Office (OLE) / .XLS malware analysis — malicious · eda190381a740fb2

MALICIOUS

Office (OLE) / .XLS

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

MD5: 5f541baa35336bd02749a61493b951b9 SHA-1: 21a024fb63a3b087e67f3f16be63a0a420f3de0d SHA-256: eda190381a740fb2113db1c7f4d30441e817a59abbeab6f04c1d476522224835

102 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an Excel 4.0 (XLM) macro-enabled spreadsheet. It contains an Auto_Open defined name, indicating that macros will execute automatically upon opening. The document body contains obfuscated text that includes URLs and what appear to be macro commands for downloading and executing files, such as 'downloadFile' and 'run'. The presence of an 'enable lure' heuristic further suggests the document is designed to trick users into enabling macros. The extracted URLs are likely used to host the second-stage payload.

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://thedeformo.com/zrbLAqMKy21Y/lena.html
- https://faithfulroofingco.com/nmsY1dCNaBRO/lena.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `13ea4a1fd330f9266fa91027043baa61f334e3ac691e10ce14b7c7fee97c551c`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	8812 bytes

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