Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4a846e7ad57fc8ad…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:38:47 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: 292c1c67d3b97288ed75eb9f8d7fb3e5 SHA-1: e84100c5eea367789657f398714ab913ee250143 SHA-256: 4a846e7ad57fc8adbebbbeda88200cf6292586bdc8a038ac71a481862335cb04
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. Static analysis detected an Auto_Open defined name, indicating that a macro will execute automatically upon opening the workbook. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code, likely downloading and running a second-stage 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) 6493 bytes
SHA-256: 4119973a3bd5cddf0f24f315c5c2115ece2b145d8e76dcfdd4f488008a732e3c
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 -  cvsLrDd
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A153 
' 0018     24 LABEL : Cell Value, String Constant - BWGdkVtYw len=0 
' 0018     24 LABEL : Cell Value, String Constant - cAdJqNTlY len=0 
' 0018     24 LABEL : Cell Value, String Constant - EdYayOdBP len=0 
' 0018     23 LABEL : Cell Value, String Constant - EVBBjssG len=0 
' 0018     24 LABEL : Cell Value, String Constant - FLEZtzsEK len=0 
' 0018     21 LABEL : Cell Value, String Constant - FpFwYJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - jCEMosmK len=0 
' 0018     20 LABEL : Cell Value, String Constant - JcfHz len=0 
' 0018     21 LABEL : Cell Value, String Constant - kBdmqa len=0 
' 0018     26 LABEL : Cell Value, String Constant - mRDaYRfbJOW len=0 
' 0018     23 LABEL : Cell Value, String Constant - nhqiLdih len=0 
' 0018     22 LABEL : Cell Value, String Constant - omaYeJJ len=0 
' 0018     22 LABEL : Cell Value, String Constant - orARFrj len=0 
' 0018     26 LABEL : Cell Value, String Constant - PMqHPcOrXIq len=0 
' 0018     26 LABEL : Cell Value, String Constant - PVmhDNwRyPu len=0 
' 0018     26 LABEL : Cell Value, String Constant - pyPlZXkYAsm len=0 
' 0018     27 LABEL : Cell Value, String Constant - QgfoTZZZEpEw len=0 
' 0018     22 LABEL : Cell Value, String Constant - rDGGuya len=0 
' 0018     21 LABEL : Cell Value, String Constant - vybGCR len=0 
' 0018     21 LABEL : Cell Value, String Constant - xZWZlI 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
... (truncated)

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