Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e59b84cf31d2c668…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:42:03 Authoring application: Microsoft Excel First seen: 2021-06-20
MD5: 4c499ffbbf4065a351d39352e3c03215 SHA-1: 7a4280ef9ca00fd6eaabbefd263b0fa8348e6975 SHA-256: e59b84cf31d2c6687ea603fc4ee9fea49dd569c5495cfd4b8ecd8efb52876c39
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 activity. This technique allows for the execution of arbitrary code upon opening the document, likely to download and run a secondary payload. The presence of dangerous formula APIs further increases the risk.

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) 6526 bytes
SHA-256: fcd4bf1163c54080be9dbaecf5890136febc73c1e07bbb6c855e3e0246604b6f
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  hizqNdR
' 0018     27 LABEL : Cell Value, String Constant - asTBaxKUqNKH len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A187 
' 0018     21 LABEL : Cell Value, String Constant - BQwQIb len=0 
' 0018     25 LABEL : Cell Value, String Constant - cYdRVYhNOz len=0 
' 0018     25 LABEL : Cell Value, String Constant - dBUwagFBLC len=0 
' 0018     27 LABEL : Cell Value, String Constant - DHcUqfITTTuP len=0 
' 0018     24 LABEL : Cell Value, String Constant - DLScqzbGj len=0 
' 0018     27 LABEL : Cell Value, String Constant - eOrtbEGuhplI len=0 
' 0018     22 LABEL : Cell Value, String Constant - GHodAgu len=0 
' 0018     22 LABEL : Cell Value, String Constant - iMrLWCf len=0 
' 0018     22 LABEL : Cell Value, String Constant - kPOBIfY len=0 
' 0018     22 LABEL : Cell Value, String Constant - LiTWfQI len=0 
' 0018     25 LABEL : Cell Value, String Constant - mhsOYzfRGB len=0 
' 0018     25 LABEL : Cell Value, String Constant - MvGSLTHDWC len=0 
' 0018     25 LABEL : Cell Value, String Constant - oEOwutRNbS len=0 
' 0018     24 LABEL : Cell Value, String Constant - QewxJGasY len=0 
' 0018     20 LABEL : Cell Value, String Constant - sKlnt len=0 
' 0018     20 LABEL : Cell Value, String Constant - tiVTO len=0 
' 0018     23 LABEL : Cell Value, String Constant - wgMuKAME len=0 
' 0018     24 LABEL : Cell Value, String Constant - WwaevnpcK len=0 
' 0018     22 LABEL : Cell Value, String Constant - ySaQuyd 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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