Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 be0ad6b198b68e8e…

MALICIOUS

Office (OLE)

221.5 KB Created: 2021-02-06 22:23:31 Authoring application: Microsoft Excel
MD5: 96b28438802f1d939d889732e45e8651 SHA-1: b004826807e15afc0cfc770f1373e13500d598bb SHA-256: be0ad6b198b68e8eb770d158c2f378a2adb72f832ab52378a1b209182b396cee
140 Risk Score

Malware Insights

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

The sample contains Excel 4.0 macros, specifically an Auto_Open macro, which is a critical finding. The macro constructs and executes a PowerShell command to download a file from 'https://rebrand.ly/ju97nsc' and save it as 'de.exe' in the user's AppData directory, subsequently executing it. This indicates a downloader or droppper 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
7dc84206699698846eaf8d8c03da992635e2b2f5763b0ff4381616d2d2c67718		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1240 bytes

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