Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 795c9ed3c8e66d87…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:27:35 Authoring application: Microsoft Excel First seen: 2021-07-10
MD5: 0dc6da749af91bd64afaa7af6bd16ad1 SHA-1: 60e79090bc2d341ba056c76938f08e51d3d1cc66 SHA-256: 795c9ed3c8e66d87b1df37be50aa0fd385da66181b9c3f90f218bfc3b2d18c4b
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled workbook. Static analysis detected an Auto_Open defined name and the use of dangerous formula APIs within the XLM macro sheet, indicating an attempt to automatically execute code upon opening. The specific function used, RUN, suggests it likely attempts to execute a command or payload.

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) 6658 bytes
SHA-256: 7ab6d594af95b69ea8324a9f7a6310baffb64c4ac89a222e4355fd9cb30ccb79
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  elKiUubLAvS
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F173 
' 0018     24 LABEL : Cell Value, String Constant - BaLkNBeNK len=0 
' 0018     27 LABEL : Cell Value, String Constant - CrBZnIaOdlOc len=0 
' 0018     22 LABEL : Cell Value, String Constant - DFEGBjO len=0 
' 0018     20 LABEL : Cell Value, String Constant - EsFhC len=0 
' 0018     27 LABEL : Cell Value, String Constant - fXpiVquhDrwG len=0 
' 0018     27 LABEL : Cell Value, String Constant - lcehbHxoYBxp len=0 
' 0018     25 LABEL : Cell Value, String Constant - LlxLnOvclK len=0 
' 0018     21 LABEL : Cell Value, String Constant - LZXuLA len=0 
' 0018     21 LABEL : Cell Value, String Constant - PsmPTS len=0 
' 0018     24 LABEL : Cell Value, String Constant - QCfOKkogK len=0 
' 0018     25 LABEL : Cell Value, String Constant - SrxVNoyfCx len=0 
' 0018     22 LABEL : Cell Value, String Constant - SyzgTLg len=0 
' 0018     26 LABEL : Cell Value, String Constant - ubnCBELyJjU len=0 
' 0018     25 LABEL : Cell Value, String Constant - vgnsxxUsZy len=0 
' 0018     24 LABEL : Cell Value, String Constant - WeFItbKNd len=0 
' 0018     27 LABEL : Cell Value, String Constant - wrBjPuQXuuNB len=0 
' 0018     21 LABEL : Cell Value, String Constant - WstEYw len=0 
' 0018     20 LABEL : Cell Value, String Constant - xIbHh len=0 
' 0018     25 LABEL : Cell Value, String Constant - XYkZthkZzY len=0 
' 0018     20 LABEL : Cell Value, String Constant - zfxuP 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
' 
... (truncated)

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