Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fa0470a32a433029…

MALICIOUS

Office (OLE)

37.0 KB Created: 2020-11-27 11:44:53 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 3f891c2e62814f5eec2f1595099098d3 SHA-1: 4a540b86689d90029e20885a43ac31d4bba56889 SHA-256: fa0470a32a4330296ef896f3813f25e4b7d36bcfed0e4fcd891f02b62df8f837
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 macros, specifically an Auto_Open entry. This indicates an attempt to automatically execute code upon opening. The presence of dangerous formula APIs further suggests malicious intent, likely to download and execute a secondary 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) 6937 bytes
SHA-256: 353e4d380cd50055471469b2206830309b3e11626a7ee5cbee73a81e00a3c80a
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  hXdMJRET
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I173 
' 0018     27 LABEL : Cell Value, String Constant - BRIQKEVZoPPc len=0 
' 0018     24 LABEL : Cell Value, String Constant - cPGECKeEz len=0 
' 0018     25 LABEL : Cell Value, String Constant - DhFuXLSiKi len=0 
' 0018     27 LABEL : Cell Value, String Constant - dNzVDCOlBSUd len=0 
' 0018     25 LABEL : Cell Value, String Constant - FAiEwnEOru len=0 
' 0018     26 LABEL : Cell Value, String Constant - gWIkTOYqmUS len=0 
' 0018     21 LABEL : Cell Value, String Constant - InpPOQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - jKpTqkcXkgH len=0 
' 0018     27 LABEL : Cell Value, String Constant - ObbdLAnGVYFx len=0 
' 0018     20 LABEL : Cell Value, String Constant - OJyLj len=0 
' 0018     23 LABEL : Cell Value, String Constant - PTTmminw len=0 
' 0018     22 LABEL : Cell Value, String Constant - qFmtaZb len=0 
' 0018     21 LABEL : Cell Value, String Constant - QGjsst len=0 
' 0018     27 LABEL : Cell Value, String Constant - wMeHYpmGrWJO len=0 
' 0018     27 LABEL : Cell Value, String Constant - WRKALrcygZqq len=0 
' 0018     25 LABEL : Cell Value, String Constant - xgtkferwCF len=0 
' 0018     25 LABEL : Cell Value, String Constant - xojaWshrhW len=0 
' 0018     24 LABEL : Cell Value, String Constant - zOnETxNRq len=0 
' 0018     24 LABEL : Cell Value, String Constant - zPpIWQeUD len=0 
' 0018     24 LABEL : Cell Value, String Constant - zRKrjpZES 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 Co
... (truncated)

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