Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 383d6d97201a34f4…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:41:25 Authoring application: Microsoft Excel First seen: 2021-10-12
MD5: be667c922cec45e8757683fa58b6c4e3 SHA-1: a49812ecd27d8d31682f82d93db3df45e9bad8fd SHA-256: 383d6d97201a34f4d4e0fa1b463d81497f3075fb35c917603a19120ca54e0f8a
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. Heuristics indicate the presence of an Auto_Open macro that uses dangerous formula APIs, specifically 'RUN'. This suggests the macro is designed to execute arbitrary commands, likely to download and run a second-stage payload. 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) 6500 bytes
SHA-256: dac0b1a931dfbbbd4b1ab6ec1cd95dd4fa81e71b6801cfac87c1c18bfd0e50c6
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  SzU
' 0018     22 LABEL : Cell Value, String Constant - AGEZcJV len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F151 
' 0018     26 LABEL : Cell Value, String Constant - AYnHpVakqNN len=0 
' 0018     23 LABEL : Cell Value, String Constant - BDDVPxGO len=0 
' 0018     21 LABEL : Cell Value, String Constant - BZVtGU len=0 
' 0018     24 LABEL : Cell Value, String Constant - EmPXoSAVr len=0 
' 0018     27 LABEL : Cell Value, String Constant - eRWwRfehnMbY len=0 
' 0018     20 LABEL : Cell Value, String Constant - HNRoR len=0 
' 0018     25 LABEL : Cell Value, String Constant - HOVnoKzavg len=0 
' 0018     23 LABEL : Cell Value, String Constant - JNMFhAjy len=0 
' 0018     21 LABEL : Cell Value, String Constant - jtNhue len=0 
' 0018     24 LABEL : Cell Value, String Constant - LUbIngcts len=0 
' 0018     23 LABEL : Cell Value, String Constant - lYmIJpqX len=0 
' 0018     25 LABEL : Cell Value, String Constant - mnyVeSYIzb len=0 
' 0018     20 LABEL : Cell Value, String Constant - NFgAe len=0 
' 0018     24 LABEL : Cell Value, String Constant - pFdCYJTff len=0 
' 0018     21 LABEL : Cell Value, String Constant - tBMPdN len=0 
' 0018     21 LABEL : Cell Value, String Constant - tkzGDj len=0 
' 0018     24 LABEL : Cell Value, String Constant - uBQFobBjv len=0 
' 0018     22 LABEL : Cell Value, String Constant - viItJIX len=0 
' 0018     21 LABEL : Cell Value, String Constant - WeGuOA 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     10 LABELSST : C
... (truncated)

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