Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d03c658ef99d3df1…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:46:02 Authoring application: Microsoft Excel First seen: 2021-10-12
MD5: a7d1461af6dc634b1d451aab0b7c4e5c SHA-1: 5e1437f080e44fb9974fecded672e1f87b8b1131 SHA-256: d03c658ef99d3df145f4f40f8f3d606e630fc15b9035b11abe7bd5049fb26fbc
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file is an Excel macro-enabled document containing Excel 4.0 (XLM) macros. A critical heuristic identified an Auto_Open defined name, indicating that the macro will execute automatically upon opening the workbook. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute a payload. No specific family could be identified.

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) 6677 bytes
SHA-256: c018cdbbbe79e9b05e9a0c36995f668a84ffe936ad7ed2ab3b63390efd7b163a
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  fqtOIvL
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C140 
' 0018     26 LABEL : Cell Value, String Constant - GBpJsajliIT len=0 
' 0018     20 LABEL : Cell Value, String Constant - Grxty len=0 
' 0018     21 LABEL : Cell Value, String Constant - hKskNB len=0 
' 0018     20 LABEL : Cell Value, String Constant - HQjkV len=0 
' 0018     23 LABEL : Cell Value, String Constant - iCyluVMi len=0 
' 0018     24 LABEL : Cell Value, String Constant - KLAYUNPjZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - QHUPadHx len=0 
' 0018     24 LABEL : Cell Value, String Constant - QuOaoTBmN len=0 
' 0018     27 LABEL : Cell Value, String Constant - RYSjfAENQMmh len=0 
' 0018     21 LABEL : Cell Value, String Constant - SQRsUw len=0 
' 0018     20 LABEL : Cell Value, String Constant - tlBbn len=0 
' 0018     25 LABEL : Cell Value, String Constant - TyUEOsvQxG len=0 
' 0018     27 LABEL : Cell Value, String Constant - UdJDaFmjclti len=0 
' 0018     21 LABEL : Cell Value, String Constant - vCgjyu len=0 
' 0018     26 LABEL : Cell Value, String Constant - VTDJzRGxwUo len=0 
' 0018     20 LABEL : Cell Value, String Constant - vZJYE len=0 
' 0018     25 LABEL : Cell Value, String Constant - WMoDsRDkPw len=0 
' 0018     24 LABEL : Cell Value, String Constant - xTUDbIGwY len=0 
' 0018     20 LABEL : Cell Value, String Constant - zdKVc len=0 
' 0018     20 LABEL : Cell Value, String Constant - zfWAn 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 LABELSST
... (truncated)

Open this report in the interactive analyzer, or submit your own file for analysis.