Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7064411cb577229e…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:25 Authoring application: Microsoft Excel First seen: 2021-10-01
MD5: 29c218efb587f271517ac7a5c5b9d32d SHA-1: 18f02ab34e5d6ae390be60656e1f0de9862d0475 SHA-256: 7064411cb577229e75b520e23bf0da43fed2f521666bdc3aebe3f92955a97044
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 detected with critical heuristics for Auto_Open functionality and the use of dangerous formula APIs like RUN. This indicates the workbook is designed to automatically execute code upon opening, a common technique for delivering malware. No specific URLs or hashes were extracted, but the presence of the Auto_Open macro strongly suggests 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) 6744 bytes
SHA-256: bf043062d7ab8e23b43505ed813912341591b7b48d2fc3b08f31a5a6e486d8ae
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  mSOUsNvG
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F179 
' 0018     22 LABEL : Cell Value, String Constant - CpTxyNF len=0 
' 0018     26 LABEL : Cell Value, String Constant - CuvpXLiEnYO len=0 
' 0018     21 LABEL : Cell Value, String Constant - EDfVKW len=0 
' 0018     26 LABEL : Cell Value, String Constant - EPVnZhDGqTN len=0 
' 0018     26 LABEL : Cell Value, String Constant - EzzBJuuNEOm len=0 
' 0018     21 LABEL : Cell Value, String Constant - gJWKtD len=0 
' 0018     26 LABEL : Cell Value, String Constant - IqVdYkXjpjS len=0 
' 0018     24 LABEL : Cell Value, String Constant - IXWppaaAo len=0 
' 0018     24 LABEL : Cell Value, String Constant - JKQkRUjaL len=0 
' 0018     20 LABEL : Cell Value, String Constant - JxjAK len=0 
' 0018     20 LABEL : Cell Value, String Constant - keIAV len=0 
' 0018     25 LABEL : Cell Value, String Constant - mdKinvSlnO len=0 
' 0018     26 LABEL : Cell Value, String Constant - MkPTqVmEHEk len=0 
' 0018     23 LABEL : Cell Value, String Constant - nRUzseqn len=0 
' 0018     25 LABEL : Cell Value, String Constant - osHTZYSGBf len=0 
' 0018     21 LABEL : Cell Value, String Constant - TfYoTy len=0 
' 0018     23 LABEL : Cell Value, String Constant - wNKsmmtS len=0 
' 0018     20 LABEL : Cell Value, String Constant - XFrad len=0 
' 0018     22 LABEL : Cell Value, String Constant - XzMHRmd len=0 
' 0018     26 LABEL : Cell Value, String Constant - zGqREZtEPkG 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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