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

Static analysis result for SHA-256 78dc7b7475fda91e…

MALICIOUS

Office (OLE) / .XLS

267.5 KB Created: 2020-09-14 21:28:14 Authoring application: Microsoft Excel
MD5: 45d6724e12b54092a46c8b8cf57bb316 SHA-1: ab41e637f4bbdf17beb50f4b67b7293aec162737 SHA-256: 78dc7b7475fda91e1d378073404fe0dc0ee3b63054ddfe9a68c4bf79958dcbe6
60 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.005 Visual Basic

The sample is an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. This type of file is commonly used to deliver malicious payloads via spearphishing attachments. The encrypted nature and lack of readable document body text suggest the primary purpose is to obfuscate the malicious content, likely a downloader or droppper. No specific IOCs were extracted from the provided evidence.

Heuristics 2

  • Encrypted Excel 4.0 macro sheet high OLE_XLM_ENCRYPTED_MACROSHEET
    Workbook contains an Excel 4.0 macro sheet and BIFF FILEPASS encryption. Password-protected XLM macro sheets, especially the default Excel password path, are a common malware evasion pattern because static formula extraction may fail until the workbook is decrypted.
  • 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.

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