Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 09542b49502fcdf0…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:45:08 Authoring application: Microsoft Excel First seen: 2021-09-23
MD5: f24866a9372a9e6d3cb41591a44be16e SHA-1: 4cb37c6fe100ade30503dcc48742ec224c5a948a SHA-256: 09542b49502fcdf062ccc13d9560c3cf03f69f4e9ff35cf156f38e8a973a231f
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 (XLM) macros, specifically an Auto_Open entry, which is a critical finding indicating potential malicious execution. The presence of dangerous formula APIs within the macro sheet further supports this. The macro is designed to execute arbitrary commands upon opening the document.

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) 6991 bytes
SHA-256: 162265da03429b3e8556735ebbd39a574c328865d1c9e8d32fe969199ba36fc5
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 -  BkvHydnrxLR
' 0018     23 LABEL : Cell Value, String Constant - aqDjZwvT len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D189 
' 0018     25 LABEL : Cell Value, String Constant - awYVTKXIqa len=0 
' 0018     27 LABEL : Cell Value, String Constant - bVBBZbHEBvFn len=0 
' 0018     22 LABEL : Cell Value, String Constant - frexrYb len=0 
' 0018     21 LABEL : Cell Value, String Constant - GjNOzf len=0 
' 0018     20 LABEL : Cell Value, String Constant - hWcuq len=0 
' 0018     26 LABEL : Cell Value, String Constant - jXPFkktHMiZ len=0 
' 0018     24 LABEL : Cell Value, String Constant - lmZQyaYxt len=0 
' 0018     26 LABEL : Cell Value, String Constant - MAbtOZbhffc len=0 
' 0018     25 LABEL : Cell Value, String Constant - MzWtNQTFfg len=0 
' 0018     25 LABEL : Cell Value, String Constant - oaoezfyXjg len=0 
' 0018     26 LABEL : Cell Value, String Constant - OdqhmMKzMau len=0 
' 0018     24 LABEL : Cell Value, String Constant - oIeAfIDOc len=0 
' 0018     21 LABEL : Cell Value, String Constant - QBSwab len=0 
' 0018     24 LABEL : Cell Value, String Constant - QLPEsTXxC len=0 
' 0018     26 LABEL : Cell Value, String Constant - qXlEMVANWvs len=0 
' 0018     25 LABEL : Cell Value, String Constant - vANyNMdnLE len=0 
' 0018     27 LABEL : Cell Value, String Constant - wrnbDPwnIOcq len=0 
' 0018     24 LABEL : Cell Value, String Constant - wWMnNpWWo len=0 
' 0018     27 LABEL : Cell Value, String Constant - yWbkiQbvLcFa 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 C
... (truncated)

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