Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 62e44c4f4d2b4104…

MALICIOUS

Office (OLE)

220.5 KB Created: 2020-06-02 02:50:28 Authoring application: Microsoft Excel
MD5: dbc398bc8d33891eac3a43b299f9a8ab SHA-1: 1afcbadbad3a0be7298a53c0739a0da82eaa989c SHA-256: 62e44c4f4d2b4104eef004540415c4a75205dfcd755a890ce44ffa97ebb26517
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file contains Excel 4.0 macros, specifically an Auto_Open function, which is a known technique for executing malicious code. The macro is designed to download a payload from the URL 'http://link.coudwby.msexqRWILMONDaTFACSErgv\B'. The presence of a lure to enable macros further supports its malicious intent as a downloader.

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.
  • 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
2f0b7b8516d5e183ad8da5cb102ce300c4693be9546beb646da328de55792762		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 147269 bytes

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