Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ff03bf931f276ef2…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:28:04 Authoring application: Microsoft Excel First seen: 2021-09-23
MD5: 401b000d5cd511b42f13ba64c5edca99 SHA-1: 164dc7d9e68f1ef5bc2a12c73f3fe485bec28c2f SHA-256: ff03bf931f276ef21c8b467a6dad558d003cec6a0e23dcb5580c78df972028eb
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 sheet that contains an Auto_Open entry, which is a critical finding indicating automatic execution upon opening. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute commands. No document body text was available for further context, but the macro's nature points to a direct execution attack.

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) 6662 bytes
SHA-256: 59b059a1d70ab7fd887fe35c480d612e6736cf6344ee03f881883f89e722b9ea
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 -  eepCDzmv
' 0018     22 LABEL : Cell Value, String Constant - AEmrZNq len=0 
' 0018     21 LABEL : Cell Value, String Constant - AqTIck len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A180 
' 0018     24 LABEL : Cell Value, String Constant - BkdAlLCQm len=0 
' 0018     23 LABEL : Cell Value, String Constant - csxxvrvh len=0 
' 0018     25 LABEL : Cell Value, String Constant - EMcvJaOmZw len=0 
' 0018     26 LABEL : Cell Value, String Constant - fBNYpmBJrif len=0 
' 0018     21 LABEL : Cell Value, String Constant - fPrJSp len=0 
' 0018     22 LABEL : Cell Value, String Constant - HcrYPDW len=0 
' 0018     22 LABEL : Cell Value, String Constant - kMCclWz len=0 
' 0018     25 LABEL : Cell Value, String Constant - nkAskquPdf len=0 
' 0018     26 LABEL : Cell Value, String Constant - NTJxtpvLCDJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - oHmWySqHJB len=0 
' 0018     27 LABEL : Cell Value, String Constant - PCDEAXWjfYve len=0 
' 0018     27 LABEL : Cell Value, String Constant - PlxGcjTxvsKx len=0 
' 0018     23 LABEL : Cell Value, String Constant - qvhBONhM len=0 
' 0018     21 LABEL : Cell Value, String Constant - sPTTqg len=0 
' 0018     20 LABEL : Cell Value, String Constant - WJlCZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - wQqqaM len=0 
' 0018     21 LABEL : Cell Value, String Constant - XZoIhr len=0 
' 0018     26 LABEL : Cell Value, String Constant - xzUBnMyuSNm 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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