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

Static analysis result for SHA-256 ba69ddc8ed296916…

MALICIOUS

Office (OLE) / .XLSX

68.0 KB Created: 2019-10-22 07:10:34 Authoring application: Microsoft Excel
MD5: 01b584c25863eac5f6cc02a2ee5e5d76 SHA-1: 17e24ba5fbc3166e316f6be68006ba9ef1d407c9 SHA-256: ba69ddc8ed2969167f904d6cb754e6ae4c791094b3c671ddb19b175b2c709ed8
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1204.002 Malicious File

The sample contains Excel 4.0 macros, specifically an Auto_Open macro that executes a PowerShell command. This command uses a reconstructed string to download and execute a second-stage payload from the URL 'http://paste.ee/r/JaZcX'. The presence of the 'SE_CLIPBOARD_COMMAND_LURE' heuristic suggests the document may also attempt to trick the user into copying and pasting commands.

Heuristics 4

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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
2b085a6db153219a5b0341462dae87f58b73dd570d7193c7ea579c22dad3f835		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 2698 bytes

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