Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8abe0f2c1d156634…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:39:56 Authoring application: Microsoft Excel First seen: 2021-06-28
MD5: 15d8066af047f95e3ce08ba367590bb5 SHA-1: 00099f1f56dc44f5f1e7c05afe261737ae18b348 SHA-256: 8abe0f2c1d1566348cfdb95da9cca7e1b8242f49048f8d12a8b8ff9666ef94a3
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

This Excel file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a known technique for executing malicious code upon opening the document. The critical heuristic firings indicate the presence of dangerous formula APIs within the macro sheet, suggesting it's designed to run commands. No specific family could be identified, but the technique is indicative of a macro-based malware loader.

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 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6817 bytes
SHA-256: 22fa9cf161438bc058f894612b0c4f879ceb7e2ea5bab93a62b48b75a06327c2
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  QhePpUfkN
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D132 
' 0018     22 LABEL : Cell Value, String Constant - BKTwZBh len=0 
' 0018     24 LABEL : Cell Value, String Constant - brCOrZQyx len=0 
' 0018     26 LABEL : Cell Value, String Constant - DAhNTQPASWX len=0 
' 0018     20 LABEL : Cell Value, String Constant - dJlgz len=0 
' 0018     21 LABEL : Cell Value, String Constant - Epuqmc len=0 
' 0018     26 LABEL : Cell Value, String Constant - gwhkUCmMSIM len=0 
' 0018     27 LABEL : Cell Value, String Constant - hqEBEQAPpoLl len=0 
' 0018     25 LABEL : Cell Value, String Constant - HZiedaoEOh len=0 
' 0018     22 LABEL : Cell Value, String Constant - nGyVzCd len=0 
' 0018     24 LABEL : Cell Value, String Constant - OChPreGOk len=0 
' 0018     20 LABEL : Cell Value, String Constant - pvdVJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - qAcgSgowk len=0 
' 0018     22 LABEL : Cell Value, String Constant - rgTxWLC len=0 
' 0018     21 LABEL : Cell Value, String Constant - rqduaK len=0 
' 0018     20 LABEL : Cell Value, String Constant - sCRHb len=0 
' 0018     25 LABEL : Cell Value, String Constant - TlRILIfAUu len=0 
' 0018     26 LABEL : Cell Value, String Constant - WyQkvhJddwr len=0 
' 0018     22 LABEL : Cell Value, String Constant - XMaENLH len=0 
' 0018     22 LABEL : Cell Value, String Constant - XVVKhTK len=0 
' 0018     22 LABEL : Cell Value, String Constant - YhjtLAd len=0 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LA
... (truncated)

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