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

Static analysis result for SHA-256 8b1cc33dce582e63…

MALICIOUS

Office (OLE) / .XLS

70.5 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-06-07
MD5: e3f2a3bc0a73d2c068063638bb0f34f1 SHA-1: d42b939a2cb10fcc2c33de90d099e8d5516cbdd7 SHA-256: 8b1cc33dce582e6398097ff7af3f8801a82a9f6009eb009cdf067d32780cfa0e
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File

The file is an Excel 4.0 macro-enabled workbook containing an Auto_Open function. This function is designed to execute automatically when the workbook is opened. The macro attempts to download a payload from one of the listed URLs. The reconstructed URLs are: "http://www.nexxdecor.vn/apk/zy8GkZ/", "http://panscollections.in.th/assets/azHOBDoux/", "https://nationalco-op.org/css/8wv7lB5/", and "https://lightmyfire.in/demo/RIkAfgTFVuaI05r2/".

Heuristics 3

  • 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.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
b4f0a647cf6176132ebc9ecde0dbe63bae14d0fc3c1b3805926fc56fef0b0f6a		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 7650 bytes

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