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

Static analysis result for SHA-256 a9afda71873ee86b…

MALICIOUS

Office (OLE) / .XLS

86.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 9cfef46aa1d6b9db8ef90909af74d2e2 SHA-1: bc823146f8316a7fc0ada32c5e592af3ff5c5b94 SHA-256: a9afda71873ee86bf2e388c9d1710f2338e15005eebd248d278a9a97dd9e62bf
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1059.001 PowerShell T1059.003 Windows Command Shell

The sample is an Excel 4.0 macro-enabled spreadsheet. It contains an Auto_Open macro that is configured to execute dangerous functions, specifically the RUN function. The macro attempts to download a file from the URL 'http://etysu02scnabr03wzaxue.com/index.xls' and execute it using 'rundll32 ..\Ihjsazcx.rke'. This indicates a downloader or dropper functionality.

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
f0b3c761745801c4514325e5e2172ffa464d54cbc3181e4812c1f84ed7c0fede		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 2473 bytes

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