Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c1529e245e09c365…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:30:04 Authoring application: Microsoft Excel First seen: 2021-11-02
MD5: 4464782785e0feb4d33eaba40d655f67 SHA-1: 1c65f3396eb2300a6ad0fe5f5b8b81ac8b56a21a SHA-256: c1529e245e09c36589c01252fa39a432671aaf17ba455c6682617c743c15c150
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 sheet that contains an Auto_Open defined name, indicating it will execute automatically upon opening. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code, likely downloading and running a second-stage payload. No specific family could be identified from the available evidence.

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) 6530 bytes
SHA-256: 517c7880b5503afac6fad22e305729f1f5aa4d97b26c5257d216680ab2372724
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 -  vjtNzqhx
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G165 
' 0018     23 LABEL : Cell Value, String Constant - BkUrqOEg len=0 
' 0018     25 LABEL : Cell Value, String Constant - csiziCttqe len=0 
' 0018     21 LABEL : Cell Value, String Constant - dbGRUh len=0 
' 0018     23 LABEL : Cell Value, String Constant - fzXSFyLE len=0 
' 0018     27 LABEL : Cell Value, String Constant - HnoFnzqbBMYh len=0 
' 0018     20 LABEL : Cell Value, String Constant - IJYdU len=0 
' 0018     25 LABEL : Cell Value, String Constant - iyLECUtBJH len=0 
' 0018     22 LABEL : Cell Value, String Constant - JgRRMOv len=0 
' 0018     26 LABEL : Cell Value, String Constant - NONpzNTUeWd len=0 
' 0018     22 LABEL : Cell Value, String Constant - oAnnKBL len=0 
' 0018     24 LABEL : Cell Value, String Constant - ozTfhhSZf len=0 
' 0018     27 LABEL : Cell Value, String Constant - QPmamXrhjfWF len=0 
' 0018     25 LABEL : Cell Value, String Constant - svQGmLUVCK len=0 
' 0018     20 LABEL : Cell Value, String Constant - SWZHz len=0 
' 0018     24 LABEL : Cell Value, String Constant - TcOmlfupn len=0 
' 0018     25 LABEL : Cell Value, String Constant - xJpESvHiWI len=0 
' 0018     26 LABEL : Cell Value, String Constant - XNUcnTHTVxe len=0 
' 0018     20 LABEL : Cell Value, String Constant - YGhMe len=0 
' 0018     23 LABEL : Cell Value, String Constant - yYtdnHVd len=0 
' 0018     20 LABEL : Cell Value, String Constant - zSpzg 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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