Office (OLE) / .XLS malware analysis — malicious · af319cc35623e05f

MALICIOUS

Office (OLE) / .XLS

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

MD5: 31758531c8ed603dd3ba3854133b425c SHA-1: c6f470d2e5528a44e8b584e94dbaf98ec690eab7 SHA-256: af319cc35623e05f841b9c6741cbefd51126394f72fd93fc271eae31a020a235

102 Risk Score

Malware Insights

MITRE ATT&CK

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

The presence of Excel 4.0 macros, specifically an Auto_Open defined name, indicates that the document is designed to execute code upon opening. The heuristic 'SE_ENABLE_LURE' suggests the document attempts to trick the user into enabling macros. The embedded URLs likely serve as download locations for further malicious payloads. The XLM macros are too complex to fully analyze statically, but their presence and the lure technique strongly suggest a downloader or droppper functionality.

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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