Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0e386a83235dd53d…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:49 Authoring application: Microsoft Excel First seen: 2021-06-28
MD5: e14e12cb6b988138e2b23f43c510827c SHA-1: 44e69f8082b03f098500b7eb6326c4e1d247eb25 SHA-256: 0e386a83235dd53d1fd3750712097d0fde791adad8c1106e91652e85d1f461a0
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. Static analysis detected an Auto_Open defined name, indicating that the macro will execute automatically when the workbook is opened. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary commands, likely to download and run a second-stage 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) 6800 bytes
SHA-256: 82a20e601577cf1011fb5581a0636b7a49b3d20b902d5a91d89c36a6b479398a
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 -  myiBaNuUZ
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A152 
' 0018     27 LABEL : Cell Value, String Constant - BYdzlAUSsegm len=0 
' 0018     25 LABEL : Cell Value, String Constant - cqqsJcXjyX len=0 
' 0018     27 LABEL : Cell Value, String Constant - cZTuRjUYCIqc len=0 
' 0018     21 LABEL : Cell Value, String Constant - gQfxii len=0 
' 0018     21 LABEL : Cell Value, String Constant - IOljBx len=0 
' 0018     27 LABEL : Cell Value, String Constant - LNWLqksRHHSz len=0 
' 0018     22 LABEL : Cell Value, String Constant - MGUOQpd len=0 
' 0018     27 LABEL : Cell Value, String Constant - mpoFaGnjkLOB len=0 
' 0018     24 LABEL : Cell Value, String Constant - MQvXNpbPu len=0 
' 0018     26 LABEL : Cell Value, String Constant - NpfnJhYyhLW len=0 
' 0018     24 LABEL : Cell Value, String Constant - qrCCNMNGB len=0 
' 0018     21 LABEL : Cell Value, String Constant - RRYPlD len=0 
' 0018     20 LABEL : Cell Value, String Constant - rZWcn len=0 
' 0018     24 LABEL : Cell Value, String Constant - szoWPPvtX len=0 
' 0018     25 LABEL : Cell Value, String Constant - tjJqgSIDZA len=0 
' 0018     25 LABEL : Cell Value, String Constant - xAGAPaVdBq len=0 
' 0018     21 LABEL : Cell Value, String Constant - xjaybG len=0 
' 0018     22 LABEL : Cell Value, String Constant - yGohITK len=0 
' 0018     22 LABEL : Cell Value, String Constant - YISwjBR len=0 
' 0018     20 LABEL : Cell Value, String Constant - zkbpn 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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