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

Static analysis result for SHA-256 00dc4a65067cb0b6…

MALICIOUS

Office (OLE) / .XLS

70.5 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-06-07
MD5: 71046b7a93c419da3b94dad411a15b39 SHA-1: 68a8a660e4375223488e07797a9d5d412c9615f3 SHA-256: 00dc4a65067cb0b64b0b6ac5004bcb4f73bb34a2ab1560fcd9a86ae603fc5560
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File

The critical OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN heuristics indicate the presence of an Excel 4.0 macro sheet with an Auto_Open entry that utilizes dangerous functions like RUN. This suggests the macro is designed to automatically execute code upon opening the spreadsheet. The extracted URLs are likely destinations for downloading additional malicious content.

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
b2124f09a0fec7faeef42f88c68da164b6a9b84efed16f528c7ac11c7695b4b9		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 7646 bytes

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