Office (OLE) / .XLS malware analysis — malicious · e1a517373056f083

MALICIOUS

Office (OLE) / .XLS

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

MD5: 79fca7300978db676dc162445abc2b21 SHA-1: 85ed6ca32d65f4c35c4e5ee76e82ccefd8744015 SHA-256: e1a517373056f0836e422a5b7758a2bf0eff479e753905d2e05201d265f87923

102 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is a Microsoft Excel spreadsheet containing an Excel 4.0 macro sheet with an Auto_Open defined name, indicating automatic execution upon opening. The presence of a macro-enable lure suggests the malware attempts to trick the user into enabling macros. The embedded URLs likely serve as download locations for secondary payloads. The macro execution and lure techniques are strongly indicative of a malicious document.

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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