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

Static analysis result for SHA-256 6afda2d60e7c37fb…

MALICIOUS

Office (OLE) / .XLSX

61.2 KB Created: 2021-12-16 23:53:43 Authoring application: Microsoft Excel
MD5: 40a1e3f75b3f62675f394327431ed493 SHA-1: c69ccbf0b6687d71707f2f87142bfdca5b306b67 SHA-256: 6afda2d60e7c37fb470c77f3b26288a71263ea7b425e559bd50391f0a4f376ee
100 Risk Score

Malware Insights

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

The sample is an Excel file containing Excel 4.0 macros, indicated by the OLE_XLM_AUTOOPEN heuristic. The document body presents a lure to enable editing and content, which is a common tactic for macro-based malware. The extracted XLM macro defines a string that, when executed, constructs and runs the command 'cmd /c msh...'. This command attempts to download a second-stage payload from the URL http://87.251.86.178/pp/oo.html.

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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