Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2a26df43ed419150…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:34:50 Authoring application: Microsoft Excel First seen: 2021-10-23
MD5: c68cff5bdf5b81f2a120fd68801a2d80 SHA-1: 8ae2a0e8d96fec01f2d17048aeaf8175238e78a4 SHA-256: 2a26df43ed419150b5870876a022431db81567864ead8ff3de69561d3e98e838
140 Risk Score

Malware Insights

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

The file is an Excel document containing Excel 4.0 (XLM) macros, specifically an Auto_Open defined name. This indicates the macro will execute automatically when the workbook is opened. 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. No specific IOCs like URLs or hashes were extracted from the macro content itself.

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) 6655 bytes
SHA-256: 2915689a30dc171ba7e32855c0d7ce758096cb7a662d6912e03a701fbe053ed2
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  uNkwPrCZDV
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I142 
' 0018     22 LABEL : Cell Value, String Constant - bHoNssM len=0 
' 0018     26 LABEL : Cell Value, String Constant - CcZzOKnHJRd len=0 
' 0018     22 LABEL : Cell Value, String Constant - cqfHvNu len=0 
' 0018     25 LABEL : Cell Value, String Constant - cvzyFbtdhX len=0 
' 0018     23 LABEL : Cell Value, String Constant - CZKfAUvM len=0 
' 0018     27 LABEL : Cell Value, String Constant - DBTBvDXBFYwd len=0 
' 0018     24 LABEL : Cell Value, String Constant - FDCMkGpQi len=0 
' 0018     25 LABEL : Cell Value, String Constant - FtuaIxNRJg len=0 
' 0018     25 LABEL : Cell Value, String Constant - IUarXyNnRi len=0 
' 0018     22 LABEL : Cell Value, String Constant - JsrRBwC len=0 
' 0018     26 LABEL : Cell Value, String Constant - LMkEuDVVFUN len=0 
' 0018     27 LABEL : Cell Value, String Constant - MNKwTVcxHRej len=0 
' 0018     24 LABEL : Cell Value, String Constant - MYqJewNyr len=0 
' 0018     20 LABEL : Cell Value, String Constant - NlPNI len=0 
' 0018     25 LABEL : Cell Value, String Constant - qPpkvifQFQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - QvVMloqp len=0 
' 0018     22 LABEL : Cell Value, String Constant - rAPqfoN len=0 
' 0018     21 LABEL : Cell Value, String Constant - RfDRLn len=0 
' 0018     27 LABEL : Cell Value, String Constant - wXAIMXEQpkFs len=0 
' 0018     27 LABEL : Cell Value, String Constant - yzMnrKQvcoKR 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 Constan
... (truncated)

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