Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fa01cdb310d417d4…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:46:50 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 7ea5674c5444ce97217e24468df4c5dc SHA-1: 072585a59b0a33776f9a3f8db8245e3be336ee3e SHA-256: fa01cdb310d417d451af5cbe0b3eafd9702852b3edbfeee737b0e1b137b7167b
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical indicator of malicious intent. This technique is commonly used to execute arbitrary code upon opening the workbook, typically to download and run 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) 6883 bytes
SHA-256: 78366575b2eadcdac4d46a6e0f94380b87125f23397b789499fd07906588d2c0
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 -  FnwnQjDdMyg
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E178 
' 0018     20 LABEL : Cell Value, String Constant - aWMTN len=0 
' 0018     25 LABEL : Cell Value, String Constant - CmbrPxPvJW len=0 
' 0018     25 LABEL : Cell Value, String Constant - CoEWzUgCTj len=0 
' 0018     25 LABEL : Cell Value, String Constant - eoRxuAONSP len=0 
' 0018     24 LABEL : Cell Value, String Constant - KinYAZzxX len=0 
' 0018     21 LABEL : Cell Value, String Constant - mrTNJf len=0 
' 0018     25 LABEL : Cell Value, String Constant - mvPOlNnCTt len=0 
' 0018     25 LABEL : Cell Value, String Constant - nDxYogswaJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - NnTqpeaaM len=0 
' 0018     25 LABEL : Cell Value, String Constant - phrlIJFdYw len=0 
' 0018     20 LABEL : Cell Value, String Constant - QvFtU len=0 
' 0018     24 LABEL : Cell Value, String Constant - rGdwedtjS len=0 
' 0018     26 LABEL : Cell Value, String Constant - tIuiBAETuDr len=0 
' 0018     23 LABEL : Cell Value, String Constant - TLxxRplg len=0 
' 0018     23 LABEL : Cell Value, String Constant - TQXuPfQF len=0 
' 0018     22 LABEL : Cell Value, String Constant - tUnioOx len=0 
' 0018     25 LABEL : Cell Value, String Constant - ubRdXkYToL len=0 
' 0018     26 LABEL : Cell Value, String Constant - vApovkjRgSE len=0 
' 0018     25 LABEL : Cell Value, String Constant - whsJCEQNeT len=0 
' 0018     20 LABEL : Cell Value, String Constant - wVuYY 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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