Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 764adf1e72731f1c…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:46:34 Authoring application: Microsoft Excel First seen: 2021-05-22
MD5: cbbc9fec77a63893ef9f95c75360627b SHA-1: df2904bdd662b0658a63b553ead17a790015d917 SHA-256: 764adf1e72731f1ca6b5698ca1e3af5f8187a2e13784255c2d661ef8556c973a
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 (XLM) macros. The critical heuristics indicate the presence of an Auto_Open defined name, which is a common technique for automatically executing malicious code when the workbook is opened. The macros likely attempt to download and execute a second-stage payload, though the specific URLs or commands are not directly visible in the provided evidence.

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) 6581 bytes
SHA-256: 230b818e9e5c5d2cd295414ccc1882de8a837d673ba0d6dcce72979aa904e8e7
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 -  LbDbuAw
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F162 
' 0018     21 LABEL : Cell Value, String Constant - CamNZP len=0 
' 0018     20 LABEL : Cell Value, String Constant - cZqvz len=0 
' 0018     27 LABEL : Cell Value, String Constant - DlibEYRLotne len=0 
' 0018     25 LABEL : Cell Value, String Constant - dQFhhRCsYO len=0 
' 0018     26 LABEL : Cell Value, String Constant - EYldUIjUBBr len=0 
' 0018     21 LABEL : Cell Value, String Constant - FhduHS len=0 
' 0018     27 LABEL : Cell Value, String Constant - FkfZefMJGYwM len=0 
' 0018     25 LABEL : Cell Value, String Constant - HMZfASLrvN len=0 
' 0018     20 LABEL : Cell Value, String Constant - HruTG len=0 
' 0018     27 LABEL : Cell Value, String Constant - KsiqqtVsZipq len=0 
' 0018     24 LABEL : Cell Value, String Constant - RjRISAyvd len=0 
' 0018     24 LABEL : Cell Value, String Constant - vQkgZUNTa len=0 
' 0018     25 LABEL : Cell Value, String Constant - vRhlDZWkDW len=0 
' 0018     23 LABEL : Cell Value, String Constant - vvXXPAsU len=0 
' 0018     27 LABEL : Cell Value, String Constant - XPiWjfrVeiib len=0 
' 0018     24 LABEL : Cell Value, String Constant - xPOejyyCm len=0 
' 0018     20 LABEL : Cell Value, String Constant - yhsfY len=0 
' 0018     22 LABEL : Cell Value, String Constant - YiDOiKV len=0 
' 0018     24 LABEL : Cell Value, String Constant - YkEQDdvTD len=0 
' 0018     20 LABEL : Cell Value, String Constant - zuPpy 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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