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

Static analysis result for SHA-256 e4eacfd79ef2edef…

MALICIOUS

Office (OLE) / .XLS

63.0 KB Created: 2020-06-29 06:20:22 Authoring application: Microsoft Excel
MD5: 73a23aaefa1b54888bfe0a5efe0ae004 SHA-1: 6e89d26ce4b54d3a544f47fafd475486ebd739db SHA-256: e4eacfd79ef2edef4356c270093c70773ef808ae810f5a0ebfb321521c9e2b6f
200 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled spreadsheet. Heuristics indicate the presence of an Auto_Open macro that uses dangerous functions, specifically the RUN function. The macro appears to be designed to download a payload from the reconstructed URL 'http://ismeyourfn.gaxCHMw bEKQjTIURLONdlFAJScvGBqzWkVY'. This functionality is consistent with a dropper malware.

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.
  • ClamAV: Xls.Dropper.Agent-8372400-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8372400-0
  • 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
ce196fd7211f995a0f214c1eb12ab2d96b18e3d323815b9500a8297e95c77f59		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 21714 bytes

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