Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 d637c5819791ddef…

MALICIOUS

Office (OLE) / .XLS

380.5 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel
MD5: 51af0867c25ede0bf4d588446f9cb15f SHA-1: c832b2f0a369729333ffaa432515a7e4f0ebd21a SHA-256: d637c5819791ddef045822eac44fd3830bfc3d838f8fe40ad62a1fa4f8ece5b3
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 an attempt to automatically execute code upon opening the workbook. The embedded URLs and the 'Enable Lure' heuristic suggest the document is designed to trick the user into enabling macros, which would then likely trigger the execution of a payload from one of the provided URLs. The XLM macros appear to contain functions for downloading and executing files, such as 'File.DownloadFile' and 'run.dll32'.

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.

FilenameKindSourceSize
xlm_macros.txt
13ea4a1fd330f9266fa91027043baa61f334e3ac691e10ce14b7c7fee97c551c		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 8812 bytes

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