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

Static analysis result for SHA-256 fe3b575c23731450…

MALICIOUS

Office (OLE) / .XLS

66.5 KB Created: 2020-09-20 21:17:44
MD5: 093dff0b6f7ad04c3fc99537b255b1cf SHA-1: 539dd2af0f2eba3570711fddf138eb87b052a077 SHA-256: fe3b575c23731450d3886c43443eb208cd4c384c36dda6b2eec187a05ee7ae47
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1027 Obfuscated Files or Information

The sample contains Excel 4.0 macros, specifically an Auto_Open macro, which is a critical finding. The macro executes a PowerShell command that downloads a file named 'eh.exe' from the URL 'https://cutt.ly/Sgjv3UN'. It then moves the downloaded file to the user's AppData directory and executes it. This indicates a downloader functionality aiming to execute a second-stage payload.

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.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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
f54131ea66af3fbb89f8fc9264e9f1ad24c04c3206213c7c6453658fb1129170		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 838 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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