Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 bd1722509d4e45fc…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:42:42 Authoring application: Microsoft Excel First seen: 2021-06-20
MD5: 1792351d66066f1fd3176fc7ad518c67 SHA-1: 446428100c6e98bf67124fb8e2d518dedec84364 SHA-256: bd1722509d4e45fc9f70648e4d18deec0f903a5b1cd16cc903e8f08e14c91620
140 Risk Score

Malware Insights

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

The sample is an Excel file containing Excel 4.0 macros, specifically an Auto_Open function. This indicates an attempt to execute arbitrary code upon opening the document. The presence of dangerous formula APIs further supports this malicious intent. No specific family could be identified.

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) 6869 bytes
SHA-256: fd42ed273ac40885086c39f8ce41f7d01888695cbc4955c4c8fe0a6540f73556
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 -  yyAdngIYZpP
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A178 
' 0018     20 LABEL : Cell Value, String Constant - EtafN len=0 
' 0018     24 LABEL : Cell Value, String Constant - EwoKafUWG len=0 
' 0018     21 LABEL : Cell Value, String Constant - EXtVKX len=0 
' 0018     26 LABEL : Cell Value, String Constant - FsaZnpNcBYE len=0 
' 0018     22 LABEL : Cell Value, String Constant - Hzqnhcv len=0 
' 0018     21 LABEL : Cell Value, String Constant - KJIfBG len=0 
' 0018     21 LABEL : Cell Value, String Constant - mNqNhV len=0 
' 0018     22 LABEL : Cell Value, String Constant - NVXMlRw len=0 
' 0018     20 LABEL : Cell Value, String Constant - oPKxS len=0 
' 0018     24 LABEL : Cell Value, String Constant - pKuDPaZNw len=0 
' 0018     27 LABEL : Cell Value, String Constant - PpkUZaZhGliO len=0 
' 0018     24 LABEL : Cell Value, String Constant - QbUPpHIst len=0 
' 0018     23 LABEL : Cell Value, String Constant - QWZmAwxm len=0 
' 0018     23 LABEL : Cell Value, String Constant - rrySRikA len=0 
' 0018     26 LABEL : Cell Value, String Constant - rXVXrUmAGQg len=0 
' 0018     27 LABEL : Cell Value, String Constant - WwWiPoHDyrao len=0 
' 0018     23 LABEL : Cell Value, String Constant - XVtfLJFN len=0 
' 0018     25 LABEL : Cell Value, String Constant - YdcuFwSEuH len=0 
' 0018     27 LABEL : Cell Value, String Constant - zaqkMbpQkjsQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZgKjjtsfyTK 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
' 0
... (truncated)

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