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

Static analysis result for SHA-256 04ee61f1184be78d…

MALICIOUS

Office (OLE) / .XLS

229.0 KB Created: 2020-09-20 21:17:44
MD5: 2e0819723d50d0b6a2e6ffdb33778e40 SHA-1: 329d002fc53f93e92b99dfbc5937412b40fccf93 SHA-256: 04ee61f1184be78db3fd78821306e0b81e6dfaff17f6019d76e69237d6133b6a
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample contains Excel 4.0 macros, specifically an Auto_Open macro, which is a critical finding. The macro uses the EXEC function to run a PowerShell command that downloads a file named 'pd.bat' from 'https://cutt.ly/jjfIQ8u' to the temporary directory and then executes it. This indicates a downloader or dropper functionality.

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
5fffc5ca73c10c126eae468e6b87a78462f1d2949dfd982187595123b65c8c51		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1484 bytes

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