Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 eda7be91d3a0cb30…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:43:57 Authoring application: Microsoft Excel First seen: 2021-07-10
MD5: 660d8721a28acdaa37ece2a84a5386da SHA-1: 1cdcbd5f5efcade14faec6aa8a2e6616c50bab72 SHA-256: eda7be91d3a0cb308640fda7432c69891b6f1bc92a2b9d0c9eab164ddeb5c8b9
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. The macros are designed to execute automatically when the workbook is opened. The presence of dangerous formula APIs further increases the risk. The document body contains obfuscated text, suggesting an attempt to hide the malicious payload.

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) 6932 bytes
SHA-256: 99c4327632db4ec9d710a8f1d889a0eff153ccc9914d356c6a2b2d04926f3759
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  wuSDidRpc
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D167 
' 0018     25 LABEL : Cell Value, String Constant - BfyWnzvCpK len=0 
' 0018     24 LABEL : Cell Value, String Constant - EjKiaokCz len=0 
' 0018     23 LABEL : Cell Value, String Constant - EzNkTBAB len=0 
' 0018     22 LABEL : Cell Value, String Constant - gHVTChh len=0 
' 0018     26 LABEL : Cell Value, String Constant - gQGuELdCjae len=0 
' 0018     26 LABEL : Cell Value, String Constant - hhExkdKlqvo len=0 
' 0018     23 LABEL : Cell Value, String Constant - HiPWHiDt len=0 
' 0018     25 LABEL : Cell Value, String Constant - IeVZueSeiy len=0 
' 0018     26 LABEL : Cell Value, String Constant - IXlRPgLRvop len=0 
' 0018     25 LABEL : Cell Value, String Constant - JWbkVkOqXP len=0 
' 0018     26 LABEL : Cell Value, String Constant - kADsQyophwh len=0 
' 0018     25 LABEL : Cell Value, String Constant - LmYDWqLvYK len=0 
' 0018     21 LABEL : Cell Value, String Constant - rOmXKt len=0 
' 0018     26 LABEL : Cell Value, String Constant - TBtzzRrSxiD len=0 
' 0018     27 LABEL : Cell Value, String Constant - TyXOZvlDitqZ len=0 
' 0018     26 LABEL : Cell Value, String Constant - uyLqlNdThkl len=0 
' 0018     23 LABEL : Cell Value, String Constant - wamULFsX len=0 
' 0018     24 LABEL : Cell Value, String Constant - YeqooNNkL len=0 
' 0018     25 LABEL : Cell Value, String Constant - yKVjhbAEBi len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZMwfNFKwwRei 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, Str
... (truncated)

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