Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 546151018cbed0de…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:44:40 Authoring application: Microsoft Excel First seen: 2021-09-18
MD5: 5c5d3786e67ed466b829e321ce54dbaf SHA-1: 7f1b96ab6d34af7d85d8417cdbf4dd76bf5fa75a SHA-256: 546151018cbed0de9938e939fbf6fba73d48d901bec66dbecbba2a8eaa89a1ec
140 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open defined name, suggesting an attempt to automatically execute code upon opening the document. The 'RUN=0' formula API in the heuristics further points to a direct execution of a command or function, likely for initial execution of a 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) 6714 bytes
SHA-256: 0ba69fadd0e060b8eda537cf1eab27ca83c60aa63dc631c9944ebef438030bb0
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 -  pbLVgbzo
' 0018     24 LABEL : Cell Value, String Constant - aqBNaAqwH len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F129 
' 0018     25 LABEL : Cell Value, String Constant - BtRICPpKfk len=0 
' 0018     20 LABEL : Cell Value, String Constant - cSJiA len=0 
' 0018     20 LABEL : Cell Value, String Constant - DJrgJ len=0 
' 0018     26 LABEL : Cell Value, String Constant - eqhGEcdjwYz len=0 
' 0018     25 LABEL : Cell Value, String Constant - EUglNAYSLX len=0 
' 0018     24 LABEL : Cell Value, String Constant - GdgpknGZW len=0 
' 0018     24 LABEL : Cell Value, String Constant - hZyDebFnZ len=0 
' 0018     24 LABEL : Cell Value, String Constant - nEBWXrisp len=0 
' 0018     24 LABEL : Cell Value, String Constant - nMjJTBQUo len=0 
' 0018     27 LABEL : Cell Value, String Constant - ORBIfYVJWPSn len=0 
' 0018     23 LABEL : Cell Value, String Constant - QSqULmae len=0 
' 0018     20 LABEL : Cell Value, String Constant - smcMj len=0 
' 0018     23 LABEL : Cell Value, String Constant - SnUUaWzm len=0 
' 0018     22 LABEL : Cell Value, String Constant - sQaQpGV len=0 
' 0018     23 LABEL : Cell Value, String Constant - SuvzmTxM len=0 
' 0018     20 LABEL : Cell Value, String Constant - UqbEQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - vwbUWave len=0 
' 0018     22 LABEL : Cell Value, String Constant - XsfDObl len=0 
' 0018     20 LABEL : Cell Value, String Constant - ystGw 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 LABEL
... (truncated)

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