Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7be342ff3733220b…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:38:32 Authoring application: Microsoft Excel First seen: 2021-10-05
MD5: de8058ecc106ffaeaace6b91aa08e2e1 SHA-1: df83af7e7986748cd1d3fc43a7854c743920e1fb SHA-256: 7be342ff3733220beac9b11afca1b163b7817822d0c89bbf5da35b75da2dd447
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a known method for executing malicious code upon opening the workbook. The presence of dangerous formula APIs like RUN further indicates malicious intent. The macro sheet itself contains obfuscated data, suggesting it's designed to hide its true functionality.

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) 6751 bytes
SHA-256: 8a240380e67e4a028837284dbd0f02f3e79a92772dffdcb63418f9bbbc61de27
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  qxLREyrNn
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H146 
' 0018     20 LABEL : Cell Value, String Constant - BlygE len=0 
' 0018     27 LABEL : Cell Value, String Constant - dzGexMeAifMY len=0 
' 0018     27 LABEL : Cell Value, String Constant - DzHVWuKENjJD len=0 
' 0018     20 LABEL : Cell Value, String Constant - eoUDf len=0 
' 0018     21 LABEL : Cell Value, String Constant - fMlewk len=0 
' 0018     23 LABEL : Cell Value, String Constant - hgbIGDNj len=0 
' 0018     20 LABEL : Cell Value, String Constant - hUeJr len=0 
' 0018     25 LABEL : Cell Value, String Constant - jNhtBuFOoz len=0 
' 0018     22 LABEL : Cell Value, String Constant - JshsSEu len=0 
' 0018     23 LABEL : Cell Value, String Constant - kAiOzMYr len=0 
' 0018     27 LABEL : Cell Value, String Constant - KBsdjdLAfQgl len=0 
' 0018     27 LABEL : Cell Value, String Constant - NGaHOGWrvcGb len=0 
' 0018     20 LABEL : Cell Value, String Constant - OkOum len=0 
' 0018     22 LABEL : Cell Value, String Constant - otiahce len=0 
' 0018     21 LABEL : Cell Value, String Constant - ToKfNa len=0 
' 0018     22 LABEL : Cell Value, String Constant - uwOoQzY len=0 
' 0018     24 LABEL : Cell Value, String Constant - VOiNHtUuj len=0 
' 0018     26 LABEL : Cell Value, String Constant - xZnSnuPHkbZ len=0 
' 0018     24 LABEL : Cell Value, String Constant - YLKPomDcO len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZMpWw 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 LA
... (truncated)

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