Office (OLE) / .XLS malware analysis — malicious · 939a941ea4c9b8f2

MALICIOUS

Office (OLE) / .XLS

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

MD5: bf087e2391ffa8d90c03886022d33a89 SHA-1: 970c0a3afd8729fdff5cd79350f51cd7c075adad SHA-256: 939a941ea4c9b8f25dc4bce3af46c3f985db806f1f0fc4f4f36dbaced00f3abb

102 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an Excel file containing Excel 4.0 macros, specifically an Auto_Open defined name, which is a strong indicator of malicious intent. The presence of a macro-enable lure further supports this, as it's a common technique to bypass security measures. The embedded URLs are likely used to download and execute a second-stage payload, although the exact nature of the payload cannot be determined from the static analysis alone.

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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