Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e7e81ddeaf9430b7…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:47:38 Authoring application: Microsoft Excel First seen: 2021-09-23
MD5: 87f937f942f19ae7940b063c691e4be2 SHA-1: c6fad9ddfe9021d6f1f288fbf5ced16b40505ce3 SHA-256: e7e81ddeaf9430b73b2406facd8cc152592dd087bcaf76a72adb5ab888b8e620
140 Risk Score

Malware Insights

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

The file is an Excel document containing Excel 4.0 (XLM) macros, specifically an Auto_Open defined name. This indicates an attempt to automatically execute code upon opening the workbook. The presence of dangerous formula APIs like RUN suggests the macro is designed to download and execute 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) 6704 bytes
SHA-256: 86a57ac9b52ff7233fa0524da08f4abbf6279ec5a5fc2eaaa8478e72d9ffcfff
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  skth
' 0018     21 LABEL : Cell Value, String Constant - aQbueM len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H136 
' 0018     24 LABEL : Cell Value, String Constant - GDolMPpvN len=0 
' 0018     26 LABEL : Cell Value, String Constant - HCgzyAfMowD len=0 
' 0018     22 LABEL : Cell Value, String Constant - hEodRiS len=0 
' 0018     21 LABEL : Cell Value, String Constant - HLKsRW len=0 
' 0018     26 LABEL : Cell Value, String Constant - hxXBQhFVxyA len=0 
' 0018     24 LABEL : Cell Value, String Constant - JSgttXvtX len=0 
' 0018     25 LABEL : Cell Value, String Constant - KEYQzZXaRq len=0 
' 0018     22 LABEL : Cell Value, String Constant - kntOLXJ len=0 
' 0018     22 LABEL : Cell Value, String Constant - LALTrMb len=0 
' 0018     27 LABEL : Cell Value, String Constant - lOQWsOhuoObu len=0 
' 0018     20 LABEL : Cell Value, String Constant - lujfx len=0 
' 0018     22 LABEL : Cell Value, String Constant - mmNOuoa len=0 
' 0018     23 LABEL : Cell Value, String Constant - QBmcZtzU len=0 
' 0018     23 LABEL : Cell Value, String Constant - QGihFoyE len=0 
' 0018     24 LABEL : Cell Value, String Constant - twZJmcfHo len=0 
' 0018     24 LABEL : Cell Value, String Constant - UGazZdEES len=0 
' 0018     26 LABEL : Cell Value, String Constant - VSXeEWDWfYZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - VYShWNhLSrro len=0 
' 0018     25 LABEL : Cell Value, String Constant - xiJIJMahaq 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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