Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d3f60a6a141c6760…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:45:46 Authoring application: Microsoft Excel First seen: 2021-10-23
MD5: 4fcbbe5c308ff6bdd01ad86f493e24a5 SHA-1: 5bfa92497f42cdc8969559eb3b1e8ed12a3e213f SHA-256: d3f60a6a141c67600bf9a6ad60628a12996be415a58ff02d0461788695221235
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 function, which is a known method for executing malicious code. The presence of dangerous formula APIs like RUN indicates an attempt to execute arbitrary commands. The macro sheet is identified as the primary execution vector.

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) 6398 bytes
SHA-256: 90f7021d88c1634e1cc5f2f41f3056931ec2a567b1cf8e3a7f266a199190653e
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  PmQ
' 0018     20 LABEL : Cell Value, String Constant - ASZwu len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C195 
' 0018     23 LABEL : Cell Value, String Constant - cXuEIAQD len=0 
' 0018     26 LABEL : Cell Value, String Constant - ewjRDcyWjyg len=0 
' 0018     26 LABEL : Cell Value, String Constant - fRcIQdFBZos len=0 
' 0018     25 LABEL : Cell Value, String Constant - GUGTYksxwn len=0 
' 0018     20 LABEL : Cell Value, String Constant - iKDGa len=0 
' 0018     21 LABEL : Cell Value, String Constant - KpLojR len=0 
' 0018     21 LABEL : Cell Value, String Constant - llBtIb len=0 
' 0018     25 LABEL : Cell Value, String Constant - LUAJsYFSRN len=0 
' 0018     25 LABEL : Cell Value, String Constant - orzSomJFlv len=0 
' 0018     24 LABEL : Cell Value, String Constant - pBNdauXhw len=0 
' 0018     20 LABEL : Cell Value, String Constant - pGjsB len=0 
' 0018     21 LABEL : Cell Value, String Constant - pIrXHX len=0 
' 0018     22 LABEL : Cell Value, String Constant - RJcFzMa len=0 
' 0018     22 LABEL : Cell Value, String Constant - rwbGbjF len=0 
' 0018     22 LABEL : Cell Value, String Constant - sPACVVM len=0 
' 0018     20 LABEL : Cell Value, String Constant - tmmiz len=0 
' 0018     25 LABEL : Cell Value, String Constant - vzQOITGHIc len=0 
' 0018     27 LABEL : Cell Value, String Constant - XExgGjUPBGoM len=0 
' 0018     20 LABEL : Cell Value, String Constant - XRnyb 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 : Cel
... (truncated)

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