Office (OLE) / .XLS malware analysis — malicious · 3a40e20fd138cd9b

MALICIOUS

Office (OLE) / .XLS

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

MD5: 4cc4b54efd22626227d6a54e59bfd841 SHA-1: 6456cb90b52e71697a11259a9ab9ee4f6234e6c6 SHA-256: 3a40e20fd138cd9b51f5510d35b7ba2bc09c869110dabe0b37c5e3cde83531bc

102 Risk Score

Malware Insights

MITRE ATT&CK

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

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, indicating an attempt at automatic execution upon opening. It also employs a macro-enable lure to bypass security measures. The embedded URLs likely serve as download locations for secondary payloads. The specific macro content was too large to fully parse, but the presence of Auto_Open and the lure 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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