Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8e9341ab233fca96…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:38:03 Authoring application: Microsoft Excel First seen: 2021-10-05
MD5: f28f6ab6fc82e53e5546076bcea52e66 SHA-1: d7e9abfdc195a72ec53b7d8a62d38e7824c0d4ea SHA-256: 8e9341ab233fca963397eb5edb84491d38e37c0966c5fcc387416d8581d5954b
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 containing an Auto_Open function, which is a critical indicator of malicious intent. This function is designed to execute automatically when the workbook is opened, likely to download and execute a secondary payload. The presence of dangerous formula APIs further supports this assessment.

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) 6784 bytes
SHA-256: 72f178a0c23cf3996ab541ee60923ccb9feeceaa971b253d88e7fdbbafece103
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 -  WsSdOAIvo
' 0018     23 LABEL : Cell Value, String Constant - aauaHWnQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D145 
' 0018     23 LABEL : Cell Value, String Constant - CsAfBgeO len=0 
' 0018     20 LABEL : Cell Value, String Constant - eIaxq len=0 
' 0018     27 LABEL : Cell Value, String Constant - eKvQadQuikjR len=0 
' 0018     24 LABEL : Cell Value, String Constant - gPesWSiNk len=0 
' 0018     21 LABEL : Cell Value, String Constant - HLngDC len=0 
' 0018     26 LABEL : Cell Value, String Constant - IBcIZVfaHMR len=0 
' 0018     26 LABEL : Cell Value, String Constant - jTGsRWZuUPL len=0 
' 0018     24 LABEL : Cell Value, String Constant - kqBxOUdyt len=0 
' 0018     21 LABEL : Cell Value, String Constant - kRKIQc len=0 
' 0018     22 LABEL : Cell Value, String Constant - LcqFLUx len=0 
' 0018     23 LABEL : Cell Value, String Constant - LismiJXK len=0 
' 0018     21 LABEL : Cell Value, String Constant - mevbbS len=0 
' 0018     27 LABEL : Cell Value, String Constant - nRZdGRNnOBVF len=0 
' 0018     25 LABEL : Cell Value, String Constant - PutPQPZuXW len=0 
' 0018     25 LABEL : Cell Value, String Constant - RUMvUTVpIC len=0 
' 0018     23 LABEL : Cell Value, String Constant - usADmJsS len=0 
' 0018     24 LABEL : Cell Value, String Constant - UsrwXvMtX len=0 
' 0018     21 LABEL : Cell Value, String Constant - xiAJje len=0 
' 0018     21 LABEL : Cell Value, String Constant - XReyez 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    
... (truncated)

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