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

Static analysis result for SHA-256 811d073c785ca809…

MALICIOUS

Office (OLE) / .XLS

45.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 228a62e88dcbcd67e985bde4ff8aa75a SHA-1: 221a0e2e297ec49dfedf286575637fbd9b9837f1 SHA-256: 811d073c785ca80960dd60b0d46abb47bee720875fb367e3c1be8d64df4567f3
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1059.001 PowerShell T1204.002 Malicious File

The file is an Excel 4.0 macro-enabled spreadsheet. Heuristics indicate the presence of an Auto_Open macro and the use of dangerous functions like RUN, suggesting it's designed to execute arbitrary code upon opening. The macro sheet name 'UPWLODvbHMu' is also extracted as a potential indicator. The document body contains heavily obfuscated text, which is typical for macro-based malware attempting to hide its true intent.

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.
  • XLM Auto_Open environment-evasion HALT gate high OLE_XLM_ENVIRONMENT_EVASION_HALT
    Excel 4.0 macro sheet auto-executes multiple GET.WORKSPACE / GET.WINDOW environment checks and halts execution when the host does not match the expected user environment. This is a common sandbox-evasion pattern in XLM malware and is stronger than a bare XLM macro-sheet indicator.
  • 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
260a5dbe77958fd6de314deb989d85b53852fb77631aef8d7b712e00f5606c26		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 13461 bytes

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