious code.

Heuristics 4

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
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — context-specific rules above attribute URLs they actually evaluated; this rule lists URLs that were present in the bytes but were not otherwise tied to a specific finding.
URL https://caiogabriel.com.br/tOKLlSLW/lena.html
- https://bwctradex.com/BcotoLXTr1y/lena.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `d46ad6b52df62d280ddc3eb28f4fdfc78bc84dc99077b9aa50809affc4be6057`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	8812 bytes

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