Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e406bb0ce61febbe…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:46:25 Authoring application: Microsoft Excel First seen: 2021-10-23
MD5: 11260b3cb76a7e891211c3e22022005b SHA-1: bd4a3ecfcf42cc64f5af270c77056a721e5f4df5 SHA-256: e406bb0ce61febbe96240ed4468be7893d17080d7b57ed9548768dceeb307054
140 Risk Score

Malware Insights

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

This Excel file contains Excel 4.0 (XLM) macros, specifically an Auto_Open defined name, which is a known method for executing malicious code upon opening the workbook. The critical heuristic firings indicate the presence of dangerous formula APIs within the Auto_Open macro, suggesting it's designed to run arbitrary commands. No specific URLs or further payloads were extracted, but the mechanism points to a downloader or initial execution stage.

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) 6528 bytes
SHA-256: aa954303b6a600f31fd21c736af2d4d4d224d7d159797eecfd551342bc9251d2
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  REmdZX
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D138 
' 0018     25 LABEL : Cell Value, String Constant - bjCuzEzFOa len=0 
' 0018     27 LABEL : Cell Value, String Constant - bVspKTfRvwpi len=0 
' 0018     26 LABEL : Cell Value, String Constant - doOgikckgjl len=0 
' 0018     20 LABEL : Cell Value, String Constant - HzfUe len=0 
' 0018     27 LABEL : Cell Value, String Constant - JKDUKAPfkaqR len=0 
' 0018     24 LABEL : Cell Value, String Constant - kmmWDfouB len=0 
' 0018     26 LABEL : Cell Value, String Constant - knuANRvMuxA len=0 
' 0018     20 LABEL : Cell Value, String Constant - lLeRG len=0 
' 0018     25 LABEL : Cell Value, String Constant - NYWlgYsULT len=0 
' 0018     24 LABEL : Cell Value, String Constant - nzTNRrCix len=0 
' 0018     22 LABEL : Cell Value, String Constant - PCFpKcc len=0 
' 0018     20 LABEL : Cell Value, String Constant - pGljj len=0 
' 0018     27 LABEL : Cell Value, String Constant - PXwYLLNalgOj len=0 
' 0018     27 LABEL : Cell Value, String Constant - qLaRAYCNbgOW len=0 
' 0018     24 LABEL : Cell Value, String Constant - RArIgeLkZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - sdAoDr len=0 
' 0018     27 LABEL : Cell Value, String Constant - SertrmsIYgMq len=0 
' 0018     25 LABEL : Cell Value, String Constant - TcONOmXQbl len=0 
' 0018     27 LABEL : Cell Value, String Constant - XQSjIXoSismk len=0 
' 0018     23 LABEL : Cell Value, String Constant - yAdgjRYb 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 Constan
... (truncated)

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